(57 days)
Not Found
Yes
The document explicitly states that the device uses an "artificial intelligence algorithm".
No
The device is described as a "radiological computer-aided triage and notification software" intended to assist in workflow triage by flagging and communicating suspected positive cases. It explicitly states, "The device does not alter the original medical image and is not intended to be used as a diagnostic device," and its results are "intended to be used in conjunction with other patient information...to assist with triage/prioritization of medical images." It does not directly provide therapy or affect a patient's condition.
No
The "Intended Use / Indications for Use" section explicitly states, "The device does not alter the original medical image and is not intended to be used as a diagnostic device."
Yes
The device description explicitly states "BriefCase is a radiological computer-assisted triage and notification software device" and details its software components and modules. There is no mention of accompanying hardware that is part of the device itself.
No, this device is not an IVD (In Vitro Diagnostic).
Here's why:
- Intended Use: The intended use clearly states that BriefCase is a "radiological computer-aided triage and notification software." Its purpose is to assist in workflow triage by flagging suspected cases and communicating notifications. It explicitly states it is "not intended to be used as a diagnostic device."
- Mechanism: The device analyzes medical images (CT scans) to identify potential findings. This is image analysis, not a test performed on biological specimens (like blood, urine, or tissue) which is the hallmark of an in vitro diagnostic.
- Output: The output is a notification and a preview image for informational purposes, not a diagnostic result or measurement derived from a biological sample.
- Regulatory Definition of IVD: In vitro diagnostics are defined as reagents, instruments, and systems intended for use in the diagnosis of disease or other conditions, including a determination of the state of health, in order to cure, mitigate, treat, or prevent disease or its sequelae. This is done by examining specimens derived from the human body. BriefCase does not fit this definition.
BriefCase falls under the category of medical image analysis software, specifically designed for workflow prioritization and triage, not for performing diagnostic tests on biological samples.
No
The letter does not explicitly state that the FDA has reviewed and approved or cleared a PCCP for this specific device. The section "Control Plan Authorized (PCCP) and relevant text" indicates "Not Found".
Intended Use / Indications for Use
BriefCase is a radiological computer-aided triage and notification software indicated for use in the analysis of CT exams with contrast (CTA and CT with contrast) that include the chest in adults or transitional adolescents aged 18 and older. The device is intended to assist hospital networks and appropriately trained medical specialists in workflow triage by flagging and communicating suspected positive cases of aortic dissection (AD) pathology.
BriefCase uses an artificial intelligence algorithm to analyze images and highlight cases with detected findings on a standalone application in parallel to the ongoing standard of care image interpretation. The user is presented with notifications for cases with suspected findings. Notifications include compressed preview images that are meant for informational purposes only and not intended for diagnostic use beyond notification. The device does not alter the original medical image and is not intended to be used as a diagnostic device.
The results of BriefCase are intended to be used in conjunction with other patient information and based on the user's professional judgment, to assist with triage/prioritization of medical images. Notified clinicians are responsible for viewing full images per the standard of care.
Product codes (comma separated list FDA assigned to the subject device)
QAS
Device Description
BriefCase is a radiological computer-assisted triage and notification software device. The software system is based on an algorithm programmed component and consists of a standard off-the-shelf operating system, the Microsoft Windows server 2012 64bit, and additional applications, which include PostgreSQL, DICOM module and the BriefCase Image Processing Application. The device consists of the following three modules: (1) Aidoc Hospital Server (AHS/Orchestrator) for image acquisition; (2) Aidoc Cloud Server (ACS) for image processing; and (3) Aidoc Desktop Application for workflow integration.
DICOM images are received, saved, filtered and de-identified before processing. Filtration matches metadata fields with keywords. Series are processed chronologically by running the algorithms on each series to detect suspected cases. The software then flags suspect cases by sending notifications to the desktop application, thereby facilitating triage and prioritization by the user. As the BriefCase software platform harbors several triage algorithms, the user may opt to filter out notifications by pathology, e.g., a chest radiologist may choose to filter out alerts on ICH cases, and a neuro-radiologist would opt to divert AD alerts. Where several medical centers are linked to a shared PACS, a user may read cases for a certain center but not for another, and thus may opt to filter out alerts by center. Activating the filter does not impact the order in which notifications are presented in the Aidoc desktop application.
The desktop application feed displays all incoming suspect cases, each notified case in a line. Hovering over a line in the feed pops up a compressed, low-quality, grayscale, unannotated image that is captioned "not for diagnostic use" and is displayed as a preview function. This compressed preview is meant for informational purposes only, does not contain any marking of the findings, and is not intended for primary diagnosis beyond notification.
Mentions image processing
Yes
Mentions AI, DNN, or ML
Yes
Input Imaging Modality
CT exams with contrast (CTA and CT with contrast)
Anatomical Site
Chest
Indicated Patient Age Range
Adults or transitional adolescents aged 18 and older.
Intended User / Care Setting
Hospital networks and appropriately trained medical specialists
Description of the training set, sample size, data source, and annotation protocol
Not Found
Description of the test set, sample size, data source, and annotation protocol
The cases were collected from 5 medical centers in the US and are distinct datasets from the ones used to train the algorithm.
Summary of Performance Studies (study type, sample size, AUC, MRMC, standalone performance, key results)
Aidoc conducted a retrospective, blinded, multicenter, study with the BriefCase software to evaluate the software's performance in identifying aortic dissection in CT images in 499 cases.
Primary endpoints were 80% performance goals for both sensitivity and specificity.
Secondary endpoints were BriefCase time-to-notification compared to the predicate device. Positive Predictive Value (PPV), Negative Predictive Value (NPV), Positive Likelihood Ratio (PLR), and Negative Likelihood Ratio (NLR) were also assessed.
Sensitivity and specificity exceeded the 80% performance goal. Sensitivity was 93.23% (95% CI: 88.70% - 96.35%) and specificity was 92.83% (95% CI: 89.35% - 95.45%).
The BriefCase mean time-to-notification for aortic dissection was 38 seconds (95% CI: 35.5-40.4). The time-to-notification for the CINA CHEST for AD triage was 36.5 seconds (95% CI: 35.4-37.5).
AOP1: Sensitivity was 96.88% (95% C1: 93.32% - 98.84%) and specificity was 85.02% (95% C1: 80.52% - 88.82%).
AOP2: Sensitivity was 86.46% (95% Cl: 80.79% - 90.96%) and specificity was 95.11% (95% Cl: 92.07% - 97.24%).
Key Metrics (Sensitivity, Specificity, PPV, NPV, etc.)
Sensitivity: 93.23% (95% CI: 88.70% - 96.35%)
Specificity: 92.83% (95% CI: 89.35% - 95.45%)
NPV: 99.8% (95% Cl: 99.7%- 99.9%)
PPV: 25.0% (95% Cl: 18.2%- 19.5%)
PLR: 13.010 (95% Cl: 8.682 - 19.494)
NLR: 0.073 (95% Cl: 0.043 - 0.123)
Time-to-notification: 38 seconds (95% CI: 35.5-40.4)
Predicate Device(s): If the device was cleared using the 510(k) pathway, identify the Predicate Device(s) K/DEN number used to claim substantial equivalence and list them here in a comma separated list exactly as they appear in the text. List the primary predicate first in the list.
Reference Device(s): Identify the Reference Device(s) K/DEN number and list them here in a comma separated list exactly as they appear in the text.
Not Found
Predetermined Change Control Plan (PCCP) - All Relevant Information for the subject device only (e.g. presence / absence, what scope was granted / cleared under the PCCP, any restrictions, etc).
Not Found
§ 892.2080 Radiological computer aided triage and notification software.
(a)
Identification. Radiological computer aided triage and notification software is an image processing prescription device intended to aid in prioritization and triage of radiological medical images. The device notifies a designated list of clinicians of the availability of time sensitive radiological medical images for review based on computer aided image analysis of those images performed by the device. The device does not mark, highlight, or direct users' attention to a specific location in the original image. The device does not remove cases from a reading queue. The device operates in parallel with the standard of care, which remains the default option for all cases.(b)
Classification. Class II (special controls). The special controls for this device are:(1) Design verification and validation must include:
(i) A detailed description of the notification and triage algorithms and all underlying image analysis algorithms including, but not limited to, a detailed description of the algorithm inputs and outputs, each major component or block, how the algorithm affects or relates to clinical practice or patient care, and any algorithm limitations.
(ii) A detailed description of pre-specified performance testing protocols and dataset(s) used to assess whether the device will provide effective triage (
e.g., improved time to review of prioritized images for pre-specified clinicians).(iii) Results from performance testing that demonstrate that the device will provide effective triage. The performance assessment must be based on an appropriate measure to estimate the clinical effectiveness. The test dataset must contain sufficient numbers of cases from important cohorts (
e.g., subsets defined by clinically relevant confounders, effect modifiers, associated diseases, and subsets defined by image acquisition characteristics) such that the performance estimates and confidence intervals for these individual subsets can be characterized with the device for the intended use population and imaging equipment.(iv) Stand-alone performance testing protocols and results of the device.
(v) Appropriate software documentation (
e.g., device hazard analysis; software requirements specification document; software design specification document; traceability analysis; description of verification and validation activities including system level test protocol, pass/fail criteria, and results).(2) Labeling must include the following:
(i) A detailed description of the patient population for which the device is indicated for use;
(ii) A detailed description of the intended user and user training that addresses appropriate use protocols for the device;
(iii) Discussion of warnings, precautions, and limitations must include situations in which the device may fail or may not operate at its expected performance level (
e.g., poor image quality for certain subpopulations), as applicable;(iv) A detailed description of compatible imaging hardware, imaging protocols, and requirements for input images;
(v) Device operating instructions; and
(vi) A detailed summary of the performance testing, including: test methods, dataset characteristics, triage effectiveness (
e.g., improved time to review of prioritized images for pre-specified clinicians), diagnostic accuracy of algorithms informing triage decision, and results with associated statistical uncertainty (e.g., confidence intervals), including a summary of subanalyses on case distributions stratified by relevant confounders, such as lesion and organ characteristics, disease stages, and imaging equipment.
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Image /page/0/Picture/0 description: The image shows the logo of the U.S. Food and Drug Administration (FDA). On the left is the Department of Health & Human Services logo. To the right of that is the FDA logo in blue, with the words "U.S. FOOD & DRUG ADMINISTRATION" in blue as well. The FDA is a federal agency responsible for regulating and supervising the safety of food, drugs, and other products.
Aidoc Medical, Ltd. % John J. Smith Partner Hogan Lovells US LLP 555 Thirteenth Street WASHINGTON DC 20004
Re: K222329
September 28, 2022
Trade/Device Name: BriefCase Regulation Number: 21 CFR 892.2080 Regulation Name: Radiological computer aided triage and notification software Regulatory Class: Class II Product Code: QAS Dated: August 2, 2022 Received: August 2, 2022
Dear John J. Smith:
We have reviewed your Section 510(k) premarket notification of intent to market the device referenced above and have determined the device is substantially equivalent (for the indications for use stated in the enclosure) to legally marketed predicate devices marketed in interstate commerce prior to May 28, 1976, the enactment date of the Medical Device Amendments, or to devices that have been reclassified in accordance with the provisions of the Federal Food, Drug, and Cosmetic Act (Act) that do not require approval of a premarket approval application (PMA). You may, therefore, market the device, subject to the general controls provisions of the Act. Although this letter refers to your product as a device, please be aware that some cleared products may instead be combination products. The 510(k) Premarket Notification Database located at https://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfpmn/pmn.cfm identifies combination product submissions. The general controls provisions of the Act include requirements for annual registration, listing of devices, good manufacturing practice, labeling, and prohibitions against misbranding and adulteration. Please note: CDRH does not evaluate information related to contract liability warranties. We remind you, however, that device labeling must be truthful and not misleading.
If your device is classified (see above) into either class II (Special Controls) or class III (PMA), it may be subject to additional controls. Existing major regulations affecting your device can be found in the Code of Federal Regulations, Title 21, Parts 800 to 898. In addition, FDA may publish further announcements concerning your device in the Federal Register.
Please be advised that FDA's issuance of a substantial equivalence determination does not mean that FDA has made a determination that your device complies with other requirements of the Act or any Federal statutes and regulations administered by other Federal agencies. You must comply with all the Act's requirements, including, but not limited to: registration and listing (21 CFR Part 807); labeling (21 CFR Part 801); medical device reporting of medical device-related adverse events) (21 CFR 803) for
1
devices or postmarketing safety reporting (21 CFR 4, Subpart B) for combination products (see https://www.fda.gov/combination-products/guidance-regulatory-information/postmarketing-safety-reportingcombination-products); good manufacturing practice requirements as set forth in the quality systems (QS) regulation (21 CFR Part 820) for devices or current good manufacturing practices (21 CFR 4, Subpart A) for combination products; and, if applicable, the electronic product radiation control provisions (Sections 531-542 of the Act); 21 CFR 1000-1050.
Also, please note the regulation entitled, "Misbranding by reference to premarket notification" (21 CFR Part 807.97). For questions regarding the reporting of adverse events under the MDR regulation (21 CFR Part 803), please go to https://www.fda.gov/medical-device-safety/medical-device-reportingmdr-how-report-medical-device-problems.
For comprehensive regulatory information about medical devices and radiation-emitting products, including information about labeling regulations, please see Device Advice (https://www.fda.gov/medicaldevices/device-advice-comprehensive-regulatory-assistance) and CDRH Learn (https://www.fda.gov/training-and-continuing-education/cdrh-learn). Additionally, you may contact the Division of Industry and Consumer Education (DICE) to ask a question about a specific regulatory topic. See the DICE website (https://www.fda.gov/medical-device-advice-comprehensive-regulatoryassistance/contact-us-division-industry-and-consumer-education-dice) for more information or contact DICE by email (DICE@fda.hhs.gov) or phone (1-800-638-2041 or 301-796-7100).
Sincerely,
Jessica Lamb, Ph.D.
Assistant Director Imaging Software Team DHT8B: Division of Radiological Imaging Devices and Electronic Products OHT8: Office of Radiological Health Office of Product Evaluation and Quality Center for Devices and Radiological Health
Enclosure
2
Indications for Use
510(k) Number (if known) K222329
Device Name
BriefCase
Indications for Use (Describe)
BriefCase is a radiological computer-aided triage and notification software indicated for use in the analysis of CT exams with contrast (CTA and CT with contrast) that include the chest in adults or transitional adolescents aged 18 and older. The device is intended to assist hospital networks and appropriately trained medical specialists in workflow triage by flagging and communicating suspected positive cases of aortic dissection (AD) pathology.
BriefCase uses an artificial intelligence algorithm to analyze images and highlight cases with detected findings on a standalone application in parallel to the ongoing standard of care image interpretation. The user is presented with notifications for cases with suspected findings. Notifications include compressed preview images that are meant for informational purposes only and not intended for diagnostic use beyond notification. The device does not alter the original medical image and is not intended to be used as a diagnostic device.
The results of BriefCase are intended to be used in conjunction with other patient information and based on the user's professional judgment, to assist with triage/prioritization of medical images. Notified clinicians are responsible for viewing full images per the standard of care.
| Type of Use (Select one or both, as applicable) | |||
|---|---|---|---|
| ✘ Prescription Use (Part 21 CFR 801 Subpart D)□ Over-The-Counter Use (21 CFR 801 Subpart C) | ✘ Prescription Use (Part 21 CFR 801 Subpart D) | □ Over-The-Counter Use (21 CFR 801 Subpart C) | |
| ✘ Prescription Use (Part 21 CFR 801 Subpart D) | □ Over-The-Counter Use (21 CFR 801 Subpart C) |
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3
510(k) Summary Aidoc Medical, Ltd.'s BriefCase
Submitter:
| Aidoc Medical, Ltd.
3 Aminadav St.
Tel-Aviv, Israel
| Phone: | +972-73-7946870 |
|---|---|
| Contact Person: | Amalia Schreier, LL.M. |
| Date Prepared: | August 2, 2022 |
| Name of Device: | BriefCase |
| Classification Name: | Radiological computer-assisted triage and notification software |
| device | |
| Regulatory Class: | Class II |
| Product Code: | QAS (21 C.F.R. 892.2080) |
| Primary Predicate Device: | CINA CHEST (K210237) |
Device Description
BriefCase is a radiological computer-assisted triage and notification software device. The software system is based on an algorithm programmed component and consists of a standard off-the-shelf operating system, the Microsoft Windows server 2012 64bit, and additional applications, which include PostgreSQL, DICOM module and the BriefCase Image Processing Application. The device consists of the following three modules: (1) Aidoc Hospital Server (AHS/Orchestrator) for image acquisition; (2) Aidoc Cloud Server (ACS) for image processing; and (3) Aidoc Desktop Application for workflow integration.
DICOM images are received, saved, filtered and de-identified before processing. Filtration matches metadata fields with keywords. Series are processed chronologically by running the algorithms on each series to detect suspected cases. The software then flags suspect cases by sending notifications to the desktop application, thereby facilitating triage and prioritization by the user. As the BriefCase software platform harbors several triage algorithms, the user may opt to filter out notifications by pathology, e.g., a chest radiologist may choose to filter out alerts on ICH cases, and a neuro-radiologist would opt to divert AD alerts. Where several medical centers are linked to a shared PACS, a user may read cases for a certain center but not for another, and thus may opt to filter out alerts by center. Activating the filter does not impact the order in which notifications are presented in the Aidoc desktop application.
The desktop application feed displays all incoming suspect cases, each notified case in a line. Hovering over a line in the feed pops up a compressed, low-quality, grayscale, unannotated image
that is captioned "not for diagnostic use" and is displayed as a preview function. This compressed preview is meant for informational purposes only, does not contain any marking of the findings, and is not intended for primary diagnosis beyond notification.
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Presenting the users with worklist prioritization facilitates earlier triage by prompting the user to assess the relevant original images in the PACS. Thus, the suspect case receives attention earlier than would have been the case in the standard of care practice alone.
Intended Use / Indications for Use
BriefCase is a radiological computer-aided triage and notification software indicated for use in the analysis of CT exams with contrast (CTA and CT with contrast) that include the chest in adults or transitional adolescents aged 18 and older. The device is intended to assist hospital networks and appropriately trained medical specialists in workflow triage by flagging and communicating suspected positive cases of aortic dissection (AD) pathology.
BriefCase uses an artificial intelligence algorithm to analyze images and highlight cases with detected findings on a standalone application in parallel to the ongoing standard of care image interpretation. The user is presented with notifications for cases with suspected findings. Notifications include compressed preview images that are meant for informational purposes only and not intended for diagnostic use beyond notification. The device does not alter the original medical image and is not intended to be used as a diagnostic device.
The results of BriefCase are intended to be used in conjunction with other patient information and based on the user's professional judgment, to assist with triaqe/prioritization of medical images. Notified clinicians are responsible for viewing full images per the standard of care.
Comparison of Technological Characteristics
The subject BriefCase and primary predicate CINA CHEST triage (K210237) are very similar, as explained below.
Both devices are radiological computer-aided triage and notification software programs. Both devices are artificial intelligence, deep-learning algorithms incorporating software packages for use with DICOM 3.0 compliant scanners, PACS, and radiology workstations. The predicate CINA CHEST evaluates images from CT scanners as does the proposed Briefcase. The predicate and subject devices differ in the fact that the subject device runs also on CT exams with contrast (CTA and CT with contrast) that include the chest. All image types were included in the standalone performance study.
The proposed device for aortic dissection has very similar technology and design as the predicate device, and similar indications for use, i.e., both devices are intended to aid in prioritization and triage of time-critical radiological images. The subject and predicate CINA CHEST devices raise the same types of safety and effectiveness questions, namely, accurate detection of findings within the processed study. It is important to note that, like the predicate, the subject device neither removes cases from the standard of care reading queue nor deprioritizes cases. Both devices operate in parallel with the standard of care, which remains the default option for all cases. A table comparing the key features of the subject and the predicate devices is provided below.
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Table 1. Key Feature Comparison
| | Predicate Device
CINA CHEST (K210237) | Subject Device
Aidoc Briefcase |
|------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Intended Use /
Indications for
Use | CINA CHEST is a radiological
computer aided triage and
notification software indicated for
use in the analysis of Chest and
Thoraco-abdominal CT angiography.
The device is intended to assist
hospital networks and trained
radiologists in workflow triage by
flagging and communicating
suspected positive findings of (1)
Chest CT angiography for
Pulmonary Embolism (PE) and (2)
Chest or Thoraco-abdominal CT
angiography for Aortic Dissection
(AD).
CINA CHEST uses an artificial
intelligence algorithm to analyze
images and highlight cases with
detected PE and AD on a
standalone Web application in
parallel to the ongoing standard of
care image interpretation. The user
is presented with notifications for
cases with suspected PE or AD
findings. Notifications include
compressed preview images that are
meant for informational purposes
only, and are not intended for
diagnostic use beyond notification.
The device does not alter the original
medical image, and it is not intended
to be used as a diagnostic device.
The results of CINA CHEST are
intended to be used in conjunction
with other patient information and
based on professional judgment to
assist with triage/prioritization of
medical images. Notified clinicians
are ultimately responsible for
reviewing full images per the
standard of care. | BriefCase is a radiological computer-
aided triage and notification software
indicated for use in the analysis of CT
exams with contrast (CTA and CT with
contrast) that include the chest in adults
or transitional adolescents aged 18 and
older. The device is intended to assist
hospital networks and appropriately
trained medical specialists in workflow
triage by flagging and communicating
suspected positive cases of aortic
dissection (AD) pathology.
BriefCase uses an artificial intelligence
algorithm to analyze images and
highlight cases with detected findings
on a standalone application in parallel
to the ongoing standard of care image
interpretation. The user is presented
with notifications for cases with
suspected findings. Notifications
include compressed preview images
that are meant for informational
purposes only and not intended for
diagnostic use beyond notification. The
device does not alter the original
medical image and is not intended to be
used as a diagnostic device.
The results of BriefCase are intended to
be used in conjunction with other
patient information and based on the
user's professional judgment, to assist
with triage/prioritization of medical
images. Notified clinicians are
responsible for viewing full images per
the standard of care. |
5
| | Predicate Device
CINA CHEST (K210237) | Subject Device
Aidoc Briefcase |
|-------------------------------|--------------------------------------------|--------------------------------------------------------------------------|
| User population | Hospital networks and trained radiologists | Hospital networks and appropriately trained medical specialists |
| Anatomical region of interest | Chest and thoraco-abdominal | Chest, abdomen and thoraco-abdominal |
| Data acquisition protocol | Chest and Thoraco-abdominal CT angiography | CT exams with contrast (CTA and CT with contrast) that include the chest |
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| Notification-only
(notification
alerts), parallel
| workflow tool | Yes | Yes |
|---|---|---|
| Images | ||
| format | DICOM | DICOM |
| Interference with | ||
| standard | ||
| workflow | No | No |
| Algorithm | Artificial intelligence algorithm with | |
| database of images. | Artificial intelligence algorithm with | |
| database of images. | ||
| Structure | - PE and AD image processing | |
| applications |
-
Compatibility of use with the
CINA Platform reference device
(worklist and Image Viewer) | - AHS module (orchestrator, image
acquisition);
-
ACS module (image processing); -
Aidoc Desktop application for
workflow integration (feed and non-
diagnostic Image Viewer). |
Performance Data
Pivotal Study Summary
Aidoc conducted a retrospective, blinded, multicenter, study with the BriefCase software to evaluate the software's performance in identifying aortic dissection in CT images in 499 cases. The cases were collected from 5 medical centers in the US and are distinct datasets from the ones used to train the algorithm.
Primary endpoints were 80% performance goals for both sensitivity and specificity.
Secondary endpoints were BriefCase time-to-notification compared to the predicate device. Positive Predictive Value (PPV), Negative Predictive Value (NPV), Positive Likelihood Ratio (PLR), and Negative Likelihood Ratio (NLR) were also assessed.
Primary Endpoint
Sensitivity and specificity exceeded the 80% performance goal. Sensitivity was 93.23% (95% CI: 88.70% - 96.35%) and specificity was 92.83% (95% CI: 89.35% - 95.45%).
065
Secondary Endpoint
In addition, the time-to-notification metric observed for the BriefCase software in the 5 medical centers was compared to the equivalent metric of the predicate devices.
- -The BriefCase time-to-notification includes the time to get the DICOM exam, de-identify it, upload it to the cloud, analyze and send a notification on a positive suspect case back to the desktop application.
The BriefCase time-to-notification was measured for all True Positive cases (i.e., identified as positive both by the reviewers as well as the BriefCase device) and is given in Table 2 below. The table also displays the same metric reported for the predicate CINA CHEST.
The time-to-notification results obtained for the subject BriefCase device show comparability with the primary predicate with regard to the standard of care review. The BriefCase mean time-to-notification for aortic dissection was 38 seconds (95% CI: 35.5-40.4). The time-to-notification for the CINA CHEST for AD triage was 36.5 seconds (95% CI: 35.4-37.5).
Table 2. Time-to-Notification Comparison for BriefCase Devices (sec)
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| Time-to-notification | N | Mean
Estimate | 95% Lower
CL | 95% Upper
CL | Median | IQR |
|--------------------------------|-----|------------------|-----------------|-----------------|--------|------|
| BriefCase Aortic
Dissection | 499 | 38 | 35.5 | 40.4 | 31.1 | 32.5 |
| CINA CHEST | 298 | 36.5 | 35.4 | 37.5 | 34.1 | n/a |
NPV was 99.8% (95% Cl: 99.7%- 99.9%) and PPV was 25.0% (95% Cl: 18.2%- 19.5%).
PLR was 13.010 (95% Cl: 8.682 - 19.494) and NLR was 0.073 (95% Cl: 0.043 - 0.123).
Thus, the reported similar time-to-notification data demonstrates that when using the subject BriefCase for AD triage the radiologists may have the same benefit in time saving as with the CINA CHEST triage.
As can be seen in Table 3 the mean age of patients whose scans were reviewed for AD was 60.02 years, with a standard deviation of 17.19 years. Gender distribution was 51.9% male, and 47.9% female (Table 4). Scanner distribution can also be found in Table 5 below.
Table 3. Descriptive Statistics for Age
| Mean | Std | Min | Median | Max | N | |
|---|---|---|---|---|---|---|
| Age (Years) | 60.02 | 17.19 | 18 | 62 | 90 | 499 |
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Table 4. Frequency Distribution of Gender
| Gender | All | |||||
|---|---|---|---|---|---|---|
| Ground Truth | ||||||
| Results | Male | Female | ||||
| N | % | N | % | N | % | |
| Positive | 129 | 25.9 | 63 | 12.6 | 192 | 38.6 |
| Negative | 130 | 26.1 | 176 | 35.3 | 306 | 61.4 |
| All | 239 | 48.0 | 259 | 52.0 | 498* | 100.0 |
- 1 case had gender unknown.
Table 5. Frequency Distribution of Manufacturer
| Manufacturer | N | % |
|---|---|---|
| Siemens | 167 | 33.47% |
| GE | 145 | 29.06% |
| Philips | 103 | 20.64% |
| Canon | 84 | 16.83% |
| Total | 499 | 100% |
In summary, performance validation data, combined with a comparison of the time-to-notification metric with the predicate device establishes the achievement by the subject BriefCase of preemptive triage in the range of several minutes.
Additional Operating Points
8
In addition to the default operating point that was selected to maximize both sensitivity and specificity, two additional operating points (AOP) were selected to maximize specificity or sensitivity while maintaining a lower bound 95% confidence interval of 80% for sensitivity and specificity respectively:
AOP1: Sensitivity was 96.88% (95% C1: 93.32% - 98.84%) and specificity was 85.02% (95% C1: 80.52% - 88.82%). AOP2: Sensitivity was 86.46% (95% Cl: 80.79% - 90.96%) and specificity was 95.11% (95% Cl: 92.07% - 97.24%).
Conclusions
The subject BriefCase for Aortic Dissection triage and the predicate CINA CHEST triage are intended to aid in prioritization and triage of radiological images for the indications of aortic dissection. Both devices are software packages with similar technological characteristics and principles of operation, incorporating deep learning Al algorithms that process images, and software to send notifications and display unannotated compressed low-quality preview images. In both
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devices, the labeling clearly states that the devices are not for diagnostic use and instructs the user to further evaluate and diagnose based only on the original images in the local PACS.
Both devices operate in parallel to the standard of care workflow in the sense that they do not change the original image, do not provide any marking on the output preview, do not remove images from the standard of care FIFO queue and do not de-prioritize cases, thus not disturbing standard interpretation of the images. Both devices notify the radiologist of time-sensitive critical cases within the range of several minutes, and thus contribute similarly to the standard of care workflow turnaround time reduction through preemptive triage.
The subject BriefCase device for Aortic Dissection triage is thus substantially equivalent to the primary predicate CINA CHEST triage.