(105 days)
syngo. CT Single Source Dual Energy is designed to operate with CT images which have been acquired with Siemens Twin Beam Single Source scanners. The various materials of an anatomical region of interest have different attenuation coefficients, which depend on the used energy. These differences provide information on the chemical composition of the scanned body materials. syngo. CT Single Source Dual Energy combines images acquired with low and high energy spectra to visualize this information. Depending on the region of interest, contrast agents may be used.
The functionality of the syngo. CT Single Source Dual Energy applications are as follows:
- · Monoenergetic
- · Bone Removal
· Liver VNC
- · Monoenergetic Plus
- · Virtual Unenhanced
- · Rho/Z
- · Hard Plaques
· Kidney Stones*
*) Kidney Stones is designed to support the visualization of the chemical composition of kidney stones and especially the differentiation between unc acid stones. For full identification of the kidney stone additional clinical information should be considered such as patient history and urine testing. Only a well-trained radiologist can make the final diagnosis under consideration of all available information. The accuracy of identification is decreased in obese patients.
syngo.CT Single Source Dual Energy (twin beam) Software Package is a post processing application package consisting of several post-processing application classes that can be used to improve visualization of various energy dependent materials in the human body. This software application is designed to operate on the most recent version syngo.via client/server platform, which supports preprocessing and loading of datasets by syngo.via depending on configurable rules.
After loading the two reconstructed image datasets acquired with two different X-ray spectra into syngo.CT Single Source Dual Energy (twin beam), a correction algorithm is used in order to minimize motion effects. They are then displayed using linear blending with selectable mixing ratio and color scale. Multiplanar reformations (MPR) of the volume are shown in 3 image segments, which are initialized as sagittal, coronal and axial view. After arriving at an initial diagnosis on the basis of the CT-images, the user can choose one of the following application classes:
- Monoenergetic ●
- Bone Removal ●
- Liver VNC
- Monoenergetic Plus ●
- Virtual Unenhanced ●
- . Rho/Z
- Hard Plaques
- Kidnev Stones .
These application classes are designed for specific clinical tasks, so that algorithms, additional tool buttons, the use of colored overlay images and image representation (for example MPR or maximum intensity projection) is optimized correspondingly.
The provided text describes a 510(k) premarket notification for the "syngo.CT Single Source Dual Energy (twin beam)" device, which is a post-processing application for CT images. The document focuses on demonstrating substantial equivalence to predicate devices rather than directly providing acceptance criteria and performance data in a detailed format typical for a clinical study with specific endpoints.
Here's an attempt to extract the requested information based on the provided text, recognizing that significant details are not present:
1. Table of Acceptance Criteria and Reported Device Performance
The document does not explicitly list specific numerical acceptance criteria or quantitative performance metrics for the device's accuracy in a table. Instead, it relies on demonstrating that the subject device performs "as well as" the predicate device applications. The "performance" is implicitly tied to fulfilling the intended functionality and being "as safe and effective" as the predicates.
| Acceptance Criteria (Implied) | Reported Device Performance (Implied) |
|---|---|
| Functionality of applications (Monoenergetic, Bone Removal, Liver VNC, Monoenergetic Plus, Virtual Unenhanced, Rho/Z, Hard Plaques, Kidney Stones) | * General: "The results of these tests demonstrate that the subject device performs as intended." and "The subject device using twin beam datasets performs as well as the predicate device applications that were tested using the same methods." |
- Rho/Z and Kidney Stones: Functionality was tested via "Phantom bench testing and clinical validation in a retrospective study."
- Monoenergetic Plus, Bone Removal, Liver VNC, and Hard Plaques: Performance was tested via "Retrospective clinically validated studies."
- Kidney Stones (Specific Caveat): "The accuracy of identification is decreased in obese patients." and "Only a well-trained radiologist can make the final diagnosis under consideration of all available information." |
| Conformance to safety and performance standards | The device "is designed to fulfill the requirements of" ISO 14971, IEC 62304, IEC 60601 series, and DICOM standards. "Testing for verification and validation of the device was found acceptable to support the claims of substantial equivalence." |
| Software specifications met | "The testing results support that all the software specifications have met the acceptance criteria." |
| Substantial Equivalence to Predicate Devices | "The comparison of technological characteristics, non-clinical performance data, and software validation demonstrates that the subject device is as safe and effective when compared to the predicate devices that are currently marketed for the same intended use." |
2. Sample size used for the test set and the data provenance (e.g. country of origin of the data, retrospective or prospective)
- Sample Size: The document does not specify the sample size for the test set used in either the phantom bench testing or the clinical validation studies.
- Data Provenance: The studies were described as "retrospective clinically validated studies." The country of origin of the data is not mentioned.
3. Number of experts used to establish the ground truth for the test set and the qualifications of those experts (e.g. radiologist with 10 years of experience)
The document does not specify the number or qualifications of experts used to establish ground truth for the test set. It only states for "Kidney Stones" that "Only a well-trained radiologist can make the final diagnosis under consideration of all available information." This implies radiologists were involved in diagnosis but doesn't detail their role in ground truth establishment for the studies.
4. Adjudication method (e.g. 2+1, 3+1, none) for the test set
The adjudication method used for the test set is not mentioned.
5. If a multi-reader multi-case (MRMC) comparative effectiveness study was done, If so, what was the effect size of how much human readers improve with AI vs without AI assistance
The document mentions "retrospective clinically validated studies" and notes that "The subject device using twin beam datasets performs as well as the predicate device applications that were tested using the same methods." However, it does not describe a multi-reader multi-case (MRMC) comparative effectiveness study evaluating human reader improvement with AI assistance vs. without AI. The focus is on the software's performance itself and its equivalence to predicates.
6. If a standalone (i.e. algorithm only without human-in-the-loop performance) was done
Yes, the testing described appears to be primarily focused on the standalone performance of the software applications compared to predicate devices. Phrases like "Phantom bench testing" and "retrospective clinically validated studies... to test the performance for applications" suggest algorithm-only assessment of its outputs. The statement regarding the "Kidney Stones" application, "Only a well-trained radiologist can make the final diagnosis," clarifies the role of the algorithm as a support tool, implying a standalone assessment of its output, which a human then interprets.
7. The type of ground truth used (expert consensus, pathology, outcomes data, etc.)
The document does not explicitly state the type of ground truth used for any of the studies. Given the context of "clinically validated studies," it's reasonable to infer that clinical diagnosis, potentially supported by pathology or follow-up outcomes, would be part of establishing ground truth, especially for conditions like kidney stones. However, this is not explicitly detailed.
8. The sample size for the training set
The document does not mention any training set or its sample size. This is a post-processing application, and the document focuses on validation/verification testing of its functionality rather than development or training of a new AI model in the submission text.
9. How the ground truth for the training set was established
As no training set is mentioned, information on how its ground truth was established is not provided.
§ 892.1750 Computed tomography x-ray system.
(a)
Identification. A computed tomography x-ray system is a diagnostic x-ray system intended to produce cross-sectional images of the body by computer reconstruction of x-ray transmission data from the same axial plane taken at different angles. This generic type of device may include signal analysis and display equipment, patient and equipment supports, component parts, and accessories.(b)
Classification. Class II.