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Rapid is an image processing software package to be used by trained professionals,including but not limited to physicians and medical technicians. The software runs ona standard off-the-shelf computer or a virtual platform, such as VMware, and can be used to perform image viewing, processing and analysis of images. Data and images are acquired through DICOM compliant imaging devices.

Rapid provides both viewing and analysis capabilities for functional and dynamic imaging datasets acquired with CT Perfusion (CTP). CT Angiography (CTA), and MRI including a Diffusion Weighted MRI (DWI) Module and a Dynamic Analysis Module (dynamic contrast-enhanced imaging data for MRI and CT).

The CT analysis includes NCCT maps showing areas of hypodense and hyperdense tissue.

The DWI Module is used to visualize local water diffusion properties from the analysis of diffusion weighted MRI data.

The Dynamic Analysis Module is used for visualization and analysis of dynamic imaging data, showing properties of changes in contrast over time. This functionality includes calculation of parameters related to tissue flow (perfusion) and tissue blood volume.

Rapid CT-Perfusion and Rapid MR-Perfusion can be used by physicians to aid in the selection of acute stroke patients (with known occlusion of the intracranial internal carotid artery or proximal middle cerebral artery)Instructions for the use of contrast agents for this indication can be found in Appendix A of the User's Manual. Additional information for safe and effective drug use is available inthe product-specific iodinated CT and gadolinium-based MR contrast drug labeling.

In addition to the Rapid imaging criteria, patients must meet the clinical requirements for thrombectomy, as assessed by the physician, and have none of the following contraindications or exclusions:

• · Bolus Quality: absent or inadequate bolus.
• · Patient Motion: excessive motion leading to artifacts that make the scan technically inadequate
• Presence of hemorrhage

Rapid is a software package that provides for the visualization and study of changes in tissue using digital images captured by diagnostic imaging systems including CT (Computed Tomography) and MRI (Magnetic Image Resonance), as an aid to physician diagnosis. Rapid can be installed on a customer's Server or it can be accessed online as a virtual system. It provides viewing, quantification, analysis and reporting capabilities.

Rapid is a Software as a Medical Device (SaMD) consisting of one or more Rapid Servers (dedicated or virtual) in on-premises or hybrid (on-premises/cloud) configurations. The Rapid Server is an image processing engine that connects to a hospital LAN, or inside the Hospital Firewall in the on-premises configuration or in conjunction with a secure link to the cloud in the hybrid configuration. It can be a dedicated Rapid Server or a VM Rapid appliance, which is a virtualized Rapid Server that runs on a dedicated server.

Rapid is designed to streamline medical image processing tasks that are time consuming and fatiguing in routine patient workup. Once Rapid is installed it operates with minimal user interaction. Once the CT (NCCT, CT, CTA) or MR (MR, MRA) data are acquired, the CT or MRI console operator selects Rapid as the target for the DICOM images, and then the operator selects which study/series data to be sent to Rapid. Based on the type of incoming DICOM data. Rapid will identify the data set scanning modality and determine the suitable processing module. The Rapid platform is a central control unit which coordinates the execution image processing modules which support various analysis methods used in clinical practice today.

Here's an analysis of the provided text to fulfill your request, noting that the document is an FDA 510(k) clearance letter and summary, which typically focuses on demonstrating substantial equivalence to a predicate device rather than presenting a detailed de novo device performance study. Therefore, some of the requested information (like specific effect sizes from MRMC studies or detailed ground truth establishment for a training set) might not be explicitly present if the submission didn't require entirely new clinical performance data for clearance.

Key Observation from the Document:
The document (K233512) is a 510(k) summary for iSchemaView Rapid (6.0), claiming substantial equivalence to a previously cleared predicate device, Rapid (K213165). The primary change appears to be an "extension of installation in a hybrid configuration (on-premises and hybrid)." This implies that extensive new clinical performance studies for the core functionality may not have been required, as the device is deemed "as safe and effective as the previously cleared Rapid (K213165) with an extension of installation in a hybrid configuration."

Given this, the "acceptance criteria" and "study that proves the device meets the acceptance criteria" are largely framed around demonstrating equivalence to the predicate and ensuring the new configuration doesn't introduce new safety or effectiveness concerns.

Acceptance Criteria and Device Performance (Based on the provided document)

Since this is a 510(k) submission for substantial equivalence based on a predicate, the "acceptance criteria" are implied to be that the device performs equivalently to the predicate and any new features (like hybrid configuration) do not negatively impact safety or effectiveness. The document highlights software verification and validation as the primary means of demonstrating compliance.

1. Table of Acceptance Criteria and Reported Device Performance

• Image viewing, processing, and analysis of CT/MRI images for functional and dynamic imaging datasets.
• Specific modules: CT-Perfusion, MR-Perfusion, DWI, Dynamic Analysis, NCCT maps (hypodense/hyperdense tissue), CTA.
• Aid in selection of acute stroke patients (with known occlusion of intracranial ICA or proximal MCA).
• Calculation of parameters related to tissue flow (perfusion) and tissue blood volume. | "Rapid has the same intended use and similar indications, technological characteristics and principles of operation as its predicate devices."
  "Rapid is as safe and effective as the previously cleared Rapid (K213165) with an extension of installation in a hybrid configuration..." |
  | Technical Compliance:
• DICOM compliance.
• Operates on standard off-the-shelf computers or virtual platforms.
• Handles DICOM medical image data (CT, MRI) from various sources.
• Secure communication protocols (SMTP with security extensions, VPN, SSH). | "Rapid complies with DICOM (Digital Imaging and Communications in Medicine) - Developed by the American College of Radiology and the National Electrical Manufacturers Association. NEMA PS 3.1 - 3.20."
  "Rapid is a DICOM-compliant PACS software..."
  "Rapid runs on standard 'off-the-shelf' computer and networking hardware."
  "Rapid generally connects to the infrastructure of the medical partner... Rapid uses a SMTP protocol with security extensions to provide secure communications."
  "Available types of connection include VPN (Virtual Private Network - RFC2401 and RFC4301 Standards) Tunnel and SSH (Secure Shell)." |
  | Performance Accuracy & Reliability:
• Accurate representation of key processing parameters.
• Handles clinically relevant parameters and perturbations.
• Meets all design requirements and specifications. | "iSchemaView conducted extensive performance validation testing and software verification and validation testing of the Rapid system."
  "This performance validation testing demonstrated that the Rapid system provides accurate representation of key processing parameters under a range of clinically relevant parameters and perturbations associated with the intended use of the software."
  "Software performance, validation and verification testing demonstrated that the Rapid system met all design requirements and specifications."
  "The Rapid System performance has been validated with phantom and case data." |
  | Safety & Effectiveness (no new issues compared to predicate):
• Compliance with QSR (21 CFR Part 820.30).
• Risk management (EN ISO 14971:2019).
• Software lifecycle processes (IEC 62304:2016).
• Usability engineering (IEC 62366:2015). | "Rapid has been designed, verified and validated in compliance with 21 CFR, Part 820.30 requirements. The device has been designed to meet the requirements associated with EN ISO 14971:2019 (risk management)."
  "Rapid raises no new issues of safety or effectiveness compared to Rapid (K2131650), as demonstrated by the testing conducted with Rapid." |

2. Sample Size Used for the Test Set and Data Provenance

The document mentions "The Rapid System performance has been validated with phantom and case data." However, it does not specify the sample size for the test set of "case data" or "phantom data", nor does it specify the country of origin or whether the data was retrospective or prospective. For a 510(k), particularly one proving substantial equivalence to a predicate, new large-scale clinical studies are not always required if software verification and validation suffice, as implied here.

3. Number of Experts Used to Establish Ground Truth for the Test Set and Their Qualifications

The document states, "The primary users of Rapid software are medical imaging professionals who analyze tissue using CT or MRI images." However, it does not specify the number of experts used to establish ground truth for the test set, nor does it provide their specific qualifications (e.g., number of years of experience, specific board certifications). It only generically refers to "trained professionals, including but not limited to physicians and medical technicians."

4. Adjudication Method for the Test Set

The document does not specify any adjudication method (e.g., 2+1, 3+1) used for the test set.

5. If a Multi-Reader Multi-Case (MRMC) Comparative Effectiveness Study Was Done

The document does not indicate that a Multi-Reader Multi-Case (MRMC) comparative effectiveness study was done comparing human readers with AI vs. without AI assistance, nor does it state an effect size for such an improvement. The focus is on the device's standalone performance and its equivalence to the predicate.

6. If a Standalone Performance Study (Algorithm Only Without Human-in-the-Loop Performance) Was Done

Yes, the document implies that a standalone performance evaluation of the algorithm's core processing capabilities was conducted. It states: "iSchemaView conducted extensive performance validation testing and software verification and validation testing of the Rapid system. This performance validation testing demonstrated that the Rapid system provides accurate representation of key processing parameters under a range of clinically relevant parameters and perturbations associated with the intended use of the software." This refers to the algorithm's performance in processing images and generating analyses.

7. The Type of Ground Truth Used

The document states, "The Rapid System performance has been validated with phantom and case data." This suggests that the ground truth for "phantom data" would be known physical or simulated values. For "case data," the document does not explicitly state the type of ground truth, such as expert consensus, pathology, or outcomes data. However, given the context of stroke patient selection, clinical outcomes or expert consensus on imaging findings would typically be relevant for such applications.

8. The Sample Size for the Training Set

The document does not provide any information regarding the sample size used for the training set. As this is a 510(k) for an updated version of an existing device, it's possible that the training data for the core AI components was part of earlier development and was not re-evaluated for this specific submission, or that detailed training data was not a required element for this type of substantial equivalence claim.

9. How the Ground Truth for the Training Set Was Established

The document does not provide any information on how the ground truth for the training set was established.

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