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The VMS+ is an adjunct to existing ultraging systems and is intended to record, analyze, store and retrieve digital ultrasound images for computerized 3-dimensional image processing.

The VMS+ is indicated for use where Left Ventricle (LV), Right Ventricle (RV), Left Atrium (LA), and Right Atrium (RA) volumes and ejection fractions are warranted or desired.

The VentriPoint Medical System was cleared under 510(k) K150628 for use in right ventricle evaluation where RV volumes and ejection fractions are warranted or desired. This current submission is intended to expand system use to Left ventricle (LV), Right Atrium (RA), and Left Atrium (LA) volumes and ejection fractions. LV, RA, LA evaluation is accomplished by the addition of KBR heart catalogs containing a variety of heart models for each chamber. VMS+ employs the same fundamental scientific technology to that of the cleared device.

The provided text describes the Ventripoint Medical System Plus (VMS+) and its substantial equivalence to a predicate device, the Ventripoint Medical System (K150628). The submission aims to expand the system's use from only the right ventricle (RV) to include the left ventricle (LV), right atrium (RA), and left atrium (LA) volumes and ejection fractions.

However, the document explicitly states that "The VMS+, subject of this submission, did not require clinical studies to support the determination of substantial equivalence." This means that a clinical study proving the device meets specific acceptance criteria for clinical performance as an AI-powered diagnostic tool was not conducted or submitted for this particular expansion of indications for use. The focus of the provided text is on demonstrating substantial equivalence based on technological characteristics and the performance of its "catalogs" for LV, LA, and RA evaluation through bench testing.

Therefore, many of the requested elements for describing clinical acceptance criteria and a study proving their fulfillment cannot be directly extracted from the provided text for the expanded indications.

Here's a breakdown of what can and cannot be answered based on the provided text:

1. A table of acceptance criteria and the reported device performance

Based on the provided text, specific clinical acceptance criteria (e.g., sensitivity, specificity, accuracy targets) for LV, LA, and RA volume/ejection fraction measurement are not explicitly stated or reported.

The document mentions "Performance bench testing of the LV, LA, and RA catalogues was completed to verify suitability for left ventricle, left atrium, and right atrium evaluation. Testing of the LV, LA, and RA catalogs consisted of a robust series of automated and manual testing to verify reconstruction accuracy."
However, the results of this testing, in terms of quantitative performance against specific criteria, are not detailed in this submission summary.

2. Sample sized used for the test set and the data provenance (e.g. country of origin of the data, retrospective or prospective)

The text mentions "Performance bench testing" but does not specify a "test set" in the context of human subject data, nor does it provide details on sample size, or data provenance. This is consistent with the statement that clinical studies were not required.

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)

Not applicable, as a clinical test set with expert-established ground truth is not described.

4. Adjudication method (e.g. 2+1, 3+1, none) for the test set

Not applicable.

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

No such study is mentioned or described in the provided text. The device is described as an "adjunct to existing ultraging systems" and a "computerized 3-dimensional image processing" system, implying it's a tool for measurement rather than an AI for interpretation that would typically require MRMC studies.

6. If a standalone (i.e. algorithm only without human-in-the-loop performance) was done

The "Performance bench testing of the LV, LA, and RA catalogues... to verify reconstruction accuracy" could be considered a form of standalone performance evaluation for the reconstruction accuracy component. However, the quantitative results and the specific methodology are not detailed.

7. The type of ground truth used (expert concensus, pathology, outcomes data, etc)

For the "reconstruction accuracy" bench testing, the ground truth would likely be a known, precisely measured physical model or a highly accurate reference standard within the testing environment. The text does not specify the exact nature of this ground truth.

8. The sample size for the training set

The device uses "KBR heart catalogs containing a variety of heart models for each chamber." This refers to a "Knowledge Based Reconstruction database." The sample size or specific details of this "training set" (in the machine learning sense) are not provided. The term "catalogs" suggests a collection of models used by the system for its reconstruction process, rather than a dynamically trained AI model in the contemporary sense.

9. How the ground truth for the training set was established

The text states the device uses a "Knowledge Based Reconstruction database" for its 3-D reconstruction. For such a system, the "ground truth" for building these "heart catalogs" would typically involve precise anatomical measurements from a diverse set of real hearts (cadaveric, surgical, or high-fidelity imaging such as MRI/CT) to create a statistical model or library of normal and abnormal heart shapes and sizes. However, the specific methodology for establishing this ground truth for the KBR catalogs is not detailed in the provided document.

Summary regarding acceptance criteria and study details based solely on the provided text:

The submission for the VMS+ expanding its indications to LV, LA, and RA did not include clinical studies demonstrating performance against specific clinical acceptance criteria. The basis for substantial equivalence for these new indications rested on the device employing the "same fundamental scientific technology" as the cleared predicate and undergoing "Performance bench testing... to verify reconstruction accuracy" for the new LV, LA, and RA catalogs. No specific quantitative targets or results from this bench testing are provided in this summary, nor are details on the test set, ground truth derivation, or expert involvement for clinical validation.

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