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For In Vitro Diagnostic Use

FullFocus is a software intended for viewing and management of digital images of scanned surgical pathology slides prepared from formalin-fixed paraffin embedded (FFPE) tissue. It is an aid to the pathologist to review, interpret and manage digital images of pathology slides for primary diagnosis. FullFocus is not intended for use with frozen sections, cytology, or non-FFPE hematopathology specimens.

It is the responsibility of a qualified pathologist to employ appropriate procedures and safeguards to assure the quality of the images obtained and, where necessary, use conventional light microscopy review when making a diagnostic decision. FullFocus is intended to be used with the interoperable components specified in the below Table.

Table: Interoperable components of FullFocus

FullFocus, version 2.29, is a web-based software-only device that facilitates the viewing and navigating of digitized pathology images of slides prepared from FFPE-tissue specimens acquired from FDA cleared digital pathology scanners on FDA cleared displays. FullFocus renders these digitized pathology images for review, management and navigation for pathology primary diagnosis.

Image acquisition is performed using the intended scanner (s), with the operator conducting quality control on the digital WSI images according to the scanner's instructions for use and lab specifications to determine if re-scans are needed. Please see the Intended Use section and below tables for specifics on scanners and respective displays for clinical use.

Once a whole slide image is acquired using the intended scanner and becomes available in the scanner's database file system, a separate medical image communications software (not part of the device), automatically uploads the image and corresponding metadata to persistent cloud storage. Integrity checks are performed during the upload to ensure data accuracy.

The subject device enables the reading pathologist to open a patient case, view the images, and perform actions such as zooming, panning, measuring distances and annotating images as needed. After reviewing all images for a case, the pathologist will render a diagnosis.

FullFocus operates with and is validated for use with the FDA cleared components specified in the tables below:

Table 1: Interoperable Components Intended for Use with FullFocus

FullFocus version 2.29 was not validated for the use with images generated with Philips Ultra Fast Scanner.

Table 2: Computer Environment/System Requirements for during the use of FullFocus

Here's a breakdown of the acceptance criteria and the study proving the device meets them, based on the provided text:

1. Table of Acceptance Criteria and Reported Device Performance

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

• Sample Size for Pixel-wise Comparison: 30 formalin-fixed paraffin-embedded (FFPE) tissue glass slides, representing a range of human anatomical sites.
• Sample Size for Turnaround Time & Measurements: Not explicitly stated as a number of distinct cases or images beyond the 30 slides used for pixel-wise comparison. For measurements, a "1 Calibration Slide" was used per test.
• Data Provenance: The text does not explicitly state the country of origin. The slides are described as "representing a range of human anatomical sites," implying a diverse set of real-world pathology samples. It is a retrospective study as it states "30 formalin-fixed paraffin-embedded (FFPE) tissue glass slides... were scanned".

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

• Pixel-wise Comparison: "For each WSI, three regions of interest (ROIs) were identified to highlight relevant pathological features, as verified by a pathologist."
  • Number of Experts: At least one pathologist.
  • Qualifications: "A pathologist" (specific qualifications like years of experience are not provided).
• Measurements: No expert was explicitly mentioned for establishing ground truth for measurements; it relies on a "test image containing objects with known sizes" (calibration slide) and "reference value."

4. Adjudication Method for the Test Set

• The text does not mention an explicit adjudication method (like 2+1 or 3+1 consensus) for the pixel-wise comparison or measurement accuracy. For the pixel-wise comparison, ROIs were "verified by a pathologist," suggesting a single-expert verification rather than a consensus process.

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

• No, an MRMC comparative effectiveness study was not done in this context. The study focused on demonstrating identical image reproduction (pixel-wise comparison) and technical performance (turnaround time, measurement accuracy) of the FullFocus viewer against predicate devices' viewing components. It did not directly assess the improvement in human reader performance (e.g., diagnostic accuracy or efficiency) with or without AI assistance. The device is a "viewer and management software," not an AI diagnostic aid in the sense of providing specific findings or interpretations.

6. If a Standalone (i.e., algorithm only without human-in-the-loop performance) Was Done

• Yes, a standalone "algorithm only" performance was effectively done for the technical aspects. The pixel-wise comparison directly compares the image rendering of FullFocus with the predicate viewer's rendering without human intervention in the comparison process itself (though a pathologist verified ROIs). Similarly, turnaround times and measurement accuracy are intrinsic technical performances of the software.

7. The Type of Ground Truth Used

• Pixel-wise Comparison: The ground truth for this test was the digital image data as rendered by the predicate device's IRMS. The goal was to show that FullFocus reproduces the same image data. The "relevant pathological features" within ROIs were "verified by a pathologist" which served as a reference for what areas to test, not necessarily a diagnostic ground truth for the device's output.
• Measurements: The ground truth was based on known physical dimensions within a calibration slide and corresponding "reference values."

8. The Sample Size for the Training Set

• The provided text does not mention a training set. This is expected because FullFocus is a viewer and management software for digital pathology images, not an AI or machine learning algorithm that is "trained" on data to make predictions or assist in diagnosis directly. Its core function is to display existing image data accurately and efficiently.

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

• As no training set is mentioned (since it's a viewer software), this question is not applicable based on the provided text.

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FullFocus™ is a software only device intended for viewing and management of digital images of scanned surgical pathology slides prepared from formalin-fixed paraffin embedded (FFPE) tissue. It is an aid to the pathologist to review, interpret, and manage digital images of pathology slides for primary diagnosis. FullFocus is not intended for use with frozen sections, cytology, or non-FFPE hematopathology specimens.

It is the responsibility of a qualified pathologist to employ appropriate procedures and safeguards of the images obtained and, where necessary, use conventional light microscopy review when making a diagnostic decision. FullFocus is intended for use with Philips Ultra Fast Scanner and monitor displays validated with verified test methods to meet required performance characteristics.

FullFocus is a web-based software-only device for viewing and manipulating digital pathology images of glass slides obtained from the Philips IntelliSite Pathology Solution (PIPS) Ultra Fast Scanner (UFS) on the monitor displays that are validated with verified test methods to meet required performance characteristics. FullFocus reproduces the whole slide images and is an aid to the pathologist to review. interpret and manage digital images of pathology slides for primary diagnosis.

Here's a breakdown of the acceptance criteria and the study information for the FullFocus device, based on the provided FDA 510(k) summary:

Acceptance Criteria and Reported Device Performance

Further Study Information

1. Sample size used for the test set and data provenance:

   • Clinical Study: No clinical study involving diagnosis by human readers for diagnostic accuracy comparison is mentioned in this document. The "studies" described are non-clinical technical performance assessments and human factors testing.
   • Pixel-wise comparison: The document doesn't specify a sample size for slides or images, only that it "was conducted to compare color images reproduced by FullFocus and PIPS IMS." Data provenance is not mentioned, but it's implied the images were generated by a Philips Ultra Fast Scanner, given the device's compatibility and comparison to the PIPS IMS.
   • Measurements: "a test image containing objects with known sizes" was used. Specific sample size is not indicated.
   • Human Factors Testing: "Task-based usability tests" were performed. The number of participants (intended users) is not specified.

2. Number of experts used to establish the ground truth for the test set and the qualifications of those experts:

   • For the pixel-wise comparison, the "ground truth" was essentially the visual fidelity to images produced by the predicate device (PIPS IMS). The "human readers" mentioned in the performance description are not described as experts establishing ground truth, but rather as observers confirming visual adequacy. No specific number or qualifications of these readers are given.
   • For measurements, the ground truth was the "known sizes" of objects within a test image. This would not require expert pathologists to establish.
   • For human factors testing, the "ground truth" relates to usability and safety, which is assessed directly by intended users during task performance, rather than established by an "expert" in the diagnostic sense.

3. Adjudication method for the test set:

   • Not applicable as there was no study described that involved diagnostic interpretations requiring adjudication.

4. If a multi reader multi case (MRMC) comparative effectiveness study was done, and the effect size of how much human readers improve with AI vs without AI assistance:

   • No. The document explicitly states that FullFocus is a "software only device intended for viewing and management of digital images... It is an aid to the pathologist to review, interpret, and manage digital images...". It is a viewer, not an AI-assisted diagnostic tool. Therefore, an MRMC study comparing human readers with and without AI assistance was not performed or described.

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

   • No. FullFocus is a viewing and management system for pathologists, not a standalone diagnostic algorithm. Its function is to facilitate human review.

6. The type of ground truth used:

   • For Pixel-wise comparison, the ground truth was the visual representation and fidelity of images from the predicate device (PIPS IMS).
   • For Measurements, the ground truth was "known sizes" of objects in a test image.
   • For Turnaround time and Human factors testing, the ground truth was based on pre-defined system requirements and direct usability observations/feedback.

7. The sample size for the training set:

   • Not applicable. FullFocus is described as a viewing and management software, not an AI or machine learning algorithm that requires a training set in the typical sense for diagnostic performance.

8. How the ground truth for the training set was established:

   • Not applicable, as no training set for an AI/ML algorithm is described.

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