Open-Source Pattern Creation Tool for Medical Extended Reality Image Quality Assessment

Abstract

The potential for extended reality devices in medicine has recently grown. In order to approve these devices for medical use, they must be evaluated on many characteristics to ensure safety and effectiveness. One of the most important evaluations is the quality of the device's display, known as image quality, especially for medical applications (Zhao et al., 2023). The image quality evaluation of virtual and augmented reality devices requires the creation of a variety of different test patterns. These test patterns consist of many different shapes that must frequently change their location, size, or color in order to adapt to the many headsets in the market (Beams et al., 2020) (Zhao et al., 2023. The Pattern Creation Tool allows for the creation, editing, and sharing of patterns that work in a mixed reality environment. The Pattern Creation Tool includes multiple default patterns that are commonly used in image quality evaluation. These include a pattern for finding the center of the device's display, a pattern to measure geometric distortion, a pattern to measure Michelson contrast, and a pattern to measure line spread. These patterns can make simple testing easier as well as serve as a template for other patterns.

Geometric distortion on video see‐through head‐mounted displays

“…The dot array is rendered and centered on the Meta Quest 3 and VIVE XR Elite HMDs using an FDA developed WebXR-based test pattern generation tool. 17,18 Geometric distortion measurement on the digital content shown on the right eyepiece follows the eye rotation method described by Penczek et al 10 Figure 5A,C shows the measured 2D position of the digital dot array rendered at a virtual distance 72.3 cm away from the LMD rotation center. The 2D distortion map shown in Figure 5B demonstrates negligible distortion of less than 1 mm on the non-VST digital content rendered on the Meta Quest 3 HMD.…”