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1 May 1992 Automated quality assurance of a CT scanner video frame grabber
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While acceptance of standards for digital image transfer may make video image capture obsolete, this technique of getting an image from a device such as a CT scanner will be in use for many years. Because the devices are inherently analog, these circuits are susceptible to errors in image capture, which can lead to degradation in image quality. We have designed a series of phantom images and used them to periodically measure the quality of captured images. The CT images are displayed at specific window width and window level settings, so that the value of each pixel is known, and is analyzed automatically by a computer program. The procedure involves capturing each of the four quality assurance (QA) images and storing them on the image capture computer. The QA software may be run immediately or it may be run at a later date, when it will analyze images collected over a period of time. The results of the analysis are stored in the computer in a database. This allows displays of the captured image quality, including tables, graphs, charts, and trend plots. A video frame grabber was connected to a CT advantage computed tomography independent console. The images were captured once per week over a period of three months to determine the range of variation which could be expected in the first part of the device's useful life.
© (1992) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Alan H. Rowberg and Jing Lian "Automated quality assurance of a CT scanner video frame grabber", Proc. SPIE 1653, Medical Imaging VI: Image Capture, Formatting, and Display, (1 May 1992);

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