Quality control for on-line portal imaging systems

Rasika Rajapakshe; Thomas J. Radcliffe; Shlomo Shalev

doi:10.1117/12.146958

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30 June 1993 Quality control for on-line portal imaging systems

Rasika Rajapakshe, Thomas J. Radcliffe, Shlomo Shalev

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Proceedings Volume 1897, Medical Imaging 1993: Image Capture, Formatting, and Display; (1993) https://doi.org/10.1117/12.146958
Event: Medical Imaging 1993, 1993, Newport Beach, CA, United States

Abstract

A Quality Control (QC) test suitable for routine daily use has been developed for video based on-line portal imaging systems. It is designed to test for acceptable performance in high contrast spatial resolution. A phantom consisting of five sets of high-contrast rectangular bars with spatial frequencies of 0.1, 0.2, 0.25, 0.4, and 0.75 lp/mm is used for the test. A critical frequency f_c for which the square wave MTF is 50% is used as a 'go/no go' decision level for passing the test. Data obtained during a one month period were used to determine f_c. The test is shown to provide an automatic and objective measure of the system's imaging performance and is a useful QC tool for routine clinical work.

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Rasika Rajapakshe, Thomas J. Radcliffe, and Shlomo Shalev "Quality control for on-line portal imaging systems", Proc. SPIE 1897, Medical Imaging 1993: Image Capture, Formatting, and Display, (30 June 1993); https://doi.org/10.1117/12.146958

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