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13 December 1983 Quality Assurance For Computed Tomography - Correlation With System Performance
Donald R. Jacobson
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Proceedings Volume 0419, Application of Optical Instrumentation in Medicine XI; (1983) https://doi.org/10.1117/12.936019
Event: Application of Optical Instrumentation in Medicine XI, 1983, Atlanta, United States
Abstract
A user based quality assurance program for assessing image quality changes in Computed Tomography is described. Measured image quality parameters include: CT number and standard deviation (noise) in a water phantom, contrast scale based on the CT number difference between plexiglass and water, and resolution as indicated by the modulation of a plastic bar pattern. For any quality assurance program to be effective, realistic values for allowable variation in image quality parameters must be established. This requires an understanding of the effect on image parameters caused by variations in the CT system parameters. In order to understand this interaction, a General Electric CT/T 8800 scanner was systematically "detuned" and image quality parameters monitored. CT system parameters studied include kVp, x-ray tube focal spot size, x-ray output, slice thickness and system alignment. The effect on the image for each system parameter is established and an attempt is made to identify system parameters whose status can be assessed by image parameter measurements.
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Donald R. Jacobson "Quality Assurance For Computed Tomography - Correlation With System Performance", Proc. SPIE 0419, Application of Optical Instrumentation in Medicine XI, (13 December 1983); https://doi.org/10.1117/12.936019
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KEYWORDS
Image quality
X-ray computed tomography
Computed tomography
Scanners
Image processing
Imaging systems
Process control
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