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- W2041564451 abstract "Weekly scans of test objects were carried out on a newly installed Picker 1200SX CT scanner over the period March 1983 to March 1984. The objectives of the investigation were: (1) To examine the performance of the scanner (2) To identify the most useful measurement parameters for a practical quality assurance programme (3) To establish the frequency at which performance monitoring should be carried out in the future. The complexity of CT scanners means that many parameters are necessary to quantify performance comprehensively. However, for routine quality assurance work, it is desirable to summarise performance by as few parameters as possible. Hence we have measured certain features such as field nonuniformity and reproducibility of CT values in a way which does not attempt to distinguish between the various possible contributing sources of such errors. Naturally, if unacceptably large variations in these generalised parameters were observed, further tests would be necessary in order to establish the causes in more detail. This was measured by the noise present in Full Field (FF) and Half Field (HF) scans of water-filled circular phantoms, one 30 cm in diameter for FF scans and one 19 cm in diameter for HF scans. One particular spatial filter (algorithm 3) was used. Measurements were taken in five circular regions of interest, each containing about 3000 pixels, positioned in the centre and four quadrants of the image. The standard deviations of CT numbers in the five regions of interest were averaged to reduce the effect of image non-uniformity." @default.
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- W2041564451 date "1985-10-01" @default.
- W2041564451 modified "2023-09-26" @default.
- W2041564451 title "The value of systematic performance monitoring on a Picker 1200SX CT scanner" @default.
- W2041564451 cites W2015323553 @default.
- W2041564451 doi "https://doi.org/10.1259/0007-1285-58-694-1021" @default.
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