Davis, AT;
Palmer, AL;
Nisbet, A;
(2020)
Can different Catphan phantoms be used in a multi-centre audit of radiotherapy CT image quality?
Physica Medica
, 78
pp. 38-47.
10.1016/j.ejmp.2020.09.003.
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Abstract
PURPOSE: To determine the variation between Catphan image quality CT phantoms, specifically for use in a future multi-centre image quality audit. METHOD: 14 Catphan phantoms (models 503, 504 and 604) were scanned on a Canon Aquilion Prime CT scanner using a single scan protocol. Measurements were made of noise in the uniformity section, visibility of low contrast targets and contrast, x-ray attenuation and CT number for 5 materials in the sensitometry section. Scans were also acquired using one phantom and varying reconstruction field of view, image slice thickness, effective tube-current-time product and iterative reconstruction settings to determine how the degree of inter-phantom variability compared with the magnitude of changes from scan parameter alteration. RESULTS: Across all phantoms the mean CT value in the uniformity section was 7.0 (SD 0.9) range: 4.9-8.1 HU. For the different materials the CT numbers were air: -1004 ± 5, Polymethylpentene: -190 ± 2, Polystyrene: -42 ± 2, Delrin: 321 ± 5 and Teflon: 898 ± 8 HU. Consistency of low contrast targets through visual scoring was good. Measured contrast was lower (p < 0.001) with more variability for 504 versus 604 models. All phantoms produced identical tube current settings with x-ray tube current modulation, indicating no x-ray attenuation differences. The degree of change in image quality metrics between phantoms was small compared with results when scan parameters were varied. CONCLUSION: Catphan phantoms model 604 showed minimal differences and will be used for multi-centre inter-comparison work, with the consistency between phantoms appropriate for measuring possible variations in image quality.
| Type: | Article |
|---|---|
| Title: | Can different Catphan phantoms be used in a multi-centre audit of radiotherapy CT image quality? |
| Location: | Italy |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.ejmp.2020.09.003 |
| Publisher version: | http://dx.doi.org/10.1016/j.ejmp.2020.09.003 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | CT, Catphan, Consistency, Phantom |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Med Phys and Biomedical Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10110910 |
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