Assessment of the variation in CT scanner performance (image quality and Hounsfield units) with scan parameters, for image optimisation in radiotherapy treatment planning

Physica Medica : PM : an International Journal Devoted to the Applications of Physics to Medicine and Biology : Official Journal of the Italian Association of Biomedical Physics (AIFB)
Anne T DavisAndrew Nisbet

Abstract

To define a method and investigate how the adjustment of scan parameters affected the image quality and Hounsfield units (HUs) on a CT scanner used for radiotherapy treatment planning. A lack of similar investigations in the literature may be a contributing factor in the apparent reluctance to optimise radiotherapy CT protocols. A Catphan phantom was used to assess how image quality on a Toshiba Aquilion LB scanner changed with scan parameters. Acquisition and reconstruction field-of-view (FOV), collimation, image slice thickness, effective mAs per rotation and reconstruction algorithm were varied. Changes were assessed for HUs of different materials, high contrast spatial resolution (HCSR), contrast-noise ratio (CNR), HU uniformity, scan direction low contrast and CT dose-index. CNR and HCSR varied most with reconstruction algorithm, reconstruction FOV and effective mAs. Collimation, but not image slice width, had a significant effect on CT dose-index with narrower collimation giving higher doses. Dose increased with effective mAs. Highest HU differences were seen when changing reconstruction algorithm: 56 HU for densities close to water and 117 HU for bone-like materials. Acquisition FOV affected the HUs but reconstruction FO...Continue Reading

Citations

Jun 22, 2018·Journal of Cancer Research and Clinical Oncology·Labrinus van ManenJ Sven D Mieog
May 14, 2019·Journal of Applied Clinical Medical Physics·Minoru NakaoYasushi Nagata
Apr 18, 2020·Dento Maxillo Facial Radiology·Yuki SakaiKazunori Yoshiura
Sep 6, 2020·Journal of Applied Clinical Medical Physics·Irina VergalasovaMeral Reyhan
Sep 29, 2020·Journal of X-ray Science and Technology·Hussain M AlmohiyCharbel Saade
Sep 18, 2020·Physica Medica : PM : an International Journal Devoted to the Applications of Physics to Medicine and Biology : Official Journal of the Italian Association of Biomedical Physics (AIFB)·Anne T DavisAndrew Nisbet

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