Evaluation of dose from kV cone-beam computed tomography during radiotherapy: a comparison of methodologies

Micro-Mini & Nano-Dosimetry & Innovative Technologies in Radiation Therapy

Buckley, J.^1 ; Wilkinson, D.^2 ; Malaroda, A.^1 ; Metcalfe, P.^1

Centre for Medical Radiation Physics, University of Wollongong, NSW

2522, Australia^1

Illawarra Cancer Care Centre, Wollongong Hospital, NSW

2500, Australia^2

关键词: Cone beam;    Cone-beam computed tomography;    Human health;    Scan mode;    Task groups;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/777/1/012003/pdf
DOI  :  10.1088/1742-6596/777/1/012003

来源: IOP

【 摘 要 】

Three alternative methodologies to the Computed-Tomography Dose Index for the evaluation of Cone-Beam Computed Tomography dose are compared, the Cone-Beam Dose Index, IAEA Human Health Report No. 5 recommended methodology and the AAPM Task Group 111 recommended methodology. The protocols were evaluated for Pelvis and Thorax scan modes on Varian® On-Board Imager and Truebeam kV XI imaging systems. The weighted planar average dose was highest for the AAPM methodology across all scans, with the CBDI being the second highest overall. A 17.96% and 1.14% decrease from the TG-111 protocol to the IAEA and CBDI protocols for the Pelvis mode and 18.15% and 13.10% decrease for the Thorax mode were observed for the XI system. For the OBI system, the variation was 16.46% and 7.14% for Pelvis mode and 15.93% to the CBDI protocol in Thorax mode respectively.