Image quality evaluation of intra-irradiation cone-beam computed tomography acquired during one- and two-arc prostate volumetric-modulated arc therapy delivery: A phantom study.

Journal of Applied Clinical Medical Physics
Hiraku IraminaTakashi Mizowaki

Abstract

To evaluate (a) the effects of megavoltage (MV)-scatter on concurrent kilovoltage (kV) projections (PMVkV ) acquired during rotational delivery, and (b) the image quality of intra-irradiation cone-beam computed tomography (ii-CBCT) images acquired during prostate volumetric-modulated arc therapy (VMAT) delivery. Experiment (1): PMVkV s were acquired with various MV beam parameters using a cylindrical phantom: field size (FS), MV energy (6 or 15 MV), dose rate (DR), and gantry speed. The average pixel values were calculated in a region on each PMVkV which were extracted at eight equally spaced gantry angles. Experiment (2): 11 one-arc and seven two-arc 15 MV prostate VMAT plans were used along with a pelvis phantom. One plan was selected from each of arc plans and its MV energy was changed to 6 MV. After PMVkV s were acquired, projections consisting of MV-scatter only (PMVS ) were acquired with closing kV blades and subtracted from PMVkV (PMVScorr ). Projections by kV beams only were acquired (PkV ). The corresponding CBCT images were reconstructed (CBCTMVkV , CBCTMVScorr , and CBCTkV ). The root-mean-square errors (RMSEs) were calculated in prostate region and 3D gamma analysis was conducted, in which the CBCT-number was used i...Continue Reading

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Citations

Nov 26, 2020·Physics in Medicine and Biology·Hiraku IraminaTakashi Mizowaki

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Methods Mentioned

BETA
irradiating

Software Mentioned

KIM
Veritas
VMAT
iTools
Eclipse

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