Please use this identifier to cite or link to this item:
Title: Comparison of verification accuracy and radiation dose between megavoltage CT and kilovoltage cone-beam CT
Authors: Wu, VWC 
Ho, ML
Yuen, LY
Li, KL
Lai, NF
Tsang, YC
Lee, WY
Chiu, G
Keywords: Anthropomorphic phantom
Kilovoltage cone-beam CT
Megavoltage CT
Organ dose
Verification accuracy
Issue Date: 2011
Source: Journal of radiotherapy in practice, 2011, v. 10, no. 1, p. 35-44 How to cite?
Journal: Journal of Radiotherapy in Practice 
Abstract: Purpose: This study evaluated the difference in verification performance and organ doses between megavoltage computed tomography (MVCT) and kilovoltage cone-beam computed tomography (kV CBCT). Methods: Anthropomorphic phantoms of head-and-neck (H&N) and pelvic regions were scanned by the computed tomography-simulator. A common reference standard setup position for each phantom was determined. Markings of known deviations from the standard position in the lateral, longitudinal and yaw displacements were made on the phantoms. The verifications by kV CBCT and MVCT were conducted in the linear accelerator and helical tomotherapy treatment unit respectively. The phantoms were then shifted in steps according to the assigned different degree of positional deviations. The discrepancy between the detected data and the known data (δD) indicated the detection error of the verification system. Thermoluminescent dosimeters were used for dose measurements of kV CBCT and MVCT. Results: δD of the lateral translations and yaw rotation in kV CBCT of the H&N region were lower than MVCT. There were no differences in the error detection along longitudinal direction between the two verification methods. For H&N, the mean doses of the various organs were significantly lower in kV CBCT except the skin. For the pelvis, MVCT delivered significantly higher mean dose to the prostate and femoral heads.
ISSN: 1460-3969
DOI: 10.1017/S1460396910000233
Appears in Collections:Journal/Magazine Article

View full-text via PolyU eLinks SFX Query
Show full item record


Last Week
Last month
Citations as of Aug 11, 2018

Page view(s)

Last Week
Last month
Citations as of Aug 13, 2018

Google ScholarTM



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.