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Irradiation Dose Verification by Arc CHECK on Breast Therapy Cancer Tomotherapy
Author(s): ZHANG Jin-jian, LI Jing, WEN Ting, YE Liu-qing, LI Zhi-qiang, HOU You-xian, JIA Jun-song, CHEN Jing, WANG Yan, ZHONG Yu, Department of Helical Tomotherapy Center, PLA General Hospital of Guangzhou Command
Pages: 244-
247
Year: 2015
Issue:
2
Journal: Chinese Journal of Medical Physics
Keyword: breast tumor; helial tomotherapy; IMRT irradiation dose verification; Arc CHECK;
Abstract: Objective To discuss the clinical application of Arc CHECK on the breast irradiation dose verification using Helical Tomo Therapy. Methods A total of 20 patients with breast tumor were selected, whose irradiation plan were transplant to the Arc check phantom for the IMRT dose verification. The measured dose distributed on the corresponding plans were compared with those calculated by the treatment planning system(TPS). Based on several different Gamma criteria, the Gamma analysis method was utilized to evaluate the dose verification. Results The γ pass rate of 20 breast irradiation dose verification with Arc check in threshold level(threshold, TH) of 10%, the γ pass rate with criteria 3%/3 mm, 3%/4 mm, 3%/5 mm were 40%(case of the total number), 55%, 80%, respectively. Threshold level(threshold, TH) of 15%, the γ pass rate with criteria 3%/3 mm, 3%/4mm, 3%/5 mm were 40%(case of the total number)、55%、85%, respectively. Threshold level of 10%, the γ pass rate with criteria 3%/3mm, 3%/4 mm, 3%/5 mm were 40%, 60%, 85%, respectively. Threshold level of 10%, the γ pass rate with criteria 5%/5 mm, all plans were reached 90%. Target dose homogeneity index(HI), synchronous integrated boost(SIB), target area within the boundaries to skin edge and lymph nodes has no effect on γ rate(P>0.05). Phantom center deviates from the negative direction is greater than 4 cm in 11 cases, only two cases to verify the results reached 3%/3 mm(TH=10), the proportion was 18%;phantom center deviation is greater than the positive direction 4 cm in 9 cases, there are six cases of the verification result reach3%/3 mm(TH=10), the ratio was 66.7%. Conclusion Arc check rotating intensity-modulated authentication system can be used for breast cancer HT planned dose verification and effectively simplify the procedure of HT dose verification, but the phantom center and the machine center offset to the influence of the pass rate still need to cooperate with the third party authentication system for further study.
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