Rotation Errors of Breast Cancer on 3D-CRT in TomoDirect
- Alternative Title
- 토모다이렉트 3D-CRT을 이용한 유방암 환자의 회전 오차
- Abstract
- The purpose of this study was to analyze the rotational errors of roll, pitch, and yaw in the whole breast cancer treated by the three-dimensional radiation therapy (3D-CRT) using TomoDirect (TD). Twenty-patient previously treated with TD 3D-CRT was selected. We performed a retrospective clinical analysis based on 80 images of megavoltage computed tomography (MVCT) including the systematic and random variation with patient setup errors and treatment setup margin (mm). In addition, a rotational error (degree) for each patient was analyzed using the automatic image registration. The treatment margin of X, Y, and Z directions were 4.2 mm, 6.2 mm, and 6.4 mm, respectively. The mean value of the rotational error for roll, pitch, and yaw were $0.3^{\circ}$, $0.5^{\circ}$, $0.1^{\circ}$, and all of systematic and random error was within $1.0^{\circ}$. The errors of patient positioning with the Y and Z directions have generally been mainly higher than the X direction. The percentage in treatment fractions in less than $2^{\circ}$ at roll, pitch, and yaw are 95.1%, 98.8%, and 97.5%, respectively. However, the edge of upper and lower (i.e., bottom) based on the center of therapy region (point) will quite a possibility that it is expected to twist even longer as the length of treatment region. The patient-specific characters should be considered for the accuracy and reproducibility of treatment and it is necessary to confirm periodically the rotational errors, including patient repositioning and repeating MVCT scan.
- All Author(s)
- 정재홍
; 조광환
; 문성권
; 배선현
; 민철기
; 김은석
; 여승구
; 최진호
; 정주영
; 최보영
; 서태석
- Issued Date
- 2015
- Type
- Article
- Keyword
- Breast cancer; Setup error; Rotation error; MVCT
- Publisher
- 한국의학물리학회
- ISSN
- 1226-5829
; 2288-9620
; 2508-4445
; 2508-4453
- Citation Title
- Progress in Medical Physics
- Citation Volume
- 26
- Citation Number
- 1
- Citation Start Page
- 6
- Citation End Page
- 11
- Language(ISO)
- eng
- URI
- http://schca-ir.schmc.ac.kr/handle/2022.oak/572
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