토모다이렉트 3D-CRT을 이용한 유방암 환자의 회전 오차Rotation Errors of Breast Cancer on 3D-CRT in TomoDirect
- Other Titles
- Rotation Errors of Breast Cancer on 3D-CRT in TomoDirect
- Authors
- 정재홍; 조광환; 문성권; 배선현; 민철기; 김은석; 여승구; 최진호; 정주영; 최보영; 서태석
- Issue Date
- Mar-2015
- Publisher
- 한국의학물리학회
- Keywords
- 유방암; 환자위치잡이오차; 회전오차; MVCT; Breast cancer; Setup error; Rotation error; MVCT
- Citation
- 의학물리, v.26, no.1, pp.6 - 11
- Journal Title
- 의학물리
- Volume
- 26
- Number
- 1
- Start Page
- 6
- End Page
- 11
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/79494
- DOI
- 10.14316/pmp.2015.26.1.6
- ISSN
- 2508-4445
- Abstract
- The purpose of this study was to analyze the rotational errors of roll, pitch, and yaw in the whole breast cancertreated by the three-dimensional radiation therapy (3D-CRT) using TomoDirect (TD). Twenty-patient previouslytreated with TD 3D-CRT was selected. We performed a retrospective clinical analysis based on 80 images ofmegavoltage computed tomography (MVCT) including the systematic and random variation with patient setuperrors and treatment setup margin (mm). In addition, a rotational error (degree) for each patient was analyzedusing 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°, 0.5°, 0.1°,and all of systematic and random error was within 1.0°. The errors of patient positioning with the Y and Z directionshave generally been mainly higher than the X direction. The percentage in treatment fractions in less than 2°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 evenlonger as the length of treatment region. The patient-specific characters should be considered for the accuracyand reproducibility of treatment and it is necessary to confirm periodically the rotational errors, including patientrepositioning and repeating MVCT scan.
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