|
KMID : 1038720150260010006
|
|
Progress in Medical Physics
2015 Volume.26 No. 1 p.6 ~ p.11
|
|
|
Rotation Errors of Breast Cancer on 3D-CRT in TomoDirect
|
|
Jung Jae-Hong
Cho Kwang-Hwan
Moon Seong-Kwon
Bae Sun-Hyun
Min Chul-Kee
Kim Eun-Seog
Yeo Seung-Gu
Choi Jin-Ho
Jung Joo-Yong
Choe Bo-Young
Suh Tae-Suk
|
|
|
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°, 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 directions have 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 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.
|
|
|
KEYWORD
|
|
|
Breast cancer, Setup error, Rotation error, MVCT
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
 
|
|