Evaluation of rotational set-up errors in patients with thoracic neoplasms
10.3760/cma.j.issn.1004-4221.2010.01.015
- VernacularTitle:胸部肿瘤患者放疗旋转摆位误差分析
- Author:
Yanyang WANG
;
Xiaolong FU
;
Bing XIA
;
Min FAN
;
Huanjun YANG
;
Jun REN
;
Zhiyong XU
;
Guoliang JIANG
- Publication Type:Journal Article
- Keywords:
Thoracic neoplasms/radiotherapy;
Rotational set-up error;
Tomography,X-ray computed,kilovohage cone-beam
- From:
Chinese Journal of Radiation Oncology
2010;19(1):44-46
- CountryChina
- Language:Chinese
-
Abstract:
Objective To assess the rotational set-up errors in patients with thoracic neoplasms. Methods 224 kilovohage cone-beam computed tomography (KVCBCT) scans from 20 thoracic tumor pa-tients were evaluated retrospectively. All these patients were involved in the research of " Evaluation of the residual set-up error for online kilovohage cone-beam CT guided thoracic tumor radiation". Rotational set-up errors, including pitch, roll and yaw, were calculated by 'aligning the KVCBCT with the planning CT, using the semi-automatic alignment method. Results The average rotational set-up errors were -0.28°±1.52°, 0.21°± 0.91° and 0.27°± 0. 78° in the left-fight, superior-inferior and anterior-posterior axis, respective-ly. The maximal rotational errors of pitch, roll and yaw were 3.5°, 2.7° and 2.2°, respectively. After cor-rection for translational set-up errors, no statistically significant changes in rotational error were observed. Conclusions The rotational set-up errors in patients with thoracic neoplasms were all small in magnitude. Rotational errors may not change after the correction for translational set-up errors alone, which should be e-valuated in a larger sample future.
