Fixation effect of whole-body fixation plate based on MVCT imageguided technique in craniospinal tomotherapy
10.3781/j.issn.1000-7431.2017.77.105
- Author:
Wenchao ZHU
1
Author Information
1. Department of Radiation Therapy, Zhongshan Hospital, Fudan University
- Publication Type:Journal Article
- Keywords:
Central nervous system neoplasms;
Megavoltage CT;
Setup errors;
Tomotherapy;
Whole-body fixation plate
- From:
Tumor
2017;37(7):710-715
- CountryChina
- Language:Chinese
-
Abstract:
Objective: Application of tomotherapy with megavoltage CT (MVCT)image-guided technique into craniospinal radiotherapy to analyzethe fixation effect of whole-body fixation plate.Methods: A retrospective analysis of 10 cases receiving craniospinalradiotherapy was performed. All patients were in supine position and were fixed with a whole-body fixation plate combined with thermoplastic mesh. The MVCTimages acquired before tomography were matched with the kilovoltage CT (KVCT) images, sothat the setup errors in six directions were detected. The tomography was performed if thematching result was satisfactory, otherwise the patient needed to be setup for the secondtime when the matching result was not accepted by the clinical radiation therapists.Results: A total of 159 MVCT scans was conducted in 10 patients. The average setup errorsin left-right (LR), cranial-caudal (CC), anterior-posterior (AP), pitch, roll and yaw directionswere (1.94 ± 1.44) mm, (2.98 ± 2.51) mm, (1.71 ± 1.87) mm, (0.73 ± 0.64) degrees, (0.30 ±0.26) degrees and (0.34 ± 0.31) degrees, respectively. The probability of second setup was3.14% (5/159).Conclusion: MVCT image-guided technique can significantly reduce the setup errors incraniospinal tomography. The fixation effect of the whole-body fixation plate is acceptable.
