Correction of distorted digital images generated by radiotherapy simulator
10.3760/cma.j.issn.1004-4221.2009.02.146
- VernacularTitle:模拟定位机图像的数字化及图像畸变校正
- Author:
Qibin SONG
;
Liming XU
;
Weiguo HU
;
Jun ZHANG
;
Chengjun LI
- Publication Type:Journal Article
- Keywords:
Radiotherapy;
Simulation localization machine;
Geometric distortion;
Correction
- From:
Chinese Journal of Radiation Oncology
2009;18(2):146-148
- CountryChina
- Language:Chinese
-
Abstract:
Objective To measure the distortion of digital images generated by radiotherapy simula-tor,and to study the appropriate method of correction. Methods The grid correction plate and Microsoft Visual C + + 6.0 were used for correction. The area error and boundary maximum displacement error of dig-ital images before and after correction were calculated. The post-correction images were compared with film images to evaluate the correction method. Results The area error was 0.31% - 12.36%, and the bounda-ry displacement error was more than 0 -6 mm for 4 cm ×4 cm - 12 cm × 12 cm radiation field before correc-tion. For commonly used radiation field(12 cm × 12 cm) ,the post-correction area error and the boundary displacement error were 0.48% and 0.46 mm,respectively. Conclusions The least square and polynomi-al fitting correction method can fulfill the requirement of conventional radiotherapy.
