Application of low-dose iterative reconstruction technique for radiotherapy localization images(PDF)
《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]
- Issue:
- 2020年第2期
- Page:
- 145-152
- Research Field:
- 医学放射物理
- Publishing date:
Info
- Title:
- Application of low-dose iterative reconstruction technique for radiotherapy localization images
- Author(s):
- YIN Xujun; WANG Xin; LI Xia’nan; CHEN Yalin
- Department of Radiotherapy, Peking University People’s Hospital, Beijing 100044, China
- Keywords:
- Keywords: low-dose iterative reconstruction; radiotherapy; localization image
- PACS:
- R811.1；R318
- DOI:
- DOI:10.3969/j.issn.1005-202X.2020.02.003
- Abstract:
- Abstract: Objective To discuss the feasibility of a new low-dose iterative reconstruction (IR) technique for radiotherapy localization images. Methods Computed tomography (CT) radiation doses were analyzed based on the experimental data of a phantom. The quality evaluation parameters such as CT value, low-contrast resolution, noise, uniformity and geometric distortion of IR images were quantitatively analyzed. Additionally, an anthropomorphic phantom was scanned and reconstructed with IR technique, and then simulated dose calculations for the anthropomorphic phantom were conducted in the treatment planning system. The absolute dose of the volume of interest and the Gamma passing rates of the plane doses were analyzed. Results Low-dose IR technique ensured image quality while reducing CT radiation dose by about 60%. When the tube voltage remains constant, the effect of IR on the accuracy of TPS calculations was negligible; the maximum dose difference of the volume of interest was 0.6%; and the Gamma passing rates of the plane doses were higher than 99.82%. Low-dose IR technique had a certain effect on the low-contrast resolution of images, and the effects needed to be further analyzed based on clinical images. Conclusion Low-dose IR technique can be applied to radiotherapy localization images, but the changes in image features and some image quality indexes need to be paid attention to. The target areas should be determined by low-dose IR technique combined with PET-CT, ultrasound, magnetic resonance imaging and other examinations.
Last Update: 2020-03-03