Accuracy of different image registration methods in image-guided adaptive brachytherapy for cervical cancer.
10.12122/j.issn.1673-4254.2018.11.11
- Author:
Qinghe PENG
1
;
Yinglin PENG
2
;
Jinhan ZHU
2
;
Mingzhan CAI
2
;
Linghong ZHOU
1
Author Information
1. School of Biomedical Engineering, Southern Medical University, Guangzhou 510515, China.
2. Department of Radiation Oncology, Sun Yat-Sen University Cancer Center, State Key Laboratory of Oncology in South China, Guangzhou 510060, China.
- Publication Type:Journal Article
- Keywords:
applicator;
cervical cancer;
image registration;
image-guided adaptive brachytherapy
- MeSH:
Brachytherapy;
methods;
standards;
Female;
Humans;
Organs at Risk;
diagnostic imaging;
Radiotherapy Dosage;
Radiotherapy Planning, Computer-Assisted;
methods;
standards;
Radiotherapy, Image-Guided;
methods;
standards;
Software;
Tomography, X-Ray Computed;
methods;
standards;
Uterine Cervical Neoplasms;
diagnostic imaging;
radiotherapy
- From:
Journal of Southern Medical University
2018;38(11):1344-1348
- CountryChina
- Language:Chinese
-
Abstract:
OBJECTIVE:To compare the accuracy of different methods for image registration in image-guided adaptive brachytherapy (IGABT) for cervical cancer.
METHODS:The last treatment planning CT images (CT1) and the first treatment planning CT images (CT2) were acquired from 15 patients with cervical cancer and registered with different match image qualities (retained/removed catheter source in images) and different match regions [target only (S Group)/ interested organ structure (M Group)/body (L Group)] in Velocity3.2 software. The dice similarity coefficient (DSC) between the clinical target volumes (CTV) of the CT1 and CT2 images (CTVCT1 and CTVCT2, respectively) and between the organs-at-risk (OAR) of the two imaging datasets (OARCT1 and OARCT2, respectively) were used to evaluate the image registration accuracy.
RESULTS:The auto-segmentation volume of the catheter source using Velocity software based on the CT threshold was the closest to the actual volume within the CT value range of 1700-1800 HU. In the retained group, the DSC for the OARs of was better than or equal to that of the removed group, and the DSC value of the rectum was significantly improved ( < 0.05). For comparison of different match regions, the high-risk target volume (HRCTV) and the low-risk target volume (IRCTV) had the best precision for registration of the target area, which was significantly greater than that of M group and L group ( < 0.05). The M group had better registration accuracy of the target area and the best accuracy for the OARs. The DSC values of the bladder and rectum were significantly better than those of the other two groups ( < 0.05).
CONCLUSIONS:The CT value range of 1700-1800 HU is optimal for automatic image segmentation using Velocity software. Automatic segmentation and shielding the volume of the catheter source can improve the image quality. We recommend the use of interested organ structures regions for image registration in image-guided adaptive brachytherapy for cervical cancer.
