Preliminary results of MRI-guided brachytherapy in cervical carcinoma: The Chiangmai university experience

• Main Authors: Ekkasit Tharavichitkul, Chate Sivasomboon, Somsak Wanwilairat, Vicharn Lorvidhaya, Vimol Sukthomya, Somvilai Chakrabhandu, Sanchai Lookkaew, Imjai Chitapanarux, Razvan Galalae
• Format: Journal
• Published: 2018
• Subjects: Environmental Science; Medicine; Physics and Astronomy
• Online Access: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84863500685&origin=inward; http://cmuir.cmu.ac.th/jspui/handle/6653943832/51693
• Institution: Chiang Mai University

This study was performed to evaluate the feasibility of magnetic resonance imaging (MRI) in the treatment planning of image-guided brachytherapy for cervical carcinoma. Seventeen consecutive patients with locally advanced cervical cancer were enrolled in the study. Fifteen patients could be evaluated. When comparing the tumor at diagnosis (GTV-Dx) and the tumor at the first brachytherapy (GTV-BT), 11 of 15 patients showed a tumor regression of more than 80% while only four patients had less than 80% tumor regression. The mean D90 of HR-CTV and the calculated D2cc of the bladder, rectum, and sigmoid were 99.2 ± 11 Gy, 87.7 ± 5.7 Gy, 68.4 ± 5.4 Gy and 70.3 ± 6.8 Gy, respectively. No grade 3-4 acute toxicity was observed. The MRI can be a valuable tool for evaluating tumor response after external beam radiotherapy (EBRT) and is very helpful for prognosis prediction by residual GTV evaluation. Furthermore, MRI-guided brachytherapy allowed us to optimize the dose for both the target volumes and the OARs.