ArticleSouth Asian journal of cancer2025
Dosimetric Analysis of Computed Tomography-Based Brachytherapy Planning in Carcinoma Cervix.
Article in South Asian journal of cancer, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Background: The standard of care for locally advanced cervical cancer is concurrent chemoradiation followed by intracavitary brachytherapy (BT). BT forms an integral part of management as it improves local control and overall survival. In recent times, image-guided BT (IGBT) has been recommended as the standard of care. Computed tomography (CT) scan-based BT is a cost-effective and easily available modality for IGBT. The aim of the study was to do a dosimetric analysis of CT scan-based BT for patients with cervical cancer. Methods: This was a retrospective study and included patients with cervical cancer treated with radical chemoradiation followed by BT. CT scan was done before every fraction after applicator placement, and CT-based planning was done for all fractions. Clinical details were abstracted from the case records, and dosimetric details were collected from the treatment planning systems. Total equivalent dose in 2 Gy per fraction (EQD2) was calculated for external beam radiation therapy and BT target volumes and organs at risk (OARs). Results: This study included 50 patients. The mean age was 45 years. The majority of the cases were stage III. The mean high-risk clinical target volume (HRCTV) for the 1st, 2nd, and 3rd fraction was 53.1, 52.1, and 51.3 mL, respectively. Mean D90 HRCTV (dose received by 90% of the HRCTV) dose was 81.4 Gy (EQD2 10 Gy) and D2cc was 75.8 Gy (EQD2 3 Gy) for the rectum and sigmoid and 86.2 Gy (EQD2 3 Gy) for the bladder. Conclusion: CT-based BT is a reasonable option in high-volume and low-resource settings where the availability of magnetic resonance imaging is limited. CT-based BT at every fraction can ensure proper applicator placement and aid in optimizing the dose to the target volumes and OARs.
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