ArticleJournal of contemporary brachytherapy2026
Geometric accuracy of applicator and needle reconstruction in gynecological brachytherapy using low-field magnetic resonance imaging.
Article in Journal of contemporary brachytherapy, 2026. 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
Purpose: To evaluate the geometric accuracy of applicator reconstruction in gynecological brachytherapy using low-field magnetic resonance imaging. Material and methods: A 0.55T magnetic resonance (MR) scanner was used in this study. First, accuracy of needle reconstruction based on MR and computed tomography (CT) images were compared. Seven plastic needles were inserted into three phantoms, which were scanned with MR and CT. Five observers determined tip and entry points of the needles on both types of images. Needle lengths and tip coordinates were compared. Then, inter-observer variation in localization of applicator and needle tips in patients was evaluated on MR images. Twenty fractions of eleven patients treated with Venezia applicator with needles were selected. In tandem and ovoid tubes, MR markers were inserted, with only air in the needles. Differences between observers in determining the coordinates were depicted using standard deviation (SD). Results: The mean difference between needle depths was 1.16 ±0.8 mm measured on MR and CT images. Uncertainties among observers in determining the position of tips were generally small, with SD of less than 1.0 mm for both imaging modalities. A good correlation ( Conclusions: The 0.55T MR scanner can provide clinically acceptable accuracy in the reconstruction of brachytherapy (BT) applicators and needles. MR markers allow greater precision in determining the tips of applicators. The accuracy of reconstruction using MR images is comparable to that achieved with CT images.
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