ArticleJournal of contemporary brachytherapy2026
Dosimetric impact of computed tomography slice thickness-induced applicator reconstruction uncertainties in three-dimensional brachytherapy for cervical cancer.
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 impact of computed tomography (CT) slice thickness on reconstruction accuracy of high-density tandem-ovoid applicators and resulting dose deviations in cervical cancer brachytherapy. Material and methods: Seventeen cervical cancer patients treated with CT-based brachytherapy using stainless steel tandem-ovoid applicators (2.50 mm slice thickness) were retrospectively analyzed. Homologous 0.625 mm, 1.25 mm, and 5.00 mm image sets were reconstructed from original CT raw data. Applicators were reconstructed on each thickness, and treatment plans from 2.50 mm images were copied to other sets. Applicator displacements, reconstruction uncertainties, and dose deviations at 1.25 mm, 2.50 mm, and 5.00 mm were compared with a 0.625 mm reference. Results: Slice thickness-induced partial volume effect caused applicator reconstruction uncertainties, predominantly in superior-inferior ovoid displacements, with maximum uncertainties approaching slice thickness. Each 1 mm superior-inferior displacement caused high-risk clinical target volume (HR-CTV) D Conclusions: CT slice thickness ≥ 2.50 mm introduces significant reconstruction inaccuracies, leading to clinically relevant dose deviations for HR-CTV and rectum. Reconstructing both 0.625 mm (for applicator reconstruction) and 2.50 mm (for contouring) images from a single scan is recommended for high-density applicator brachytherapy.
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