Inter-institutional variability in CT-to-mass-density conversion tables for helical tomotherapy: a national survey in Japan.

ABSTRACT: This study evaluates current practices and challenges associated with computed tomography number-to-mass density (CT-MD) conversion tables in helical tomotherapy across Japan and explores directions for standardization and quality improvement amid the increasing adoption of adaptive radiotherapy (ART). A nationwide web-based survey was conducted across 34 institutions utilizing the Radixact system. Data were collected on CT acquisition protocols, calibration phantoms, density plugs, reconstruction algorithms, table registration timing and quality assurance (QA) frequency. Registered CT-MD tables were categorized by CT modality: Simulation CT (SimCT), ClearRT and CTrue. ClearRT tables were analyzed by phantom setup (full vs half), and CTrue tables by reconstruction method [filtered back pro

SUBMITTER: Tsunemine S 

PROVIDER: S-EPMC12648070 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature