Computed Tomography Images of the Scapula Taken With Reduced Dose Can Yield Segmented Models of Sufficient Accuracy: A Pilot Study

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Abstract

Objective

The aim of the study was to investigate the influence of tube current reduction on the segmentation accuracy of the scapula.

Methods

A human cadaver was computed tomography scanned multiple times while reducing tube current amperage. The images were segmented using 2 different segmentation methods (N = 28). Subsequently the scapula was dissected and all soft tissues were removed. An optical laser scan of the dissected scapula was aligned and compared with the segmented meshes of the different computed tomography scans.

Results

The mesh accuracy remained fairly constant with diminishing tube currents. All segmented meshes had a larger volume than the reference mesh (n = 27). The mean 3-dimensional deviation varied between 1.17 mm (max) and −0.759 mm (min) and the total mean (SD) 3-dimensional deviation was −0.45 (0.38) mm. Radiation dosages were reduced from 7.1 to 0.3 mSv.

Conclusions

Computed tomography tube current can be largely reduced without losing the surface segmentation accuracy of segmented scapula meshes.

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