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

A Pilot Study

Herteleer, Michiel, MD*; Vancleef, Sanne, MSc; Nijs, Stefaan, MD, PhD*‡; Vander Sloten, Jos, PhD

Journal of Computer Assisted Tomography: May/June 2018 - Volume 42 - Issue 3 - p 448–452
doi: 10.1097/RCT.0000000000000706
Musculoskeletal Imaging
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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.

From the *Organ Systems, KU Leuven, Leuven;

Department of Mechanical Engineering, Division Biomechanical Engineering, Heverlee; and

Traumatology, UZ Leuven, Leuven, Belgium.

Received for publication June 27, 2017; accepted October 24, 2017.

Correspondence to: Michiel Herteleer, MD, Traumatology Herestraat 49, 3000 Leuven, Vlaams-Brabant, Belgium (e-mail: michiel.herteleer@kuleuven.be).

The authors declare no conflict of interest.

The study was approved by Ethical Committee KU Leuven.

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