Precision of determining bone pose and marker position in the foot and lower leg from computed tomography scans

How low can we go in radiation dose?

Journal article (2019)

Authors

Wouter Schallig Universiteit van Amsterdam, Vrije Universiteit Amsterdam

Josien C. van den Noort Vrije Universiteit Amsterdam, Universiteit van Amsterdam

Roeland P. Kleipool Universiteit van Amsterdam

Johannes G.G. Dobbe Universiteit van Amsterdam

Marjolein M. van der Krogt Vrije Universiteit Amsterdam

M. M. van der Krogt Vrije Universiteit Amsterdam

J. Harlaar Biomechatronics & Human-Machine Control - Mechanical, Maritime and Materials Engineering , Vrije Universiteit Amsterdam

Jaap Harlaar Biomechatronics & Human-Machine Control - Mechanical, Maritime and Materials Engineering , Vrije Universiteit Amsterdam

M. Maas Universiteit van Amsterdam

Geert J. Streekstra Universiteit van Amsterdam

Research Group

Biomechatronics & Human-Machine Control (Mechanical, Maritime and Materials Engineering) (TU Delft)

DOI: https://doi.org/10.1016/j.medengphy.2019.05.004

Segmentation Registration Biomechanics Foot Computed tomography Dose reduction Movement analysis Skin-mounted markers

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Published Date

2019

Language

English

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Faculty

Mechanical, Maritime and Materials Engineering

Department

Biomechanical Engineering

Research Group

Biomechatronics & Human-Machine Control

Abstract

Computed tomography (CT) imaging can be used to determine bone pose, sometimes combined with skin-mounted markers. For this specific application, a lower radiation dose than the conventional clinical dose might suffice. This study aims to determine how lowering the radiation dose of a CT-scan of the ankle and foot affects the precision of detecting bone pose and marker position. Radiation dose is proportional to tube charge. Hence, an adult cadaveric leg was scanned 10 times at four different tube charges (150, 75, 50 and 20 mAs) with a Philips Brilliance 64 CT scanner. Precision of detecting bone and marker position at 50 mAs was not significantly different from 75 mAs and from the clinically used 150 mAs, but higher than 20 mAs. Furthermore, no differences of the precision in detecting bone orientation were found. These results indicate that the radiation dose can be reduced by a factor 3 compared to the clinically usual radiation dose, without affecting the precision of detecting bone pose and marker position in the foot and ankle.

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