Journal of Rehabilitation Research & Development (JRRD)

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Volume 50 Number 1, 2013
   Pages 31 — 42

Abstract — Examination of anticipated chemical shift and shape distortion effect on materials commonly used in prosthetic socket fabrication when measured using MRI: A validation study

Mohammad Reza Safari, PhD;1–2* Philip Rowe, PhD;2 Arjan Buis, PhD2
1Department of Orthotics and Prosthetics, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran; 2Department of Bioengineering, University of Strathclyde, Glasgow, United Kingdom

Abstract — The quality of lower-limb prosthetic socket fit is influenced by shape and volume consistency during the residual limb shape-capturing process (i.e., casting). Casting can be quantified with magnetic resonance imaging (MRI) technology. However, chemical shift artifact and image distortion may influence the accuracy of MRI when common socket/casting materials are used. We used a purpose-designed rig to examine seven different materials commonly used in socket fabrication during exposure to MRI. The rig incorporated glass marker tubes filled with water doped with 1 g/L copper sulfate (CS) and 9 plastic sample vials (film containers) to hold the specific material specimens. The specimens were scanned 9 times in different configurations. The absolute mean difference of the glass marker tube length was 1.39 mm (2.98%) (minimum = 0.13 mm [0.30%], maximum = 5.47 mm [14.03%], standard deviation = 0.89 mm). The absolute shift for all materials was <1.7 mm. This was less than the measurement tolerance of +/–2.18 mm based on voxel (three-dimensional pixel) dimensions. The results show that MRI is an accurate and repeatable method for dimensional measurement when using matter containing water. Additionally, silicone and plaster of paris plus 1 g/L CS do not show a significant shape distortion nor do they interfere with the MRI image of the residual limb.

Key words: accuracy, casting, chemical shift, MRI, prosthesis, prosthetic socket, residual limb, residual limb volume, shape distortion, socket material.


View HTML  ¦  View PDF  ¦  Contents Vol. 50, No. 1
This article and any supplemental material should be cited as follows:
Safari MR, Rowe P, Buis A. Examination of anticipated chemical shift and shape distortion effect on materials commonly used in prosthetic socket fabrication when measured using MRI: A validation study. J Rehabil Res Dev. 2013;50(1):31–42.
http://dx.doi.org/10.1682/JRRD.2011.09.0159
ResearcherID: Mohammad Reza Safari, PhD: A-7999-2013; Philip Rowe, PhD: A-8814-2013; Arjan Buis, PhD: A-8118-2013
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