This article and any supplementary material should be cited as follows: Safari MR, Rowe P, Buis A. Examination of anticipated chemical shift and shape.

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Presentation transcript:

This article and any supplementary 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. Slideshow Project DOI: /JRRD JSP 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; Philip Rowe, PhD; Arjan Buis, PhD

This article and any supplementary 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. Slideshow Project DOI: /JRRD JSP Aim – Determine whether chemical shift artifact or image distortion occurs as direct result of materials commonly used in prosthetic socket fabrication. – Verify spatial accuracy and repeatability of magnetic resonance imaging (MRI). Relevance – MRI is nonionizing, high-resolution technique that can provide clear distinction between tissues and has been proposed for quantifying soft tissue and bone dimension measurement and volume assessment.

This article and any supplementary 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. Slideshow Project DOI: /JRRD JSP Method Analyzed 7 common prosthetic casting materials: – Silicone. – Silicone gel. – Polyurethane. – Polypropylene. – Pe-lite. – Laminate. – Plaster of paris (POP). Specimens scanned 9 times. Containers were shuffled so that all materials were scanned in all 9 locations, giving data across field of view of MRI.

This article and any supplementary 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. Slideshow Project DOI: /JRRD JSP Results Absolute mean difference of 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. Absolute shift for all materials was <1.7 mm. – This was less than measurement tolerance of ±2.18 mm based on voxel (3-dimensional pixel) dimensions.

This article and any supplementary 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. Slideshow Project DOI: /JRRD JSP Conclusion MRI is accurate and repeatable method for dimensional measurement when using matter containing water. Silicone and POP + 1 g/L CS do not: – Show significant shape distortion. – Interfere with MRI image of residual limb.