Precision and accuracy of computed tomography foot measurements

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Presentation transcript:

Precision and accuracy of computed tomography foot measurements Kirk E. Smith, AAS, Paul K. Commean, BEE, Douglas D. Robertson, MD, PhD, Thomas Pilgram, PhD, Michael J. Mueller, PT, PhD Archives of Physical Medicine and Rehabilitation Volume 82, Issue 7, Pages 925-929 (July 2001) DOI: 10.1053/apmr.2001.23894 Copyright © 2001 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions

Fig. 1 (A) A reconstructed CT slice taken near the center of the phantom is shown. The white circles are cross sections of the Delrin rods, which are parallel to each other. Delrin is a bone surrogate material. The image appears blurred at the bone-soft tissue interfaces because of a 3-mm collimation of the radiograph source. This corresponds to a top view of the phantom as it was scanned in the CT scanner. (B) The soft-tissue portion of the phantom is shown as a 3-dimensional shaded model from the CAD design. The Delrin rods were press fit into the holes to complete the phantom. All measurements are in millimeters. Archives of Physical Medicine and Rehabilitation 2001 82, 925-929DOI: (10.1053/apmr.2001.23894) Copyright © 2001 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions

Fig. 2 A 3-dimensional volumetric rendering of a cadaver foot. The small bumps in the image are the radiopaque markers attached to the surface of the skin. A cut-away of the foot reveals the underlying tissues. A volumetric model can be sliced in any direction to show tissues of interest. Archives of Physical Medicine and Rehabilitation 2001 82, 925-929DOI: (10.1053/apmr.2001.23894) Copyright © 2001 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions

Fig. 3 The cadaver feet were sectioned through 3 markers attached at the forefoot and the corresponding plane was exposed. Five measurements, m1 to m5, were recorded. A corresponding image was reconstructed from the CT data and similar measurements were recorded. Archives of Physical Medicine and Rehabilitation 2001 82, 925-929DOI: (10.1053/apmr.2001.23894) Copyright © 2001 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions

Fig. 4 A surface model, generated from CT data, was used to build a physical replica of a foot (left). The cadaver foot is shown for comparison (right). The small bumps on the physical replica correspond to 1.5-mm lead spheric markers that were attached to the cadaver foot. Archives of Physical Medicine and Rehabilitation 2001 82, 925-929DOI: (10.1053/apmr.2001.23894) Copyright © 2001 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions