Bart Carelsen, Presenter: Nothing to Disclose

Remmet Jonges, Abstract Co-Author: Nothing to Disclose

Simon D. Strackee, Abstract Co-Author: Nothing to Disclose

Mario Maas MD, Abstract Co-Author: Nothing to Disclose

Patricia van Kemenade PhD, Abstract Co-Author: Nothing to Disclose

Marcel van Herk PhD, Abstract Co-Author: Nothing to Disclose

Geert J. Streekstra PhD, Abstract Co-Author: Nothing to Disclose

et al, Abstract Co-Author: Nothing to Disclose

et al, Abstract Co-Author: Nothing to Disclose

To understand the functioning of the wrist joint, the availability of dynamic 3D motion patterns of the carpal bones of the wrist joint is essential. We introduce a method for measurement of dynamic in vivo carpal motion patterns. The method consists of 4D-RX imaging with improved image quality and image processing for accurate detection of in vivo wrist motion patterns.

Dynamic 3D imaging yields a number of volume reconstructions of the wrist at different phases of its cyclic motion. In this setup 20 dynamic 3D carpal reconstructions are obtained in 80 seconds and a complementary static scan is acquired (in 30 s) with a mobile C-arm X-ray system. Next, the carpal reconstructions are registered to their static acquired and segmented counterpart in all phases. With this information the relation between the applied motion and carpal kinematic behavior is acquired, i.e. the motion patterns. We investigated the precision of the image acquisition and dedicated processing and tested the method on 3 healthy subjects.

The precision of the image acquisition and image processing is 0.2 mm for translation and 0.5 degrees. The measurements of 3 healthy human volunteers agree for the greater part with previous done invasive and non dynamic measurements. Variation of the applied load to a wrist yielded a detectable difference in hysteresis within the motion pattern. The segmented carpals combined with the obtained motion patterns were used to visualize carpal motion in an appealing way.

We developed a method, based on 4D-RX imaging with accompanying image processing for accurate in vivo carpal dynamic motion pattern measurements. In vivo motion pattern measurement with 4D-RX imaging and processing is, fast, accurate, and non-invasive. This technique is useful to establish relationships between motion patterns and wrist disorders and potentially a valuable tool for diagnosis.

We present a method for accurate and fast determination of carpal motion patterns based on 4D-RX imaging and image processing.

Carelsen, B, Jonges, R, Strackee, S, Maas, M, van Kemenade, P, van Herk, M, Streekstra, G, et al, , et al, , Measurement of in Vivo Dynamic 3D Motion Patterns in the Wrist Joint.  Radiological Society of North America 2007 Scientific Assembly and Annual Meeting, November 25 - November 30, 2007 ,Chicago IL. http://archive.rsna.org/2007/5010701.html