Standard orientation of the pelvis: Validation on a model and ten patients
2005 (English)In: Acta Radiologica, ISSN 0284-1851, E-ISSN 1600-0455, Vol. 46, no 1, 74-82 p.Article in journal (Refereed) Published
Purpose: To validate an image post-processing method for re-orienting the pelvis in CT volumes to a standardized orientation in a model and in 10 patients. Material and Methods: Twenty-four CT volumes of a pelvic model and 10 pairs of postoperative total hip arthroplasty (THA) patient CT scans were rotated to a defined pelvic standard orientation and the rotation was recorded. For precision, a test-retest procedure was used. For accuracy, three exactly represented coordinate points were used. For clinical application, the standard orientation was used for calculating the direction of acetabular cup migration from a previous model study. Results: Precision of pelvic standard orientation, calculated as maximal directional error, was better than 1degrees in the model study and better than 1.5degrees in the patient study. Accuracy, expressed as angle between ideal and measured coordinate axes, was 0.1degrees for x, y, z axes. No measurable systematic errors were found. When applied to acetabular cup migration in the model, standardization of pelvic orientation had no significant effect on the measurements. Conclusion: Reorienting the pelvis during image post-processing was shown to be accurate. It enables measurements relative to the pelvis and minimizes the dependency of patient positioning.
Place, publisher, year, edition, pages
London, UK: Informa Healthcare, 2005. Vol. 46, no 1, 74-82 p.
CT, hip, arthroplasty, total hip-arthroplasty, acetabular component migration, semiautomated program, computed-tomography, ct, fusion, cup, anteversion, alignment
Radiology, Nuclear Medicine and Medical Imaging
Research subject SRA - ICT
IdentifiersURN: urn:nbn:se:kth:diva-14561DOI: 10.1080/02841850510016063ISI: 000227276400012OAI: oai:DiVA.org:kth-14561DiVA: diva2:332602
QC 201005252010-08-052010-08-052013-09-09Bibliographically approved