Standard orientation of the pelvis: validation on a model and ten patients
| Autor: | Henrik Olivecrona, Peter Aspelin, Lotta Olivecrona, Gerald Q. Maguire Jr., Michael P. Zeleznik, Andreas Stark, Lars Weidenhielm, Marilyn E. Noz, Lars Svensson |
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| Rok vydání: | 2005 |
| Předmět: |
Adult
Male Models Anatomic Arthroplasty Replacement Hip medicine.medical_treatment Posture Image processing 030218 nuclear medicine & medical imaging 03 medical and health sciences 0302 clinical medicine Image Processing Computer-Assisted medicine Humans Radiology Nuclear Medicine and imaging Pelvic Bones Pelvis Aged Aged 80 and over Radiological and Ultrasound Technology business.industry Orientation (computer vision) Reproducibility of Results General Medicine Middle Aged Arthroplasty Patient study medicine.anatomical_structure 030220 oncology & carcinogenesis Hip bone Female Hip Joint Tomography business Nuclear medicine Tomography Spiral Computed Rotation (mathematics) |
| Zdroj: | Acta Radiologica. 46:74-82 |
| ISSN: | 1600-0455 0284-1851 |
| Popis: | 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 1° in the model study and better than 1.5° in the patient study. Accuracy, expressed as angle between ideal and measured coordinate axes, was 0.1° 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. |
| Databáze: | OpenAIRE |
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