Managing Postoperative Artifacts on Computed Tomography and Magnetic Resonance Imaging
| Autor: | Jason M Ford, Kenneth A. Buckwalter, Chen Lin |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Interventional magnetic resonance imaging
ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION Iterative reconstruction Reconstruction filter law.invention Postoperative Complications law Image Interpretation Computer-Assisted Eddy current Humans Medicine Radiology Nuclear Medicine and imaging Orthopedics and Sports Medicine Computer vision Musculoskeletal Diseases Postoperative Period Projection (set theory) medicine.diagnostic_test business.industry Orientation (computer vision) Magnetic resonance imaging Prostheses and Implants Magnetic Resonance Imaging Metals Artificial intelligence Tomography Artifacts Tomography X-Ray Computed Nuclear medicine business |
| Zdroj: | Seminars in Musculoskeletal Radiology. 15:309-319 |
| ISSN: | 1098-898X 1089-7860 |
| Popis: | Orthopedic hardware should not be considered a contraindication to computed tomography (CT) or magnetic resonance (MR) imaging. The hardware alloy, the geometry of the hardware, and the orientation of the hardware all affect the magnitude of image artifacts. For commonly encountered alloys, the severity of image artifacts is similar for CT and MR. Cobalt chrome or stainless steel hardware produces the most artifacts; titanium hardware produces the least. In general, image artifacts are most severe adjacent to the hardware. CT image artifacts are related to incomplete X-ray projection data resulting in streaks. These can be mitigated by increasing scan technique and using a smoother reconstruction filter. Hardware with a rectangular cross-sectional shape such as a fixation plate will cause more artifacts than a radially symmetrical device such as an intramedullary nail. Image artifacts at MR are caused by the hardware magnetic susceptibility and the induction of eddy currents within the metal. A turbo spin-echo sequence yields the best results. The use of larger image matrices, thinner slices, and a wide receiver bandwidth are recommended parameter adjustments when imaging patients with hardware. This article discusses how hardware-related artifacts can be minimized by altering scan technique and image reconstruction. |
| Databáze: | OpenAIRE |
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