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Wallstent metallic biliary endoprosthesis: MR imaging characteristics.
M J Girard1, P F Hahn, S Saini
1Department of Radiology, Massachusetts General Hospital, Boston.
Radiology
|September 1, 1992
Summary
Metallic biliary endoprostheses show minimal artifact and no safety concerns during magnetic resonance (MR) imaging. This study confirms their compatibility for MR procedures, ensuring diagnostic quality and patient safety.
Area of Science:
- Medical Imaging
- Biomaterials Science
- Gastroenterology
Background:
- Metallic biliary endoprostheses are widely used.
- Assessing their safety and impact on Magnetic Resonance (MR) imaging is crucial.
Purpose of the Study:
- To evaluate the image quality and safety of commonly used metallic biliary endoprostheses during MR imaging.
- To determine potential artifacts and magnetic susceptibility effects.
Main Methods:
- In vitro testing of endoprostheses at 0.6 and 1.5 Tesla (T).
- Evaluation of MR imaging in eight patients with metallic biliary endoprostheses using conventional pulse sequences and middle-field-strength spin-echo sequences.
Main Results:
- In vitro, endoprostheses showed no tip deflection at 0.6 or 1.5 T.
- Trace magnetic susceptibility artifact, comparable to air, was observed along the stent.
- In patients, minimal image degradation occurred with conventional sequences.
- Middle-field-strength spin-echo images exhibited artifacts indistinguishable from pneumobilia.
Conclusions:
- Metallic biliary endoprostheses demonstrate a good safety profile for MR imaging.
- Minimal artifacts are produced, not significantly compromising diagnostic image quality.
- These findings support the use of MR imaging in patients with these devices.