| Aneurysm clips: evaluation of magnetic field interactions and translational attraction by use of "long-bore" and "short-bore" 3.0-T MR imaging systems. | |
| | |
MedLine Citation:
|
PMID: 12637298 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
BACKGROUND AND PURPOSE: The use of 3.0-T MR systems is increasing worldwide. We evaluated magnetic field interactions and translational attraction for 32 aneurysm clips in association with exposure to "long-bore" and "short-bore" 3.0-T MR imaging systems. METHODS: Thirty-two different aneurysm clips were evaluated in this investigation. Each aneurysm clip was qualitatively evaluated for magnetic field interactions and quantitatively assessed for translational attraction by using the deflection angle test. The deflection angle tests were performed at the points of the highest spatial gradients for long-bore and short-bore 3.0-T MR imaging systems. RESULTS: Seventeen of the 32 aneurysm clips showed positive magnetic field interactions. Deflection angles for the aneurysm clips were significantly (P <.001) higher on the short-bore (range, 0-18 degrees) compared with those recorded on the long-bore (range, 0-16 degrees) 3.0-T MR imaging system. Aneurysm clips made from commercially pure titanium and titanium alloy displayed no translational attraction (n = 15), whereas those made from stainless steel alloy, Phynox, and Elgiloy displayed positive deflection angles (n = 17). CONCLUSION: The 32 different aneurysm clips passed (angle <45 degrees) the deflection angle test by using the long- and short-bore 3.0-T MR imaging systems, indicating that they are safe for patients and other persons in these MR environments (ie, immediate area of MR imaging systems). However, only clips made from the titanium and titanium alloy are entirely safe for patients undergoing MR imaging procedures because of the total lack of magnetic field interactions. The remaining clips require characterization of magnetic field-induced torque. Because of possible differences in the points of the highest spatial gradients for different 3.0-T MR imaging systems, the results are specific to the imaging units and bore designs used in this investigation. |
| | |
Authors:
|
Frank G Shellock; Jean A Tkach; Paul M Ruggieri; Thomas J Masaryk; Peter A Rasmussen |
Related Documents
:
|
18263948 - Magnetic-field-induced dose effects in mr-guided radiotherapy systems: dependence on th... 17497818 - Electrically assisted magnetic recording in multiferroic nanostructures. 18599218 - Quantitative current measurements using scanning magnetoresistance microscopy. 15524968 - Hyperpolarized xenon nuclear spins detected by optical atomic magnetometry. 14984908 - Brainstem encephalitis and acute disseminated encephalomyelitis following mumps. 7997088 - Visualization of subtle contrast-related intensity changes using temporal correlation. |
Publication Detail:
|
Type: Comparative Study; Evaluation Studies; Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
|
Title: AJNR. American journal of neuroradiology Volume: 24 ISSN: 0195-6108 ISO Abbreviation: AJNR Am J Neuroradiol Publication Date: 2003 Mar |
Date Detail:
|
Created Date: 2003-03-14 Completed Date: 2003-06-11 Revised Date: 2008-02-14 |
Medline Journal Info:
|
Nlm Unique ID: 8003708 Medline TA: AJNR Am J Neuroradiol Country: United States |
Other Details:
|
Languages: eng Pagination: 463-71 Citation Subset: IM |
Affiliation:
|
University of Southern California, Los Angeles, Keck School of Medicine and Institute for Magnetic Resonance, Safety, Education, and Research, Los Angeles, CA, USA. |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Electromagnetic Fields
/
adverse effects* Equipment Failure Analysis / methods Equipment Safety / methods Humans Intracranial Aneurysm / surgery* Magnetic Resonance Imaging / contraindications*, methods Surgical Instruments* Titanium |
| Chemical | |
Reg. No./Substance:
|
7440-32-6/Titanium |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Assessment of the collateral function of the circle of Willis: three-dimensional time-of-flight MR a...
Next Document: Hyperacute subarachnoid hemorrhage on T2-weighted MR images.