Quantitative evaluation of susceptibility and shielding effects of nitinol, platinum, cobalt-alloy, and stainless steel stents

The purpose of this study is to quantitatively estimate the shielding and susceptibility effects of commonly used metallic stents on MR signal. Two experiments were performed using a 3D gradient echo sequence with short TE to image a stent phantom: 1) short TR and high flip angle (contrast enhanced...

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Bibliographic Details
Published in:Magnetic resonance in medicine 2003-05, Vol.49 (5), p.972-976
Main Authors: Wang, Yi, Truong, Thuy N., Yen, Cecil, Bilecen, Deniz, Watts, Richard, Trost, David W., Prince, Martin R.
Format: Article
Language:English
Subjects:
Alloys - adverse effects
Biological and medical sciences
Cobalt - adverse effects
contrast enhanced MRA
Magnetic Resonance Angiography - methods
Medical sciences
Metals - adverse effects
Platinum - adverse effects
RF shielding
Signal Processing, Computer-Assisted
Stainless Steel - adverse effects
stent
Stents - adverse effects
susceptibility
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Summary:The purpose of this study is to quantitatively estimate the shielding and susceptibility effects of commonly used metallic stents on MR signal. Two experiments were performed using a 3D gradient echo sequence with short TE to image a stent phantom: 1) short TR and high flip angle (contrast enhanced MRA parameters), and 2) long TR (TR ≫ T1) and low flip angle. The factor characterizing susceptibility effects was estimated from the signal phase of the first experiment, and then the factor characterizing the shielding effects was derived from the second experiment. Susceptibility induced signal loss was negligible (
ISSN:0740-3194
1522-2594
DOI:10.1002/mrm.10450