Error assessment due to coronary stents in flow-encoded phase contrast MR angiography: a phantom study.
Phase contrast magnetic resonance imaging (PC MRI) is a promising method for assessing coronary flow. MR angiography images in the presence of coronary stents display artifacts because of the metal present in the stent. Using a flow phantom, the goal of this in vitro study was to assess quantitatively the effects of flow dephasing caused by magnetic susceptibility in velocity measurements in a region where the artifact is not visualized in a magnitude image. The results showed that for high velocities, significant errors in measurements exist around the stent, outside the susceptibility artifact visible on a magnitude image. J. Magn. Reson. Imaging 1999;10:899-902.
Lethimonnier
F
F
Department of Nuclear Medicine, The University Hospital of Angers, 49033 Angers Cedex 01, France.
Bouligand
B
B
Thouveny
F
F
Furber
A
A
Jallet
P
P
Caron-Poitreau
C
C
Le Jeune
J J
JJ
D016477:Artifacts; D001783:Blood Flow Velocity; D003326:Coronary Circulation; D003331:Coronary Vessels / Q000473:pathology*; D006801:Humans; D018810:Magnetic Resonance Angiography / Q000379:methods*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D019047:Phantoms, Imaging; D015607:Stents