Moving-Table MR Angiography of the Peripheral Runoff Vessels: Comparison of Body Coil and Dedicated Phased Array Coil Systems
A. Huber1,
J. Scheidler1,
B. Wintersperger1,
A. Baur1,
M. Schmidt2,
M. Requardt2,
N. Holzknecht1,
T. Helmberger1,
A. Billing3 and
M. Reiser1
1 Department of Clinical Radiology, Klinikum der LMU, Großhadern,
Marchioninistr. 15, 81377 München, Germany.
2 Siemens AG, Medizintechnik, Henkestr. 127, 91052 Erlangen, Germany.
3 Department of Surgery, Klinikum der LMU, Großhadern, 81377 München,
Germany.
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Fig. 1. —Drawing shows dedicated surface coil with flexible wings for
upper and lower leg combined with body phased array coil for pelvic
region.
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Fig. 2A. —Maximum-intensity-projection reconstructions of subtracted
data sets with moving-table MR angiography using body coil technique in
64-year-old man with peripheral arterial occlusive disease. MR angiogram of
pelvic region reveals occlusion of right (small arrow) and left
superficial femoral arteries. MR angiogram shows patent bypass graft
(large arrow) in left upper leg.
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Fig. 2B. —Maximum-intensity-projection reconstructions of subtracted
data sets with moving-table MR angiography using body coil technique in
64-year-old man with peripheral arterial occlusive disease. MR angiogram of
upper leg reveals reconstitution of right superficial femoral artery
(small arrow) and distal anastomosis of bypass graft (large
arrow).
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Fig. 2C. —Maximum-intensity-projection reconstructions of subtracted
data sets with moving-table MR angiography using body coil technique in
64-year-old man with peripheral arterial occlusive disease. MR angiogram of
lower leg reveals three patent arteries in right lower leg. Three patent
arteries are visualized in left proximal lower leg (arrowheads), and
anterior tibial artery (arrow) is also visualized in distal left
lower leg. Image quality is decreased by low signal-to-noise ratio.
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Fig. 3A. —Maximum-intensity-projection reconstructions of subtracted
data sets with moving-table MR angiography using phased array surface coil
technique in 52-year-old woman with peripheral arterial occlusive disease. MR
angiogram of iliac arteries shows no hemodynamically significant stenosis or
occlusion of iliac arteries and proximal arteries of upper legs.
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Fig. 3B. —Maximum-intensity-projection reconstructions of subtracted
data sets with moving-table MR angiography using phased array surface coil
technique in 52-year-old woman with peripheral arterial occlusive disease. MR
angiogram of upper leg shows higher signal-to-noise ratio than MR angiogram of
upper leg examined with body coil technique. Right tibiofibular trunk shows
hemodynamically significant stenosis (arrowhead).
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Fig. 3C. —Maximum-intensity-projection reconstructions of subtracted
data sets with moving-table MR angiography using phased array surface coil
technique in 52-year-old woman with peripheral arterial occlusive disease. MR
angiogram of lower leg reveals higher signal-to-noise ratio than MR angiogram
of lower leg examined with body coil technique. Right tibiofibular trunk shows
hemodynamically significant stenosis (arrowhead). Superficial lower
leg veins already show contrast enhancement (arrows); however, deep
lower leg veins show no contrast enhancement.
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Fig. 4A. —Comparison of moving-table MR angiography with phased array
surface coil technique and digital subtraction angiography (DSA) in
69-year-old man with peripheral arterial occlusive disease. DSA of pelvic
region reveals kinking of left iliac arteries and occlusion (arrow)
of right superficial femoral artery.
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Fig. 4B. —Comparison of moving-table MR angiography with phased array
surface coil technique and digital subtraction angiography (DSA) in
69-year-old man with peripheral arterial occlusive disease. DSA of proximal
upper legs reveals occlusion of right upper leg artery and three stenoses
(arrow) of left superficial femoral artery.
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Fig. 4C. —Comparison of moving-table MR angiography with phased array
surface coil technique and digital subtraction angiography (DSA) in
69-year-old man with peripheral arterial occlusive disease. DSA of distal
upper legs reveals reconstitution of right popliteal artery (arrow)
by small collateral vessels (arrowhead).
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Fig. 4D. —Comparison of moving-table MR angiography with phased array
surface coil technique and digital subtraction angiography (DSA) in
69-year-old man with peripheral arterial occlusive disease. DSA of proximal
lower leg reveals only one patent artery on each side of anterior tibial
artery. Left anterior tibial artery shows stenosis at its origin, which may be
confused with cortical bone artifact (arrowhead).
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Fig. 4E. —Comparison of moving-table MR angiography with phased array
surface coil technique and digital subtraction angiography (DSA) in
69-year-old man with peripheral arterial occlusive disease. DSA of distal
lower legs reveals patent anterior tibial arteries down to ankle joint
(arrows).
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Fig. 4F. —Comparison of moving-table MR angiography with phased array
surface coil technique and digital subtraction angiography (DSA) in
69-year-old man with peripheral arterial occlusive disease. MR angiogram of
pelvic region reveals kinking of left iliac arteries and occlusion
(arrow) of right superficial femoral artery.
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Fig. 4G. —Comparison of moving-table MR angiography with phased array
surface coil technique and digital subtraction angiography in 69-year-old man
with peripheral arterial occlusive disease. MR angiogram of upper leg reveals
occlusion of right superficial femoral artery and three stenoses of left
superficial femoral artery (large arrow), reconstitution of right
popliteal artery by small collateral vessels (small arrow), and
stenosis (arrowhead) at origin of left anterior tibial artery.
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Fig. 4H. —Comparison of moving-table MR angiography with phased array
surface coil technique and digital subtraction angiography in 69-year-old man
with peripheral arterial occlusive disease. MR angiogram of lower legs reveals
patent anterior tibial arteries down to ankle joint (arrows).
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Fig. 5. —Bar chart shows mean contrast-to-noise ratios obtained with
body-coil and phased array coil techniques before (white bars) and
after (gray bars) subtraction. Similar values were found for pelvic
region. However, significant difference was found between two coil techniques
and between subtracted and unsubtracted data sets in upper and lower leg.
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Fig. 6A. —62-year-old man with peripheral arterial occlusive disease.
Comparison of maximum-intensity-projection (MIP) reconstructions of
unsubtracted and subtracted data sets obtained with contrast-enhanced MR
angiogram and dedicated surface coil technique. MIP reconstruction of
unsubtracted data sets shows occlusion (arrow) of right superficial
femoral artery.
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Fig. 6B. —62-year-old man with peripheral arterial occlusive disease.
Comparison of maximum-intensity-projection (MIP) reconstructions of
unsubtracted and subtracted data sets obtained with contrast-enhanced MR
angiogram and dedicated surface coil technique. MIP reconstruction of
subtracted data sets shows occlusion (arrow) of right superficial
femoral artery, and small collateral vessels can be detected because of higher
contrast-to-noise ratio than in A.
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Fig. 6C. —62-year-old man with peripheral arterial occlusive disease.
Comparison of maximum-intensity-projection (MIP) reconstructions of
unsubtracted and subtracted data sets obtained with contrast-enhanced MR
angiogram and dedicated surface coil technique. MIP reconstruction of
unsubtracted data sets shows three lower leg arteries with limited
contrast-to-noise ratio.
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Fig. 6D. —62-year-old man with peripheral arterial occlusive disease.
Comparison of maximum-intensity-projection (MIP) reconstructions of
unsubtracted and subtracted data sets obtained with contrast-enhanced MR
angiogram and dedicated surface coil technique. MIP reconstruction of
subtracted data set of three lower leg arteries shows superior image quality
due to higher contrast-to-noise ratio of subtracted data set.
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Copyright © 2003 by the American Roentgen Ray Society.
