Fluoroscopic Contrast-Enhanced MR Angiography with a Magnetization-Prepared Steady-State Free Precession Technique in Peripheral Arterial Occlusive Disease
Rolf W. Huegli1,
Markus Aschwanden2,
Klaus Scheffler3 and
Deniz Bilecen1
1 Department of Radiology, University Hospital of Basel, Petersgraben 4, 4031
Basel, Switzerland.
2 Department of Angiology, University Hospital of Basel, 4031 Basel,
Switzerland.
3 Medical Physics, Department of Radiology, University Hospital of Basel, 4031
Basel, Switzerland.
View larger version (9K):
[in a new window]
|
Fig. 1A —Diagram illustrates technique used for optimized background
suppression, and graph shows acceptable contrast-to-noise ratios (CNRs) were
obtained. Schematic diagram illustrates magnetization prepared steady-state
free precession (SSFP) technique for intraarterial near-real-time
contrast-enhanced MRI. To gain sufficient background suppression and enhanced
T1 weighting, nonselective excitation pulse of 130° and
frequency-selective fat-saturation pulse were inserted between consecutive 2D
projection acquisitions.
|
|
View larger version (12K):
[in a new window]
|
Fig. 1B —Diagram illustrates technique used for optimized background
suppression, and graph shows acceptable contrast-to-noise ratios (CNRs) were
obtained. Sequential CNR curve progression at thigh and calf levels. First two
acquisitions are discarded and following three images are averaged to create
mask image (nonselective excitation). Slope of CNR curve is steeper and
reaches earlier plateau at thigh level ( ) than calf level (•).
Because contrast medium was injected in both cases at proximal femoral level,
CNR curve is observably higher in femoropopliteal axis.
|
|
View larger version (57K):
[in a new window]
|
Fig. 2A —Complex subtracted intraarterial (IA) near-real-time
contrast-enhanced MRI of 69-year-old man with peripheral arterial occlusive
disease. Acquisition time was 700 milliseconds per frame. Superficial femoral
artery and proximal parts of popliteal artery are clearly delineated. Only
mild venous filling and parenchymal flush can be observed in images h, i, and
j.
|
|
View larger version (115K):
[in a new window]
|
Fig. 2B —Complex subtracted intraarterial (IA) near-real-time
contrast-enhanced MRI of 69-year-old man with peripheral arterial occlusive
disease. Acquisition time was 700 milliseconds per frame. Images a-f show
two-vessel runoff over peroneal and posterior tibial arteries. In images g-j,
mild venous filling and parenchymal flush can be seen.
|
|
View larger version (22K):
[in a new window]
|
Fig. 2C —Complex subtracted intraarterial (IA) near-real-time
contrast-enhanced MRI of 69-year-old man with peripheral arterial occlusive
disease. Acquisition time was 700 milliseconds per frame. Calculated MR road
map image (C) compared with IA digital subtraction angiography (DSA)
image (D). Clear delineation of two-vessel runoff via posterior tibial
and fibular arteries. Stenoses are overestimated on MR image compared with IA
DSA.
|
|
View larger version (47K):
[in a new window]
|
Fig. 2D —Complex subtracted intraarterial (IA) near-real-time
contrast-enhanced MRI of 69-year-old man with peripheral arterial occlusive
disease. Acquisition time was 700 milliseconds per frame. Calculated MR road
map image (C) compared with IA digital subtraction angiography (DSA)
image (D). Clear delineation of two-vessel runoff via posterior tibial
and fibular arteries. Stenoses are overestimated on MR image compared with IA
DSA.
|
|
CiteULike 
Complore 
Connotea 
Del.icio.us 
Digg 
Reddit 
Technorati What's this?
Copyright © 2006 by the American Roentgen Ray Society.
