TY - JOUR
T1 - Signal targeting with alternating radiofrequency (STAR) sequences
T2 - Application to MR angiography
AU - Edelman, Robert R.
AU - Siewert, Bettina
AU - Adamis, Mary
AU - Gaa, Jochen
AU - Laub, Gerhard
AU - Wielopolski, Piotr
PY - 1994/2
Y1 - 1994/2
N2 - We describe a time of flight subtraction method for cine MR angiography that provides nearly perfect suppression of background signal intensity with excellent flow contrast. The method consists of a preparation phase, during which the longitudinal magnetization of the target tissue is inverted on alternate acquisitions and the background tissue is presaturated, followed by a readout phase using a cine segmented turboFLASH sequence with a shared echo modification to improve temporal resolution. With appropriate alternation of the phases of the radiofrequency excitation pulses, there is cancellation of the background signal intensity but flow signal is optimized. By using a thick section (up to 25 mm), substantial portions of the vascular territory are encompassed in a single plane. This permits rapid, dynamic assessment of flow patterns in areas such as the circle of Willis, carotid bifurcation, or renal arteries. Applications of the method for bright and dark blood cine MR angiography are demonstrated.
AB - We describe a time of flight subtraction method for cine MR angiography that provides nearly perfect suppression of background signal intensity with excellent flow contrast. The method consists of a preparation phase, during which the longitudinal magnetization of the target tissue is inverted on alternate acquisitions and the background tissue is presaturated, followed by a readout phase using a cine segmented turboFLASH sequence with a shared echo modification to improve temporal resolution. With appropriate alternation of the phases of the radiofrequency excitation pulses, there is cancellation of the background signal intensity but flow signal is optimized. By using a thick section (up to 25 mm), substantial portions of the vascular territory are encompassed in a single plane. This permits rapid, dynamic assessment of flow patterns in areas such as the circle of Willis, carotid bifurcation, or renal arteries. Applications of the method for bright and dark blood cine MR angiography are demonstrated.
UR - http://www.scopus.com/inward/record.url?scp=0028153930&partnerID=8YFLogxK
U2 - 10.1002/mrm.1910310219
DO - 10.1002/mrm.1910310219
M3 - Article
C2 - 8133761
AN - SCOPUS:0028153930
SN - 0740-3194
VL - 31
SP - 233
EP - 238
JO - Magnetic Resonance in Medicine
JF - Magnetic Resonance in Medicine
IS - 2
ER -