TY - JOUR
T1 - Improved centric phase encoding orders for three-dimensional magnetization-prepared MR angiography
AU - Wilman, Alan H.
AU - Riederer, Stephen J.
PY - 1996/9
Y1 - 1996/9
N2 - New centric phase encoding orders are introduced for transient state three-dimensional MR imaging. Unlike previous centric orders, these variants are not fixed with respect to differences in the relative y and z fields of view, but are tailored to account for the differential degrees of gradient dephasing in the k(y) and k(z) phase encoding directions and thus maintain the highest weighting for the most central k-space values. The new centric orders are compared with previous methods in both simulation and experimental magnetizationprepared MR angiography of the carotid and renal arteries. In comparison with other tested centric orders, the new methods provided better retention of true vessel shape caused by isotropic blurring across the phase encoding plane. In addition, the new methods provided increased contrast, with the degree of improvement over previous methods depending on vessel orientation, size, and degree of inflow.
AB - New centric phase encoding orders are introduced for transient state three-dimensional MR imaging. Unlike previous centric orders, these variants are not fixed with respect to differences in the relative y and z fields of view, but are tailored to account for the differential degrees of gradient dephasing in the k(y) and k(z) phase encoding directions and thus maintain the highest weighting for the most central k-space values. The new centric orders are compared with previous methods in both simulation and experimental magnetizationprepared MR angiography of the carotid and renal arteries. In comparison with other tested centric orders, the new methods provided better retention of true vessel shape caused by isotropic blurring across the phase encoding plane. In addition, the new methods provided increased contrast, with the degree of improvement over previous methods depending on vessel orientation, size, and degree of inflow.
KW - MR angiography
KW - centric phase encode order
KW - magnetization preparation
UR - http://www.scopus.com/inward/record.url?scp=0029763248&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0029763248&partnerID=8YFLogxK
U2 - 10.1002/mrm.1910360309
DO - 10.1002/mrm.1910360309
M3 - Article
C2 - 8875408
AN - SCOPUS:0029763248
SN - 0740-3194
VL - 36
SP - 384
EP - 392
JO - Magnetic Resonance in Medicine
JF - Magnetic Resonance in Medicine
IS - 3
ER -