Novel T*2-weighted contrast preparation scheme for segmented k-space myocardial imaging.
A novel T*(2)-weighted contrast-preparation scheme is described for use with segmented k-space cardiac sequences. This approach frees the imaging phase from the requirement of a long TE and, hence, a relatively long TR. A [90 degrees (x)-tau-90 degrees (rho)] preparation scheme is used to acquire four image data sets with the phase rho of the second pulse set to x, y, -x, and -y. The rho = x raw data is subtracted from the rho = -x data to form the "x" image, with a similar subtraction to generate the "y" image. These images are added in quadrature to obtain the T*(2)-weighted image. The method results in reduced artifact compared to a simple two-image scheme with rho = x, and y. T*(2) was measured in the myocardial septum in six normal volunteers by comparing tau = 7 and 28 ms images, and it was found to be 44 +/- 5 ms at 0.95 T.
Redpath
T W
TW
Department of Bio-Medical Physics and Bio-Engineering, University of Aberdeen, Foresterhill, Aberdeen AB25 2ZD, Scotland, UK. T.Redpath@arh.grampian.scot.nhs.uk
Semple
S I K
SI
Waiter
G D
GD
Frisch
L
L
Norton
M Y
MY
Morris
D M
DM
Egred
M
M
D000328:Adult; D016477:Artifacts; D003287:Contrast Media; D006352:Heart Ventricles / Q000033:anatomy & histology*; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D009200:Myocardial Contraction; D012119:Respiration; D016276:Ventricular Function
D003287:Contrast Media