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.