Fig. 1.
Data acquired under different pulse sequences or different scanners: (a) An acquisition of a Spoiled Gradient Recalled (SPGR) sequence in GE 3T scanner [16], (b) same subject with Magnetization Prepared Rapid Gradient Echo (MPRAGE) sequence in GE 3T scanner, (c) another subject [12], SPGR, GE 1.5T scanner, (d) same subject with MPRAGE sequence in a Siemens 3.0T scanner. Evidently, tissue contrast is dependent on the choice of pulse sequences, as well as on the choice of scanner. The contrast is intrinsically dependent on the choice of MR acquisition parameters, like flip angle, repetition time, echo time etc.