Determination of T1 by Three-dimensional Measurement with Triangle Excitation
From the time of the first applications of magnetic resonance (MR) to medicine, great interest was shown in the measurement of relaxation parameters. The spin-spin relaxation time T2 of a substance can be relatively simply determined in MR imaging by using Carr-Purcell sequences, at least in the case of only one time constant of the relaxation process. However, measurement of the longitudinal relaxation time T1 is more difficult. The standard method for T1 measurement is the use of inversion recovery sequences. To achieve an accurate result several images with different inversion times are required. The measurement time consequently tends to be very long, and often too long for patient examinations. In this paper a new method for T1 measurement is presented; it is based on a gradient echo technique and allows the collecting of many support points for a T1 calculation within one single measurement.
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