Ultrafast 1D approach for phase or frequency mapping for MRI-based temperature measurement
Oshio K, McDannold N, Hynynen K, Mulkern R, Chen N
Harvard Medical School/Brigham and Women's Hospital
Rapid 1D temperature measurements were achieved by sampling single columns. The columns were excited with a slice selective 90-180 pair and up to 32 echoes were sampled in order to rapidly measure frequency or phase shifts. By using each echo as an individual measurement, 4066 1D temperature measurements were acquired in 40 sec during ultrasound heating in a phantom. It was possible to acquire frequency measurements in the heart of a volunteer. Temperature monitoring of short sonications in moving organs such as the heart may be feasible with this method.