Zarko Celicanin1, Oliver Bieri1, Klaus Scheffler2, 3, Francesco Santini1
1Division of Radiological Physics, Department of Radiology and Nuclear Medicine, University of Basel Hospital, Basel, Switzerland; 2MRC Department, MPI for Biological Cybernetics, Tbingen, Germany; 3Dept. Neuroimaging and MR-Physics, University of Tbingen, Tbingen, Germany
A spectrally selective pencil-beam navigator method has been recently published for motion compensation of MRgHIFU therapy of abdominal organs. The suggested spectral navigator consisted of a spiral 2D pencil-beam using 1-[-1]-1 binomial pulses and was proposed for the tracking of abdominal organs, such as the liver or kidney, based on the surrounding adipose tissue signal. Here, we present a novel spectrally selective navigator technique based on a spin echo with orthogonal planes for the excitation and refocusing pulses , also called crossed-pair navigator, but using 1-[-1] binomial pulses for excitation and refocusing.