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Abstract #3408

Spectrally Selective Crossed-Pair Navigator

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.

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Keywords

abdominal accrual accumulate achieved acquisition adipose advance affecting allow allows applications approximately arbitrary artifacts assuming balanced bandwidth beam beneficial bingen binomial biological body called channel characteristics chemical clinical coil compensation completed completely consisted constrained constraints controlled cross crossed cybernetics days defining dept designed diagram division duration errors especially excitation expected extremely field formed free furthermore generally gradient gradients healthy hospital implemented improved indicated inhomogeneities interleaved kidney liver localization located medicine might motion navigator noise novel nuclear nuclei oliver opposite organ organs orthogonal overall pair part pencil phantom physics planning poor positioned positioning precession problems projection proposed protocol providing published pulse pulses radiological radiology readout recently reduction refocusing reported resolution respectively robust running saturation scanners section selected selection selective selectivity separate separation setup shaped shimming simulations slew slice solution spatial spectral spectrally spin spiral stable steady strength successful suggested surface surrounding therapy tissue tracking turns view visceral volunteer water whole