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Med Phys. 2013 Mar;40(3):032304. doi: 10.1118/1.4792672.

Half radiofrequency pulse excitation with a dedicated prescan to correct eddy current effect and gradient delay.

Author information

1
Molecular Imaging Center, National Institute of Radiological Sciences, Inage-ku, Chiba, Japan. takayuki.abe.mri@gmail.com

Abstract

PURPOSE:

To improve the slice profile of the half radiofrequency (RF) pulse excitation and image quality of ultrashort echo time (UTE) imaging by compensating for an eddy current effect.

METHODS:

The dedicated prescan has been developed to measure the phase accumulation due to eddy currents induced by the slice-selective gradient. The prescan measures two one-dimensional excitation k-space profiles, which can be acquired with a readout gradient in the slice-selection direction by changing the polarity of the slice-selective gradient. The time shifts due to the phase accumulation in the excitation k-space were calculated. The time shift compensated for the start time of the slice-selective gradient. The total prescan time was 6-15 s. The slice profile and the UTE image with the half RF pulse excitation were acquired to evaluate the slice selectivity and the image quality.

RESULTS:

Improved slice selectivity was obtained. The simple method proposed in this paper can eliminate eddy current effect. Good UTE images were obtained.

CONCLUSIONS:

The slice profile of the half RF pulse excitation and the image quality of UTE images have been improved by using a dedicated prescan. This method has a possibility that can improve the image quality of a clinical UTE imaging.

PMID:
23464336
DOI:
10.1118/1.4792672
[Indexed for MEDLINE]
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