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Reduced Field-of-view Single-shot Fast Spin Echo Imaging using Two-dimensional Spatially Selective Radiofrequency Pulses

Yuan J.¹, Zhao T-C.², Tang Y.³, Panych L.P.³


Institution:	¹Department of Diagnostic Radiology and Organ Imaging, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China. jyuan@cuhk.edu.hk ²Department of Electronic Engineering, National Taiwan University, Taipei, Taiwan ³Department of Radiology, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts, USA
Publisher:	John Wiley & Sons, Inc.
Publication Date:	Jul-2010
Journal:	J Magn Reson Imaging
Volume Number:	32
Issue Number:	1
Pages:	242-8
Citation:	J Magn Reson Imaging. 2010 Jul;32(1):242-8.
PubMed ID:	20578031
PMCID:	PMC2925423
Keywords:	reduced field-of-view imaging, 2DRF pulse, echo train length, blurring, echo spacing, single-shot fast spin echo
Appears in Collections:	NCIGT, MIPG
Sponsors:	U41 RR019703 (RR) funded by NCRR NIH HHS
Generated Citation:	Yuan J., Zhao T-C., Tang Y., Panych L.P. Reduced Field-of-view Single-shot Fast Spin Echo Imaging using Two-dimensional Spatially Selective Radiofrequency Pulses. J Magn Reson Imaging. 2010 Jul;32(1):242-8. PMID: 20578031. PMCID: PMC2925423.
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To demonstrate reduced field-of-view (RFOV) single-shot fast spin echo (SS-FSE) imaging based on the use of two-dimensional spatially selective radiofrequency (2DRF) pulses. MATERIALS AND METHODS: The 2DRF pulses were incorporated into an SS-FSE sequence for RFOV imaging in both phantoms and the human brain on a 1.5 Tesla (T) whole-body MR system with the aim of demonstrating improvements in terms of shorter scan time, reduced blurring, and higher spatial resolution compared with full FOV imaging. RESULTS: For phantom studies, scan time gains of up to 4.2-fold were achieved as compared to the full FOV imaging. For human studies, the spatial resolution was increased by a factor of 2.5 (from 1.7 mm/pixel to 0.69 mm/pixel) for RFOV imaging within a scan time (0.7 s) similar to full FOV imaging. A 2.2-fold shorter scan time along with a significant reduction of blurring was demonstrated in RFOV images compared with full FOV images for a target spatial resolution of 0.69 mm/pixel. CONCLUSION: RFOV SS-FSE imaging using a 2DRF pulse shows advantages in scan time, blurring, and specific absorption rate reduction along with true spatial resolution increase compared with full FOV imaging. This approach is promising to benefit fast imaging applications such as image guided therapy.

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