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Sun K, Zhong Z, Xu Z, Dan G, Karaman MM, Zhou XJ. In-plane simultaneous multisegment imaging using a 2D RF pulse. Magn Reson Med 2022; 87:263-271. [PMID: 34350601 PMCID: PMC8616791 DOI: 10.1002/mrm.28956] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2021] [Revised: 07/15/2021] [Accepted: 07/16/2021] [Indexed: 01/03/2023]
Abstract
PURPOSE To develop an in-plane simultaneous multisegment (IP-SMS) imaging technique using a 2D-RF pulse and to demonstrate its ability to achieve high spatial resolution in EPI while reducing image distortion. METHODS The proposed IP-SMS technique takes advantage of periodic replicates of the excitation profile of a 2D-RF pulse to simultaneously excite multiple segments within a slice. These segments were acquired over a reduced FOV and separated using a joint GRAPPA reconstruction by leveraging virtual coils that combined the physical coil sensitivity and 2D-RF pulse spatial response. Two excitations were used with complementary spatial response profiles to adequately cover a full FOV, producing a full-FOV image that had the benefits of reduced FOV with high spatial resolution and reduced distortion. The IP-SMS technique was implemented in a diffusion-weighted single-shot EPI sequence. Experimental demonstrations were performed on a phantom and healthy human brain. RESULTS In the phantom experiment, IP-SMS enabled a four-fold acceleration using an eight-channel coil without causing residual aliasing artifacts. In the human brain experiment, diffusion-weighted images with high in-plane resolution (1 × 1 mm2 ) and substantially reduced image distortion were obtained in all imaging planes in comparison with a commercial diffusion-weighted EPI sequence. The capability of IP-SMS for contiguous whole-brain coverage was also demonstrated. CONCLUSION The proposed IP-SMS technique can realize the benefits of reduced-FOV imaging while achieving a full-FOV coverage with good image quality and time efficiency.
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Affiliation(s)
- Kaibao Sun
- Center for Magnetic Resonance Research, University of Illinois at Chicago, Chicago, IL, United States
| | - Zheng Zhong
- Center for Magnetic Resonance Research, University of Illinois at Chicago, Chicago, IL, United States,Department of Bioengineering, University of Illinois at Chicago, Chicago, IL, United States
| | - Zhongbiao Xu
- Department of Radiation Oncology, Guangdong Provincial People’s Hospital, Guangzhou, China
| | - Guangyu Dan
- Center for Magnetic Resonance Research, University of Illinois at Chicago, Chicago, IL, United States,Department of Bioengineering, University of Illinois at Chicago, Chicago, IL, United States
| | - M. Muge Karaman
- Center for Magnetic Resonance Research, University of Illinois at Chicago, Chicago, IL, United States,Department of Bioengineering, University of Illinois at Chicago, Chicago, IL, United States
| | - Xiaohong Joe Zhou
- Center for Magnetic Resonance Research, University of Illinois at Chicago, Chicago, IL, United States,Department of Bioengineering, University of Illinois at Chicago, Chicago, IL, United States,Departments of Radiology and Neurosurgery, University of Illinois College of Medicine at Chicago, Chicago, IL, United States,Address correspondence to: Xiaohong Joe Zhou, PhD; ; Phone: 312-413-3979; Fax: 312-355-1637, Center for Magnetic Resonance Research, University of Illinois at Chicago, 2242 West Harrison Street, Suite 103, M/C 831 Chicago, IL 60612
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