Self-calibrated multiple-echo acquisition with radial trajectories using the conjugate gradient method (SMART-CG).
Purpose: To remove phase inconsistencies between multiple echoes, an algorithm using a radial acquisition to provide inherent phase and magnitude information for self correction was developed. The information also allows simultaneous support for parallel imaging for multiple coil acquisitions.Materi...
| Published in: | Journal of Magnetic Resonance Imaging Vol. 33; no. 4; pp. 980 - 988 |
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| Main Authors: | , , , , , , , |
| Format: | Journal Article |
| Published: |
Wiley-Blackwell
Apr2011
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| Online Access: | View this record in EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=104859534&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 104859534 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 10531807 O63 jtl: Journal of Magnetic Resonance Imaging issn: 10531807 maglogo: Y pubinfo: dt: Apr2011 vid: 33 iid: 4 pid: 480 pub: Wiley-Blackwell place: Malden, Massachusetts artinfo: ui: 104859534 NLM21448967 2010997484 10.1002/jmri.22482 NLM21448967 PMC3075572 104859534 ppf: 980 ppct: 8 formats: tig: atl: Self-calibrated multiple-echo acquisition with radial trajectories using the conjugate gradient method (SMART-CG). aug: au: Jung Y Samsonov AA Bydder M Block WF Jung, Youngkyoo Samsonov, Alexey A Bydder, Mark Block, Walter F affil: Department of Radiology, Wake Forest University School of Medicine, Winston-Salem, North Carolina, USA sug: subj: Diagnostic Imaging Methods Image Processing, Computer Assisted Methods Algorithms Calibration Computers and Computerization Diffusion Equipment Design Mathematics Magnetic Resonance Imaging Methods Specialties, Medical Methods ab: Purpose: To remove phase inconsistencies between multiple echoes, an algorithm using a radial acquisition to provide inherent phase and magnitude information for self correction was developed. The information also allows simultaneous support for parallel imaging for multiple coil acquisitions.Materials and Methods: Without a separate field map acquisition, a phase estimate from each echo in multiple echo train was generated. When using a multiple channel coil, magnitude and phase estimates from each echo provide in vivo coil sensitivities. An algorithm based on the conjugate gradient method uses these estimates to simultaneously remove phase inconsistencies between echoes, and in the case of multiple coil acquisition, simultaneously provides parallel imaging benefits. The algorithm is demonstrated on single channel, multiple channel, and undersampled data.Results: Substantial image quality improvements were demonstrated. Signal dropouts were completely removed and undersampling artifacts were well suppressed.Conclusion: The suggested algorithm is able to remove phase cancellation and undersampling artifacts simultaneously and to improve image quality of multiecho radial imaging, the important technique for fast three-dimensional MRI data acquisition. pubtype: Academic Journal doctype: Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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