Abstract

Echo-planar imaging (EPI) is sensitive to magnetic field inhomogeneities which lead to signal loss and geometric distortions of the image. The magnetic field inhomogeneities induced due to susceptibility differences, as encountered in the human body, increase with the magnetic field strength. Thus, it is a challenge to implement high resolution EPI techniques on high magnetic field systems. Furthermore, in EPI images, each k-space line has different dephasing in the phase-encoding direction if flow is present, causing artifacts in the phase-encoding direction. In the last grant period, we developed a new phase-encoded referencing scheme for EPI and demonstrated that the new referencing scheme virtually eliminates N/2 ghosts despite the strong field inhomogeneity present at high fields. The image distortion that may arise from Bo inhomogeneity in EPI as well as other ultrafast imaging sequences was also addressed in the last year with a new technique for correction such image degradation.

  Funding Agency

Agency
National Institute of Health (NIH)
Institute
National Center for Research Resources (NCRR)
Type
Biotechnology Resource Grants (P41)
Project #
5P41RR008079-07
Application #
6122799
Study Section
Project Start
1999-06-01
Project End
2000-05-31
Budget Start
1998-10-01
Budget End
1999-09-30
Support Year
7
Fiscal Year
1999
Total Cost
Indirect Cost

  Institution

Name
University of Minnesota Twin Cities
Department
Type
DUNS #
168559177
City
Minneapolis
State
MN
Country
United States
Zip Code
55455

  Publications

Herzberg, Max P; Hodel, Amanda S; Cowell, Raquel A et al. (2018) Risk taking, decision-making, and brain volume in youth adopted internationally from institutional care. Neuropsychologia 119:262-270
U?urbil, Kamil (2018) Imaging at ultrahigh magnetic fields: History, challenges, and solutions. Neuroimage 168:7-32
Foell, Jens; Palumbo, Isabella M; Yancey, James R et al. (2018) Biobehavioral threat sensitivity and amygdala volume: A twin neuroimaging study. Neuroimage 186:14-21
Magnitsky, Sergey; Pickup, Stephan; Garwood, Michael et al. (2018) Imaging of a high concentration of iron labeled cells with positive contrast in a rat knee. Magn Reson Med :
Lee, Byeong-Yeul; Zhu, Xiao-Hong; Woo, Myung Kyun et al. (2018) Interleaved 31 P MRS imaging of human frontal and occipital lobes using dual RF coils in combination with single-channel transmitter-receiver and dynamic B0 shimming. NMR Biomed 31:
Wilson, Sylia; Malone, Stephen M; Hunt, Ruskin H et al. (2018) Problematic alcohol use and hippocampal volume in a female sample: disentangling cause from consequence using a co-twin control study design. Psychol Med 48:1673-1684
Bolan, Patrick J; Kim, Eunhee; Herman, Benjamin A et al. (2017) MR spectroscopy of breast cancer for assessing early treatment response: Results from the ACRIN 6657 MRS trial. J Magn Reson Imaging 46:290-302
Nelson, Brent G; Bassett, Danielle S; Camchong, Jazmin et al. (2017) Comparison of large-scale human brain functional and anatomical networks in schizophrenia. Neuroimage Clin 15:439-448
Wang, Yi; Shao, Xingfeng; Martin, Thomas et al. (2016) Phase-cycled simultaneous multislice balanced SSFP imaging with CAIPIRINHA for efficient banding reduction. Magn Reson Med 76:1764-1774
Thatcher, R W; Palmero-Soler, E; North, D M et al. (2016) Intelligence and eeg measures of information flow: efficiency and homeostatic neuroplasticity. Sci Rep 6:38890

Showing the most recent 10 out of 493 publications