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Optimizing fMRI Acquisition

Tom Zeffiro

 

The ultimate success of any fMRI experiment depends fundamentally on the quality of the collected image data. Of the many possible acquisition parameter selections, there are a few that can strongly influence a functional neuroimaging experiment's sensitivity in detecting patterns of task-related activity. They include MRI system static field strength, head coil design, echo time, repetition time, voxel dimensions, slice acquiisition order, slice angle, shim adequacy and session length.

 

 


 

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References

 

GENERAL

 

J Magn Reson Imaging. 2006 Jun;23(6):794-807.
Principles of magnetic resonance assessment of brain function.
Norris DG.

 

Exp Brain Res. 1998 Nov;123(1-2):5-12.
Functional magnetic resonance imaging of the human brain: data acquisition and
analysis.
Turner R, Howseman A, Rees GE, Josephs O, Friston K.

 

FIELD STRENGTH

 

Magn Reson Med. 1993 Feb;29(2):277-9. Functional mapping of the human visual cortex at 4 and 1.5 tesla using deoxygenation contrast EPI. Turner R, Jezzard P, Wen H, Kwong KK, Le Bihan D, Zeffiro T, Balaban RS.

 

Acad Radiol. 2005 Feb;12(2):142-7.
Magnetic field strength increase yields significantly greater contrast-to-noise
ratio increase: Measured using BOLD contrast in the primary visual area.
Okada T, Yamada H, Ito H, Yonekura Y, Sadato N.

 

Neuroimage. 2005 May 15;26(1):243-50. Comparison of physiological noise at 1.5 T, 3 T and 7 T and optimization of fMRI acquisition parameters. Triantafyllou C, Hoge RD, Krueger G, Wiggins CJ, Potthast A, Wiggins GC, Wald LL.

 

Neuroimage. 2003 Apr;18(4):813-26.
Comparison of fMRI activation at 3 and 1.5 T during perceptual, cognitive, and
affective processing.
Krasnow B, Tamm L, Greicius MD, Yang TT, Glover GH, Reiss AL, Menon V.

 

MAGMA. 2008 Mar;21(1-2):113-20. Epub 2007 Dec 18.
High resolution SE-fMRI in humans at 3 and 7 T using a motor task.
Schäfer A, van der Zwaag W, Francis ST, Head KE, Gowland PA, Bowtell RW.

 

HEAD COILS

 

Phys Med Biol. 2007 Apr 7;52(7):R15-55. Epub 2007 Mar 9.
Parallel magnetic resonance imaging.
Larkman DJ, Nunes RG.

 

Magn Reson Med. 2006 Jul;56(1):216-23. 32-channel 3 Tesla receive-only phased-array head coil with soccer-ball element geometry. Wiggins GC, Triantafyllou C, Potthast A, Reykowski A, Nittka M, Wald LL.

 

Eur Radiol. 2005 Aug;15(8):1555-62. Epub 2005 Apr 23.
Comparison of volume, four- and eight-channel head coils using standard and parallel imaging.
Gizewski ER, Maderwald S, Wanke I, Goehde S, Forsting M, Ladd ME.

 

ECHO TIME

 

Neuroimage. 2002 Jan;15(1):136-42.
Echo time dependence of BOLD contrast and susceptibility artifacts.
Gorno-Tempini ML, Hutton C, Josephs O, Deichmann R, Price C, Turner R.

 

J Magn Reson Imaging. 2004 Jan;19(1):19-26.
EPI-BOLD fMRI of human motor cortex at 1.5 T and 3.0 T: sensitivity dependence on
echo time and acquisition bandwidth.
Fera F, Yongbi MN, van Gelderen P, Frank JA, Mattay VS, Duyn JH.

 

REPETITION TIME

 

Magn Reson Med. 2001 Oct;46(4):748-55.
Repetition time in echo planar functional MRI.
Constable RT, Spencer DD.

 

VOXEL DIMENSIONS

 

MAGMA. 2008 Jul;21(4):279-90. Epub 2008 Jul 26.
The impact of EPI voxel size on SNR and BOLD sensitivity in the anterior
medio-temporal lobe: a comparative group study of deactivation of the Default
Mode.
Robinson SD, Pripfl J, Bauer H, Moser E.

 

SLICE ACQUISITION ORDER

Neuroimage. 1999 Apr;9(4):363-76.
The effect of slice order and thickness on fMRI activation data using multislice echo-planar imaging. Howseman AM, Grootoonk S, Porter DA, Ramdeen J, Holmes AP, Turner R.

 

SLICE ANGLE

 

FIELD MAP

 

Hum Brain Mapp. 1999;8(2-3):80-5.
Sources of distortion in functional MRI data.
Jezzard P, Clare S.

 

Neuroimage. 2002 May;16(1):217-40.
Image distortion correction in fMRI: A quantitative evaluation.
Hutton C, Bork A, Josephs O, Deichmann R, Ashburner J, Turner R.

 

Neuroimage. 2003 Jan;18(1):127-42.
An evaluation of the use of magnetic field maps to undistort echo-planar images.
Cusack R, Brett M, Osswald K.

 

SESSION LENGTH

 

Neuroimage. 2008 Jan 1;39(1):261-8. Epub 2007 Aug 19.
Power calculation for group fMRI studies accounting for arbitrary design and
temporal autocorrelation.
Mumford JA, Nichols TE.

 

Neuroimage. 2007 Sep 1;37(3):721-30. Epub 2007 Jun 18.
Power and sample size calculation for neuroimaging studies by non-central random
field theory.
Hayasaka S, Peiffer AM, Hugenschmidt CE, Laurienti PJ.
 

 

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