Concomitant gradient field effects in balanced steady-state free precession.

Concomitant gradient field effects in balanced steady-state free precession. Research Abstract Details 

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Concomitant gradient field effects in balanced steady-state free precession. Abstract Text:

Christopher T Sica,Craig H Meyer,

Linear magnetic field gradients spatially encode the image information in MRI. Concomitant gradients are undesired magnetic fields that accompany the desired gradients and occur as an unavoidable consequence of Maxwell's equations. These concomitant gradients result in undesired phase accumulation during MRI scans. Balanced steady-state free precession (bSSFP) is a rapid imaging method that is known to suffer from signal dropout from off-resonance phase accrual. In this work it is shown that concomitant gradient phase accrual can induce signal dropout in bSSFP. The spatial variation of the concomitant phase is explored and shown to be a function of gradient strength, slice orientation, phase-encoding (PE) direction, distance from isocenter, and main field strength. The effect on the imaging signal level was simulated and then verified in phantom and in vivo experiments. The nearest signal-loss artifacts occurred in scans that were offset from isocenter along the z direction with a transverse readout. Methods for eliminating these artifacts, such as applying compensatory frequency or shim offsets, are demonstrated. Concomitant gradient artifacts can occur at 1.5T, particularly in high-resolution scans or with additional main field inhomogeneity. These artifacts will occur closer to isocenter at field strengths below 1.5T because concomitant gradients are inversely proportional to the main field strength.

Concomitant gradient field effects in balanced steady-state free precession. Publishing Authors By Initials

CT Sica,CH Meyer,

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Concomitant gradient field effects in balanced steady-state free precession. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Magnetic resonance in medicine : official journal

VOLUME: 57

Page Numbers: 721-30

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ISSN: 0740-3194

DAY: 3

MONTH: Apr

YEAR: 2007

Concomitant gradient field effects in balanced steady-state free precession. Information

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LANGUAGE: eng

NlmUniqueID: 8505245

Concomitant gradient field effects in balanced steady-state free precession. Keywords Mesh Terms:

KEYWORDS: Phantoms, Imaging

MESH TERMS: methods

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Grant and Affiliation Information for Concomitant gradient field effects in balanced steady-state free precession.

AFFILIATION: Engineering Physics Program, University of Virginia, Charlottesville, Virginia 22908, USA.

Country: United States

AGENCY: United States NHLBI

GRANT: R01 HL079110

ACRONYM: HL

MEDLINETA: Magn Reson Med

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