Retrospective correction of B 0-field-induced geometric distortions in multislice echo-planar images: A 3D solution

Roderick W. McColl, Edward A. Coburn

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A method has been developed to utilize a 3D B 0 fieldmap, with a multi-volume-of-interest segmentation map, to quantify and correct geometric distortions in echo-planar images. The purpose is to provide accurate co-registration of anatomical MRI to functional MRI time course sequences. A data structure capable of extracting and reporting the necessary information forms a central part of the solution. Images were obtained from a 1.5 Tesla scanner with an experimental y-gradient insert coil. Two 3D-gradient echo sequences supply the data needed to calculate the B 0 map across the volume. Segmentation of the volume into brain/background produces the data needed for the phase unwrapping and volume(s) of interest generation, from which the global B 0 variation map is obtained. Subsequent EPI acquisition yields the fMRI time-course information. Tests were carried out on a phantom and a human volunteer engaged in a motor task (finger-tapping). Strong distortions were measured, and subsequently corrected, particularly near the petrous bone/mastoid air cells and in the frontal and maxillary sinuses. Additionally, a strong eddy current resulting from the unshielded y-gradient was detected. The method facilitates geometric distortion correction through an imaging volume, containing multiple regions of interest within a slice, starting from a single starting point.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
PublisherSociety of Photo-Optical Instrumentation Engineers
Pages559-569
Number of pages11
Volume3977
StatePublished - 2000
EventMedical Imaging 2000: Physics of Medical Imaging - San Diego, CA, USA
Duration: Feb 13 2000Feb 15 2000

Other

OtherMedical Imaging 2000: Physics of Medical Imaging
CitySan Diego, CA, USA
Period2/13/002/15/00

Fingerprint

echoes
gradients
Eddy currents
mastoids
Magnetic resonance imaging
Data structures
Brain
Bone
sinuses
data structures
Imaging techniques
inserts
eddy currents
bones
scanners
brain
Air
acquisition
coils
air

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

McColl, R. W., & Coburn, E. A. (2000). Retrospective correction of B 0-field-induced geometric distortions in multislice echo-planar images: A 3D solution. In Proceedings of SPIE - The International Society for Optical Engineering (Vol. 3977, pp. 559-569). Society of Photo-Optical Instrumentation Engineers.

Retrospective correction of B 0-field-induced geometric distortions in multislice echo-planar images : A 3D solution. / McColl, Roderick W.; Coburn, Edward A.

Proceedings of SPIE - The International Society for Optical Engineering. Vol. 3977 Society of Photo-Optical Instrumentation Engineers, 2000. p. 559-569.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

McColl, RW & Coburn, EA 2000, Retrospective correction of B 0-field-induced geometric distortions in multislice echo-planar images: A 3D solution. in Proceedings of SPIE - The International Society for Optical Engineering. vol. 3977, Society of Photo-Optical Instrumentation Engineers, pp. 559-569, Medical Imaging 2000: Physics of Medical Imaging, San Diego, CA, USA, 2/13/00.
McColl RW, Coburn EA. Retrospective correction of B 0-field-induced geometric distortions in multislice echo-planar images: A 3D solution. In Proceedings of SPIE - The International Society for Optical Engineering. Vol. 3977. Society of Photo-Optical Instrumentation Engineers. 2000. p. 559-569
McColl, Roderick W. ; Coburn, Edward A. / Retrospective correction of B 0-field-induced geometric distortions in multislice echo-planar images : A 3D solution. Proceedings of SPIE - The International Society for Optical Engineering. Vol. 3977 Society of Photo-Optical Instrumentation Engineers, 2000. pp. 559-569
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