Reconstruction of magnetic resonance images from EPI data

Roderick W. McColl, Geoffrey D Clarke, Ronald M M D Peshock

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

Abstract

We present a method for reconstructing magnetic resonance (MR) images from data acquired using echo-planar imaging (EPI) techniques. All data were acquired from a commercial scanner, the 1.5 Tesla Picker Vista HPQ MR imaging system, equipped with a special, high-performance, gradient system. Blipped echo planar imaging (BEPI) was performed, with and without digitizer pausing during data acquisition. Both sinusoidal and trapezoidal readout gradients were programmed and tested. Samples obtained from the gradient amplifier current monitors were used to calculate the approximate position of every sample obtained in the spatial-frequency (k-space) plane. A convolution function with compact support int he k-space and good rolloff in the image domain was used to resample the data onto a lattice permitting the use of fast transformation methods to the image domain. Strong ghosting was observed in the resulting images due probably to static magnetic field variation, gradient asymmetry and echo asymmetry between data lines. A piecewise-linear function was used to model the introduced ghost and hence to remove pixels in the reconstructed image which were determined to be spurious. Initial results are promising.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
EditorsRodney Shaw
Place of PublicationBellingham, WA, United States
PublisherPubl by Society of Photo-Optical Instrumentation Engineers
Pages158-168
Number of pages11
Volume1896
ISBN (Print)0819411302
StatePublished - 1993
Externally publishedYes
EventMedical Imaging 1993: Physics of Medical Imaging - Newport Beach, CA, USA
Duration: Feb 14 1992Feb 19 1992

Other

OtherMedical Imaging 1993: Physics of Medical Imaging
CityNewport Beach, CA, USA
Period2/14/922/19/92

Fingerprint

Magnetic resonance
magnetic resonance
echoes
Imaging techniques
gradients
Convolution
Imaging systems
Data acquisition
Pixels
Magnetic fields
asymmetry
current amplifiers
analog to digital converters
ghosts
convolution integrals
imaging techniques
scanners
data acquisition
readout
monitors

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

McColl, R. W., Clarke, G. D., & Peshock, R. M. M. D. (1993). Reconstruction of magnetic resonance images from EPI data. In R. Shaw (Ed.), Proceedings of SPIE - The International Society for Optical Engineering (Vol. 1896, pp. 158-168). Bellingham, WA, United States: Publ by Society of Photo-Optical Instrumentation Engineers.

Reconstruction of magnetic resonance images from EPI data. / McColl, Roderick W.; Clarke, Geoffrey D; Peshock, Ronald M M D.

Proceedings of SPIE - The International Society for Optical Engineering. ed. / Rodney Shaw. Vol. 1896 Bellingham, WA, United States : Publ by Society of Photo-Optical Instrumentation Engineers, 1993. p. 158-168.

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

McColl, RW, Clarke, GD & Peshock, RMMD 1993, Reconstruction of magnetic resonance images from EPI data. in R Shaw (ed.), Proceedings of SPIE - The International Society for Optical Engineering. vol. 1896, Publ by Society of Photo-Optical Instrumentation Engineers, Bellingham, WA, United States, pp. 158-168, Medical Imaging 1993: Physics of Medical Imaging, Newport Beach, CA, USA, 2/14/92.
McColl RW, Clarke GD, Peshock RMMD. Reconstruction of magnetic resonance images from EPI data. In Shaw R, editor, Proceedings of SPIE - The International Society for Optical Engineering. Vol. 1896. Bellingham, WA, United States: Publ by Society of Photo-Optical Instrumentation Engineers. 1993. p. 158-168
McColl, Roderick W. ; Clarke, Geoffrey D ; Peshock, Ronald M M D. / Reconstruction of magnetic resonance images from EPI data. Proceedings of SPIE - The International Society for Optical Engineering. editor / Rodney Shaw. Vol. 1896 Bellingham, WA, United States : Publ by Society of Photo-Optical Instrumentation Engineers, 1993. pp. 158-168
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