Compensation for the MR geometric image distortion caused by the implantable drug infusion pump

H. Liu, J. Kucharczyk, Chip Truwit

Research output: Contribution to journalConference articlepeer-review


Implantable devices often cause serious MR image artifacts in the vicinity of their implanted locations as the result of susceptibility-induced image distortion, and the resulting artifacts may render the MR images useless for diagnosis. To reduce the MR artifacts in the stage of image acquisition, we have implemented a scheme by which the field inhomogeneity is compensated in a spin echo imaging sequence by introducing a readout-like gradient pulse along the slice-select gradient direction temporally concurrent with the read-out gradient (TE=20msec). It can be shown that this slice direction compensation gradient pulse during the read-out period compensates the field inhomogeneity during the image data collection period. Though there was a shift in the direction of the read-out direction as a result of the compensation gradient for non-central slices, this shift can be predicted and it can be corrected either at the image acquisition stage by offsetting the frequency or as a post image processing. Our experimental studies showed that images obtained with a common implantable infusion pump exhibited a substantial reduction in terms of the image distortion compared with that of the standard imaging technique. In conclusion, the susceptibility-induced image artifacts can be significantly reduced using the compensation scheme.

Original languageEnglish (US)
Pages (from-to)924-926
Number of pages3
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 2001
EventMedical Imaging 2001: Physics of Medical Imaging - San Diego, CA, United States
Duration: Feb 18 2001Feb 20 2001


  • Field inhomogeneity
  • Geometric image distortion
  • Image artifacts
  • Infusion pump
  • MRI
  • Susceptibility


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