Estimating Accurate Target Coordinates with Magnetic Resonance Images by Using Multiple Phase-Encoding Directions during Acquisition

Minsoo Kim, Na Young Jung, Chang Kyu Park, Won Seok Chang, Hyun Ho Jung, Jin Woo Chang

Research output: Contribution to journalArticlepeer-review


Background: Stereotactic procedures are image guided, often using magnetic resonance (MR) images limited by image distortion, which may influence targets for stereotactic procedures. Objectives: The aim of this work was to assess methods of identifying target coordinates for stereotactic procedures with MR in multiple phase-encoding directions. Methods: In 30 patients undergoing deep brain stimulation, we acquired 5 image sets: stereotactic brain computed tomography (CT), T2-weighted images (T2WI), and T1WI in both right-to-left (RL) and anterior-to-posterior (AP) phase-encoding directions. Using CT coordinates as a reference, we analyzed anterior commissure and posterior commissure coordinates to identify any distortion relating to phase-encoding direction. Results: Compared with CT coordinates, RL-directed images had more positive x-axis values (0.51 mm in T1WI, 0.58 mm in T2WI). AP-directed images had more negative y-axis values (0.44 mm in T1WI, 0.59 mm in T2WI). We adopted 2 methods to predict CT coordinates with MR image sets: parallel translation and selective choice of axes according to phase-encoding direction. Both were equally effective at predicting CT coordinates using only MR; however, the latter may be easier to use in clinical settings. Conclusion: Acquiring MR in multiple phase-encoding directions and selecting axes according to the phase-encoding direction allows identification of more accurate coordinates for stereotactic procedures.

Original languageEnglish
Pages (from-to)113-119
Number of pages7
JournalStereotactic and functional neurosurgery
Issue number2
Publication statusPublished - 2018 Jun 1

Bibliographical note

Funding Information:
The authors thank Ms. Eun Jung Kweon and Ms. Sang Keum Park (our coordinator) for their support with the technical aspects of this study. This work is supported by the Technology Innovation Program (10062800) funded by the Ministry of Knowledge Economy (MKE, Korea).

Publisher Copyright:
© 2018 S. Karger AG, Basel. Copyright: All rights reserved.

All Science Journal Classification (ASJC) codes

  • Surgery
  • Clinical Neurology


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