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Passive needle guide tracking with radial acquisition and phase-only cross-correlation.

Andreas Reichert1, Simon Reiss1, Axel Joachim Krafft1

  • 1Department of Radiology, Medical Physics, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany.

Magnetic Resonance in Medicine
|August 9, 2020
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Summary

Radial undersampling accelerates passive tracking sequences using phase-only cross-correlation (POCC) for MR-guided interventions. This method significantly reduces acquisition time without impacting targeting accuracy, enhancing real-time instrument tracking.

Keywords:
MR-guided interventional proceduresMR-guided needle interventionMR-guided prostate biopsyinterventional magnetic resonance imaginginterventional radiology

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Area of Science:

  • Medical Imaging
  • Interventional Radiology
  • Magnetic Resonance Imaging

Background:

  • Phase-only cross-correlation (POCC) enables real-time passive tracking of interventional instruments using MR imaging.
  • Conventional Cartesian imaging for POCC sequences is time-consuming, limiting real-time applications.
  • Faster imaging is crucial for improving procedural efficiency and patient outcomes in MR-guided interventions.

Purpose of the Study:

  • To accelerate passive tracking sequences based on phase-only cross-correlation (POCC) by employing radial undersampling.
  • To evaluate the impact of radial undersampling on the temporal resolution and targeting accuracy of POCC sequences.
  • To demonstrate the feasibility of this accelerated technique for MR-guided needle interventions.

Main Methods:

  • Implemented a modified POCC algorithm incorporating point-spread-function with highly undersampled radial acquisition.
  • Conducted phantom experiments with fiducial targets using 4 and 16 radial projections for needle guide tracking.
  • Performed in vivo experiments targeting basivertebral veins in the lumbar spine using 4 radial projections for needle guide tracking.

Main Results:

  • Radially undersampled POCC sequences achieved lateral targeting accuracy of 1.1 ± 0.4 mm (16 projections) and 1.0 ± 0.5 mm (4 projections) in phantom studies.
  • No statistically significant difference in targeting accuracy was observed between different numbers of radial projections.
  • In vivo applications demonstrated a mean targeting duration of 62 ± 13 seconds for needle guide tracking.

Conclusions:

  • Radial undersampling significantly reduces acquisition time for POCC-based passive tracking in MR-guided needle interventions.
  • The proposed method accelerates tracking without compromising targeting accuracy.
  • This technique offers a promising approach for real-time instrument tracking in interventional procedures.