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Instrument visualization using conventional and compressed sensing SEMAC for interventional MRI at 3T.

Lena Sonnow1,2,3, Wesley D Gilson4, Esther Raithel5

  • 1Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.

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|September 24, 2017
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Summary

Compressed sensing (CS) slice-encoding metal artifact correction (SEMAC) is a feasible technique for 3T interventional MRI, offering improved instrument visualization and faster acquisition compared to conventional methods.

Keywords:
3TSEMACartifactcompressed sensinginterventional MRIneedle

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Area of Science:

  • Medical Imaging
  • Magnetic Resonance Imaging (MRI)
  • Interventional Radiology

Background:

  • Interventional MRI at 3T offers enhanced resolution but suffers from larger metallic artifact sizes, potentially obscuring critical structures.
  • Metallic instruments used in interventional procedures can cause significant artifacts in 3T MRI, hindering accurate visualization.

Purpose of the Study:

  • To evaluate the feasibility of compressed sensing (CS) slice-encoding metal artifact correction (SEMAC) for 3T interventional MRI.
  • To compare the accuracy of instrument visualization using CS-SEMAC against traditional turbo spin echo (TSE) and gradient echo (GRE) techniques.
  • To assess the potential for faster data acquisition with CS-SEMAC compared to conventional SEMAC.

Main Methods:

  • Prospective study involving phantom experiments with MR-conditional needles and in vivo assessment in 20 human subjects undergoing interventional procedures.
  • Evaluation of TSE, GRE, SEMAC, and CS-SEMAC pulse sequences at 3T, measuring artifact dimensions, signal-to-noise ratio (SNR), and contrast-to-noise ratio (CNR).
  • In vivo assessment focused on artifact size, image sharpness, noise, motion, contrast, and visibility of targets, instruments, and surrounding structures.

Main Results:

  • CS-SEMAC and SEMAC demonstrated the smallest artifact widths (3.2-3.3 mm), significantly smaller than GRE (8.5-8.6 mm) (P < 0.001).
  • CS-SEMAC showed improved instrument visibility, reduced noise, and less motion compared to TSE and GRE (P < 0.001).
  • While high-bandwidth TSE offered better sharpness and target visibility, CS-SEMAC provided comparable image contrast and structural visibility.

Conclusions:

  • CS-SEMAC is a feasible and effective technique for interventional MRI at 3T, providing more accurate instrument visualization than TSE and GRE.
  • CS-SEMAC allows for a 55% faster data acquisition time compared to conventional SEMAC, enhancing procedural efficiency.
  • This technique significantly reduces metal artifacts, improving the safety and efficacy of interventional procedures guided by 3T MRI.