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Single shot spiral TSE with annulated segmentation. | LitMetric

Single shot spiral TSE with annulated segmentation.

Magn Reson Med

University Medical Center FREIBURG, Dept.of Radiology, Medical Physics, Freiburg, Germany.

Published: August 2022

AI Article Synopsis

  • The study focuses on developing a new magnetic resonance imaging technique, the single shot spiral turbo spin echo (TSE) sequence, to capture high-quality images of the central nervous system in under 200 milliseconds with 1mm resolution.
  • The method uses different acquisition modes (fixed and tangential) to optimize image quality and acquisition speed while minimizing artifacts from magnetic susceptibility.
  • The results show that this technique can produce high-resolution brain images with reduced artifacts compared to traditional 1.5T imaging, allowing for rapid and efficient imaging without waiting times between slices.

Article Abstract

Purpose: To develop, optimize, and implement a single shot spiral turbo spin echo (TSE) sequence at 3T and to demonstrate its feasibility to acquire artifact free images of the central nervous system with 1 mm spatial resolution in <200 ms.

Theory And Methods: Spiral TSE sequences with annulated spiral segmentation have been implemented with different acquisition modes. In fixed mode, the duration of each spiral segment is fixed to fill the available acquisition time t . In tangential mode, the beginning of each spiral segment is reached via a straight tangential trajectory. Tangential mode allows faster transition and thus longer t for a given echo spacing (ESP), but less data points can be acquired per acquisition interval. Alternating between spiral-in and spiral-out readout in alternating echoes leads to a somewhat different point spread function for off-resonant spins.

Results: Images of the brain with 1 mm spatial resolution acquired with a variable density spiral with ∼40% undersampling can be acquired in a single shot. All acquisition modes produce comparable image quality. Only mild artifacts in regions of strong susceptibility effects can be observed for ESP of 10 ms and below. The use of variable flip angle schemes allows seamless acquisition of consecutive slices and/or dynamic scans without waiting time between consecutive acquisitions. Comparison with images acquired at 1.5T shows reduced susceptibility artifacts within the brain and facial structures.

Conclusion: Single shot spiral TSE has been demonstrated to enable highly efficient acquisition of high-resolution images of the brain in <200 ms per slice.

Download full-text PDF

Source
http://dx.doi.org/10.1002/mrm.29224DOI Listing

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