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Acceleration of Brain TOF-MRA with Compressed Sensitivity Encoding: A Multicenter Clinical Study.

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Compressed sensitivity encoding (CS) accelerates time-of-flight MR angiography (TOF-MRA) for brain artery assessment. CS4 offers a balance of image quality and speed for routine use, while higher factors like CS10 are suitable for rapid large artery visualization.

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Area of Science:

  • Medical Imaging
  • Radiology
  • Neuroimaging

Background:

  • Three-dimensional time-of-flight MR angiography (3D TOF-MRA) is crucial for brain artery assessment.
  • Long scan times have limited the clinical utility of 3D TOF-MRA.
  • Fast imaging techniques, including compressed sensitivity encoding (CS), offer potential improvements in speed-quality balance.

Purpose of the Study:

  • To evaluate the effectiveness of compressed sensitivity encoding (CS) for accelerating 3D TOF-MRA.
  • To determine optimal CS acceleration factors for routine clinical brain TOF-MRA.

Main Methods:

  • One hundred subjects underwent 8 brain TOF-MRA sequences: 5 with CS (factors 2-10), 2 with standard SENSE (SF2, SF4), and 1 reference (RS).
  • Quantitative (signal intensity, structural similarity, contrast ratio) and qualitative (artery visualization, artifacts, diagnostic confidence) assessments were performed.
  • Comparisons were made among all 8 sequences across large, medium, and small arteries.

Main Results:

  • Image quality metrics (signal intensity, structural similarity) decreased with increasing CS acceleration factors.
  • No significant difference in contrast ratios was found between SF2, CS2, and CS4.
  • Acceptable visualization of all arteries was achieved with CS2 and CS4; CS6 showed limitations in small artery visualization; CS8 and CS10 were acceptable for large arteries.

Conclusions:

  • Compressed sensitivity encoding factor 4 (CS4) is recommended for routine brain TOF-MRA, balancing image quality and acquisition time.
  • CS6 is suitable when small artery visualization is not critical.
  • CS10 enables fast visualization of large arteries.