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Related Experiment Videos

Two-dimensional parallel acquisition technique in 3D MR colonography.

G Steidle1, J Schäfer, H P Schlemmer

  • 1Sektion für Experimentelle Radiologie, Eberhard-Karls-Universität Tübingen. guenter.steidle@med.uni-tuebingen.de

Rofo : Fortschritte Auf Dem Gebiete Der Rontgenstrahlen Und Der Nuklearmedizin
|September 4, 2004
PubMed
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Two-dimensional parallel acquisition techniques (2D PAT) in MR colonography offer reduced scan times with only moderate loss in contrast-to-noise ratio (CNR). This enables high-quality imaging, minimizing motion artifacts for better diagnostic accuracy.

Area of Science:

  • Magnetic Resonance Imaging
  • Medical Imaging Technology
  • Gastrointestinal Imaging

Background:

  • Bright-lumen 3D MR colonography is a valuable tool for colorectal cancer screening.
  • Parallel acquisition techniques (PAT) accelerate MR imaging by using multiple receiver coils.
  • Optimizing PAT is crucial for balancing scan time, image quality, and diagnostic performance.

Purpose of the Study:

  • To evaluate the impact of 1D and 2D PAT on contrast-to-noise ratio (CNR) and image quality in bright-lumen 3D MR colonography.
  • To compare the effectiveness of different acceleration factors (PAT factors) in reducing scan time and artifacts.

Main Methods:

  • In-vitro phantom studies using 3D GRE and VIBE sequences on a 1.5 T MR scanner.
  • Evaluation of relative CNR and image quality at varying PAT factors (2, 3, 4, 6).

Related Experiment Videos

  • In-vivo bright-lumen 3D MR colonography in a volunteer using different PAT factors.

    • Main Results:

    • In-vitro CNR decreased with increasing PAT factors for both sequences, with VIBE showing slightly lower values.
    • 2D PAT introduced mild aliasing artifacts, particularly with the VIBE sequence, but these did not significantly degrade image quality.
    • In-vivo imaging demonstrated adequate image quality with reduced motion artifacts at high PAT factors (up to 6), achieving scan times as short as 10 seconds.

    Conclusions:

    • 2D PAT in 3D MR colonography results in a moderate loss of CNR, even at high acceleration factors (up to 6).
    • Shorter acquisition times are achievable with 2D PAT without compromising image resolution.
    • 2D PAT is a viable technique for accelerating 3D MR colonography, improving patient comfort and reducing motion-related artifacts.