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Related Experiment Videos

TRIM: TR independent multislice imaging.

Hans-Peter Fautz1, Dominik Paul, Klaus Scheffler

  • 1Department of Radiological Research, Medical Physics, University Hospital Freiburg, Freiburg, Germany. hanspeter.fautz@uniklinik-freiburg.de

Magnetic Resonance in Medicine
|June 2, 2004
PubMed
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TR-independent multislice (TRIM) acquisition decouples image contrast from spatial parameters. This novel method enables flexible slice selection and acquisition, overcoming limitations in multislice MRI.

Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Medical Imaging Technology

Background:

  • Multislice MRI acquisition is often constrained by spatial positioning parameters like slice number and separation.
  • Image contrast in multislice imaging can be dependent on repetition time (TR) and spatial parameters, limiting flexibility.

Purpose of the Study:

  • To introduce a novel multislice acquisition technique, TR-independent multislice (TRIM), to overcome dependence on spatial positioning parameters.
  • To develop ramped TRIM (rTRIM) for independent control of excited section distance and reconstructed slice distance.
  • To enable acquisition of overlapping slices without crosstalk.

Main Methods:

  • TRIM acquisition allows slice number independence from repetition time (TR).
  • Ramped TRIM (rTRIM) decouples excited section distance from reconstructed slice distance.

Related Experiment Videos

  • A special reordering scheme using a design matrix assigns different phase-encoding steps to different slices within a TR cycle.
  • Point spread function analysis, simulations, and phantom measurements were used to evaluate imaging properties.

    • Main Results:

    • TRIM and rTRIM enable flexible control over slice acquisition parameters.
    • Spatially overlapping excitation profiles prevent crosstalk between adjacent slices, even in overlapping acquisitions.
    • Artifact sources were identified, and prevention methods were developed.
    • Optimized implementations were demonstrated on volunteers using T(1)-weighted sequences (SE, TSE, spoiled GRE).

    Conclusions:

    • TRIM represents a novel concept for advanced multislice MRI acquisition.
    • The technique offers enhanced flexibility in slice selection and acquisition, independent of TR.
    • rTRIM effectively manages slice separation and excitation profiles, preventing crosstalk.
    • The demonstrated implementations show the clinical potential of TRIM in routine diagnostic imaging.