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Magnetic Resonance Imaging01:24

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Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
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Quantitative Magnetic Resonance Imaging of Skeletal Muscle Disease
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Quantitative in vivo T2 mapping using fast spin echo techniques - A linear correction procedure.

Ulrike Nöth1, Manoj Shrestha1, Jan-Rüdiger Schüre2

  • 1Brain Imaging Center (BIC), Goethe University Frankfurt, Schleusenweg 2-16, D-60528 Frankfurt am Main, Germany.

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Summary
This summary is machine-generated.

This study introduces a novel method to correct stimulated and indirect echoes in quantitative T2 mapping, improving accuracy without needing prior radio frequency pulse knowledge. The technique accurately corrects apparent T2 values, enhancing MRI data reliability.

Keywords:
Fast spin echo (FSE)Quantitative T2 mappingStimulated echoesT2 map correctionTransverse relaxation time T2Turbo spin echo (TSE)

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Area of Science:

  • Magnetic Resonance Imaging
  • Quantitative MRI Techniques

Background:

  • Quantitative T2 mapping is crucial for MRI-based diagnostics.
  • Stimulated and indirect echoes introduce artifacts in T2 mapping.
  • Existing correction methods often require prior knowledge of radio frequency pulse profiles.

Purpose of the Study:

  • To develop a novel method for correcting stimulated and indirect echoes in quantitative T2 mapping.
  • To eliminate the need for a priori radio frequency pulse profile knowledge.
  • To improve the accuracy of T2 mapping in magnetic resonance imaging.

Main Methods:

  • Signal decay curves were simulated for various radio frequency (RF) pulse profiles.
  • Actual signal decay was measured on a phantom to derive approximate RF pulse profiles.
  • A relationship between true T2 and apparent T2 (T2app) was established using simulated and derived RF pulses.
  • Correction of T2app maps was performed using the derived relationship.

Main Results:

  • The relationship between true T2 and apparent T2 (T2app) was found to be approximately linear.
  • A direct correction method for T2app maps was established.
  • B1-independent correction yielded accurate T2 results when RF field amplitude deviation was within 10%.
  • A B1-dependent correction method was also presented.

Conclusions:

  • The proposed method effectively corrects stimulated and indirect echoes in quantitative T2 mapping.
  • The technique offers accurate T2 quantification without requiring prior knowledge of RF pulse profiles.
  • The method is validated both in vitro and in vivo, demonstrating its broad applicability.