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Hyperpolarized 13C Metabolic Magnetic Resonance Spectroscopy and Imaging
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Hyperpolarized (13)C MR Angiography.

Kasper W Lipsø, Peter Magnusson, Jan Henrik Ardenkjaer-Larsen1

  • 1DTU Electrical Engineering, Ørsteds Plads, Building 349, room 106, 2800 Kgs. Lyngby, Denmark. jhar@elektro.dtu.dk.

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Summary
This summary is machine-generated.

Hyperpolarized 13C agents enhance magnetic resonance angiography (MRA) imaging. While balanced steady-state free precession (bSSFP) sequences offer higher signal-to-noise ratio for intravenous injections, gradient echo (GRE) sequences are preferred for intra-arterial injections due to fewer artifacts.

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Area of Science:

  • Medical Imaging
  • Cardiovascular Disease Research
  • Hyperpolarized Contrast Agents

Background:

  • Cardiovascular disease is a leading global cause of mortality.
  • Magnetic Resonance Angiography (MRA) is crucial for diagnosis and monitoring.
  • Hyperpolarized imaging agents offer significant signal enhancement, potentially reducing acquisition times and improving resolution.

Purpose of the Study:

  • To review the literature on hyperpolarized 13C agents in MR angiography.
  • To investigate the benefits of intra-arterial versus intravenous injection of hyperpolarized agents for cerebral angiography in rats.
  • To compare the performance of gradient echo (GRE) and balanced steady-state free precession (bSSFP) sequences for hyperpolarized MRA.

Main Methods:

  • Literature review of hyperpolarized 13C agents for MRA.
  • In vivo study in rats comparing intra-arterial and intravenous injection of hyperpolarized agents.
  • Acquisition of 2D coronal cerebral angiographies using GRE and bSSFP sequences with varying resolutions and matrix sizes.

Main Results:

  • The bSSFP sequence demonstrated higher signal-to-noise ratio (SNR) in phantoms and for intravenous injections compared to GRE.
  • GRE sequences avoided signal destruction observed with bSSFP for intravenous injections.
  • For intra-arterial injections, GRE sequences were preferred due to fewer artifacts compared to bSSFP.

Conclusions:

  • Hyperpolarized MRA shows promise but faces challenges and cannot yet replace conventional contrast-enhanced MRA.
  • The choice of pulse sequence (GRE vs. bSSFP) is critical and depends on the injection method (intra-arterial vs. intravenous).
  • Further research into hyperpolarization techniques is needed to overcome current limitations and improve clinical applicability.