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Oxygen-17 contrast agents. Fast imaging techniques.

A L Hopkins1, E M Haacke, R G Barr

  • 1Case Western Reserve University, Department of Anatomy, Cleveland, OH 44106.

Investigative Radiology
|September 1, 1988
PubMed
Summary
This summary is machine-generated.

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Oxygen-17 water enhances MRI scans by lowering proton T2 relaxation times in tissues. This stable isotope allows for faster and more sensitive detection of O-17 water concentrations using specific MRI sequences.

Area of Science:

  • Biomedical Imaging
  • Magnetic Resonance Imaging (MRI)
  • Stable Isotope Applications

Background:

  • Physiologic conditions involve stable isotopes like oxygen-17 (O-17) water.
  • Proton T2 relaxation times in biological tissues are affected by O-17 water.
  • Magnetic Resonance Imaging (MRI) is a key diagnostic tool.

Purpose of the Study:

  • To investigate the effect of O-17 water on proton T2 relaxation.
  • To evaluate MRI detection sensitivity and speed using different pulse sequences.
  • To determine the minimum detectable concentration of O-17 water.

Main Methods:

  • Utilized O-17 water under physiologic conditions.
  • Employed spin-echo pulse sequences for MRI detection.
  • Applied steady-state free precession (FISP) sequences for enhanced sensitivity and speed.

Related Experiment Videos

Main Results:

  • O-17 water demonstrably lowers proton T2 in blood, CSF, tissues, and whole organisms.
  • FISP sequences offer significantly greater sensitivity and speed compared to spin-echo.
  • Detection of O-17 water at concentrations as low as 0.4% was achieved within 53 seconds.

Conclusions:

  • O-17 water is a valuable tool for enhancing MRI contrast and detection.
  • FISP sequences provide a highly sensitive and rapid method for O-17 MRI.
  • This technique enables sensitive detection of low O-17 water concentrations in biological systems.