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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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Phase Contrast Magnetic Resonance Imaging in the Rat Common Carotid Artery
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Improved cardiovascular flow quantification with time-resolved volumetric phase-contrast MRI.

Albert Hsiao1, Marcus T Alley, Payam Massaband

  • 1Department of Radiology, 725 Welch Road, Stanford, CA 94305-5654, USA.

Pediatric Radiology
|January 12, 2011
PubMed
Summary

Time-resolved volumetric 4-D flow MRI offers more consistent cardiovascular flow quantification than traditional 2-D phase-contrast MRI (2-D PC-MRI). This advanced technique improves accuracy in assessing blood flow rates in clinical populations.

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Area of Science:

  • Cardiovascular imaging
  • Medical physics
  • Radiology

Background:

  • Two-dimensional phase-contrast MRI (2-D PC-MRI) is standard for cardiovascular flow assessment.
  • 2-D PC-MRI requires lengthy scan prescription, physician oversight, and yields inconsistent results.
  • Time-resolved volumetric 4-D flow MRI presents a potential solution to these limitations.

Purpose of the Study:

  • To evaluate the agreement and internal consistency of flow quantification between 2-D PC-MRI and 4-D flow MRI.
  • To compare the accuracy of these techniques in a clinical patient cohort.

Main Methods:

  • Developed Java software for 4-D flow data analysis.
  • Included 18 patients undergoing both 2-D PC-MRI and 4-D flow imaging.
  • Assessed aortic and pulmonary artery flow rates using both MRI techniques.

Main Results:

  • Both 2-D PC-MRI and 4-D flow MRI showed general agreement in flow rates (ρ: 0.87-0.90).
  • 4-D flow MRI demonstrated closer matching and higher correlation of systemic and pulmonary arterial flow rates (ρ: 0.98-0.99) compared to 2-D PC-MRI (ρ: 0.93).
  • In patients without regurgitation, 4-D flow maintained tight correlation (ρ: 0.99-1.00) while 2-D showed improved correlation (ρ: 0.99).

Conclusions:

  • 4-D flow MRI provides more consistent cardiovascular flow quantification than conventional 2-D PC-MRI.
  • This volumetric technique enhances the reliability of blood flow assessment in clinical settings.