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Related Concept Videos

Magnetic Resonance Imaging01:24

Magnetic Resonance Imaging

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...
Imaging Studies IV: Magnetic Resonance Imaging01:27

Imaging Studies IV: Magnetic Resonance Imaging

Introduction:Magnetic Resonance Imaging, or MRI, can include a specialized imaging technique of the urinary system known as Magnetic Resonance Urography (MRU). This radiation-free technique uses strong magnetic fields and radio waves to produce detailed images with the help of a computer. MRU is particularly effective for visualizing fluid-filled structures like the kidneys, ureters, and bladder.Applications of MRI in the Genitourinary SystemKidneys and Ureters: MRI detects tumors, cysts,...
Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...

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High-resolution Functional Magnetic Resonance Imaging Methods for Human Midbrain
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Multidirectional high-moment encoding in phase contrast MRI.

Nicholas R Zwart1, James G Pipe

  • 1Department of Neuroimaging Research, Barrow Neurological Institute, Phoenix, Arizona 85013, USA. nicholas.zwart@chw.edu

Magnetic Resonance in Medicine
|July 5, 2012
PubMed
Summary
This summary is machine-generated.

A new phase contrast MRI method enhances vascular flow imaging efficiency. This technique improves velocity-to-noise ratio by approximately 1.7 times over dual-VENC methods, leading to clearer vessel visualization.

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Area of Science:

  • Medical Imaging
  • Magnetic Resonance Imaging
  • Cardiovascular Imaging

Background:

  • Phase contrast MRI (PC-MRI) offers quantitative flow and morphological imaging.
  • PC-MRI's signal-to-noise ratio (SNR) is linked to measurement parameters.
  • High-moment PC-MRI SNR is limited by phase unaliasing, which is susceptible to noise and intravoxel flow variations.

Purpose of the Study:

  • To introduce a novel, more efficient PC-MRI method for enhanced vascular flow measurement.
  • To improve vessel conspicuity by increasing the efficiency of velocity-to-noise ratio (VNR) gains.
  • To reduce scan time compared to existing dual-VENC techniques.

Main Methods:

  • Developed a new PC-MRI method exploiting relationships between measurement parameters and SNR.
  • Eliminated the need for high-VENC acquisitions typical in dual-VENC methods.
  • Utilized shared information between nonorthogonal measurements for improved efficiency.

Main Results:

  • The proposed method achieves higher VNR gains more efficiently than dual-VENC approaches.
  • Simulations, phantom studies, and in vivo angiography demonstrated the method's noise performance.
  • The new method showed approximately 1.7 times greater VNR efficiency than dual-VENC at the same gradient moment.

Conclusions:

  • The presented PC-MRI technique offers a significant improvement in VNR efficiency.
  • This method provides a more time-efficient approach to quantitative vascular flow imaging.
  • The enhanced efficiency leads to improved vessel conspicuity in PC-MRA.