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Related Concept Videos

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DefinitionRenal angiography, also known as renal arteriography, is an imaging technique used to obtain a comprehensive view of blood flow and the vascular structure of blood vessels in the kidneys and surrounding areas.PurposeRenal angiography detects blood vessel abnormalities in the kidneys, such as aneurysms, stenosis, thrombosis, vascular tumors, and renal artery stenosis. It evaluates kidney function and guides interventional treatments like angioplasty or stent placement.Pre-Procedure...
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Cardiovascular magnetic resonance imaging, or CMRI, is a non-invasive diagnostic test that employs a magnetic field and radiofrequency waves to create precise images of the heart and arteries. It provides comprehensive information about cardiac anatomy, function, perfusion, and tissue characterization without ionizing radiation.IndicationsCMRI diagnoses various heart conditions, including tissue damage from heart attacks, ischemic heart disease, myocarditis, aortic issues (tears, aneurysms,...
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An Optimized Encoding Scheme for Planning Vessel-Encoded Pseudocontinuous Arterial Spin Labeling.

Eleanor S K Berry1, Peter Jezzard1, Thomas W Okell1

  • 1Centre for Functional Magnetic Resonance Imaging of the Brain, Nuffield Department of Clinical Neurosciences, University of Oxford, Oxford, UK.

Magnetic Resonance in Medicine
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A new automated method optimizes vessel-encoded pseudocontinuous arterial spin labeling (pcASL) for improved signal-to-noise ratio (SNR). This rapid technique enhances vascular imaging for any vessel arrangement, outperforming random encoding methods.

Keywords:
SNR efficiencyencoding schemeperfusionvessel-encoded pseudocontinuous arterial spin labelingvessel-selective

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Area of Science:

  • Medical Imaging
  • Biomedical Engineering
  • Neuroimaging

Background:

  • Vessel-encoded pseudocontinuous arterial spin labeling (pcASL) enables vessel-selective angiography and perfusion mapping.
  • Current pcASL encoding methods are limited to few vessels and may not optimize signal-to-noise ratio (SNR).

Purpose of the Study:

  • To develop an automated, rapid method for calculating SNR-optimal encodings for pcASL.
  • To enable optimal vessel selection for any number and arrangement of vessels.

Main Methods:

  • Introduced an optimized encoding scheme (OES), a Fourier-based method for calculating SNR-optimized encodings.
  • The OES calculation takes less than 3 seconds for up to nine vessels.

Main Results:

  • Simulations showed OES encodings achieved 37% greater average SNR efficiency compared to random encodings across various vessel geometries.
  • In vivo studies on healthy subjects demonstrated OES encodings produced higher SNR images of neck vessels.

Conclusions:

  • The OES method generates a minimal set of encodings with superior SNR efficiency.
  • OES is effective regardless of the number or geometric arrangement of target vessels.