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Related Concept Videos

Blood Flow01:29

Blood Flow

Blood is pumped by the heart into the aorta, the largest artery in the body, and then into increasingly smaller arteries, arterioles, and capillaries. The velocity of blood flow decreases with increased cross-sectional blood vessel area. As blood returns to the heart through venules and veins, its velocity increases. The movement of blood is encouraged by smooth muscle in the vessel walls, the movement of skeletal muscle surrounding the vessels, and one-way valves that prevent backflow.
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...

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Related Experiment Video

Updated: Jun 7, 2026

Blood Flow Imaging with Ultrafast Doppler
05:57

Blood Flow Imaging with Ultrafast Doppler

Published on: October 14, 2020

Two-dimensional flow index mapping for hemodynamic imaging: a feasibility study.

Liang Zhang1, Orpheus Kolokythas, Manjiri Dighe

  • 1Image Computing Systems Laboratory, Department of Bioengineering, University of Washington, Seattle, WA 98195-5061, USA.

Ultrasound in Medicine & Biology
|October 30, 2010
PubMed
Summary
This summary is machine-generated.

Two-dimensional flow index mapping (2D-FIM) offers a novel way to visualize kidney resistive index (RI) distribution. This ultrasound technique accurately maps RI across the entire kidney, potentially improving vascular disease assessment.

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Area of Science:

  • Medical Imaging
  • Ultrasound Technology
  • Nephrology

Background:

  • Resistive index (RI) assesses kidney vascular disease by measuring flow resistance.
  • Conventional spectral Doppler ultrasound measures RI at single points, limiting comprehensive assessment.
  • Current methods provide limited spatial information on intrarenal RI distribution.

Purpose of the Study:

  • To develop and evaluate a novel method, two-dimensional flow index mapping (2D-FIM), for visualizing the spatial distribution of RI.
  • To assess the feasibility of 2D-FIM in healthy kidneys and kidney transplant recipients.
  • To compare RI values obtained by 2D-FIM with conventional spectral Doppler ultrasound.

Main Methods:

  • Developed 2D-FIM to calculate the spatial distribution of RI values from quadrature-demodulated baseband Doppler data.
  • Conducted a feasibility study using 16 kidney datasets (8 healthy, 8 transplant recipients).
  • Compared 2D-FIM derived RI values with measurements from conventional spectral Doppler ultrasound.

Main Results:

  • 2D-FIM successfully calculated the spatial distribution of RI values.
  • A high Pearson correlation coefficient of 0.84 was found between 2D-FIM and spectral Doppler US RI values.
  • No significant difference was observed between RI values obtained from 2D-FIM and conventional spectral Doppler ultrasound.

Conclusions:

  • 2D-FIM is a feasible method for visualizing the two-dimensional distribution of intrarenal RI.
  • 2D-FIM demonstrates strong agreement with conventional spectral Doppler ultrasound for RI measurement.
  • This technique could guide spectral Doppler gate placement to abnormal RI regions, potentially shortening examination times.