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Related Concept Videos

Assessment of Diffusion and Perfusion01:17

Assessment of Diffusion and Perfusion

Understanding and evaluating diffusion and perfusion is critical in assessing a patient's respiratory and circulatory health. These processes play key roles in maintaining the body's internal environment, ensuring that tissues receive adequate oxygen while waste products are efficiently removed.
The Role of Diffusion in Respiration
Diffusion is the process by which molecules move from an area of higher concentration to an area of lower concentration. In the respiratory system, this principle...

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Magnetic Resonance Imaging Quantification of Pulmonary Perfusion using Calibrated Arterial Spin Labeling
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SCALE-PWI: A pulse sequence for absolute quantitative cerebral perfusion imaging.

Jessy Mouannes Srour1, Wanyong Shin, Saurabh Shah

  • 1Department of Biomedical Engineering, Northwestern University, 737 North Michigan Avenue, Chicago, IL 60611, USA.

Journal of Cerebral Blood Flow and Metabolism : Official Journal of the International Society of Cerebral Blood Flow and Metabolism
|December 16, 2010
PubMed
Summary
This summary is machine-generated.

A new MRI technique, Self-Calibrated Epi Perfusion-Weighted Imaging (SCALE-PWI), significantly speeds up quantitative measurement of cerebral blood flow and volume. This automated method reduces scan time and improves efficiency for patient-specific perfusion imaging.

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Area of Science:

  • Neuroimaging
  • Medical Physics
  • Radiology

Background:

  • The Bookend technique is a validated MRI method for quantitative cerebral blood flow (CBF) and cerebral blood volume (CBV) measurement.
  • Current Bookend protocols require multiple scans, significant technologist time, and offline processing, limiting clinical efficiency.

Purpose of the Study:

  • To automate and accelerate the Bookend technique using a novel pulse sequence.
  • To reduce scan time and enable online quantitative perfusion map reconstruction.

Main Methods:

  • Development of Self-Calibrated Epi Perfusion-Weighted Imaging (SCALE-PWI), a single-shot echo-planar imaging sequence.
  • SCALE-PWI integrates three modules into a single sequence with a total scan time under 2 minutes.
  • Validation in 19 healthy volunteers comparing SCALE-PWI to the conventional Bookend protocol.

Main Results:

  • Excellent agreement was observed between SCALE-PWI and the conventional Bookend protocol for quantitative CBF (r=0.95, slope=0.98) and CBV (r=0.91, slope=0.94).
  • The SCALE-PWI protocol reduced the total scan time to under 2 minutes.
  • Online reconstruction of quantitative perfusion maps is feasible with SCALE-PWI.

Conclusions:

  • SCALE-PWI offers a validated, single-pulse sequence for rapid, quantitative absolute measurement of cerebral perfusion.
  • This automated technique enhances efficiency and reduces latency in obtaining critical perfusion data.
  • SCALE-PWI represents a significant advancement in MRI-based assessment of cerebral hemodynamics.