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Related Concept Videos

Assessment of radial pulse01:11

Assessment of radial pulse

Assessment of Radial Pulse
The radial pulse, located at the wrist, is often the preferred site for assessing peripheral pulse because of its accessibility and dependability. The process of determining the radial pulse involves several steps:
Assessment of apical radial pulse01:25

Assessment of apical radial pulse

Apical-Radial (A-R) Pulse Assessment
The A-R pulse assessment involves simultaneous evaluation of the apical and radial pulses. When the apical and radial pulse rates vary, this assessment helps identify a pulse deficit.
Pre-Procedural Preparation
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...
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...
Imaging Studies for Cardiovascular System IV: CMRI01:21

Imaging Studies for Cardiovascular System IV: CMRI

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,...
Radiological Investigation II: MRI and Ventilation Perfusion Scan01:30

Radiological Investigation II: MRI and Ventilation Perfusion Scan

Description
Magnetic Resonance Imaging (MRI) and Ventilation Perfusion Scans are two radiological investigations that offer detailed diagnostic images of the body, particularly lung structures.
MRI
MRI uses magnetic fields and radiofrequency signals to distinguish between normal and abnormal tissues. This technology provides a more detailed diagnostic image than CT scans, enabling it to characterize pulmonary nodules, stage bronchogenic carcinoma, and evaluate inflammatory activity in...

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Related Experiment Video

Updated: Jul 15, 2026

Multi-Tracer Studies of Brain Oxygen and Glucose Metabolism Using a Time-of-Flight Positron Emission Tomography-Computed Tomography Scanner
08:36

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Perfusion MRI with radial acquisition for arterial input function assessment.

Eugene G Kholmovski1, Edward V R DiBella

  • 1Utah Center for Advanced Imaging Research, Department of Radiology, University of Utah, Salt Lake City, Utah 84108, USA. ekhoumov@ucair.med.utah.edu

Magnetic Resonance in Medicine
|April 26, 2007
PubMed
Summary

This study shows radial acquisition enables accurate myocardial perfusion imaging by optimizing contrast agent concentration assessment. It overcomes trade-offs between arterial input function accuracy and signal-to-noise ratio for tissue enhancement curves.

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Magnetic Resonance Imaging Quantification of Pulmonary Perfusion using Calibrated Arterial Spin Labeling
12:29

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Published on: May 30, 2011

Area of Science:

  • Cardiovascular Imaging
  • Medical Physics
  • Radiology

Background:

  • Accurate quantification of myocardial perfusion relies on precise arterial input function (AIF) and tissue enhancement curves (TECs).
  • Existing methods face challenges with the trade-off between AIF accuracy and TEC signal-to-noise ratio (SNR) due to pulse sequence saturation recovery time (SRT).

Purpose of the Study:

  • To demonstrate the feasibility of using radial acquisition for quantitative myocardial perfusion imaging.
  • To resolve the trade-off between AIF accuracy and TEC SNR in myocardial perfusion quantification.

Main Methods:

  • Utilized radial k-space sampling to reconstruct images with varied saturation recovery times (SRTs) from a single data set.
  • Enabled accurate assessment of arterial input functions (AIFs) and tissue enhancement curves (TECs).
  • Facilitated conversion of AIF and TEC data to contrast agent (CA) concentration.

Main Results:

  • Radial acquisition allows for accurate estimation of both AIF and TECs.
  • Overcomes limitations associated with fixed SRTs in conventional pulse sequences.
  • Demonstrates feasibility for quantitative myocardial perfusion imaging.

Conclusions:

  • Radial acquisition is a viable technique for quantitative myocardial perfusion imaging.
  • This method effectively addresses the accuracy-SNR trade-off in perfusion quantification.
  • Offers improved assessment of contrast agent dynamics in the myocardium.