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Related Concept Videos

Imaging Studies for Cardiovascular System V: CT01:28

Imaging Studies for Cardiovascular System V: CT

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Cardiac computed tomography (CT) scanning is an advanced cardiac imaging technique that utilizes CT technology, with or without intravenous (IV) contrast, to produce accurate cross-sectional virtual slices of specific areas of the heart, coronary circulation, and major blood vessels such as the aorta, pulmonary veins, and arteries. The computer processes these slices to generate three-dimensional images. Multidetector CT (MDCT) is a rapid form of CT scanning that captures multiple slices...
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Imaging Studies for Cardiovascular System I:Echocardiography01:17

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Cardiac imaging studies encompass a wide range of noninvasive and minimally invasive techniques designed to visualize the heart's structure and function in detail. One such technique is echocardiography, which uses high-frequency ultrasound waves to produce detailed images of the heart, known as echocardiograms.
Indications: Echocardiography is utilized to diagnose heart failure, valve disorders, and myocardial infarction. It also assesses cardiac structures' size, shape, and motion,...
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Related Experiment Video

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Retrospective Cardiac Gating with A Prototype Small-Animal X-ray Computed Tomograph
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Pseudo-projection-driven, self-gated cardiac cine imaging using cartesian golden step phase encoding.

Liheng Guo1, J Andrew Derbyshire2, Daniel A Herzka1

  • 1Department of Biomedical Engineering, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.

Magnetic Resonance in Medicine
|November 1, 2015
PubMed
Summary
This summary is machine-generated.

This study introduces a new cardiac MRI method using pseudo-projections for free-breathing imaging. This technique enables accurate cardiac and respiratory motion tracking without ECG, offering comparable image quality to standard scans.

Keywords:
cardiac imaginggolden stepmotion trackingpseudo-projectionsrespiratory motionself-gatingself-navigation

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Area of Science:

  • Medical Imaging
  • Cardiovascular MRI
  • Image Reconstruction

Background:

  • Free-breathing cardiac MRI is challenging due to respiratory and cardiac motion.
  • Existing techniques often require electrocardiogram (ECG) gating or complex motion tracking.
  • Minimizing motion-detection overhead and planning is crucial for efficient cardiac cine acquisition.

Purpose of the Study:

  • To develop and evaluate a novel two-dimensional self-gated imaging technique for free-breathing cardiac cine MRI.
  • To achieve motion tracking free of motion-detection overhead and minimal planning.
  • To enable non-electrocardiogram (ECG) gated cine acquisition.

Main Methods:

  • Motion along the readout direction was extracted from Cartesian imaging readouts near ky = 0.
  • "Pseudo-projections" were created by scaling and filtering readouts below a |ky| threshold.
  • A discrete golden step phase encode scheme allowed flexible |ky| threshold setting post-scan for uniform motion sampling.

Main Results:

  • The pseudo-projections stream provided sufficient spatiotemporal resolution for cardiac and respiratory tracking.
  • Retrospective reconstruction of free-breathing, non-ECG cines was enabled.
  • Image quality, including boundary sharpness and myocardial mass, was comparable to standard breath-hold ECG-gated cines.

Conclusions:

  • Pseudo-projections are feasible for cardiorespiratory self-gated imaging.
  • The technique simplifies acquisition for self-gated cardiac MRI.
  • Despite minor sensitivities, it offers a valuable tool for cardiac imaging.