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Related Concept Videos

Imaging Studies for Cardiovascular System III: X-Ray01:20

Imaging Studies for Cardiovascular System III: X-Ray

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The most common cardiovascular diagnostic test is an X-ray. It produces images of the heart, blood vessels, and adjacent structures.
Definition and Purpose
An X-ray, or radiograph, is a non-invasive method that uses ionizing radiation to take images of internal structures. It is mainly used in cardiac imaging to examine the heart, lungs, and major blood vessels, aiming to identify abnormalities in the heart's size, shape, and position, such as heart failure, congenital defects, and vascular...
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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.
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Computed Tomography01:10

Computed Tomography

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Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...
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Electrocardiogram01:29

Electrocardiogram

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An electrocardiogram (ECG or EKG) is a critical diagnostic tool that records the electrical signals produced by the heart during each heartbeat. This recording is achieved through electrodes placed strategically on the arms, legs, and chest. The electrocardiograph amplifies these signals and produces 12 distinct tracings, offering a comprehensive understanding of the heart's electrical activity.
Three major waveforms are present in a typical ECG recording: the P wave, the QRS complex, and...
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Imaging Studies for Cardiovascular System II:Types of Echocardiography01:20

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Echocardiography plays a role in assessing cardiac health and detecting heart conditions, with various types providing critical insights for diagnosis and treatment.
Types of Echocardiography
Transthoracic Echocardiography (TTE)
TTE is the most common type of echocardiogram which involves placing a transducer on the patient's chest, emitting sound waves to create heart images. TTE is invaluable for evaluating the heart's size, structure, and motion, making it particularly useful for...
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Radiological Investigation III: Pulmonary Angiogram and PET Scan01:13

Radiological Investigation III: Pulmonary Angiogram and PET Scan

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Radiological investigations are paramount in the diagnosis and management of various pulmonary diseases. Two essential investigations are the Pulmonary Angiogram and the Positron Emission Tomography (PET) Scan.
Pulmonary Angiogram
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Related Experiment Video

Updated: May 9, 2025

Real-Time Cardiac Mapping with a Noninvasive Imageless Electrocardiographic Imaging System
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Coronary computed tomography angiography without ECG leads; A feasibility study.

Brian Thomsen1, Ali Nabipoor2, Sanaz Asadian2

  • 1GE HealthCare, 3000 N Grandview Blvd, W-1120, Waukesha, WI 53188, United States.

Current Problems in Diagnostic Radiology
|May 6, 2025
PubMed
Summary

Coronary CT angiography (CCTA) is feasible without ECG triggering using advanced CT scanners. This innovation enhances patient comfort, streamlines workflow, and broadens access to CCTA procedures.

Keywords:
Coronary CT angiographyECG-lessImage qualityMotion correction

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Area of Science:

  • Cardiovascular Imaging
  • Radiology
  • Medical Technology

Background:

  • Modern CT scanners offer high temporal resolution and wide coverage, enabling robust coronary CT angiography (CCTA).
  • Advanced algorithms for automated phase selection and motion correction improve CCTA quality, even with high heart rates or arrhythmias.
  • This technology suggests the possibility of performing CCTA without electrocardiogram (ECG) triggering.

Purpose of the Study:

  • To evaluate the feasibility of performing CCTA without ECG triggering using advanced CT scanner technology.
  • To assess the image quality and potential benefits of an ECG-less CCTA approach.

Main Methods:

  • Prospective enrollment of 43 subjects undergoing clinically indicated CCTA.
  • Acquisition of ECG-less CCTA data over the entire cardiac cycle using a wide-coverage, fast-rotation CT scanner.
  • Image reconstruction using seven data sub-ranges and expert evaluation of motion artifacts on a 6-point Likert scale.

Main Results:

  • Overall image quality with motion correction was significantly higher than standard reconstruction (4.6 vs. 4.0, p < 0.01).
  • Image quality remained high across different heart rates (≤60 bpm: 4.9; 61-70 bpm: 4.5; ≥71 bpm: 4.4).
  • Image quality from data sub-ranges was comparable to full-phase reconstruction, with minor variations at specific heart rates.

Conclusions:

  • Coronary CT angiography (CCTA) without ECG leads is feasible on advanced CT scanners.
  • This ECG-less approach has the potential to improve patient comfort and workflow efficiency.
  • The findings suggest increased accessibility to CCTA examinations.