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Related Concept Videos

Aortic Regurgitation II: Clinical Features and Diagnostic Tests01:22

Aortic Regurgitation II: Clinical Features and Diagnostic Tests

Aortic valve regurgitation (AR) occurs when the aortic valve fails to close properly, allowing blood to flow backward from the aorta into the left ventricle. This backflow can result in two distinct clinical presentations: acute and chronic AR, each characterized by its own set of symptoms and physical findings.Acute Aortic RegurgitationAcute AR presents with a sudden onset of severe symptoms. Patients typically experience profound dyspnea (shortness of breath), chest pain, and signs of left...
Imaging Studies for Cardiovascular System V: CT01:28

Imaging Studies for Cardiovascular System V: CT

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...
Imaging Studies for Cardiovascular System VI: Calcium -Scoring CT01:25

Imaging Studies for Cardiovascular System VI: Calcium -Scoring CT

Calcium-Scoring CT ScanA calcium-scoring CT scan, also known as coronary artery calcium (CAC) scan, detects calcium deposits in the coronary arteries. This test assesses the risk of coronary artery disease (CAD), which can lead to cardiovascular events such as angina, heart failure, and sudden cardiac arrest.A calcium-scoring CT scan is generally recommended for individuals at intermediate risk of CAD without symptoms. It includes:Men aged 40-75 and women aged 50-75: Especially those with a...
Thoracic Aorta01:15

Thoracic Aorta

The thoracic section of the aorta begins at the T5 vertebra and extends to the T12 level at the diaphragm, initially progressing through the mediastinum to the left of the spinal column. Throughout its course in the thoracic segment, the thoracic aorta emits various offshoots known collectively as visceral and parietal branches. The branches that predominantly supply blood to visceral organs are termed visceral branches and include bronchial, pericardial, esophageal, and mediastinal arteries,...
Aortic Regurgitation I: Introduction01:15

Aortic Regurgitation I: Introduction

IntroductionAortic regurgitation is characterized by the backward flow of blood from the aorta into the left ventricle during diastole and arises from the improper closure of the aortic valve. This condition results in left ventricular volume overload and can stem from both acute and chronic etiologies, each contributing uniquely to the disease's progression and symptomatology.Acute and Chronic CausesAcute aortic regurgitation often results from events that suddenly impair the integrity of the...

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Related Experiment Video

Updated: May 13, 2026

Improved Registration of 3D CT Angiography with X-ray Fluoroscopy for Image Fusion During Transcatheter Aortic Valve Implantation
06:59

Improved Registration of 3D CT Angiography with X-ray Fluoroscopy for Image Fusion During Transcatheter Aortic Valve Implantation

Published on: June 3, 2018

Surface-Based CT-TEE Registration of the Aortic Root.

Pencilla Lang, Michael W A Chu, Dan Bainbridge

    IEEE Transactions on Bio-Medical Engineering
    |March 12, 2013
    PubMed
    Summary
    This summary is machine-generated.

    This study evaluates a new imaging guidance system for transcatheter aortic valve implantation (TAVI). The system uses CT-derived surfaces and transesophageal echo (TEE) images to improve valve positioning and reduce complications.

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    Improved Registration of 3D CT Angiography with X-ray Fluoroscopy for Image Fusion During Transcatheter Aortic Valve Implantation
    06:59

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    Published on: June 3, 2018

    Time-Resolved, Dynamic Computed Tomography Angiography for Characterization of Aortic Endoleaks and Treatment Guidance via 2D-3D Fusion-Imaging
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    An Approach to Point-Of-Care Ultrasound Evaluation of the Abdominal Aorta
    07:12

    An Approach to Point-Of-Care Ultrasound Evaluation of the Abdominal Aorta

    Published on: September 8, 2023

    Area of Science:

    • Cardiovascular Surgery
    • Medical Imaging
    • Biomedical Engineering

    Background:

    • Transcatheter aortic valve implantation (TAVI) is a minimally invasive procedure for severe aortic stenosis.
    • Current TAVI guidance relies on single-plane fluoroscopy, offering limited anatomical detail.
    • Inadequate imaging during TAVI can lead to serious complications like valve embolism and paravalvular leak.

    Purpose of the Study:

    • To evaluate the accuracy and robustness of a surface-based registration method for intraoperative TAVI guidance.
    • To compare the performance of different transesophageal echo (TEE) surface extraction techniques for TAVI navigation.
    • To assess the potential of an improved visualization system to reduce TAVI-related complications.

    Main Methods:

    • Development and evaluation of a surface-based registration technique using CT-derived surfaces and intraoperative TEE images.
    • Comparison of various TEE surface extraction methods for accuracy in TAVI guidance.
    • Assessment of registration errors and clinical applicability of the proposed system.

    Main Results:

    • The surface-based registration method demonstrated high accuracy, with registration errors below 5 mm when using cross-plane TEE contours.
    • The proposed guidance system requires minimal intraoperative workflow modification and no additional hardware.
    • The system is cost-effective and can be implemented in all cardiac centers.

    Conclusions:

    • Intraoperative registration of CT-derived surfaces to TEE images offers improved visualization for TAVI.
    • The cross-plane TEE contour method provides the most accurate results for TAVI guidance.
    • This low-cost, minimally invasive guidance system has the potential to enhance TAVI safety and outcomes.