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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 I:Echocardiography01:17

Imaging Studies for Cardiovascular System I:Echocardiography

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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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Imaging Studies for Cardiovascular System II:Types of Echocardiography01:20

Imaging Studies for Cardiovascular System II:Types of Echocardiography

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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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Mitral Regurgitation I: Introduction01:20

Mitral Regurgitation I: Introduction

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Mitral regurgitation is characterized by the backward circulation of blood from the left ventricle to the left atrium during systole, a phase of the cardiac cycle when the heart contracts and pumps blood out of the chambers. This abnormal flow occurs primarily due to the dysfunction of the mitral valve or its supporting structures, which include the mitral leaflets, chordae tendineae, annulus, and papillary muscles.Etiology and Mechanisms:Primary Mitral Regurgitation: This type arises from...
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Mitral Stenosis II: Clinical features and Diagnostic Tests01:23

Mitral Stenosis II: Clinical features and Diagnostic Tests

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Mitral stenosis is a heart condition in which the mitral valve, which allows blood to flow from the left atrium to the left ventricle, becomes narrowed or stenotic. This narrowing hinders blood flow and leads to clinical symptoms requiring specific medical evaluations and management strategies. The following overview outlines the clinical symptoms, assessments, diagnostic findings, prevention methods, and treatments for mitral stenosis.Clinical ManifestationsDyspnea (shortness of breath): This...
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Acute Coronary Syndrome III: Diagnostic Studies01:30

Acute Coronary Syndrome III: Diagnostic Studies

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Diagnosing acute coronary syndrome or ACS begins with a thorough patient history. Notable symptoms include central, crushing chest pain radiating to the left arm, neck, jaw, or back, along with shortness of breath, sweating (diaphoresis), nausea, vomiting, dizziness, and palpitations.It is crucial to note any history of cardiac illnesses and assess risk factors, including age, gender, smoking, hypertension, diabetes, hyperlipidemia, and a sedentary lifestyle.During physical examination, vital...
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Video Experimental Relacionado

Updated: May 6, 2026

Displacement Analysis of Myocardial Mechanical Deformation DIAMOND Reveals Segmental Heterogeneity of Cardiac Function in Embryonic Zebrafish
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Displacement Analysis of Myocardial Mechanical Deformation DIAMOND Reveals Segmental Heterogeneity of Cardiac Function in Embryonic Zebrafish

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Marco de análisis del movimiento ventricular izquierdo para el estudio MATRIX-VT

Christian Janorschke1, Sorin S Popescu2,3, Jonas Osburg4

  • 1Institute of Robotics and Cognitive Systems, University of Lübeck, Ratzeburger Allee 160, Lübeck, 23652, Germany. ch.janorschke@uni-luebeck.de.

International journal of computer assisted radiology and surgery
|September 5, 2025
PubMed
Resumen
Este resumen es generado por máquina.

Este estudio presenta un marco para la transferencia de datos de movimiento de ultrasonido a coordenadas de TC para la terapia de radioablación de arritmia estereotáctica, mejorando la gestión del movimiento en tiempo real durante la administración de radiación.

Palabras clave:
Ecocardiografía en 3DMovimiento del ventrículo izquierdoRadioablación de la arritmia estereotácticaUltrasonido y fusión por tomografía computarizada

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Área de la Ciencia:

  • Física médica
  • Tecnología de radioterapia
  • Intervenciones guiadas por imágenes

Sus antecedentes:

  • La ecografía (US) es crucial para evaluar la función cardíaca.
  • La terapia de radioablación de la arritmia estereotáctica (STAR) requiere un manejo preciso del movimiento cardiorrespiratorio.
  • Los datos de movimiento en tiempo real en coordenadas de tomografía computarizada (TC) son esenciales para la precisión de la entrega de radiación.

Objetivo del estudio:

  • Desarrollar y validar un marco de análisis de movimiento para la transferencia de datos de movimiento de ultrasonido 3D (US) a coordenadas de TC.
  • Para permitir el seguimiento y la compensación del movimiento en tiempo real en la terapia de radioablación de arritmia estereotáctica (STAR).
  • Integrar la información de movimiento con sede en los Estados Unidos en los sistemas de planificación y entrega de radiación.

Principales métodos:

  • Utilizó una configuración de prueba robótica con un fantasma humano para la adquisición de datos.
  • Se utiliza un sistema de seguimiento óptico y un fantasma de calibración espacial para la determinación de la transformación.
  • Métodos de ajuste de cuadros, calibración, registro y evaluación para el análisis del movimiento.

Principales resultados:

  • Logró una velocidad de fotogramas superior a 20 Hz con una calidad de imagen aceptable en los Estados Unidos.
  • Se demostró un desplazamiento entre el tiempo de activación de la TC y la grabación de EE.UU. de 2-20 ms.
  • Los pasos individuales de fusión US-CT alcanzaron una precisión de < 5 mm, pero el error acumulado excedió los límites en posiciones extremas de la sonda.

Conclusiones:

  • El marco desarrollado está validado para el estudio MATRIX- VT y la evaluación de los datos de los pacientes.
  • Facilita la transferencia de datos posicionales para el movimiento de estructuras anatómicas entre US y CT para la gestión predictiva del movimiento en la terapia STAR.
  • El diseño modular permite futuras mejoras en la calibración y el registro para superar las limitaciones de posicionamiento de la sonda.