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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 III: X-Ray01:20

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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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Acute Coronary Syndrome III: Diagnostic Studies01:30

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

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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...
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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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Mitral Stenosis II: Clinical features and Diagnostic Tests01:23

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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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Cardiac Amyloidosis Imaging, Part 2: Quantification and Technical Considerations.

Eric J Schockling1, Mary Beth Farrell2, Monica Embry-Dierson3

  • 1Outpatient Cardiovascular Diagnostics, Norton Healthcare, LLC, Louisville, Kentucky.

Journal of Nuclear Medicine Technology
|June 2, 2023
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Technetium-99m pyrophosphate (99mTc-PYP) imaging is now a key tool for diagnosing cardiac amyloidosis. A standardized protocol, including specific imaging times and analysis methods, ensures accurate detection and grading of this condition.

Keywords:
3-h imagingblood poolcardiac amyloidosisheart–to–contralateral-lung ratio (H/CL)semiquantitative scoring

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Area of Science:

  • Nuclear Medicine
  • Cardiology
  • Radiology

Background:

  • 99mTc-PYP imaging was initially used for myocardial infarction but is now crucial for diagnosing cardiac amyloidosis.
  • Increased utilization has highlighted the need for standardized imaging and interpretation protocols.
  • Expert consensus recommendations were developed to address procedural variability.

Purpose of the Study:

  • To detail the evolution of 99mTc-PYP imaging procedures for cardiac amyloidosis.
  • To describe image processing, quantification, and radiotracer kinetics.
  • To discuss critical technical considerations like injection-to-imaging delay and imaging modalities (planar vs. SPECT).

Main Methods:

  • Standardized protocol involves injecting 370-740 MBq (10-20 mCi) of 99mTc-PYP with imaging at 3 hours.
  • Planar chest images (anterior, lateral) and SPECT images are acquired.
  • Semiquantitative grading (0-3 scale) of myocardial uptake versus ribs, and heart-to-contralateral-lung ratio calculation.

Main Results:

  • A SPECT grade of 2 or 3 is considered positive for cardiac amyloidosis.
  • A heart-to-contralateral-lung ratio >1.3 at 3 hours aids in confirming the diagnosis when SPECT findings are positive.
  • The standardized protocol aims to benefit most laboratories by optimizing parameters.

Conclusions:

  • The standardized 99mTc-PYP imaging protocol, including specific timing and analysis, is essential for accurate cardiac amyloidosis diagnosis.
  • Understanding radiotracer kinetics and technical parameters like injection-to-imaging delay is vital.
  • This article is part of a series providing comprehensive guidance on cardiac amyloidosis imaging and interpretation.