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Imaging Studies III: Computed Tomography01:27

Imaging Studies III: Computed Tomography

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DefinitionComputed Tomography (CT) of the genitourinary (GU) tract is a non-invasive imaging modality that utilizes X-rays and computer processing to generate detailed cross-sectional images of the urinary system, encompassing the kidneys, ureters, bladder, and adjacent structures such as the adrenal glands.PurposeCT scans of the GU tract serve several diagnostic and therapeutic purposes, including:Diagnosis of Urinary Tract Diseases: Detects kidney stones, tumors, cysts, and congenital...
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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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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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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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Cardiovascular magnetic resonance imaging, or CMRI, is a non-invasive diagnostic test that employs a magnetic field and radiofrequency waves to create precise images of the heart and arteries. It provides comprehensive information about cardiac anatomy, function, perfusion, and tissue characterization without ionizing radiation.IndicationsCMRI diagnoses various heart conditions, including tissue damage from heart attacks, ischemic heart disease, myocarditis, aortic issues (tears, aneurysms,...
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Positron Emission Tomography (PET) is a medical imaging technique that provides crucial insights into the body's physiological functions at a molecular level. It is an indispensable resource for diagnosing, staging, and monitoring various illnesses, notably cancer, neurological disorders, and cardiovascular conditions.
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Computed tomography coronary stent imaging with iterative reconstruction: a trade-off study between medium kernel and

Qijing Zhou1, Biao Jiang, Fei Dong

  • 1From the *Department of Radiology, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China; and †Healthcare Sector, Siemens Ltd. China, Shanghai, China.

Journal of Computer Assisted Tomography
|March 22, 2014
PubMed
Summary
This summary is machine-generated.

Iterative Reconstruction in Image Space (IRIS) significantly reduces CT coronary angiography noise. Sharp kernel IRIS provides optimal visualization of coronary stents, improving image quality.

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Area of Science:

  • Radiology
  • Medical Imaging
  • Cardiovascular Imaging

Background:

  • Computed tomographic coronary angiography (CTCA) is crucial for evaluating coronary stents.
  • Image noise can hinder accurate stent assessment.
  • Iterative reconstruction techniques aim to improve image quality.

Purpose of the Study:

  • To assess the effectiveness of Iterative Reconstruction in Image Space (IRIS) for CTCA stent imaging.
  • To compare IRIS with sharp kernel against standard filtered back projection (FBP).
  • To analyze the trade-offs in image quality and noise reduction.

Main Methods:

  • 128-slice dual-source CTCA was performed on 56 patients (105 stents).
  • Images were reconstructed using FBP and IRIS (medium and sharp kernels).
  • Objective (noise, diameter) and subjective (noise/stent scores) evaluations were conducted.

Main Results:

  • IRIS significantly reduced noise in both background vessels and in-stent lumens compared to FBP.
  • Sharp kernel IRIS demonstrated superior visualization of stent struts and lumen.
  • Noise reduction was approximately 30.3% in sharp kernel background and 27.0% in sharp kernel in-stent lumen.

Conclusions:

  • IRIS effectively reduces image noise in CTCA.
  • Sharp kernel IRIS enhances visualization of coronary stents.
  • IRIS with sharp kernel is optimal for coronary stent imaging.