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Related Concept Videos

Imaging Studies VII: Vascular Imaging01:19

Imaging Studies VII: Vascular Imaging

DefinitionRenal angiography, also known as renal arteriography, is an imaging technique used to obtain a comprehensive view of blood flow and the vascular structure of blood vessels in the kidneys and surrounding areas.PurposeRenal angiography detects blood vessel abnormalities in the kidneys, such as aneurysms, stenosis, thrombosis, vascular tumors, and renal artery stenosis. It evaluates kidney function and guides interventional treatments like angioplasty or stent placement.Pre-Procedure...
Imaging Studies for Cardiovascular System IV: CMRI01:21

Imaging Studies for Cardiovascular System IV: CMRI

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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Computed Tomography

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...
Imaging Studies III: Computed Tomography01:27

Imaging Studies III: Computed Tomography

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...
Imaging Studies II: Ultrasonography01:24

Imaging Studies II: Ultrasonography

IntroductionUltrasonography, or renal ultrasound, is a noninvasive medical imaging technique that uses high-frequency sound waves to visualize the kidneys, ureters, bladder, and surrounding tissues.Indications for Urinary System UltrasonographyUrinary system ultrasonography is indicated in various clinical scenarios, such as:Kidney Stones (Urolithiasis): To detect and monitor the size and presence of kidney or urinary tract stones.Hydronephrosis: To assess the dilation of the renal pelvis and...
Imaging Studies for Cardiovascular System III: X-Ray01:20

Imaging Studies for Cardiovascular System III: X-Ray

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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Related Experiment Video

Updated: May 13, 2026

Troubleshooting FoCUS Image Acquisition: Patient Positioning, Transducer Manipulation, and Image Optimization
06:50

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Published on: March 3, 2023

Optimizing circular ring arrays for forward-looking IVUS imaging.

Coskun Tekes1, Mustafa Karaman, F Levent Degertekin

  • 1Department of Electronics Engineering, Isik University, Istanbul, Turkey. coskun.tekes@me.gatech.edu

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|February 28, 2013
PubMed
Summary
This summary is machine-generated.

Optimized dual-ring arrays simplify forward-looking intravascular ultrasound (IVUS) systems by reducing channel count. This synthetic phased-array processing enables 3-D real-time imaging with improved side-lobe levels.

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Intravascular Ultrasound Image-Based Finite Element Modeling Approach for Quantifying In Vivo Mechanical Properties of Human Coronary Artery

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Area of Science:

  • Medical Imaging
  • Ultrasound Technology
  • Biomedical Engineering

Background:

  • Forward-looking (FL) catheter-based imaging is crucial for intravascular ultrasound (IVUS) interventions.
  • High channel counts in array-based FL-IVUS systems increase complexity.
  • Synthetic phased-array processing offers a solution to simplify systems and enable 3-D imaging.

Purpose of the Study:

  • To present optimized dual and single circular ring array designs for synthetic phased-array processing in IVUS.
  • To achieve reduced firing counts for simplified system front-ends.
  • To evaluate array designs for improved wideband response and low side lobes.

Main Methods:

  • Investigated dual-ring arrays with separate transmit (Tx) and receive (Rx) elements.
  • Employed a simulated annealing algorithm to determine optimal firing sets.
  • Simulated 1.2-mm-diameter arrays with 64 Tx and 58 Rx elements at 20 MHz and 50%/80% fractional bandwidths.

Main Results:

  • Optimized dual-ring arrays demonstrated an 8 dB improvement in peak near side-lobe level.
  • No widening of the main lobe width was observed compared to full and sparse co-arrays.
  • The optimized designs are suitable for synthetic phased-array processing with reduced firings.

Conclusions:

  • Optimized dual-ring arrays offer significant advantages for FL-IVUS systems.
  • Reduced channel counts and improved imaging performance are achievable.
  • These findings pave the way for more complex and effective intravascular interventions.