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Related Concept Videos

Computed Tomography01:10

Computed Tomography

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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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Imaging Biological Samples with Optical Microscopy01:18

Imaging Biological Samples with Optical Microscopy

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Optical microscopy uses optic principles to provide detailed images of samples. Antonie van Leeuwenhoek designed the first compound optical microscope in the 17th century to visualize blood cells, bacteria, and yeast cells. In 1830, Joseph Jackson Lister created an essentially modern light microscope. The 20th century saw the development of microscopes with enhanced magnification and resolution.
In optical microscopy, the specimen to be viewed is placed on a glass slide and clipped on the stage...
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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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Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

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Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
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Total Internal Reflection Fluorescence Microscopy01:05

Total Internal Reflection Fluorescence Microscopy

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Total internal reflection fluorescence microscopy or TIRF is an advanced microscopic technique used to visualize fluorophores in samples close to a solid surface with a higher refractive index, such as a glass coverslip. TIRF only allows fluorophores in proximity to the solid surface to be excited. When light from a medium with a lower refractive index (such as air) hits the glass coverslip at a critical angle, the light undergoes total internal reflection stead of passing through the glass.
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Two-Dimensional Microscopy in Microbiology01:29

Two-Dimensional Microscopy in Microbiology

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Two-dimensional (2D) microscopy encompasses a range of optical techniques that capture images within a single focal plane, offering detailed representations of microscopic structures. These techniques are essential in biological and medical research, enabling the visualization of cellular and subcellular structures with different levels of contrast and specificity.There are several major types of 2D microscopy, each with strengths and applications.Bright-Field MicroscopyBright-field microscopy...
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Updated: Nov 3, 2025

Longitudinal Morphological and Physiological Monitoring of Three-dimensional Tumor Spheroids Using Optical Coherence Tomography
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Longitudinal Morphological and Physiological Monitoring of Three-dimensional Tumor Spheroids Using Optical Coherence Tomography

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Crop Circles in Optical Coherence Tomography.

Giuseppe Femia1, David Taylor, Rohan Rajaratnam

  • 1Department of Cardiology, Liverpool Hospital, Elizabeth & Goulburn St, Liverpool NSW 2170, Australia. femia82@gmail.com.

The Journal of Invasive Cardiology
|June 5, 2021
PubMed
Summary
This summary is machine-generated.

Acute stent thrombosis occurred in a patient with idiopathic thrombocytopenia after coronary intervention. Optical coherence tomography revealed unusual "crop circle" findings, suggesting a potential diagnostic challenge.

Keywords:
cardiac imagingcrop circlesoptical coherence tomography

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Area of Science:

  • Cardiology
  • Interventional Cardiology
  • Medical Imaging

Background:

  • A 57-year-old female with idiopathic thrombocytopenia experienced myocardial infarction.
  • Percutaneous coronary intervention was performed for right coronary artery stenosis.

Observation:

  • Acute stent thrombosis was diagnosed via angiography.
  • Optical coherence tomography (OCT) was utilized for in-stent evaluation.
  • Catheter advancement was impeded within the stented segment.

Findings:

  • Unusual "crop circle"-like artifacts were observed on OCT imaging.
  • These artifacts extended proximally over several frames.
  • The findings suggest a potential imaging artifact or an unusual intraluminal phenomenon.

Implications:

  • The "crop circle" findings may represent a novel OCT artifact or pathology.
  • Further investigation is needed to understand the etiology and clinical significance.
  • This case highlights potential challenges in OCT interpretation post-intervention.