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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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Positron Emission Tomography01:29

Positron Emission Tomography

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Positron emission tomography (PET) is a medical imaging technique involving radiopharmaceuticals — substances that emit short-lived radiation. Although the first PET scanner was introduced in 1961, it took 15 more years before radiopharmaceuticals were combined with the technique and revolutionized its potential.
One of the main requirements of a PET scan is a positron-emitting radioisotope, which is produced in a cyclotron and then attached to a substance used by the part of the body...
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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 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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Imaging Studies II: Positron Emission Tomography and Scintigraphy01:25

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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.
Fundamental Principles of PET
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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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Multi-Tracer Studies of Brain Oxygen and Glucose Metabolism Using a Time-of-Flight Positron Emission Tomography-Computed Tomography Scanner
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Phase contrast tomography (PCT).

Ying Ma, Wenjing Feng, Yunze Lei

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    |May 4, 2026
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    Summary
    This summary is machine-generated.

    We developed phase contrast tomography (PCT), a new label-free 3D imaging method. PCT reconstructs refractive index in 3D, enabling visualization of dynamic cellular processes with high resolution.

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    Area of Science:

    • Biophysics
    • Cell Biology
    • Optical Imaging

    Background:

    • Phase contrast microscopy is a key technique for 2D imaging of transparent biological specimens.
    • Existing methods lack 3D refractive index reconstruction capabilities for dynamic processes.

    Purpose of the Study:

    • To introduce phase contrast tomography (PCT), a novel label-free 3D refractive index imaging technique.
    • To demonstrate PCT's ability to visualize dynamic cellular processes in 3D.

    Main Methods:

    • Integration of quantitative phase contrast microscopy with the Fourier diffraction theorem.
    • Development of a technique for label-free 3D refractive index reconstruction.
    • Utilizing PCT for live-cell imaging and 3D single-particle tracking.

    Main Results:

    • Achieved lateral resolution of 270 nm and axial resolution of 890 nm.
    • Demonstrated a volumetric imaging rate of 3 Hz.
    • Captured mitochondrial cyclization and tracked lipid droplets in live COS7 cells, revealing diffusion dynamics.

    Conclusions:

    • PCT offers a powerful platform for label-free 3D imaging of dynamic biological processes.
    • The technique extends the benefits of 2D phase contrast imaging to 3D refractive index reconstruction.
    • PCT provides new insights into intracellular dynamics, unaffected by external factors like gravity.