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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.
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Imaging Studies III: Computed Tomography01:27

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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 Biological Samples with Optical Microscopy01:18

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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.
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Electron Microscope Tomography and Single-particle Reconstruction01:07

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Transmission electron microscopy (TEM) can be used to determine the 3D structure of biological samples with the help of techniques such as electron microscope tomography and single-particle reconstruction. While single-particle reconstruction can examine macromolecules and macromolecular complexes in vitro conditions only, tomography permits the study of cell components or small cells in vivo.
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Related Experiment Video

Updated: Apr 8, 2026

Lensfree On-chip Tomographic Microscopy Employing Multi-angle Illumination and Pixel Super-resolution
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109  MHz optical tomography using temporal magnification.

Bowen Li, Chi Zhang, Jiqiang Kang

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    |July 1, 2015
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    Summary
    This summary is machine-generated.

    This study demonstrates ultrafast optical tomographic imaging using temporal magnification. The novel system achieves a high A-scan rate, enabling rapid 3D imaging for biological samples.

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    Area of Science:

    • Optics and Photonics
    • Biomedical Imaging
    • Nonlinear Optics

    Background:

    • Traditional optical tomographic imaging methods often face limitations in speed and resolution.
    • Achieving high-speed 3D imaging is crucial for dynamic biological processes.

    Purpose of the Study:

    • To develop an ultrafast optical tomographic imaging system with a high A-scan rate.
    • To demonstrate the feasibility of temporal magnification for enhanced imaging capabilities.
    • To provide a platform for video-rate 3D tomographic imaging.

    Main Methods:

    • Implementation of a temporal imaging system utilizing two four-wave mixing (FWM) time lenses.
    • Employing carefully designed group delay dispersion for temporal magnification (48.3×).
    • Achieving a high A-scan rate of 109 MHz.

    Main Results:

    • Demonstrated an axial resolution of 140 μm in air (∼105 μm in biosample) over a 28 mm depth range.
    • Achieved a sensitivity of up to 55 dB.
    • Evaluated imaging performance using a fish-eye lens at the high A-scan rate.

    Conclusions:

    • The developed two time-lens scheme facilitates tomographic imaging and relaxes pump source requirements.
    • The system shows promise for video-rate 3D tomographic imaging.
    • Future improvements with advanced nonlinear media could yield sub-5 μm resolution.