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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 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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When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
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Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

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Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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Radiological Investigation II: MRI and Ventilation Perfusion Scan01:30

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Magnetic Resonance Imaging (MRI) and Ventilation Perfusion Scans are two radiological investigations that offer detailed diagnostic images of the body, particularly lung structures.
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Thinned-skull Cortical Window Technique for In Vivo Optical Coherence Tomography Imaging
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Short-wave infrared computed tomography.

Zhengxin Wang, Tong Yang, Quhan Cheng

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    Summary
    This summary is machine-generated.

    We developed a safe, low-power short-wave infrared computed tomography system for nondestructive testing. This method achieves 10µm resolution, enabling imaging of materials opaque to visible light, such as plastics and biological tissues.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Biomedical Imaging

    Background:

    • Visible light imaging is limited for certain materials like plastics and biological tissues.
    • Nondestructive testing (NDT) methods are crucial for material analysis and quality control.
    • Computed tomography (CT) offers 3D imaging capabilities but requires suitable illumination and detection.

    Purpose of the Study:

    • To develop and demonstrate a short-wave infrared computed tomography (SWIR-CT) method.
    • To enable high-speed, safe, and low-power NDT for materials invisible to visible light.
    • To achieve high-resolution 3D reconstruction of complex structures.

    Main Methods:

    • Utilized a fiber-coupled 1.44µm super-luminescent diode as the light source.
    • Employed a lead selenide (PbSe) photodiode as the infrared detector.
    • Implemented an electronically controlled rotation and translation stage for high-speed Radon scanning.

    Main Results:

    • Successfully built a SWIR-CT system capable of tomography and 3D reconstruction.
    • Demonstrated imaging of black plastic bottles and artificial blood vessels.
    • Achieved a measured resolution of 10µm.

    Conclusions:

    • The developed SWIR-CT method is a safe and effective NDT technique.
    • This technology can image materials opaque to visible light, expanding NDT applications.
    • The system's high resolution and speed make it suitable for various scientific and industrial uses.