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Related Concept Videos

Computed Tomography01:10

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...
Electron Microscope Tomography and Single-particle Reconstruction01:07

Electron Microscope Tomography and Single-particle Reconstruction

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.
Electron Tomography
Electron tomography can be performed either in TEM or STEM (scanning transmission...
Two-Dimensional Microscopy in Microbiology01:29

Two-Dimensional Microscopy in Microbiology

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...
Three-Dimensional Microscopy in Microbiology01:28

Three-Dimensional Microscopy in Microbiology

Three-dimensional imaging techniques are essential in cell biology, allowing researchers to visualize intricate cellular structures with high resolution. Two prominent methods, Differential Interference Contrast Microscopy (DIC) and Confocal Scanning Laser Microscopy (CSLM), provide distinct advantages for imaging live and thick specimens, respectively.Differential Interference Contrast MicroscopyDIC microscopy enhances contrast in transparent, unstained samples by converting phase...
Imaging Studies I: CT and MRI01:14

Imaging Studies I: CT and MRI

Introduction: MRI and CT scans are crucial advancements in medical imaging techniques, playing a vital role in diagnosing conditions related to the gastrointestinal (GI) system. Each scan serves distinct purposes, targets specific areas, and requires unique nursing duties.
Description of the Procedures
Computed Tomography (CT) scan:
Computed Tomography (CT) scans use X-ray technology to generate detailed images of bones, organs, and tissues. During the scan, the patient lies on a moving table...

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Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
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Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating

Published on: October 11, 2016

Two-dimensional grating interferometric imaging by computed tomography.

Y S Cheng

    Optics Letters
    |September 10, 2009
    PubMed
    Summary
    This summary is machine-generated.

    Lensless interferometric imaging of 2D objects is achieved using the projection slice theorem. Rotating an achromatic grating interferometer enables this advanced imaging technique.

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    Area of Science:

    • Optics and Photonics
    • Image Processing
    • Interferometry

    Background:

    • Traditional imaging techniques often require lenses, which can introduce aberrations and limitations.
    • Interferometric methods offer high-resolution imaging capabilities.
    • The projection slice theorem is a fundamental principle in computed tomography and image reconstruction.

    Purpose of the Study:

    • To demonstrate a lensless interferometric imaging method for two-dimensional objects.
    • To utilize the projection slice theorem for image reconstruction in a lensless setup.
    • To explore the application of an achromatic grating interferometer in this imaging process.

    Main Methods:

    • Employing the projection slice theorem for image reconstruction.
    • Utilizing a lensless interferometric setup with an achromatic grating interferometer.
    • Rotating the interferometer around its optical axis to acquire projection data.

    Main Results:

    • Successful lensless imaging of a two-dimensional object was achieved.
    • The experimental setup validated the application of the projection slice theorem.
    • The achromatic grating interferometer proved effective for this interferometric imaging process.

    Conclusions:

    • Lensless interferometric imaging is feasible using the projection slice theorem.
    • Rotation of an achromatic grating interferometer provides the necessary data for image reconstruction.
    • This technique offers a promising alternative for certain imaging applications where lenses are undesirable.