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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...
X-ray Imaging01:24

X-ray Imaging

German physicist Wilhelm Röntgen (1845–1923) was experimenting with electrical current when he discovered that a mysterious and invisible "ray" would pass through his flesh but leave an outline of his bones on a screen coated with a metal compound. In 1895, Röntgen made the first durable record of the internal parts of a living human: an "X-ray" image (as it came to be called) of his wife’s hand. Scientists worldwide quickly began their own experiments with X-rays, and by 1900, X-ray was widely...
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...
Positron Emission Tomography01:29

Positron Emission Tomography

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 being...

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Reliability of Artificial Intelligence-Based Cone Beam Computed Tomography Integration with Digital Dental Images
05:49

Reliability of Artificial Intelligence-Based Cone Beam Computed Tomography Integration with Digital Dental Images

Published on: February 23, 2024

Cone-beam tomography with a digital camera.

D L Marks, R Stack, A J Johnson

    Applied Optics
    |March 22, 2008
    PubMed
    Summary
    This summary is machine-generated.

    Computer tomography algorithms can reconstruct visible light sources, but diffraction and opacity introduce challenges. Opacity blurs reconstructions for convex objects and causes nonlinearities for concave objects.

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    Three-Dimensional Cephalometric Landmark Annotation Demonstration on Human Cone Beam Computed Tomography Scans

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    Area of Science:

    • Optics
    • Computer Vision
    • Image Reconstruction

    Background:

    • X-ray computer tomography (CT) is a well-established 3D reconstruction technique.
    • Adapting CT algorithms for visible light sources presents unique challenges due to optical phenomena.

    Purpose of the Study:

    • To investigate the applicability of x-ray CT algorithms to 3D reconstruction of visible light sources.
    • To analyze the effects of diffraction and opacity on visible light tomography.
    • To derive a blur function for Lambertian sources and present experimental results.

    Main Methods:

    • Applying x-ray CT algorithms with minimal modifications to visible light reconstruction.
    • Analyzing the impact of diffraction and opacity on convex and concave objects.
    • Deriving a blur function for Lambertian sources.
    • Conducting experimental cone-beam reconstruction of opaque objects.

    Main Results:

    • Diffraction and opacity significantly affect visible light systems compared to x-ray systems.
    • Opacity causes blurring in convex objects and nonlinearities in concave objects.
    • A blur function for Lambertian sources was derived, and experimental validation was performed.

    Conclusions:

    • X-ray CT algorithms can be adapted for visible light 3D reconstruction with considerations for optical effects.
    • Understanding opacity's impact is crucial for accurate reconstruction of visible sources.
    • The derived blur function and experimental results support the feasibility of optical tomography.