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Related Concept Videos

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...
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...
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...
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...
Imaging Studies II: Positron Emission Tomography and Scintigraphy01:25

Imaging Studies II: Positron Emission Tomography and Scintigraphy

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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Updated: Jul 7, 2026

Multi-Tracer Studies of Brain Oxygen and Glucose Metabolism Using a Time-of-Flight Positron Emission Tomography-Computed Tomography Scanner
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Three-dimensional simulation of time-coded emission tomography.

J W Van Giessen, M A Viergever

    IEEE Transactions on Medical Imaging
    |January 1, 1984
    PubMed
    Summary
    This summary is machine-generated.

    Time-coded single photon imaging shows promise for thyroid tomography. Simulations confirm good image quality and fast reconstruction times for clinical diagnostic use.

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    Area of Science:

    • Medical Imaging
    • Nuclear Medicine
    • Photonics

    Background:

    • Thyroid tomography requires high-resolution imaging techniques.
    • Current methods may have limitations in speed or quality.

    Purpose of the Study:

    • To evaluate a time-coded single photon emissive imaging system for thyroid tomography.
    • To assess image reconstruction quality and computational speed.

    Main Methods:

    • Three-dimensional simulation studies were conducted.
    • The performance of a coded aperture device was analyzed.

    Main Results:

    • The time-coded system demonstrated good quality image reconstructions.
    • Reconstruction was found to be sufficiently fast for microcomputer implementation.

    Conclusions:

    • Time-coded emission tomography is a viable technique for diagnostic thyroid imaging.
    • This technology holds potential for clinical application.