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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...
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
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...
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...

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Related Experiment Video

Updated: Jul 5, 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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[Ictal single photon computed tomography and SISCOM: methods and utility].

M-O Habert1, G Huberfeld

  • 1Inserm U678 Laboratoire d'imagerie fonctionnelle, université Pierre-et-Marie-Curie, Paris-6, 75013 Paris, France. habert@imed.jussieu.fr

Neuro-Chirurgie
|April 18, 2008
PubMed
Summary

Ictal single photon emission computed tomography (SPECT) reveals epileptic networks beyond the seizure focus by showing hyperperfusion. This technique offers valuable spatial data for diagnosing epilepsy, complementing other evaluations.

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Area of Science:

  • Neurology
  • Medical Imaging

Background:

  • Ictal single photon emission computed tomography (SPECT) is a neuroimaging technique used to detect hyperperfusion associated with epileptic activity during seizures.
  • While SPECT provides spatial information on ictal activity, its temporal resolution is limited, leading to the visualization of broader epileptogenic networks rather than just the seizure onset zone.

Purpose of the Study:

  • This review aims to describe the ictal SPECT technique and discuss parameters influencing ictal perfusion images.
  • To highlight the diagnostic value of SPECT in epilepsy evaluation and decision-making.

Main Methods:

  • Review of the ictal SPECT technique.
  • Analysis of parameters affecting ictal perfusion imaging.

Main Results:

  • Ictal SPECT reflects epileptic activity through hyperperfusion during seizures.
  • SPECT visualizes larger epileptogenic networks due to spatiotemporal dynamics, not just the epileptogenic zone.
  • SPECT provides original diagnostic data that complements other evaluation parameters.

Conclusions:

  • Ictal SPECT is a valuable tool for understanding the extent of epileptic networks.
  • The technique offers crucial spatial insights into ictal processes.
  • SPECT findings contribute significantly to the comprehensive evaluation of epilepsy.