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Computed Tomography

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...

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Related Experiment Video

Updated: Mar 16, 2026

X-ray Dose Reduction through Adaptive Exposure in Fluoroscopic Imaging

X-ray Dose Reduction through Adaptive Exposure in Fluoroscopic Imaging

Published on: September 11, 2011

Multisource inverse-geometry CT. Part II. X-ray source design and prototype.

V Bogdan Neculaes¹, Antonio Caiafa¹, Yang Cao¹

¹GE Global Research, Niskayuna, New York 12309.

Medical Physics

|August 5, 2016

Summary

This summary is machine-generated.

A novel high-power distributed x-ray source, or multisource, was developed for inverse-geometry computed tomography (CT). This modular system successfully integrated 32 sources, enabling precise beam control and high performance for advanced CT applications.

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Neutron Radiography and Computed Tomography of Biological Systems at the Oak Ridge National Laboratory's High Flux Isotope Reactor

Neutron Radiography and Computed Tomography of Biological Systems at the Oak Ridge National Laboratory's High Flux Isotope Reactor

Published on: May 7, 2021

Area of Science:

Medical Physics and Imaging Technology
X-ray Source Development
Computed Tomography (CT)

Background:

Inverse-geometry computed tomography (CT) requires specialized x-ray sources.
Development of high-power, controllable x-ray sources is crucial for advancing CT capabilities.
Existing systems may have limitations in flux, control, and spatial resolution.

Purpose of the Study:

To summarize the development of a high-power distributed x-ray source (multisource) for inverse-geometry CT.
To detail the evolution of the source architecture, component design, and experimental validation.
To present the integration and operation of a modular multisource system.

Main Methods:

Utilized dispenser cathode emitters as electron sources in a modular design.
Employed tungsten targets brazed onto copper anode blocks within each module.
Implemented a matrix topology with low-noise electronic controls for emitter switching and a specialized ceramic connector for high voltage standoff and cooling.

Main Results:

Successfully integrated and operated four modules (32 x-ray sources) on an inverse-geometry CT system.
Achieved high beam current (>1000 mA) with small focal spot size (0.5 × 1.4 mm) using electrostatic lenses.
Demonstrated precise beam current modulation (virtual bowtie filter) and rapid switching (<1 μs) at up to 120 kV.

Conclusions:

A high-power, distributed x-ray source for inverse-geometry CT was successfully designed, fabricated, and operated.
The modular design and advanced controls provide significant capabilities for CT applications.
Future enhancements may involve increasing the number of sources and utilizing faster detectors to further boost x-ray flux.