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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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Using Synchrotron Radiation Microtomography to Investigate Multi-scale Three-dimensional Microelectronic Packages

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Published on: April 13, 2016

Stationary chest tomosynthesis using a carbon nanotube x-ray source array: a feasibility study.

Jing Shan¹, Andrew W Tucker, Yueh Z Lee

¹Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA.

Physics in Medicine and Biology

|December 6, 2014

Summary

Stationary chest tomosynthesis (s-DCT) using a carbon nanotube (CNT) x-ray source array is feasible. This novel system shows promise for improved lung nodule detection with clear imaging of chest structures.

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

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Published on: May 7, 2021

Area of Science:

Medical Imaging
Radiological Technology
Materials Science (Carbon Nanotubes)

Background:

Chest tomosynthesis offers improved sensitivity for detecting small lung nodules compared to 2D radiography.
Existing tomosynthesis systems often rely on mechanical motion, which can be complex and introduce artifacts.
Carbon nanotube (CNT) field emission arrays present a potential for novel X-ray source development.

Purpose of the Study:

To investigate the feasibility of stationary chest tomosynthesis (s-DCT) utilizing a spatially distributed CNT X-ray source array.
To determine the system requirements for implementing s-DCT with CNT technology.
To assess the image quality and performance of a bench-top s-DCT system.

Main Methods:

Construction of a bench-top s-DCT system using a CNT field emission source array and a flat panel detector.
Characterization of X-ray tube output, beam quality, focal spot size, and system resolution (in-plane and in-depth).
Reconstruction of tomosynthesis slices from an anthropomorphic chest phantom for image quality assessment.

Main Results:

All 75 CNT sources operated reliably, demonstrating source-to-source consistency in tube current and focal spot size.
Measured beam quality and focal spot size (2.5 x 0.5 mm) were suitable for imaging.
Improved artifact spread function (FWHM 5.2 mm) and clear visualization of pulmonary structures were achieved.

Conclusions:

The CNT X-ray source array is capable of generating sufficient dose for chest tomosynthesis.
The developed bench-top system demonstrates the feasibility of stationary chest tomosynthesis using distributed CNT X-ray sources.
This technology holds potential for advancing lung nodule detection and other thoracic imaging applications.