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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.
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Tracking the Mammary Architectural Features and Detecting Breast Cancer with Magnetic Resonance Diffusion Tensor Imaging

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High resolution stationary digital breast tomosynthesis using distributed carbon nanotube x-ray source array.

Xin Qian¹, Andrew Tucker, Emily Gidcumb

¹Department of Physics and Astronomy, University of North Carolina, Chapel Hill, NC 27599, USA. xqian@physics.unc.edu

Medical Physics

|April 10, 2012

Summary

This study introduces a stationary digital breast tomosynthesis (s-DBT) system using a carbon nanotube (CNT) x-ray source array. The new system significantly enhances spatial resolution and reduces scanning time for improved breast cancer detection.

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Area of Science:

Medical Imaging
Biomedical Engineering
Materials Science

Background:

Digital breast tomosynthesis (DBT) is limited by low spatial resolution and long scanning times.
These limitations are primarily due to the mechanical motion of the rotating x-ray tube.
Advancements in x-ray source technology are crucial for improving DBT performance.

Purpose of the Study:

To investigate the feasibility of a stationary digital breast tomosynthesis (s-DBT) system.
To enhance spatial resolution and reduce scanning time by replacing the rotating x-ray tube with a carbon nanotube (CNT) x-ray source array.
To overcome the technical limitations of current DBT technology.

Main Methods:

Designed and evaluated a CNT x-ray source array with 31 individually addressable sources.
Conducted simulations for anode heat load and electron focusing optics.
Measured CNT cathode field emission current for lifetime assessment.
Integrated the CNT source array with a Hologic Selenia Dimensions scanner and developed an electronic control unit.
Evaluated the s-DBT system performance using physical phantoms.

Main Results:

The CNT x-ray source array achieved a stable operation with a 0.6 mm isotropic focal spot size.
Projection resolution increased from 4.0 cycles/mm (DBT) to 5.1 cycles/mm (s-DBT) at 10% MTF.
Scanning time for a 15-view, 100 mAs scan was 6.3 seconds, independent of angular coverage.
Accelerated lifetime testing indicated a clinical operation lifetime exceeding 3 years for the CNT source array.
Phantom studies demonstrated good quality reconstructed images.

Conclusions:

A prototype s-DBT scanner utilizing a CNT x-ray source array was successfully developed and evaluated.
The s-DBT system significantly improves spatial resolution by eliminating focal spot motion-induced blur.
Scanner speed is independent of angular coverage and can be further improved with faster detectors.
The CNT x-ray source array demonstrates long-term stability suitable for clinical use.