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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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Accelerated gradient restarted FISTA-TV algorithm for 3D terahertz transmission tomography.

Cong Liu, Wei Chen, Haiqing Liu

|March 17, 2026

Summary

A new terahertz computed tomography (THz-CT) system uses a fast iterative shrinkage-thresholding algorithm with total variation regularization (FISTA-TV) for improved imaging. This method enhances reconstruction quality, reduces artifacts, and preserves details in non-destructive inspection.

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Area of Science:

Physics
Engineering
Materials Science

Background:

Terahertz computed tomography (THz-CT) is a valuable non-destructive technique for analyzing complex sample structures.
Existing THz-CT methods face challenges in reconstruction quality, especially with limited projection data.

Purpose of the Study:

To develop an advanced THz-CT system and a novel algorithm for enhanced imaging.
To improve the quality of THz-CT reconstructions under sparse projection conditions.

Main Methods:

A 2.5 THz continuous-wave THz-CT system was built, incorporating a quantum cascade laser and a high-speed focal plane array detector.
A fast iterative shrinkage-thresholding algorithm with total variation regularization (FISTA-TV) was proposed and implemented.

Main Results:

FISTA-TV significantly outperformed conventional methods in suppressing noise and streak artifacts.
The algorithm effectively preserved edge sharpness and internal structural details.
Quantitative metrics (Laplacian variance, mean gradient magnitude, entropy) confirmed enhanced sharpness and reduced noise.

Conclusions:

FISTA-TV is a feasible algorithm for high-quality THz-CT imaging, particularly under limited-angle conditions.
The developed THz-CT system and FISTA-TV show potential for non-destructive inspection of polymers and pharmaceuticals.