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Angular oversampling with temporally offset layers on multilayer detectors in computed tomography.

Martin Sjölin¹, Mats Danielsson¹

¹Department of Physics, Section for Medical Imaging, Royal Institute of Technology, AlbaNova University Center, SE-106 91 Stockholm, Sweden.

Medical Physics

|June 10, 2016

Summary

This study introduces a simple method to increase angular sampling in computed tomography (CT) using multilayer detectors. The technique effectively reduces aliasing artifacts in medical imaging.

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Area of Science:

Medical Imaging
Radiological Physics

Background:

High-speed computed tomography (CT) scanners necessitate faster rotation speeds, leading to reduced angular sampling.
Lower angular sampling rates increase the risk of motion artifacts and aliasing in dynamic imaging applications like perfusion and cardiac scans.

Purpose of the Study:

To present a straightforward method for achieving angular oversampling in continuous rotation CT systems utilizing multilayer detectors.
To enhance image quality by mitigating aliasing artifacts inherent in high-speed CT acquisition.

Main Methods:

Temporal offsets were introduced between measurement periods of different detector layers.
This temporal staggering effectively multiplies the angular sampling rate by the number of detector layers.
A simulation using a two-layer detector was conducted to validate the proposed concept.

Main Results:

The simulation demonstrated a significant reduction in aliasing artifacts caused by insufficient angular sampling.
The method decreased the strength of aliasing artifacts by approximately one order of magnitude for a simulated point source blurred by a 2D Gaussian kernel.

Conclusions:

The proposed oversampling method is readily implementable in current multilayer CT detector systems.
This technique offers a practical solution for reducing aliasing artifacts in reconstructed CT images, improving diagnostic accuracy.