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A translation-based data acquisition method for computed tomography: theoretical analysis and simulation study.

Tobias Schön¹, Theobald Fuchs, Randolf Hanke

¹Fraunhofer Development Center for X-ray Technology (Fraunhofer EZRT), Fürth 90762, Germany. tobias.schoen@iis.fraunhofer.de

Medical Physics

|August 10, 2013

Summary

This study introduces a novel translational computed tomography (CT) method, replacing rotational movement with linear shifts for X-ray data acquisition. While achieving adequate image quality, it faces limitations in data completeness and spatial resolution compared to conventional CT.

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Area of Science:

Medical Imaging
Physics

Background:

Conventional computed tomography (CT) relies heavily on rotational data acquisition.
System or object rotation can introduce mechanical complexities and limitations.

Purpose of the Study:

To propose and theoretically evaluate a new CT data acquisition method minimizing rotational movement.
To substitute rotational motion with translational motion of the X-ray source.

Main Methods:

Utilizing magnification variations achieved by altering the distance between the X-ray focal spot and detector.
Implementing linear movements of the X-ray source relative to the object.
Performing a theoretical evaluation of the translational acquisition scheme.

Main Results:

Demonstrating the mathematical implementation of image reconstruction for the translational method.
Presenting simulation results with varying measurement parameters.
Quantitatively evaluating the resulting image quality.

Conclusions:

Translational X-ray CT can reconstruct images of adequate quality.
Image quality is impacted by reduced data compared to 180° acquisition.
Spatial resolution and artifacts are position-dependent due to irregular Radon space sampling.