A translation‐based data acquisition method for computed tomography: Theoretical analysis and simulation study. Issue 8 (31st July 2013)

• Record Type: Journal Article
• Authors: Schön, Tobias; Fuchs, Theobald; Hanke, Randolf; Dremel, Kilian
• Is Part Of: Medical physics. Volume 40:Issue 8(2013)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2013-07-31
• Subjects: Computed tomography -- Spatial resolution -- Artifacts and distortion -- Reconstruction; computerised tomography -- data acquisition -- image reconstruction -- image resolution -- image sampling -- medical image processing -- X‐ray detection; x‐ray imaging computed tomography -- translational data acquisition; Computerised tomographs -- Digital computing or data processing equipment or methods, specially adapted for specific applications -- Image data processing or generation, in general; Computed tomography -- Medical imaging -- Medical image quality -- Data acquisition -- Image reconstruction -- X‐ray detectors -- Medical image reconstruction -- Position sensitive detectors -- Medical X‐ray imaging -- Image sensors; Medical physics -- Periodicals; Medical physics; Geneeskunde; Natuurkunde; Toepassingen; Biophysics; Periodicals; Periodicals; Electronic journals; 610.153
• DOI: 10.1118/1.4813896
• Languages: English
• ISSNs: 0094-2405

Abstract

Abstract : Purpose: : In this paper, the authors propose a new method for computed tomography (CT) data acquisition, which requires almost no rotational movement of the system or the object, respectively. Methods: : The new method is taking advantage of the fact that variations of magnification, e.g., by change of distance between x‐ray focal spot and detector, will provide both different beam angles and ray paths with respect to the object. In other words, the rotational movement is substituted by one or more linear movements of the x‐ray source toward the object under inspection. The authors present a theoretical evaluation of this new translational acquisition scheme. Results: : The mathematical implementation of image reconstruction are discussed and results from simulations with varying measurement parameters are shown. The image quality is evaluated by quantitative numbers. Conclusions: : Translational x‐ray CT generally allows for reconstructing images with adequate quality. However, the image quality suffers from the lack of data compared to conventional 180° acquisition methods and, due to the irregular sampling of Radon space, spatial resolution as well as artifacts depend on the position within the image.