On C-arm CT imaging with the extended line-ellipse-line trajectory
| Autor: | Guo Z, Andreas Maier, Guenter Lauritsch, Florian Vogt, Patrick Kugler, Frédéric Noo, Islam M |
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| Rok vydání: | 2019 |
| Předmět: |
business.industry
Computer science Detector Volume (computing) Ellipse 01 natural sciences Imaging phantom 030218 nuclear medicine & medical imaging 010101 applied mathematics 03 medical and health sciences 0302 clinical medicine Data acquisition Feature (computer vision) Line (geometry) Trajectory Computer vision Artificial intelligence 0101 mathematics business |
| Zdroj: | 2019 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC). |
| Popis: | Cone-beam (CB) imaging in interventional radiology, which we refer to as C-arm CT, is a valuable tool that could use further improvements to support growing clinical needs. Typically, a circular short-scan is used for data acquisition, which leads to unavoidable CB artifacts and limits the axial coverage to that defined by the axial extent of the detector. For robotic C-arm systems, it may be possible to overcome these two limitations using alternative data acquisition geometries. Based on previous work by our group and others, the extended line-ellipse-line (LEL) trajectory is emerging as an attractive candidate for this purpose. This trajectory is suitable to achieve efficient reconstruction with no CB artifacts, as well as to image any desired volume length in the axial direction. This second feature can be used to better cover long anatomical sites, such as the aorta or the spine; or to allow imaging with less scatter without sacrificing axial coverage, through axial beam collimation. Recently, we showed that the extended LEL trajectory can be implemented on a state-of-the-art robotic C-arm system with good geometrical fidelity and reproducibility. Here, we investigate the performance of this first implementation in terms of CB artifacts relative to the use of a circular short-scan. For this purpose, we compare iterative reconstructions of an anthropomorphic head phantom. Our results are encouraging in that they show the expected elimination of CB artifacts as well as the increase in axial coverage. |
| Databáze: | OpenAIRE |
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