Tomosynthesis implementation with adaptive online calibration on clinical C-arm systems
| Autor: | Frank G. Zöllner, Lothar R. Schad, Khanlian Chung |
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| Rok vydání: | 2018 |
| Předmět: |
Cone beam computed tomography
Computer science Biomedical Engineering Health Informatics 01 natural sciences Imaging phantom 030218 nuclear medicine & medical imaging 010309 optics 03 medical and health sciences 0302 clinical medicine Imaging Three-Dimensional Robustness (computer science) Position (vector) 0103 physical sciences Calibration Humans Radiology Nuclear Medicine and imaging Computer vision business.industry Phantoms Imaging Isocenter General Medicine Cone-Beam Computed Tomography Computer Graphics and Computer-Aided Design Tomosynthesis Computer Science Applications Trajectory Surgery Computer Vision and Pattern Recognition Artificial intelligence business Artifacts Algorithms |
| Zdroj: | International journal of computer assisted radiology and surgery. 13(10) |
| ISSN: | 1861-6429 |
| Popis: | Cone beam computed tomography (CBCT) systems offer physicians crucial 3D and 2D imaging capabilities during interventions. However, certain medical applications only require very specific information from the CBCTs (e.g., determination of the position of high-contrast objects). In diagnostics, tomosynthesis techniques can be used in these cases to minimize dose exposure. Therefore, integrating such techniques on CBCT systems could also be beneficial for interventions. In this paper, we investigate the performance of our implementation of circular tomosynthesis on a CBCT device.The tomosynthesis scan trajectory is realized with step-and-shoot on a clinical C-arm device. The online calibration algorithm uses conventionally acquired 3D CBCT of the scanned object as prior knowledge to correct the imaging geometries. The online calibration algorithm was compared to an offline calibration to test its performance. A ball bearing phantom was used to evaluate the reconstructions with respect to geometric distortions. The evaluation was done for three different scenarios to test the robustness of our tomosynthesis implementation against object deviations (e.g., pen) and different object positioning.The circular tomosynthesis was tested on a ball bearing and an anthropomorphic phantom. The results show that the calibration is robust against isocenter shifts and object deviations in the CBCT. All reconstructions used 100 projections and displayed limited angle artifacts. The accuracy of the positions and shapes of high-contrast objects were, however, determined precisely. (The maximal center position deviation is 0.31 mm.) CONCLUSION: For medical procedures that primarily determine the precise position of high-contrast objects, circular tomosynthesis could offer an approach to reduce dose exposure. |
| Databáze: | OpenAIRE |
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