Assessment of a photon-counting detector for a dual-energy C-arm angiographic system
- 주제(키워드) C-arm , computed tomography , dual-energy , photon-counting , x-ray detectors
- 관리정보기술 faculty
- 등재 SCIE, SCOPUS
- 발행기관 John Wiley and Sons Ltd.
- 발행년도 2017
- URI http://www.dcollection.net/handler/ewha/000000149954
- 본문언어 영어
- Published As http://dx.doi.org/10.1002/mp.12517
초록/요약
Purpose: This article presents the implementation and assessment of photon-counting dual-energy x-ray detector technology for angiographic C-arm systems in interventional radiology. Methods: A photon-counting detector was successfully integrated into a clinical C-arm CT system. Detector performance was assessed using image uniformity metrics in both 2D projections and 3D cone-beam computed tomography (CBCT) images. Uniform exposure fields were acquired to analyze projection images and scans of a homogeneous cylinder phantom were taken to analyze 3D reconstructions. Image uniformity was assessed over a broad range of imaging parameters. Results: Detector calibration greatly improved image uniformity, reducing image variation from 8.8% to 0.5% in an ideal scenario, but image uniformity degraded when imaging parameters varied strongly from values set at calibration: the tube voltage, low-high energy threshhold, and tube current had the greatest impact. Material discrimination and dynamic angiography capabilities were successfully demonstrated in separate phantom and in vivo experiments. Conclusion: The uniformity results identified major factors degrading image quality. The quantitative results will guide selection of calibration points to mitigate the loss of uniformity. The unique combination of dual-energy and fluoroscopy imaging capabilities with a flat-panel photon-counting detector may enable new applications in interventional radiology. © 2017 American Association of Physicists in Medicine.
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