평판 디텍터 기반 마이크로 CT 시스템을 위한 Ring Artifact 보정 방법
A Ring Artifact Correction Method for a Flat-panel Detector Based Micro-CT System
2
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
The most troublesome artifacts in micro computed tomography (micro-CT) are ring artifacts. The ring artifacts are caused by non-uniform sensitivity and defective pixels of the x-ray detector. These ring artifacts seriously degrade the quality of CT images. In flat-panel detector based micro-CT systems, the ring artifacts are hardly removed by conventional correction methods of digital radiography, because very small difference of detector pixel signals may make severe ring artifacts. This paper presents a novel method to remove ring artifacts in flat-panel detector based micro-CT systems. First, the bad lines of a sinogram which are caused by defective pixels of the detector are identified, and then, they are corrected using a cubic spline interpolation technique. Finally, a ring artifacts free image is reconstructed from the corrected projections. We applied the method to various kinds of objects and found that the image qualities were much improved.
Abstract
The most troublesome artifacts in micro computed tomography (micro-CT) are ring artifacts. The ring artifacts are caused by non-uniform sensitivity and defective pixels of the x-ray detector. These ring artifacts seriously degrade the quality of CT images. In flat-panel detector based micro-CT systems, the ring artifacts are hardly removed by conventional correction methods of digital radiography, because very small difference of detector pixel signals may make severe ring artifacts. This paper presents a novel method to remove ring artifacts in flat-panel detector based micro-CT systems. First, the bad lines of a sinogram which are caused by defective pixels of the detector are identified, and then, they are corrected using a cubic spline interpolation technique. Finally, a ring artifacts free image is reconstructed from the corrected projections. We applied the method to various kinds of objects and found that the image qualities were much improved.
참고문헌 (11)
- 박정진, "소형 동물의 생체 촬영을 위한 고해상도 Micro-CT 시스템의 개발", 의공학회지, 28(1), pp.95~101 (2007), 대한의용생체공학회
- Myung H. Cho, "Trabecular thickness measurement in cancellous bones: postmortem rat studies with the zoom-in micro-tomography technique", Physiological Measurement, 26, pp.1~10 (2005)
- I.K. Chun, "In vivo trabecular thickness measurement in cancellous bones: longitudinal rat imaging studies", Physiological Measurement, 27, pp.695~702 (2006)
- A. Barbier, "The visualization and evaluation of bone architecture in the rat using three-dimensional X-ray microcomputed tomography", J. Bone and Min. Research, 17, pp.37~44 (1999)
- S.C. Lee, "A flat-panel detector-based micro-CT system: Performance evaluation for small-animal imaging", Phys. Med. Biol, 48, pp.4173~4185 (2003)
- S.C. Lee, "Development and characterization of a flat-panel detector based microtomography system", Key Engineering Material, 270, pp.245~251 (2004)
- H.K. Kim, "Performance evaluation of a flat-panel detector and a microtomography system for small animal imaging", IEEE Nucl. Sci, 52(1), pp.193~198 (2005)
- D.A. Jaffray, "Cone-beam computed tomography with a flat-panel imager: Initial performance characterization", Med. Phys, 27(6), pp.1311~1323 (2000)
- X. Tang, "Cone beam volume CT image artifacts caused by defective cells in x-ray flat panel imagers and the artifact removal using a wavelet-analysis-based algorithm", J. Med. Phys, 28(5), pp.812~825 (2001)
- J. Sijbers, "Reduction of ring artifacts in high resolution micro-CT reconstructions", J. Phys. Med. Biol, 49(14), pp.247~253 (2004)
- L.A. Feldkamp, "Practical cone-beam algorithm", J. Opt. Soc. Am. A, 1(6), pp.612~619 (1984)