다층구조 엑스선 검출기를 이용한 이중에너지 조영제 영상의 물질 구분에 관한 연구
A Study on the Material Decomposition of Dual-Energy Iodine Image by Using the Multilayer X-ray Detector
2
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
Dual-energy X-ray imaging (DEI) techniques can provide X-ray images that a certain material is suppressed or emphasized by combining two X-ray images obtained from two different x-ray spectrum. In this paper, a single-shot DEI, which uses stacked two detectors (i.e., multilayer detector), is proposed to reduce the patient dose and increase throughput in angiography. The polymethyl methacrylate (PMMA) and aluminum (Al) were selected as two basis materials for material decomposition, and material-specific images are reconstructed as a vector combination of these two materials. We investigate the contrast and noise performance of material-decomposed images using iodine phantoms with various concentrations and diameters. The single-shot DEI shows comparable performances to the conventional dual-shot DEI. In particular, the single-shot DEI shows edge enhancement in material-decomposed images due to the different spatial-resolution characteristics of upper and lower detectors. This study could be useful for designing the multilayer detector including scintillators and energy-separation filter for angiography purposes.
Abstract
Dual-energy X-ray imaging (DEI) techniques can provide X-ray images that a certain material is suppressed or emphasized by combining two X-ray images obtained from two different x-ray spectrum. In this paper, a single-shot DEI, which uses stacked two detectors (i.e., multilayer detector), is proposed to reduce the patient dose and increase throughput in angiography. The polymethyl methacrylate (PMMA) and aluminum (Al) were selected as two basis materials for material decomposition, and material-specific images are reconstructed as a vector combination of these two materials. We investigate the contrast and noise performance of material-decomposed images using iodine phantoms with various concentrations and diameters. The single-shot DEI shows comparable performances to the conventional dual-shot DEI. In particular, the single-shot DEI shows edge enhancement in material-decomposed images due to the different spatial-resolution characteristics of upper and lower detectors. This study could be useful for designing the multilayer detector including scintillators and energy-separation filter for angiography purposes.
참고문헌 (21)
- Levin DC, "Digital subtraction angiography : Principles and pitfalls of image improvement techniques", American Journal of Roentgenology, 143(3), pp.447~454 (1984)
- Meijering EH, "Image registration for digital subtraction angiography", Int J Comput Vision, 31(2), pp.227~246 (1999)
- Mistretta CA, "Absorption edge fluoroscopy using quasi-monoenergetic x-ray beams", Invest Radiol, 8(6), pp.402~412 (1973)
- Kelcz F, "Absorption-edge fluoroscopy using a three spectrum technique", Med. Phys, 3(3), pp.159~168 (1976)
- Alvarez RE, "Energy-selective reconstructions in x-ray computerized tomography", Phys Med Biol, 21(5), pp.733~744 (1976)
- Riederer SJ, "Selective iodine imaging using K-edge energies in computerized x-ray tomography", Med Phys, 4(6), pp.474~481 (1977)
- Kruger RA, "Relative properties of tomography, K-edge imaging, and K-edge tomography", Med Phys, 4(3), pp.244~249 (1977)
- Houk TL, "Real-time digital K-edge subtraction fluoroscopy", Invest Radiol, 14(4), pp.270~278 (1979)
- McCollough CH, "A correlated noise reduction algorithm for dual-energy digital subtraction angiography", Med Phys, 16(6), pp.873~880 (1989)
- Molloi SY, "Quantitative dual-energy coronary arteriography", Invest Radiol, 25(8), pp.908~914 (1990)
- Van Lysel MS, "Left ventricular dual-energy digital subtraction angiography : A motion immune digital subtraction technique", Int J Card Imaging, 7(1), pp.55~65 (1991)
- Van Lysel MS, "Optimization of beam parameters for dual-energy digital subtraction angiography", Med Phys, 21(2), pp.219~226 (1994)
- Guthaner DF, "Clinical application of hybrid subtraction digital angiography : Preliminary results", Cardiovas Intervention Radiol, 6(4), pp.290~294 (1983)
- Molloi SY, "Quantification techniques for dual-energy cardiac imaging", Med Phys, 16(2), pp.209~217 (1989)
- 박형신, "중재적방사선검사에서 환자 피폭선량에 관한 연구", 방사선기술과학, 35(4), pp.299~308 (2012), 대한방사선과학회
- 이승열, "TACE의 중재적 시술시 환자의 피폭선량 평가", 방사선기술과학, 34(3), pp.209~214 (2011), 대한방사선과학회
- Punnoose J, "Technical Note: Spektr 3.0-A computational tool for x-ray spectrum", Med Phys, 43(8), pp.4711~4717 (2013)
- Richard S, "Cascaded systems analysis of boise reduction algorithms in dual-energy imaging", Med Phys, 35(2), pp.586~601 (2008)
- Kim J, "Linear modeling of single-shot dual-energy x-ray imaging using a sandwich detector", Journal of Instrumentation, 12(1), pp.C01029~ (2017)
- Kim J, "Development of a large-area multilayer detector for single-shot dual-energy imaging", Journal of Instrumentation, 13(12), pp.C12018~ (2018)
- Gonzalez RC, "Digital Image Processing" (2002), Prentice-Hall Inc.