Zobrazeno 1 - 10
of 13
pro vyhledávání: '"Jong Chul Han"'
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 847:104-110
The imaging properties of a complementary metal-oxide-semiconductor (CMOS) active-pixel photodiode array coupled to a thin gadolinium-based granular phosphor screen with a fiber-optic faceplate are investigated. It is shown that this system has a non
Characterization of on-site digital mammography systems: Direct versus indirect conversion detectors
Publikováno v:
Journal of the Korean Physical Society. 66:1926-1935
We investigated the performances of two digital mammography systems. The systems use a cesium-iodide (CsI) scintillator and an amorphous selenium (a-Se) photoconductor for X-ray detection and are installed in the same hospital. As physical metrics, w
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 760:79-85
Recently, photon-counting detectors capable of resolving incident x-ray photon energies have been considered for use in spectral x-ray imaging applications. For reliable use of energy-resolved photon-counting detectors (ERPCDs), energy calibration is
Autor:
Hanbean Youn, Seungryong Cho, Soohwa Kam, Ho Kyung Kim, Jong Chul Han, Seungman Yun, Thorsten Graeve Achterkirchen
Publikováno v:
Journal of the Korean Physical Society. 65:770-777
Active pixel design using the complementary metal-oxide-semiconductor (CMOS) process is a compelling solution for use in X-ray imaging detectors because of its excellent electronic noise characteristics. We have investigated the imaging performance o
Publikováno v:
Journal of the Korean Physical Society. 62:813-819
The development of photon-counting pixel detectors for spectral X-ray imaging is in its prime. Optimization of the pixel geometry is crucial for obtaining a reliable spectral response in each pixel element with the least distortion due to the fundame
Autor:
Min Kook Cho, Hanbean Youn, Jong Hyo Kim, Jesse Tanguay, Ian A. Cunningham, Jong Chul Han, Ho Kyung Kim, Sun Young Jang
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 652:810-814
Diagnosis and screening of breast cancer using digital mammography, breast tomosynthesis and cone-beam computed tomography are among the most active areas of research in diagnostic radiology. For a better design of imaging systems and the optimizatio
Autor:
Seungman Yun, Chang Hwy Lim, Ian A. Cunningham, Mike McDonald, Thorsten Graeve Achterkirchen, Ho Kyung Kim, Michael G. Farrier, Jong Chul Han
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 652:500-503
We report the imaging characteristics of the recently developed large-area complementary metal-oxide-semiconductor (CMOS) active-pixel detector for low-energy digital X-ray imaging applications. The detector consists of a scintillator to convert X-ra
Signal and noise analysis of flat-panel sandwich detectors for single-shot dual-energy x-ray imaging
Autor:
Dong Woon Kim, Junwoo Kim, Jesse Tanguay, Jong Chul Han, Ian A. Cunningham, Ho Kyung Kim, Soohwa Kam, Seungman Yun, Hanbean Youn
Publikováno v:
SPIE Proceedings.
We have developed a novel sandwich-style single-shot (single-kV) detector by stacking two indirect-conversion flat-panel detectors for preclinical mouse imaging. In the sandwich detector structure, extra noise due to the direct x-ray absorption in ph
Autor:
Dong Woon Kim, Jesse Tanguay, Ian A. Cunningham, Ho Kyung Kim, Seungman Yun, Jong Chul Han, Hanbean Youn
Publikováno v:
SPIE Proceedings.
We revisit the doubly-layered sandwich detector configuration for single-shot dual-energy x-ray imaging. In order to understand its proper operation, we investigated the contrast-to-noise performance in terms of the x-ray beam setup using the Monte C
Publikováno v:
SPIE Proceedings.
Detectors for computed tomography (CT) typically consist of scintillator and photodiode arrays which are coupled using optical glue. Therefore, the leakage of optical photons generated in a scintillator block to neighboring pixel photodiodes through