Title :
Dark signal consideration in spatial resolution for scintillator coupled CMOS sensor
Author :
Kim, Kwang Hyun ; Kim, Yong-Kyun ; Lee, Seung Jin ; Cho, Gyuseong ; Kim, Young Soo ; Chae, Jeon Sung
Author_Institution :
Korea Atomic Energy Res. Inst., South Korea
Abstract :
The spatial resolution of scintillator coupled CMOS sensor has been investigated for the conditions of the digital radiography by using unified MTF. The scintillator was FOP CsI with high resolution and the CMOS sensor has a pixel pitch of 48 mum. The effects of initial dark signal of the sensor on the unified MTF were newly modeled considering different radiography conditions. This model showed well the contribution of the dark signal on the degradation of the spatial resolution, and it compared to the measured spatial resolution.
Keywords :
CMOS integrated circuits; radiography; semiconductor counters; solid scintillation detectors; 48 mum; FOP CsI; dark signal; digital radiography; pixel pitch; scintillator coupled CMOS sensor; spatial resolution; unified modulation transfer function; Image resolution; Radiography; Semiconductor device modeling; Sensor arrays; Sensor systems; Signal resolution; Solid scintillation detectors; Spatial resolution; Telephony; Transfer functions;
Conference_Titel :
Nuclear Science Symposium Conference Record, 2004 IEEE
Conference_Location :
Rome
Print_ISBN :
0-7803-8700-7
Electronic_ISBN :
1082-3654
DOI :
10.1109/NSSMIC.2004.1462555
