Title :
A CMOS detector readout front-end for X-ray digital radiography systems
Author :
Adachi, Susumu ; Tokuda, Satoshi ; Ishida, Shinichiro
Author_Institution :
Central Res. Lab., Shimadzu Corp., Kyoto, Japan
fDate :
2/1/1996 12:00:00 AM
Abstract :
Described is a 32-channel CMOS readout front-end for X-ray pixel detectors. This front-end is intended for use in digital radiography systems that employ photon counting methods. In many photon counting systems, counting losses become problematic at higher counting rates. To minimize counting losses and ensure true counts at high rates, a synchronous charge sampling method with analog pipelining has been developed and integrated in standard 3-μm CMOS technology. The device operates with a single 5-V power supply and dissipates 4 mW/channel. The equivalent noise charge measured was less than 400 electrons at a counting rate of 8.3 Mcps (with no detector capacitance)
Keywords :
CMOS analogue integrated circuits; X-ray detection; biomedical electronics; biomedical equipment; comparators (circuits); computerised tomography; counting circuits; detector circuits; diagnostic radiography; digital readout; image sampling; medical image processing; nuclear electronics; photon counting; pipeline processing; preamplifiers; pulse height analysers; signal detection; 3 micron; 5 V; CMOS detector readout front-end; X-ray digital radiography systems; X-ray pixel detectors; analog pipelining; circuit sequencing schedule; comparator; conversion gain; counting losses; equivalent noise charge; photon counting; preamplifier; sampling amplifier; synchronous charge sampling method; true counts at high rates; CMOS technology; Capacitance measurement; Current measurement; Pipeline processing; Power supplies; Radiography; Sampling methods; Standards development; X-ray detection; X-ray detectors;
Journal_Title :
Nuclear Science, IEEE Transactions on
