论文信息 - In application specific integrated circuit and data acquisition system for digital X-ray imaging

In application specific integrated circuit and data acquisition system for digital X-ray imaging

Abstract We have developed an Application Specific Integrated Circuit (ASIC) and data acquisition system for digital X-ray imaging. The chip consists of 16 parallel channels, each containing preamplifier, shaper, comparator and a 16 bit counter. We have demonstrated noiseless single-photon counting over a threshold of 7.2 keV using Silicon detectors and are presently capable of maximum counting rates of 2 MHz per channel. The ASIC is controlled by a personal computer through a commercial PCI card, which is also used for data acquisition. The content of the 16 bit counters are loaded into a shift register and transferred to the PC at any time at a rate of 20 MHz. The system is non-complicated, low cost and high performance and is optimised for digital X-ray imaging applications.

[1] E. Beuville,et al. High resolution X-ray imaging using a silicon strip detector , 1997 .

[2] S. Webb. The Physics of Medical Imaging , 1990 .

[3] J. Kaplon,et al. CASTOR a VLSI CMOS mixed analog—digital circuit for low noise multichannel counting applications , 1996 .

[4] B. Turko,et al. A 2D smart pixel detector for time resolved protein crystallography , 1995 .

[5] Thomas Earnest,et al. Two-dimensional pixel array image sensor for protein crystallography , 1996, Optics & Photonics.

[6] Bruce H. Hasegawa,et al. The Physics of Medical X-Ray Imaging , 1987 .

[7] An efficient digital X-ray imaging system with high spatial resolution and robust energy sensitivity , 1995, 1995 IEEE Nuclear Science Symposium and Medical Imaging Conference Record.