Conference · 2001

A High-Speed Image Acquisition System Based on State Machine and Fast ADCs

Herman P. Lima Jr, Ademarlaudo F. Barbosa, Germano P. Guedes, Paulo C. M. A. Farias, Luciano Manhães de Andrade Filho

IEEE Nuclear Science Symposium and Medical Imaging Conference.

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Abstract

Abstract—This work presents the development of a digital system for image acquisition capable of processing two electrical signals with amplitudes ranging from 0 to 10 V. The system correlates both signals to generate a two-dimensional histogram, where the X and Y coordinates of each event are derived from the amplitudes of the two coincident signals. The hardware consists of two analog-to-digital converters (ADCs), control electronics, and a 1M static random access memory (SRAM), implemented on a card that can be connected to a personal computer via an ISA bus. The system achieves a data acquisition rate of up to 1.0 × 10⁶ events per second, independent of the PC processor. The software was developed in the Delphi environment using Assembly routines. Image sizes can be configured from 128 × 128 to 1024 × 1024 pixels and may be visualized using three-dimensional graphics. Experimental results demonstrate the applicability of the system to two-dimensional position-sensitive X-ray detectors.