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在现有同位素扫描机中,往往存在扫描图象层次交错和不同扣本底时影响扫描图质量等问题。本文介绍采用模-数变换和脉冲数字逻辑电路原理的打印显示,以及差动式门电路和不同取数译码扣除本底的措施,从而克服了上述通病。此外,就采用小面积闪烁探头满足灵敏度和分辨率要求,机械行车的光电控制电路和数码打印头原理,本文也都作了扼要叙述。目前国内同位素扫描机品种繁多,而其
In the existing isotope scanners, there are often problems such as the staggered scanning image levels and the quality of the scanned images when different background counts. This article describes the use of analog-digital conversion and pulse digital logic circuit printed the principle of display, as well as the differential gate and subtract the number of different decoding background measures, thus overcoming the common problem. In addition, the use of a small area scintillation probe to meet the sensitivity and resolution requirements, mechanical driving of the photoelectric control circuit and the principle of digital print head, this article also made a brief description. Currently a wide range of domestic isotope scanners, and its