Tan P, Bailey D L, Meikle S R, Eberl S, Fulton R R, Hutton B F
Department of Nuclear Medicine, Royal Prince Alfred Hospital, Camperdown NSW, Australia.
J Nucl Med. 1993 Oct;34(10):1752-60.
A scanning collimated line source for simultaneously acquiring emission and transmission data from a gamma camera has been developed. The line source is microprocessor-controlled and incorporates hardware to electronically window the spatial gamma camera signals in order to separate the emission signals of the subject from transmission signals from the line source. The device improves upon the previously described emission-transmission scanning technique using a flood source in three ways: (1) it overcomes the limitation that the transmission radionuclide must have a lower energy than the emission radionuclide; (2) it provides narrow-beam (scatter free) attenuation measurements of the subject being examined; and (3) it reduces the radiation exposure to staff. Attenuation coefficients for an elliptocal water-filled phantom were measured to be mu = 0.15 +/- 0.01 cm-1. The technique has been validated in phantom and human studies using a range of radionuclide combinations and imaging geometries and gives equivalent results using separate and simultaneous acquisitions.
已开发出一种用于同时从伽马相机获取发射和透射数据的扫描准直线源。该线源由微处理器控制，并集成了硬件，可对空间伽马相机信号进行电子窗控，以便将受检对象的发射信号与来自线源的透射信号分离。该设备在使用泛源的先前描述的发射 - 透射扫描技术基础上有三方面改进：（1）克服了透射放射性核素能量必须低于发射放射性核素的限制；（2）提供了被检查对象的窄束（无散射）衰减测量；（3）减少了对工作人员的辐射暴露。测量得到椭圆形充水体模的衰减系数为μ = 0.15±0.01 cm⁻¹。该技术已在体模和人体研究中使用一系列放射性核素组合和成像几何结构进行了验证，并且单独采集和同时采集的结果相当。
