Ott R J, Flower M A, Khan O, Kalirai T, Webb S, Leach M O, McCready V R
Br J Radiol. 1983 Dec;56(672):931-7. doi: 10.1259/0007-1285-56-672-931.
Single photon emission computed tomography (SPECT) of the liver and spleen has been studied using a GE400T/STAR rotating gamma camera/computer system. We have compared section image contrast, in both phantom and patient studies, produced by 180 degrees and 360 degrees reconstructions of data from a full 360 degrees data acquisition. There is little difference in overall image quality between the two reconstruction modalities. Quantitatively, however, appropriate 180 degrees reconstructions significantly improve lesion contrast in both organs by as much as a factor of two. In all cases studied, the values of image contrast achieved when the 180 degrees arc of reconstruction was centred about the region of interest were higher than the values obtained from the 360 degrees reconstructions. These results are shown to be independent of the corrections made for photon attenuation. Clinically this technique may prove useful in clarifying the presence or absence of disease, particularly in equivocal cases where lesions have poor contrast or are small in size. An extended clinical trial of the technique is now in progress.
利用GE400T/STAR旋转伽马相机/计算机系统对肝脏和脾脏进行了单光子发射计算机断层扫描（SPECT）研究。在体模和患者研究中，我们比较了通过对全360度数据采集得到的数据进行180度和360度重建所产生的断层图像对比度。两种重建方式的整体图像质量差异不大。然而，从定量角度来看，适当的180度重建可使两个器官中的病变对比度显著提高多达两倍。在所研究的所有病例中，当180度重建弧以感兴趣区域为中心时所获得的图像对比度值高于从360度重建中获得的值。结果表明，这些结果与针对光子衰减所做的校正无关。在临床上，该技术可能有助于明确疾病的存在与否，特别是在病变对比度差或尺寸较小的疑难病例中。目前正在对该技术进行扩展的临床试验。
