Newhouse J H, Prien E L, Amis E S, Dretler S P, Pfister R C
AJR Am J Roentgenol. 1984 Mar;142(3):545-8. doi: 10.2214/ajr.142.3.545.
Excised urinary calculi were subjected to computed tomographic (CT) scanning in an attempt to determine whether CT attenuation values would allow accurate analysis of stone composition. The mean, maximum, and modal pixel densities of the calculi were recorded and compared; the resulting values reflected considerable heterogeneity in stone density. Although uric acid and cystine calculi could be identified by their discrete ranges on one or more of these criteria, calcium-containing stones of various compositions, including struvite, could not be distinguished reliably. CT analysis of stone density is not likely to be more accurate than standard radiography in characterizing stone composition in vivo.
对切除的尿结石进行计算机断层扫描（CT），以确定CT衰减值是否能准确分析结石成分。记录并比较结石的平均、最大和模态像素密度；结果值反映出结石密度存在相当大的异质性。尽管尿酸和胱氨酸结石可根据这些标准中的一项或多项的离散范围来识别，但包括鸟粪石在内的各种成分的含钙结石无法可靠区分。在体内结石成分特征分析方面，CT对结石密度的分析可能并不比标准X线摄影更准确。
