Brown R C, Loening S A, Ehrhardt J C, Hawtrey C E
AJR Am J Roentgenol. 1980 Sep;135(3):565-7. doi: 10.2214/ajr.135.3.565.
Cystine calculi are said to be either radiolucent or radiopaque. In the past, contamination of the calculi with calcium has been given as the reason for a radiopaque appearance. However, most cystine stones are pure cystine and contain essentially no calcium. When compared to adjacent fluids and tissues, they are radiopaque because of their higher physical density and their higher effective atomic number.
胱氨酸结石据说是透X线或不透X线的。过去，结石中钙的污染被认为是不透X线表现的原因。然而，大多数胱氨酸结石是纯胱氨酸，基本不含钙。与相邻的液体和组织相比，它们不透X线是因为其物理密度较高且有效原子序数较高。
