Pettigrew R I, Witztum K F, Perkins G C, Johnson M L, Burks R N, Verba J W, Halpern S E
Radiology. 1984 Jan;150(1):219-23. doi: 10.1148/radiology.150.1.6606191.
Because of the high target-to-background contrast obtained with single photon emission computed tomography (SPECT), normal intrahepatic vessels approximately 2 cm in diameter may appear as distinct focal defects in tomographic sections throughout the liver even though normal vessels rarely cause such defects on planar images. To assess this problem, five subjects without evidence of liver disease underwent tomography of the liver with Tc-99m sulfur colloid (TSC) and on a separate occasion tomography of the intrahepatic blood pool with Tc-99m autologous red blood cells (RBC). In each case, well demarcated defects were obvious in contiguous TSC liver tomograms in various planes. Direct comparison with RBC tomograms showed that all of these defects corresponded to intrahepatic veins, typically the right portal vein, its posterior branch, and the left portal vein. Knowledge of the intrahepatic vascular anatomy in a variety of tomographic planes, with examination of each defect in multiple orthogonal planes is necessary to avoid false positive interpretations. In some instances a study with RBC may also be required for more conclusive evaluation of defects seen on TSC liver tomograms.
由于单光子发射计算机断层扫描（SPECT）可获得较高的靶本底对比度，即使正常血管在平面图像上很少造成这种缺损，但直径约2厘米的正常肝内血管在整个肝脏的断层图像上可能表现为明显的局灶性缺损。为评估这一问题，对5名无肝病证据的受试者进行了99m锝硫胶体（TSC）肝脏断层扫描，并在另一次检查中用99m锝自体红细胞（RBC）进行了肝内血池断层扫描。在每种情况下，在不同平面的连续TSC肝脏断层图像中均可见界限清晰的缺损。与RBC断层图像直接对比显示，所有这些缺损均对应于肝内静脉，通常是右门静脉、其后支和左门静脉。了解各种断层平面的肝内血管解剖结构，并在多个正交平面上检查每个缺损，对于避免假阳性解释是必要的。在某些情况下，可能还需要进行RBC检查，以便更确凿地评估TSC肝脏断层图像上所见的缺损。
