[Application of technetium galactosyl human serum albumin diethylenetriamine pentaacetic acid injection on liver imaging in mouse models with different hepatic injuries].

OBJECTIVE: To identify the uptake and biological distribution of technetium galactosyl human serum albumin diethylenetriamine pentaacetic acid injection (99mTc-GSA) in three mouse models with different degrees of hepatic injuries. METHODS: Three mouse models including hepatic fibrosis, hepatic cholestasis, and liver cancer were established. Hepatic fibrosis model was established by intraperitoneal injection of carbon tetrachloride, 0.4 ml 10%, every 48 hours for 48 days. Hepatic cholestasis model was set up by ligature of the common bile duct for 72 hours, and liver cancer model by implantation of H22 tumor cells underneath liver capsule for 10 days. On measurement, each mouse in different models and normal controls was injected with 0.1 ml (0.37 MBq)99mTc-GSA (2 microg) into vena caudalis, and 5 minutes later sacrificed by decapitation. Important organs and tissues including liver, heart, lungs, kidney, spleen, stomach, blood, bones, muscles, and intestines were taken and their different radio countings were measured. The hepatic injuries were evaluated with serum and pathological examinations. RESULTS: 99mTc-GSA was concentrated in the liver in all three models and the control mice ( >40% ID x g(-1)). Compared with the control mice (90.05 +/- 10.55)% ID x g(-1), the density of 99mTc-GSA was significantly lower in the models with hepatic injuries (P < 0.001). The liver function test indicated that the injury in hepatic fibrosis model was less serious than those in the other two models. However, the concentration of 99mTc-GSA in hepatic fibrosis model [(72.20 +/- 2.13)% ID x g(-1)] was significantly higher than those in the models with cholestasis [(56.72 +/- 5.92)% ID x g(-1)] and liver cancer [(42.80 +/- 6.05)% ID x g(-1)] (P < 0.001). CONCLUSIONS: 99mTc-GSA may well concentrate in liver and its concentration degree is adversely correlated with hepatic injuries. Therefore 99mTc-GSA may be clinically used as liver imaging agent. When combined with three-dimensional scanning technique, it may facilitate constructing a new three-dimensional imaging method to demonstrate the function of designed liver segments.

[Preoperative evaluation of liver function using 99mTc-diethyl iminodiacetic acid based on single photon emission computed tomography].

OBJECTIVE: To establish a three-dimentional liver function evaluation system using 99mTc-diethyl iminodiacetic acid (99mTc-EHIDA) scintigraphy based on single photon emission computed tomography (SPECT). METHODS: Totally 16 patients with liver lesions were divided into cirrhosis group and non-cirrhosis group. SPECT was performed 2 days before operation and 5 days after operation. Serum liver functions were examined on the same day of scintigraphy. SPECT images of areas of interest of heart and liver were aquired. Time of the peak of EHIDA density in liver (Tpeak), five-minutes heart liver index (HLI5), blood clearance index (HH15), receptor index (LHL15), and the predictive values were calculated. RESULTS: Tpeak was not significantly different between two groups, while HLI5, HH15, and LHL15 were significantly different (P = 0.033, P = 0.001, and P = 0.005). HLI, and LHL15 were significantly correlated with preoperative total protein and prealbumin levels (P = 0.003, P = 0.015, P = 0.022, P = 0.038) and post-operative prealbumin (P = 0.037, P = 0.042). The predictive values of HLI5 and LHL15 correlated well with postoperative HLI5 and LHL15 (r = 0.675, P = 0.016; r = 0.629, P = 0.028). CONCLUSION: The three-dimentional liver function evaluation system using 99mTc-EHIDA based on liver SPECT may facilitate the further studies of risks of liver surgery.