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A Correlation Study on the Peak Attenuation and the Shift Time at the Peak of the Normal Pancreas and Abdominal Aorta

Zhang Xi-rong, Huang Xiao-hua, Dong Guo-li, Guo Chang-yi, Jing Zong-li, Guo Jing, Feng Ying

Objective To explore the relationship between the peak attenuation and the shift time at the peak of the normal pancreas and abdominal aorta by applying the multi-slice spiral computed tomography perfusion imaging. Methods According to the inclusive criteria, randomly chose 62 patients who received contrast-enhanced computed tomography examination for the superior or the middle abdomen, planar scanning was used first, then performed median level single-location dynamic computed tomography perfusion imaging by applying a multi-slice spiral computed tomography scanner, the tube tension was 120 kV, tube current was 200 mA, matrix was 512×512, slice thickness was 4×1, rotation time was1s/r, interval was 1s and pitch was 0. Bolus injection was done via medial cubital vein by using 50 mL contrast agent, at a flow rate of 6 mL/s with a powerful injector, and 6 seconds delayed, and data acquisition lasted for 45 seconds. These data were processed on a Start Vitreal 2.0 worker-station by using Toshiba body software package. The Time-Density Curves of the normal pancreas and abdominal aorta were drawn, the peak attenuation and the shift time of peak attenuation were recorded and the relationship between peak attenuation and the shift time were analyzed. Results The mean values of peak attenuation of the normal pancreas and abdominal aorta were (111.94±14.42) Hu and (351.83±74.93) Hu respectively; the mean difference was (246.10±65.86) Hu and the value of peak attenuation of the normal pancreas was positively and linearly correlated with that of abdominal aorta (γ=0.438, P<0.05). The mean shift times of peak attenuation of the normal pancreas and abdominal aorta were (37.61±7.20) and (30.77±6.26) respectively; the mean difference was (6.41±2.51) and the shift time of PA of the normal pancreas was positively and linearly correlated with that of abdominal aorta (γ=0.379, P<0.05). Conclusion The peak attenuation of the normal pancreas is not synchronized with the peak attenuation of the abdominal aorta. The shift time of the former is usually 6-8 seconds slower than that of the latter.