Optimal Scan Time of Dual-phase Spiral CT in Normal Rabbit Liver: Effect of Contrast Injection Rate.
10.3348/jkrs.1999.40.6.1159
- Author:
Byung Kook KWAK
1
;
Sang Ho KIM
;
Wei Chiang LIU
;
Soo Ah KIM
;
Joung Joo WOO
;
Ju Hee HONG
;
Soon Yong KIM
;
Kook Hyun BAE
;
Chin Seung KIM
;
Song Joon YANG
;
Hyung Jin SHIM
;
Hyun Sik JEONG
Author Information
1. Department of Radiology, Sung Ae General Hospital, Korea.
- Publication Type:Original Article
- Keywords:
Computed tomography(CT), helical;
Contrast media, experimental studies;
Liver, CT
- MeSH:
Aorta;
Liver*;
Portal Vein;
Rabbits;
Tomography, Spiral Computed*
- From:Journal of the Korean Radiological Society
1999;40(6):1159-1164
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
PURPOSE: To determine the effect of contrast injection rate on rabbit liver enhancement and the optimaltem-poral window for dual-phase spiral CT of rabbit liver at each injection rate. MATERIALS AND METHODS: Usingspiral CT, seven New Zealand White rabbits underwent dynamic scanning at one level of liver. Three protocols ofcontrast injection rates were employed, namely 0.3 ml/sec(group 1), 1ml/sec(group 2) and 2 ml/sec(group 3). During120 seconds of total scan time, the scan interval was 3 seconds. Densities of the aorta, liver and portal veinwere averaged in equivalent time. The different injection rate protocols were compared for peak enhancement/timeon a time density curve. RESULTS: Mean peak enhancement (HU) in equivalent time(secs) was 310/18(group 1),383/9(group 2) and 357/6(group 3) in the aorta ; 34/36, 40/36 and 41/30 in the liver ; and 135/36, 153/24 and170/21 in the portal vein. The temporal window during the arterial phase was 12-21 sec(group 1), 6-12 sec(group2), and 6-12 sec(group 3). The temporal window during the portal phase was from 30 sec(0.3ml/sec), 21sec(1ml/sec)and 21 sec(2 ml/sec). CONCLUSION: During dual-phase spiral CT, the temporal window for liver scanningshould be determined according to each contrast injection rate. A slow contrast injection rate prolongs thetemporal window during the arterial phase.
