The Imaging Effects of Body Weight and Contrast Injection Rate on Canine Caudal Aorta under 16-row Multidetector Computed Tomography
Date Issued
2008
Date
2008
Author(s)
Hu, Kwo-Chen
Abstract
Objective:To evaluate the effects of contrast medium in canine caudal aorta under 16- row multidetector computed tomography (MDCT) within two controlled variations, including:. Different contrast medium injection rate in two groups of similar body weight.. Two groups with different body weight administrate the same injection rate of contrast medium e expect to figure out the properties of contrast enhancement in the canine vascular system to improve the quality of contrast imaging, and to extend the applications of MDCT use in clinical veterinary medicine.nimals:Nineteen clients owned dogs without cardiovascular system diseases were collected and classified into three groups in this study. Group A and B were no statistically significant difference in body weight, and Group C were heavy than Group B.aterial and method:All dogs were anesthetized and positioned in sternal recumbency under 16-MDCT scanning. The total dose 500mg I/kg non-ionic contrast medium (370mg I/ml) were then administrated via cephalic vein. The injection rate was 3ml/sec., 4ml/sec. and 4ml/sec. for Group A, B and C, respectively. We measured the attenuation values in Hounsfield Unit (HU) for the caudal aorta at the level of trachea bifurcation which can be showed on the image.esult: n Group A and B, while group B (7.43 ± 1.01 sec) is faster than group A (9.35 ± 0.61 sec.) in achieving at the point of optimal enhancement and also has higher maximum enhancement attenuation (566.41 ± 56.13 HU) , Group A has longer period for optimal enhancement (12.8 ± 3.31 sec.). Compare Group B to Group C, Group C (13.74 ± 0.83 sec.) is slower than Group B (7.43 ± 1.01 sec.) in achieving at the point of enhancement, and Group B has shorter period for optimal enhancement (11.18 ± 2.47 sec.)iscussion:With similar body weight, the faster injection rate (4ml/sec.), the shorter time to reach the attenuation of initial optimal enhancement as well as the higher attenuation of maximum enhancement and the shorter optimal enhancement period. At the same injection rate the heavy dogs delayed the initial time of optimal enhancement, but has longer optimal enhancement period. The results of three groups were showed in time-enhancement curve within which the entire properties were similar to the relative reports of human medicine. However, an obvious difference is that the time- enhancement curve shift leftward.
Subjects
Multidetector computed tomography
MDCT
non-ionic contrast medium
dog
caudal aorta
time-enhancement curve
SDGs
Type
thesis
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