tailieunhanh - Báo cáo khoa học: "Three-dimensional CT angiography of the canine hepatic vasculature"

Tuyển tập các báo cáo nghiên cứu khoa học quốc tế về bệnh thú y đề tài: Three-dimensional CT angiography of the canine hepatic vasculature | J. Vet. Sci. 2008 9 4 407-413 JOURNAL OF Veterinary Science Three-dimensional CT angiography of the canine hepatic vasculature Yucheol Jeong Changyun Lim Sunkyoung Oh Joohyun Jung Jinhwa Chang Junghee Yoon Mincheol Choi Department of Radiology College of Veterinary Medicine Seoul National University Seoul 151-742 Korea Eight Beagle dogs were anesthetized and were imaged using a single channel helical CT scanner. The contrast medium used in this study was iohexol 300 mg I ml and doses were ml kg for a cine scan 3 ml kg for an enhanced scan. The flow rate for contrast material administration was 2 ml sec for all scans. This study was divided into three steps with unenhanced cine and enhanced scans. The enhanced scan was subdivided into the arterial phase and the venous phase. All of the enhanced scans were reconstructed in 1 mm intervals and the scans were interpreted by the use of reformatted images a cross sectional histogram maximum intensity projection and shaded surface display. For the cine scans optimal times were a 9-sec delay time post IV injection in the arterial phase and an 18-sec delay time post IV injection in the venous phase. A nine-sec delay time was acceptable for the imaging of the canine hepatic arteries by CT angiography. After completion of arterial phase scanning venous structures of the liver were well visualized as seen on the venous phase. Keywords angiography computed tomography dual phase liver vasculature three-dimensional image Introduction Computed tomography angiography CTA is a simple and noninvasive procedure for the evaluation of the hepatic vasculature. Although conventional angiography can also provide assessment of the hepatic vasculature the modality is invasive and more technically difficult to perform than CTA. CTA is replacing conventional angiography in the depiction of the normal vascular anatomy and the diagnosis of vascular disorders 10 . However CTA two-dimensional 2D images do not provide complete three-dimensional