الفهرس 
Anatomy of the liver and portal veinOnly 14 pages are availabe for public view
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Abstract
Summary
The portal vein is formed by the junction of the splenic vein with
higher oxygen saturation and the superior mesenteric vein with digestive
products. It is divided to right main portal vein and left main portal vein,
multiple variations are detected, and trifurcation of portal vein is the
most common. The intraportal and intrahepatic distribution of the blood
flow from each vein to the portal vein has been evaluated by several
imaging modalities Ultrasound, CT and conventional contrast MRI.
Both CT and MR contrast agents have a risk of contrast-medium–
induced nephropathy and have various side effects, including rare
but lethal reactions such as anaphylactic shock and nephrogenic systemic
fibrosis consequently, these contrast agents should not be administered
to patients with decreased renal function.
Recent development of high-performance gradient MR systems
allows the clinical use of unenhanced MR angiography techniques with
high quality for portal flow imaging. RT-SSFP (respiratory triggered
steady state free precision & inversion recovery pulse) has the ability to
demonstrate portal venous flow as high signal intensity without the use
of gadolinium-based contrast agent this is beneficial for patients who
will undergo surgical procedures such as hepatic transplantation.
The aim of this study is to delineate portal vein anatomy, portal
vein variations and assess the ability of RT-SSFP to reveal different
portal vein pathological conditions.
This study was conducted over 24 hepatic patients with different
portal vein pathological conditions including portal vein thrombosis
either complete or partial thrombosis, portal hypertension and cavernous