الفهرس 
Anatomy of carotid vesselsOnly 14 pages are availabe for public view
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Abstract
Multi-slice helical CT is considered a new advance in the field of diagnostic radiology and an important tool for investigating and imaging the liver.
The high spatial resolution and relatively non-invasive nature make MDCT angiography a strong and serious competitor to established vascular imaging techniques.
Faster MDCT scanners have tremendous potential advantages, especially in the pediatric patient. These faster MDCT scanners leading to decrease the scanning time from the arterial to venous phase and so, reduction of radiation exposure to the patients and less use of contrast medium.
Multi-slice CT scanner can acquire thinner axial sections (1 to 2.5 mm) through the liver in a single breath-hold; the thinner sections result in greater resolution in the z-axis crucial for CT angiography. This excellent spatial resolution and fast scan times allow CT angiography to depict smaller vessels, not only for gross patency but also for stenosis. The increased speed of data acquisition allowed marked vascular contrast and less motion artifacts.
Multi-slice CT angiography of the liver is now considered as a practical noninvasive method of detecting hepatic vascular complications after liver transplantation.
Multi-slice CT angiography has several advantages over other imaging modalities. Compared with catheter angiography, CT angiography is noninvasive and is less than one-third the cost of conventional angiography.
Unlike sonography, CT angiography is not as dependent on the technologist performing the study or on the patient’s body habitus. Additionally, CT is more useful in detecting other post-transplantation complications including bile leaks, bile duct necrosis, hematomas, and abscesses. In fact, CT is commonly used in the postoperative period, in addition to routine sonography, to detect these nonvascular complications.
Multi-slice 3DCTA has been employed in both pre-transplant evaluations in potential recipients of living donor liver transplant and detection of vascular complication after liver transplant.
Recently, there have been several reports which suggested that multi-slice CT may allow the noninvasive creation of an accurate vascular map, and may be an alternative to conventional angiography in children, although conventional angiography is still necessary in cases where the imaging findings are not conclusive or prior to interventional procedures (63).
Our issue clarifies these facts concerning multi-slice CT angiography in the postoperative period of liver transplantation as showed in:-
• Normal multi-slice CT appearance after liver transplantation.
• Spectrum findings of multi-slice after liver transplantation.
In conclusion, Multi-slice CT is a safe, noninvasive, accurate, and reliable method that can be used to show patency, stenosis, or thrombosis of the hepatic vessels in liver transplant patients and to assess the presence and extent of damage to liver parenchyma (63).
So, multi-slice CT angiography with 3D volume rendering is an exciting modality that may be the most important imaging test required in the evaluation of patients after liver transplantation (77).