الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
from this study we concluded the following:
1- Spiral CT offers several significant advantages over conventional incremental CT in clinical practice.
* Short data acquisition times.
* Larger tissue coverage using thin collimation.
* Elimination of respiratory misregisteration and motion artifacts.
* Reduction of the total radiation dose to the patient.
* Using smaller volumes of contrast material.
* Production of overlapping images without additional radiation exposure.
2- Biphasic spiral CT represents a major advance in the way on non-invasive imaging CT evaluation of the liver.
* Hyper vascular tumors of the liver include HCC and metastases from renal cell carcinoma, melanoma, cardioids, pancreatic islet cell tumors and neuroendocrine tumors
* Colorectal metastases are the most common secondary malignant tumors of the liver.
* Portal venous phase remains the most sensitive CT imaging technique to detected hypo vascular tumors of the liver, which represents the majority of malignant hepatic neoplasms.
* Unique problems may be introduced; including visualization of previously UN detected lesions such as focal nodular hyperplasia.
* In patients with HCC, arterial phase images detected statistically significant more lesions that either unenhanced or portal phase images.
* Arterial phase images allow accurate characterization of hyper vascular benign lesions.
* A second run whether unehanced or arterial images, besides the standard portal phase imaging provide reassurance and more confidence to the radiologist.