Table 4.

Summarized imaging techniques with their limitations

Method	Technique	Limitations
Ultrasonography	Identification of portal hypertension	Limited capability to measure mild or moderate fibrosis and cirrhosis, contradictory results
Elastography	Liver stiffness	Vulnerable measurements due to narrow intercostals spaces, ascites or obesity
Doppler Analysis	Measures velocity of blood flow, hemodynamic variations	Limited data, lack of reproducibility, contradictory results
Magnetic Resonance Imaging	Observe changes in hepatic parenchyma	High cost, lack of research support
Computed Tomography	Identifies micro vascular permeability changes	Recent technique, not much literature is available, can not performed in renal failure and contrast agent allergic patients