tripple phase liver

What is a three phase ct scan?

A three phase CT scan is a ct scan, usually of the liver, that requires an injection of contrast medium, this injection helps outline the vessels of your body by giving the x-rays something to be absorbed by besides blood which has a very low absorption rate. The phases are: 
1. Scan during injection: arterial phase, this will highlight lesions in or around the artery leading into the liver. 
2. Scan during injection or shortly after: portal vein phase, this will show lesions in or around the portal vein. 
3. Delayed scan after injection: this will allow the soft tissue to absorb the contrast and may highlight changes in tissue.

image of omu

ct image of omu

omu definition

The ostiomeatal complex (or unit) is a common channel that links the frontal sinus, anterior and middle ethmoid sinuses and the maxillary sinus to the middle meatus that allows air flow and mucocililary drainage. 

Gross anatomy

The ostiometal complex is composed of five structures:

· maxillary ostium - drainage channel of the maxillary sinus

· infundibilum - common channel that drains the ostia of the maxillary and ethmoid sinuses to the hiatus semilunaris

· ethmoidal bulla - usually a single air cell that projects inferomedially over the hiatus semilunaris

· uncinate process - hook-like process that arises from the posteromedial aspect of the nasolacrimal duct and forms the anterior boundary of the hiatus semilunaris

· hiatus semilunaris - final drainage passage; a region between the ethmoid bulla superiorly and free-edge of the uncinate process