CT scan PNS paranasal sinuse

 

• What is PNS?

           PNS is known as paranasal sinuses. The paranasal sinuses are air field extensions of the nasal cavity. There are 4 pear of sinuses are named according to the bone in which they are located. 

Maxillary sinuses.

Frontal sinuses.

Ethmoid sinuses. 

Sphenoid sinuses.

• What are they stracture ?

            Maxillary sinuses is largest in the paranasal sinuses, are under the eye, in the maxillary bone.

The frontal sinuses superior to eyes, in the frontal bone, which form the hard part of the forehead.

The ethmoid sinuses, formed from several discrete air cells within the ethmoid bone between the nose and eye.

The sphenoid sinuses are located in sphenoid bone.

 

• What are they function?

1. Supporting immune defence of the nasal cavity.
2. Lightening the weight of the head.
3. Humidifying and heating inhaled air.
4. Increase the resonance of the voice.

 

• Why do a CT scan of PNS?

          Help diagnose sinusitis :- evaluate sinuses that are filled with fluid or thickened sinus membranes. Detect the polyps and inflammatory diseases. Provide information about tumours of the nasal cavity.

 

• What does CT PNS show?

An inflammation of the membranes lining the nose.

Facial injury or bone fracture.

Chronic sinusitis with polyps.

(DNS) deviated nasal septum.

Some orbit disease.

• Windows in CT scan of PNS.

  There are two windows and three sections.

Bone window:-

Windows	Sections	Apering in CT scan
Bone	Axial, coronal and sagittal	Images of the bone window demonstrate the normal anatomy of the paranasal sinuses and the integrity of the nasal septum, nasal bone and nasal Pyramid.
Soft tissue/sinuses	Axial, coronal and sagittal	Soft tissue is specially for blood vessels and other collation s

 

Bone window axial:-

Bone window axial

Soft window axial:-

PNS soft window axial

• Do you need contrast for CT sinus?

         This examination dose not commanly require contrast material. In some situations your physian may request that contrast material be given.

• Why is contrast needed in CT scan?

         A special dye is called contrast material is needed for some CT SCAN to help highlight the area of your body being examined.

Before do contrast scan creatinine report is important.

 

• Before doing CT scan Technologist asking they patients history.

Headache or giddiness.

Facial swelling and HOW many day’s.

Any trauma.

Old reports CT or MRI.

Any operative history.

 

• Bone window coronal:-

 

PNS bone window coronal

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