Why we do HRCT chest in COVID 19, How to calculate CT severity score

 

Why we do HRCT chest in COVID?

        High-resolution CT scan of the chest provides better visualisation of the extent and Nature of the lung involvement in patients with COVID 19. However any such additional information gained from CT scan of the chest often has little impact on treatment decisions.

Anatomy of the lungs.

       The lungs are the major organ of the respiratory system, and are divided into sections, or lobes.

        The right lung has three lobes and is slightly larger than the left lung, left lung which has two lobes. The lungs are separated by the mediastinum. The mediastinum contains the heart, trachea, esophagus, and many lymph nodes.

 

Section	Right lung	Left lung
Lobes	Upper lobe	Upper lobe
	Middle lobe	------
	Lower lobe	Lower lobe

 

COVID 19 directly affect the lungs and damages the alveoli (tiny air sacs).

How to calculate CT severity score in HRCT chest?

        Thera are five lobe in the lung. Per lobe score volume 0-5. Total score volume in lung 0-25. After HRCT perform doctor calculate total infection involvement in the lung 25 out of 0.

 

Category of CT severity score:-

Normal	0
Mild	1-7
Moderate	8-17
Severe	18 and above

This infection calculate only pneumonia not a COVID 19 positive or negative.

After RT-PCR (real time polymers chain reaction) report than confirm positive or negative.