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Chest x ray basic knowlege
1. Chest x ray
how to solve it
Dr/ Allam Elsayed Allam
Assistant lecturer
Radiology department
Faculty of medicine
Ain shams university
2. Aim of presentation
1. to know the main anatomical structures.
2. main different views, when you call ,when you call.
3. adequate or not adequate film
4. Main and the commonest pathology
3. introduction
• What are x-rays?
• X-rays: a form of electromagnetic energy
• Travel at the speed of light
• Electromagnetic spectrum
– Gamma Rays
– X-rays
– Visible light
– Infrared light
– Microwaves
– Radio waves
4. Three things can happen
• X-rays can:
– Pass all the way through the body
– Be deflected or scattered
– Be absorbed
5. X-rays Passing Through Tissue
• Depends on the energy of the x-ray and the atomic
number of the tissue
• Higher energy x-ray - more likely to pass through
• Higher atomic number - more likely to absorb the x-ray
So
• X-rays that pass through the body to the film render the
film dark (black)
• X-rays that are totally blocked do not reach the film and
render the film light (white)
• Air = low atomic # = x-rays get through = image is dark
• Metal = high atomic # = x-rays blocked = image is light
(white)
14. Penetration
Adequate: should see the thoracic spine through the heart
If under-penetration: left hemi-diaphragm / lung
base is not visible and increased pulmonary vascular marking
If over-penetration: the verse