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NEET MDS Quiz - Practice Test

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Radiology - 3 Questions

1
Radiology
Reflecting layer used in intensifying screens
1) Calcium tungstate
2) Titanium oxide & magnesium carbonate
3) Gaddinium oxysulphide
4) Lanthanum oxybromide

📝 Explanation:

The reflecting layer in intensifying screens is made of titanium oxide and magnesium carbonate. This layer reflects light back toward the film, increasing the efficiency of the screen by ensuring that light photons traveling away from the film are redirected back to contribute to image formation.

2
Radiology
In cephalometric radiography the distance between the subject and the source of X-ray is 
 1. 2 feet
 2. 48 inches
 3. 4.8 meters
 4. 5 feet

📝 Explanation:

In cephalometric radiography, the distance between the subject and the source of X-ray is 5 feet.

3
Radiology
Screen films differ form non-screen films in that
1) They are more sensitive to light than X-rays
2) They are more sensitive to X-rays than light
3) They are usually used in intraoral radiography
4) They do not need intensifying screens

📝 Explanation:

Screen films are specifically designed to be more sensitive to light than to X-rays. They work in conjunction with intensifying screens that convert X-ray energy to light photons. The film responds primarily to the light emitted by the phosphors in the intensifying screens, not directly to X-rays.

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