Optical Density and X-ray Basics

What is the relationship between mAs and optical density?

• Inversely proportional

• Directly proportional

• Exponentially proportional

• No relationship

Which optical density value represents a clear radiograph?

• 0.1 OD

• 0.3 OD

• 2 OD

• 4 OD

What percentage of light is transmitted through a film with an optical density of 1 OD?

• 50%

• 20%

• 10%

• 5%

What happens to optical density if mAs is halved?

• It doubles.

• It decreases.

• It remains unchanged.

• It reduces by half.

Which factor primarily affects the energy of the X-ray beam?

• kVp

• mAs

• OID

• SID

What happens to optical density when SID is increased?

• Increases

• Decreases

• Stays constant

• Increases exponentially

What optical density value typically indicates overexposure on a radiograph?

• 1 OD

• 2 OD

• 3 OD

• 4 OD

Which part of the characteristic curve corresponds to low exposure levels?

• Shoulder

• Straight-line portion

• Toe

• Base plus fog

How much change in mAs is needed to perceive a difference in optical density?

• 15%

• 20%

• 25%

• 30%

What is the term for the inherent OD in unexposed film?

• Base density

• Fog density

• Scatter density

• Contrast density