When we examine lower limb in plaster of Paris we have to.. Increase exposure time

When we examine lower limb in plaster of Paris we have to:

• A- Increase KV
• B- Increase mA
• C- Increase exposure time
• D- Decrease KV
• E- Decrease mA

The correct answer is (C) Increase exposure time.

When we examine lower limb in plaster of Paris we have to increase exposure time because the plaster of Paris will absorb some of the X-rays, making it necessary to increase the exposure time to get a clear image.

The other answer choices are incorrect because:

• (A) Increase KV would increase the penetration of the X-rays, but it would also make the image more blurry.
• (B) Increase mA would increase the amount of X-rays that are produced, but it would also make the image more noisy.
• (D) Decrease KV would decrease the penetration of the X-rays, making it difficult to get a clear image.
• (E) Decrease mA would decrease the amount of X-rays that are produced, making it difficult to get a clear image.

Therefore, the best way to get a clear image of a lower limb in plaster of Paris is to increase the exposure time.

Here are some tips for taking X-rays of a lower limb in plaster of Paris:

• Use a lower kV than you would normally use for an X-ray of a lower limb without plaster.
• Use a higher mA than you would normally use for an X-ray of a lower limb without plaster.
• Use a longer exposure time than you would normally use for an X-ray of a lower limb without plaster.
• Collimate the X-ray beam to the area of interest.
• Use a grid to reduce scatter radiation.
• Use a sharp X-ray tube to improve image quality.
• Position the patient correctly.
• Use the correct exposure factors.
• Process the X-ray film correctly.