Patient dose in radiography can be reduced by: a. Increasing the focu

1.	Patient dose in radiography can be reduced by: a. Increasing the focus-to-film distance b. Compression c. Collimation d. Using a secondary radiation grid e. Using the air-gap technique
Answer» a. True. Even though increasing the distance necessitates the increase in mAs, it decreases the skin dose as the beam entering the patient is spread over a larger surface area. It also decreases the dose to deeper tissues to a lesser extent. b. True. This is due to a reduction of the required exposure factors (less tissue thickness to penetrate) and the amount of scattered radiation. c. True. d. False. The exit dose needs to be increased by a factor equal to the Bucky factor of the grid (the ratio of radiation incident on the grid to the transmitted radiation) to obtain the same film exposure. e. False. Use of an air gap requires a higher tube output and increases the patient dose.

Patient dose in radiography can be reduced by: a. Increasing the focus-to-film distance b. Compression c. Collimation d. Using a secondary radiation grid e. Using the air-gap technique

Answer»

a. True. Even though increasing the distance necessitates the increase in mAs, it decreases the skin dose as the beam entering the patient is spread over a larger surface area. It also decreases the dose to deeper tissues to a lesser extent.

b. True. This is due to a reduction of the required exposure factors (less tissue thickness to penetrate) and the amount of scattered radiation.

c. True.

d. False. The exit dose needs to be increased by a factor equal to the Bucky factor of the grid (the ratio of radiation incident on the grid to the transmitted radiation) to obtain the same film exposure.

e. False. Use of an air gap requires a higher tube output and increases the patient dose.

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