Question

Methods that can be used to reduce patient exposure include increased (select the 3 correct completions)

1. beam restriction
2. kV
3. exposure time
4. mAs
5. SID
6. filtration

A) 1, 3, and 6
B) 2, 3, and 5
C) 3, 4, and 5
D) 1, 2, and 6

Answer 1

The correct choices for reducing patient exposure include options 1 (beam restriction), 3 (exposure time), and 6 (filtration). Therefore, the correct answer is A) 1, 3, and 6.

Step-by-step explanation:

To minimize patient exposure during radiographic procedures, implementing beam restriction, adjusting exposure time, and utilizing proper filtration are essential measures.

1. Beam Restriction (Option 1):

Beam restriction involves limiting the size of the X-ray beam to the area of interest, thereby reducing unnecessary radiation exposure to surrounding tissues. This is achieved by using collimators or aperture diaphragms to control the size and shape of the X-ray field.

2. Exposure Time (Option 3):

Exposure time refers to the duration for which the X-ray tube emits radiation. By reducing the exposure time, the total amount of radiation reaching the patient is decreased. The relationship between exposure time (t), tube current (mA), and exposure (mAs) is given by the formula:

`\[mAs = mA * t\]`

Therefore, lowering the exposure time reduces the overall exposure to the patient.

3. Filtration (Option 6):

Filtration involves the use of materials to selectively absorb low-energy X-rays, resulting in a beam with higher average energy. This not only improves image quality but also reduces patient dose. The total filtration (F) is the sum of inherent (Fi) and added filtration (Fa):

`\[F = Fi + Fa\]`

By optimizing filtration, unnecessary low-energy X-rays are removed, contributing to a safer imaging process.