LRA 216 Week 3 Quiz - Key Medical Terms & Definitions

The function of a filter is to remove which of the following from the x-ray beam?

long wavelength radiation

Which of the following is the best type of gonadal shield to use during a sterile field procedure?

shadow

* Which of the following is not a type of beam limitation device?

Filter

Which of the following is the most versatile type of x-ray beam limitation device?

collimator

Which of the following combinations would reduce patient radiation dose during an x-ray exam?

higher kVp, lower mAs, increased filtration

To within what percent of the SID must the collimator light and actual irradiated area be accurate?

2%

The greatest beam limitation is accomplished when the cone/cylinder is _____, and the diameter opening is _____.

Longer, Smaller

How much total filtration is required when using over 70 kVp?

2.5 mm Al

Which of the following exposure techniques will provide the least amount of radiation exposure to the patient?

50 mAs, 90 kVp

The number of repeat radiographs can be reduced by

eliminating voluntary patient motion using immobilization devices

Half-value layer (HVL) is defined as the thickness of a designated absorber required to

decrease the intensity of the primary beam by 50% of its initial value

Using CR, it is estimated that overexposures of up to _____, and underexposures up to _____ are recoverable, thus eliminating the need for retakes.

500%, 80%

An effective way of reducing patient dose is through

accurate and effective positioning

Which of the following are placed between the patient and the image receptor (IR) to preferentially absorb scatter radiation?

radiographic grids

One way to ensure against irradiating a women in the early stages of pregnancy is to institute _____ for nonemergency procedures.

elective scheduling

Causes of repeat radio graphs include the following:

1. dirty screens

2. incorrectly loaded cassettes

3. light leaks

4. chemical fog

5. processor artifacts

1, 2, 3, 4 and 5

Which of the following produce the greatest radiation exposure in diagnostic radiology?

fluoroscopic procedures