Deck 10: Exposure Factor Selection

Question 1

A technique chart should be established for:

A) each radiographer.
B) each radiographic tube.
C) each radiologist.
D) a and c

Answer 1

each radiographic tube.

Question 2

Technique charts are still needed when using Automatic Exposure Control (AEC).

Answer 2

True

Question 3

If a part measures 14 cm and requires the use of 75 kVp, how much kVp would a part measuring 18 cm require when using a variable kVp/fixed mAs technique chart?

A) 67 kVp
B) 77 kVp
C) 83 kVp
D) 91 kVp

Answer 3

83 kVp

Question 4

What are calipers used for?

A) To measure the mA
B) To select the S number
C) To select focal spot size
D) To measure the part

Question 5

Which of the following is NOT required to be part of a standardized technique chart?

A) SID
B) OID
C) mA
D) kVp

Question 6

When using a fixed kVp/variable mAs technique chart, if part thickness increases by 5 cm, what needs to happen to the mAs?

A) It should be halved.
B) It should be doubled.
C) It should be quartered.
D) It should be tripled.

Question 7

Optimal kVp values for each anatomic area have been established.

Question 8

Where does a radiographer find the established guidelines for selecting exposure factors for a radiographic examination?

A) Technique chart
B) Generator control panel
C) Examination requisition
D) b or c

Question 9

Which of the following is/are true regarding development of an effective technique chart?

A) The processor(s) must be consistent.
B) The equipment must be calibrated.
C) The equipment must be from the same manufacturer.
D) a and b

Question 10

What is the purpose of a technique chart?

A) To decrease patient exposure by always using the highest kVp required
B) To ensure consistent image quality
C) To reduce repeats due to technique error and, in turn, reduce patient exposure
D) b and c

Question 11

Departmental standards, such as the SID or whether an exam is done table-top or Bucky, should be determined:

A) prior to the development of technique charts.
B) after the development of technique charts.
C) at the same time as the development of technique charts.
D) whenever the department can come to an agreement.

Question 12

A patient measuring 26 cm requires 25 mAs at 75 kVp based on a fixed kVp/variable mAs technique chart. What technique should be used for the next patient, who measures 34 cm?

A) 50 mAs at 75 kVp
B) 100 mAs at 75 kVp
C) 25 mAs at 91 kVp
D) 50 mAs at 91 kVp

Question 13

Radiographic contrast would be standardized with the:

A) variable kVp/fixed mAs technique chart design.
B) variable kVp/variable mAs technique chart design.
C) fixed kVp/variable mAs technique chart design.
D) fixed kVp/fixed mAs technique chart design.

Question 14

Generally speaking, patient dose will be decreased with the:

A) variable kVp/fixed mAs technique chart design.
B) variable kVp/variable mAs technique chart design.
C) fixed kVp/variable mAs technique chart design.
D) fixed kVp/fixed mAs technique chart design.

Question 15

What kind of chart uses a kVp value that is high enough to adequately penetrate the part but does not diminish radiographic contrast?

A) A variable kVp technique chart
B) A fixed kVp technique chart
C) A fixed mAs technique chart
D) a and c

Question 16

The technique chart will provide information as to how to recognize and compensate for additive pathology.

Question 17

What is the appropriate change in kVp when using a variable kVp/fixed mAs technique chart for a 1 cm change in tissue thickness?

A) 2 kVp
B) 4 kVp
C) 6 kVp
D) 10 kVp

Question 18

Two identical rooms, having the same generator and tube and installed at the same time, do not require development of separate technique charts. The chart for one room can accurately be used in the other.

Question 19

A variable kVp/fixed mAs chart may be most effective with:

A) geriatric patients.
B) trauma patients.
C) patients imaged with mobile equipment.
D) pediatric patients.

Question 20

Accurate patient measurement is most critical for the:

A) variable kVp/fixed mAs technique chart design.
B) variable kVp/variable mAs technique chart design.
C) fixed kVp/variable mAs technique chart design.
D) fixed kVp/fixed mAs technique chart design.

Question 21

Using the concept of comparative anatomy, if a child's elbow measures the same as an adult wrist and all other procedural variables are the same (i.e., SID, image receptor type, etc.), the child's elbow will require _____ in comparison to the adult wrist.

A) less mAs
B) more mAs
C) the same mAs
D) higher kVp

Question 22

If a technique chart is being used and the resultant image is overexposed, the technologist should assume the chart is inaccurate and come up with his or her own exposure factors.