Deck 10: Formulating X-Ray Techniques

Question 1

How much of a change in mAs is needed if there is a 2-cm increase in the part size?

A) 20%
B) 25%
C) 30%
D) 40%

Answer 1

30%

Question 2

Technique charts are based on:

A) patient weight and body habitus.
B) processor temperature and replenishment rates.
C) thickness of the body part to be radiographed.
D) nature of the suspected pathologic condition.

Answer 2

thickness of the body part to be radiographed.

Question 3

Technique charts are based on patient-body part measurements obtained using an x-ray caliper. These measurements are expressed as:

A) circumference in inches.
B) part thickness in centimeters.
C) diameter in centimeters.
D) part thickness and width in inches.

Answer 3

part thickness in centimeters.

Question 4

Which of the following,if changed permanently,would require a change in the technique chart?
1) kVp
2) mA
3) SID

A) 1 and 2 only
B) 1 and 3 only
C) 2 and 3 only
D) 1, 2, and 3

Question 5

Which of the following are types of technique charts?

A) Variable mAs and fixed mAs
B) Variable mAs and variable kVp
C) Variable kVp and fixed kVp
D) Variable kVp and fixed mAs

Question 6

A listing of the various radiographic examinations performed in a radiographic room along with the exposure factors is called a(n):

A) technique chart.
B) exposure index.
C) tube rating chart.
D) caliper chart.

Question 7

Which of the following approaches to technique charts will provide the highest kVp setting,the lowest patient dose,and the greatest exposure latitude?

A) High kVp
B) Optimum kVp
C) Medium kVp
D) Low kVp

Question 8

A good reason for selecting a low mA station to obtain a given amount of mAs is to:

A) reduce motion blur.
B) use the small focal spot.
C) obtain optimum kilovoltage.
D) maintain the SID at 40 inches.

Question 9

What is a radiographic phantom?

A) An unwanted density on an x-ray image
B) Another name for an artifact
C) A human skeleton or part of a skeleton encased in plastic to simulate human tissue
D) A tool for measuring body parts to set exposure factors

Question 10

A satisfactory radiograph is made using 20 mAs at 40 inches SID. How much mAs is needed to produce a similar radiograph at 60 inches SID?

A) 30 mAs
B) 35 mAs
C) 45 mAs
D) 55 mAs

Question 11

Which of the following statements regarding technique charts is true? Technique charts are

A) the same for every radiology department.
B) the same for every x-ray machine within a radiology department.
C) the same regardless of IR, grid, SID, and other factors.
D) unique to each x-ray machine and each facility.

Question 12

Which of the following methods are effective ways to obtain a technique chart?
1) Create one using a Supertech® calculator.
2) Request assistance from the equipment manufacturer's technical representative.
3) Hire a radiographer consultant who is experienced in technique chart preparation.

A) 1 and 2 only
B) 1 and 3 only
C) 2 and 3 only
D) 1, 2, and 3

Question 13

Using the principle of "optimum kilovoltage" to formulate exposure techniques will result in _____ patient exposure and _____ exposure latitude.

A) high; narrow
B) high; great
C) the least; narrow
D) the least; wide

Question 14

What is the correct exposure time required to produce 50 mAs when using the 200 mA station?

A) 0.25 second
B) 4 seconds
C) 2.5 seconds
D) 0.4 second

Question 15

How does one determine if the mA station is obtainable at the desired kVp without exceeding the capacity of the x-ray tube?

A) Consult the technique chart.
B) Consult the tube rating chart.
C) Consult the generator maximum ratings.
D) Consult the equipment manufacturer's engineer.

Question 16

What is an advantage of the variable kVp technique chart?

A) It is easier to calculate.
B) The overall image contrast is lower, which can provide greater visibility of detail.
C) It prompts less patient exposure on most examinations.
D) It produces fewer heat units per exposure.

Question 17

Which type of technique chart has a specific mAs value for each projection and uses small changes in kVp to compensate for variances in patient or part size?

A) Fixed kVp
B) Variable kVp
C) Fixed SID
D) Variable SID

Question 18

A good reason for sometimes selecting the highest available mA station to obtain a given amount of mAs is to:

A) keep the exposure time as short as possible.
B) use the small focal spot.
C) prevent excessive anode heat.
D) accommodate breathing technique.

Question 19

Which of the following may be a cause of technique chart "failure"?

A) Incorrect mA station selection
B) Excessive exposure time
C) Insufficient exposure time
D) kVp level not optimum to penetrate the part

Question 20

What is the name of the organization that requires technique charts be posted for every radiographic room?

A) State Department of Health
B) The Joint Commission
C) American Society of Radiologic Technologists
D) American Registry of Radiologic Technologists

Question 21

Which radiographic quality characteristic is primarily affected by kVp?

A) Density
B) Contrast
C) Spatial resolution
D) Distortion

Question 22

Which of the following pathologic conditions require an increase in exposure factors?
1) Pneumonia
2) Paget disease
3) Bowel obstruction

A) 1 and 2 only
B) 1 and 3 only
C) 2 and 3 only
D) 1, 2, and 3

Question 23

The minimum amount of mAs change that will prompt a visible change in image density is:

A) 5%.
B) 10%.
C) 20%.
D) 30%.

Question 24

Which category of patient seldom requires a compensating filter for general radiographic examinations?

A) Geriatric
B) Pediatric
C) Age 18 to 24
D) Age 18 to 35

Question 25

What is the major limitation in obtaining images of obese patients?

A) A strong enough table to hold the patient
B) Reduced resolution due to motion
C) Inadequate penetration of the body part
D) Inability to adjust the mAs high enough

Question 26

Which of the following body parts can benefit from the use of a compensating filter?

A) AP thoracic spine
B) AP abdomen
C) AP cervical spine
D) AP skull

Question 27

Which of the following pathologic conditions require a decrease in exposure technique?
1) Multiple myeloma
2) Emphysema
3) Osteoporosis

A) 1 and 2 only
B) 1 and 3 only
C) 2 and 3 only
D) 1, 2, and 3

Question 28

When an image is too light,what is usually the best technique adjustment for the repeat radiograph?

A) Increase the mAs 100%.
B) Decrease the mAs 50%.
C) Increase the kVp 100%.
D) Decrease the kVp 50%.

Question 29

Advantages of using a fixed kVp technique chart include which of the following?
1) Contrast is lower.
2) Exposures will have more latitude.
3) Patient exposures are lower.

A) 1 and 2
B) 1 and 3
C) 2 and 3
D) 1, 2, and 3

Question 30

What is the single most important technical exposure adjustment that should be made when imaging an obese patient?

A) Decreasing the kVp
B) Increasing the kVp
C) Decreasing the mAs
D) Increasing the mAs

Question 31

Which technical factor should be used to correct problems with radiographic density?

A) SID
B) Grid ratio
C) mAs
D) kVp

Question 32

Which of the following would cause a radiograph to have too much contrast?

A) kVp level set too low
B) kVp level set too high
C) mA station too low
D) mA station too high

Question 33

An increase in exposure technique would be required if a patient had:

A) cardiomegaly.
B) osteoporosis
C) pneumonia.
D) advanced age.

Question 34

If the kVp is increased using the "15% rule," an 80-kVp exposure would change to which of the following?

A) 68 kVp
B) 92 kVp
C) 105 kVp
D) 160 kVp

Question 35

Which technical factor is used to alter radiographic contrast?

A) mA
B) Exposure time
C) kVp
D) SID

Question 36

Which groups of patients need "specialized" technique charts?
1) Obese
2) Pediatric
3) Very muscular

A) 1 and 2
B) 1 and 3
C) 2 and 3
D) 1, 2, and 3

Question 37

A decrease in exposure technique would be required if a patient had:

A) cardiomegaly.
B) degenerative arthritis.
C) pleural effusion.
D) rheumatoid arthritis.