Radiographic technique Charts

Question 1

As an RT we have a moral obligation to?

Answer 1

Provide the pt with quality radiographs with the least amount of exposure.
Technique charts are scientific aid to assist the RT in achieving this goal.

Question 2

Prior to developing a technique chart, how can we standardize the equipment.

Answer 2

1. Radiographic units should be calibrated for consistent output.
2. Grids should be standardized (grid ratios)
3. IR speed should be standardized and screens or imaging plates should be clean and undamaged
4. Collimator light field/radiation field should be aligned
5. When formulating the technique chart, use the same IR, grid and processor for each exposure.

Question 3

Test exposures should be done

Answer 3

With phantoms and never on actual patients

Question 4

Two types of technique charts

Answer 4

1. Fixed or High kilovoltage technique charts

2. Variable kilovoltage technique chart

Question 5

Fixes kilovoltage technique is aka

Answer 5

Optimal or high kVp

Question 6

One a fixed technique chart, the kV selection is based on?

Answer 6

The penetrating quality of the beam for the average adult patient.

Question 7

What is the variable when using a fixed kilovoltage technique chart?

Answer 7

mAs

Question 8

Benefits of fixed kilovoltage technique

Answer 8

1. Simple to use
2. Greater technical accuracy
3. Maintains a constant level of contrast.
4. Achieve consistent quality; each radiographer should produce radiographs with similar quality.

Question 9

When you vary your kV, you affect

Answer 9

Contrast
Density
Exposure latitude 
Quality of radiation
Production of scatter radiation
Production of secondary radiation

Question 10

How does the decrease in quantity of radiation effect quality and wear on equipment

Answer 10

Increases quality and decreases wear in equipment.

Question 11

Exposure to the pt is less with which kVp technique system? Why?

Answer 11

With variable kV systems since the kV used is higher

Question 12

Using fixed kV system, and the optimal kV for part, what mAs adjustment occurs for small patients

Answer 12

1/2 “x” mAs

Question 13

Using fixed kV system, and the optimal kV for part, what mAs adjustment occurs for average patient

Answer 13

“X” mAs

Question 14

Using fixed kV system, and the optimal kV for part, what mAs adjustment occurs for large pt

Answer 14

2 “x” mAs

Question 15

In a variable technique system, how are kVp mAs modified?

Answer 15

kVp is used to compensate for variations in the thickness of the part,
mAs is modified for tissue density if needed.

Question 16

General rule for selecting technique;

Basic formula to determine appropriate kV

Answer 16

2 times centimeter thickness + 30 kV

Question 17

When you use variable kV system, and use the basic formula, how is the contrast effected?

Answer 17

Gives more short scale contrast

Question 18

For each centimeter increase in thickness, how do you adjust kV

Answer 18

Add 2 kV

Question 19

Class A patients are

Answer 19

Emaciated

Easy to penetrate disease processes

Question 20

Class B patients are

Answer 20

Normal patients

Question 21

Class C patients are

Answer 21

Difficult to penetrate due to disease process or are muscular

Question 22

Class A patients adjust mAs by

Answer 22

Decreasing mAs by 30%

Question 23

Class C patients adjust mAs by

Answer 23

Increasing mAs by 30%

Question 24

Parts in the recommended kVp range of 50-55

Answer 24

Wrist
Hand
Foot
Fingers

Question 25

Parts in the recommended kVp range of 55-60

Answer 25

Ankle

Question 26

Parts in the recommended kVp range of 60-70

Answer 26

Ribs

Knees

Question 27

According to the ASRT the technique chart is called

Answer 27

Radiographic. Exposure Technique Guidelines

Question 28

Radiographic. Exposure Technique Guidelines

Answer 28

All health care facilities develop, maintain, and make available optimal exposure technique guidelines for all Radiographic and fluoroscopic equipment.

Question 29

Radiographic. Exposure Technique Guidelines 70-80 kVp

Answer 29

Skull
Spine
Abdomen

Question 30

Radiographic. Exposure Technique Guidelines 65-80 kVp

Answer 30

Pelvis

Hip

Question 31

Radiographic. Exposure Technique Guidelines 65-75kVp

Answer 31

Cervical spine

Femur

Question 32

Increased attenuation conditions are aka

Answer 32

Additive

Increased attenuation conditions