lesson 7

Question 1

These are written tables that provide a means of
determining the specific technical factors to be used for
a given radiographic examination.

Answer 1

RADIOGRAPHIC TECHNIQUE CHART

Question 2

Requirements for Radiographic Technique Chart:

Answer 2

1. Calibrated x-ray machine
2. Manual or automatic processor must be in good
   condition
3. Total filtration of 2.5 – 3 mm. Al equivalent is
   necessary
4. Types of grid
5. Collimator accuracy

Question 3

It uses a fixed mAs and a kVp that varied according to
the thickness of the anatomic part.

Answer 3

Variable-kVp Technique Chart

Question 4

formula for variable-kVp Technique Chart

Answer 4

kVp = 2 X thickness of anatomy(cm) +30

Question 5

Once selected the kVp is fixed at that level for the type of examination and not varied according to different thicknesses of the anatomic part. The mAs, however, changed according to the thickness of the anatomic part to provide the proper density

Answer 5

Fixed-kVp Technique Chart

Question 6

The kVp selected for this chart is greater than 100. This type of exposure technique could be used for routine chest radiography to provide the various tissue mass densities present in the lung fields and mediastinum. It

Answer 6

High-kVp Technique Chart

Question 7

It is a computer-assisted automatic exposure system which uses an electronic exposure timer. T

Answer 7

Automatic-Exposure Technique Chart

Question 8

states that the x-ray intensity is inversely proportional to the square of the distance from the source of radiation

Answer 8

inverse square-law

Question 9

states that the mAs is directly proportional to the square of the distance from the source of radiation

Answer 9

mAs-Distance Relationship

Question 10

formula for inverse square-law

Answer 10

i1 / i2 = (D2)2 / (D1)2

Question 11

formula for mAs-Distance Relationship

Answer 11

mAs2 / mAs1 = (D2)2 / (D1)2