Week 7 - Technique Charts
Guidance Exam Questions and Answers
What is a technique chart and how is it used in radiography? - Answer- A
technique chart provides suggested exposure factors to use based on the anatomic
part being radiographed, thickness of tissue, and position of patient.
Provides the technician with predetermined exposure settings for various
radiographs to be taken in order to receive an image of good diagnostic quality.
What is Santes' rule? How does it apply to producing a radiograph and what is the
formula? - Answer- A mathematical equation used to estimate the amount of kVp
needed to produce a quality diagnostic image.
(2 x thickness of tissue in cm) + SID = Grid factor = kVp
Using Santes' rule, calculate the kVp using the following information
Thickness of area: 11 cm
Grid factor: 12
SID = 40 - Answer- kVp = 74
How is a technique chart created? - Answer- Start with exposure factors that
produced the diagnostic film.
2 kVp is subtracted for each cm decrease from the original measurement and 2 kVp
is added to the original kVp for each dm increase up to 80 kVp. 3 kVp is added for
each cm increase up to 100 kVp and 4 kVp is added for each cm increase up to 125
kVp.
What factors will influence the technique chart? - Answer- Grid type of cassette /
Intensifying screen / Type of x-ray film / Film Focal distance / Standardized dark
room procedures
What type of patient should be used for creating a technique chart? Describe the
physical characteristics - Answer- Adult dog of moderate size and muscling /
Average weight (50) / Clean coat with medium to short length / Lateral Recumbency
Any body part exceeding this measurement requires the use of a grid to reduce fog-
producing scatter radiation - Answer- 10 cm
If an initial radiograph is too light, how should the kVp and mAs be adjusted? -
Answer- kVp increase by 15% / mAs stays the same
Guidance Exam Questions and Answers
What is a technique chart and how is it used in radiography? - Answer- A
technique chart provides suggested exposure factors to use based on the anatomic
part being radiographed, thickness of tissue, and position of patient.
Provides the technician with predetermined exposure settings for various
radiographs to be taken in order to receive an image of good diagnostic quality.
What is Santes' rule? How does it apply to producing a radiograph and what is the
formula? - Answer- A mathematical equation used to estimate the amount of kVp
needed to produce a quality diagnostic image.
(2 x thickness of tissue in cm) + SID = Grid factor = kVp
Using Santes' rule, calculate the kVp using the following information
Thickness of area: 11 cm
Grid factor: 12
SID = 40 - Answer- kVp = 74
How is a technique chart created? - Answer- Start with exposure factors that
produced the diagnostic film.
2 kVp is subtracted for each cm decrease from the original measurement and 2 kVp
is added to the original kVp for each dm increase up to 80 kVp. 3 kVp is added for
each cm increase up to 100 kVp and 4 kVp is added for each cm increase up to 125
kVp.
What factors will influence the technique chart? - Answer- Grid type of cassette /
Intensifying screen / Type of x-ray film / Film Focal distance / Standardized dark
room procedures
What type of patient should be used for creating a technique chart? Describe the
physical characteristics - Answer- Adult dog of moderate size and muscling /
Average weight (50) / Clean coat with medium to short length / Lateral Recumbency
Any body part exceeding this measurement requires the use of a grid to reduce fog-
producing scatter radiation - Answer- 10 cm
If an initial radiograph is too light, how should the kVp and mAs be adjusted? -
Answer- kVp increase by 15% / mAs stays the same
