Distance and Radiograph Quality Flashcards
1
Q
Compensation
A
Change in distance= change in mAs
2
Q
Formula for compensation
A
Old mAs x (new SID^2/ Old SID^2) = New mAs
3
Q
Consistency
A
SID should stay the same
(90-100 cm)
4
Q
Why would you want to decrease SID
A
To increase penetration for dense patients
5
Q
What is high verses low contrast
A
High Contrast: Black and White
Low Contrast: Lots of shades of gray
6
Q
What are 3 Factors that affect Radiographic Quality?
A
- Radiographic Density
- Radiographic Contrast
- Geometric Factors
7
Q
What are some of the Geometric factors that affect Radiographic Quality?
A
- Focal Spot Size
- Motion
- SID
- OFD (Object to film distance)
- Distortion
8
Q
Three types of distortion
A
- Elongation
- Magnification
- Foreshortening
9
Q
Density of the Radiograph
A
Degree of blackness
10
Q
What affects density of the Radiograph’
A
Number of x rays reaching the film
