Film Factors

Question 1

The study of the relationship between the intensity of exposure of the film and “the blackness after processing” is called

Answer 1

Sensitometry

Question 2

Film Factors is consists of

Answer 2

Speed
Contrast
Density
Latitude
Processing temperature
Processing time

Question 3

The “two principal measurements” involved in sensitometry are the___________and___________

Answer 3

-exposure to the film
-Percentage of light transmitted through the process film

Question 4

Types of characteristics curve

Answer 4

H&D curve
Hurter and Driffield

Question 5

It describe the relationship between OD and radiation exposure

Answer 5

Characteristic curve

Question 6

-low radiation exposure level

Answer 6

Toe

Question 7

-intermediate radiation exposure level
-the region in which properly exposed radiograph appears

Answer 7

Straight line portion

Question 8

-high radiation exposure level

Answer 8

Shoulder

Question 9

Apparatus that are needed to construct a characteristic curve

Answer 9

Optical step wedge/sensitometer
Densitometer - a device that measures OD

Question 10

Steps involved in the construction of a characteristic curve

Answer 10

Exposure the film
Process the film
Analyze the film
Record and plot data

Question 11

The degree of blackening on the radiograph
-has a precise numeric value

Answer 11

Optical Density

Question 12

Attributable to the composition of the base and the tint added to the base to make the radiograph more pleasing to the eye.
-has a value of approximately 0.1

Answer 12

Base Density

Question 13

Results from “inadvertent exposure of film during storage”, undersirable chemical contamination, improper processing, and a number of other influences
- on a processed radiograph should not exceed 0.1

Answer 13

Fog density

Question 14

States that the “OD on a radiograph is proportional only to the total energy imparted to the radiographic film” and independent of the time of exposure

Answer 14

Reciprocity Law

Question 15

Is inherent in the screen-film combination and is “influenced somewhat by processing of the film”.

Answer 15

Image receptor contrast

Question 16

Is “determined by the sized, shape, and x-ray attenuating characteristics of the anatomy” that is being examined and the energy (kVp) of the x-ray beam

Answer 16

Subject Contrast

Question 17

Is probably “more important than average gradient for general radiography” because many clinical ODs appear in the toe region of the characteristic curve

Answer 17

Toe gradient

Question 18

Is more important for mammography

Answer 18

Midgradient or shouldrr gradient

Question 19

Refers to the “range of exposures” over which the image receptor responds with ODs in the diagnostically useful range.

Answer 19

Latitude

Question 20

Latitude and contrast are

Answer 20

Inversely proportional

Question 21

Development time is______ and the IR speed and Fog is_______, IR contrast is

Answer 21

High, high, low

Question 22

Development Temp is ______, IR speed is________ and fog is __________

Answer 22

High, high, High

Question 23

Is “related to the slope of the straight line portion” of the characteristic curve

Answer 23

Film contrast

Question 24

Wide latitude have

Answer 24

Long gray scale
Low contrast

Question 25

Narrow latitude have

Answer 25

Short gray scale
High contrast

Question 26

Fast/high speed IR

Answer 26

More than 100

Question 27

Par speed

Answer 27

100