DMI 21 Q wed. 9/18 Flashcards
Most important steps in a production of a radiograph
•make sure you have the right patient
When u set a technique the last thing you should set is..
- kVp
- cuz if u set your kVp first then mAs your kVp might change
- but state kVp first
Densitometer
•used to measure optical density of exposed film
Difference in black & white in adjacent structures
•Contrast
Tissue type density WHITE
•bone
Tissue type density LIGHT GRAY
•fluid
Tissue type density GRAY
•muscle
Tissue type density DARK GRAY
•fat
Tissue type density BLACK
•air
High kVp
- low contrast
- long gray scale
- many shades of gray
Low kVp
- high contrast
* short gray scale few grays (black & white)
Quality control
•monitoring & maintenance of equipment
Quality assurance
•enhancement of patient care monitors people within the department
Sensitometric strip is used
- once a day at the beginning of the day
* must wait till processor is up to temp first
•sprung improperly position crossover/turn around assembly
•guide shoe marks
Chemistry that is not properly squeezed from the film & runs down
•curtain effect
Pi lines
•lines 3.14” apart on film
Random narrow bands usually on leading edge of first film. Caused by build up of oxidize developer on crossover or when solutions are slow.
•Delay streak
Light fog
- storage artifact
* improper safelight or light leak
Density bands about 1/8” wide from excessive pressure of entrance roller
•Entrance roller marks
Radiation fog
•scatter/secondary radiation from room
Consistently spaced densities from to loose or to tight developer drive mechanism.
•chatter
Slap marks
•broad density about 2” from trailing edge of film
