sp 2006 Flashcards
To double the density of a film by using mAs, what would you do?
increase the mAs by 100%
T/F. A reciprocating grid is thicker than a stationary grid?
T
When converting from a grid with a low ratio to a grid with a high ratio, how to do maintain good film quality?
increase the mAs
Which type of grid is recommended for spinal radiography in the usual chiropractic office?
focused grid
What effect on scatter does using a high kV technique have?
produces more scatter
What is the preferred focused grid range for spinal radiography?
40” to 72”
If a film has an overall darkened gray appearance but visible structures, what is the probable cause of the problem?
exposure of the film to scatter
The term “optimal kV” refers to what?
the lowest possible mAs with acceptable contrast on the film
How many lines per inch are recommended for a stationary grid?
100-103
Diminished penetration at the periphery of a grid is termed what?
grid cut-off
If a film is said to be “burned out” what would it look like?
too dark
What is the main reason why a “fixed kV technique is preferred”?
contrast is consistent
Primary AND scattered rays that leave the patient and reach the grid is termed what?
remnant radiation
T/F. A moving grid would produce the least amount of grid lines?
T
Exceeding the optimal kV range while maintaining good density will yield a film with what type of contrast?
long scale contrast
As a general rule, if you are going to x-ray an elderly patient, how should you adjust your radiographic technique?
decrease that shit
Using a 10:1 stationary grid would have what effect on patient exposure?
increase it
If you took a lateral cervical with 66 kV at 100 mAs for 1/10 of a second at 72” FFD and it was too light but you could see the structures, how would you adjust your retake to solve the problem?
increase kV by 15%
About how much increase in mAs is required when going from a non-grid technique to a technique with a 12:1 grid?
increase mAs by 5x
If you took a 14”x17” lateral lumbar film and saw that the L5-S1 area was too light, what would be the best thing to do for the retake?
take a spot 8”x10” lateral, increase the mAs by 60% and increase the kV
If you saw a blood vessel on end (axially) on a chest film it would probably look like which would of the 4 natural body (subject) densities?
metal…wtf mate
If you saw 2 structures each with paralleling tracks of calcification overlying the articular pillars diverging at the superior and close at the inferior, what would you be looking at?
part of the thyroid cartilage you dumb fuck
If you took an A-P lumbar on a thin patient using 85 kV at 100 mAs with the exposure time of 1/2 second, and the film demonstrated all of the structures but was too light…what should you do?
increase the mAs by doubling it
You first take an A-P lumbar film using 90 kV with 100 mAs for 1 second at 40” SID. When you look at the film you see it is very gray and you are going to retake it…what should you do?
use 200 mAs and decrease the kV by 15%
You take a lateral cervical film at 65 kV and 10 mAs without a grid, it is light but you can see the structures…what should you do?
increase the kV by 15%
