sp 2008 Flashcards
If you foolishly did not use a grid for an AP lumbar film and adjusted the radiographic technique to maintain good density what would be the outcome?
the film would be very grey
If you wanted to alter your contrast so that a radiograph had more gray tones, what would you have to increase?
kV
Determine which radiographic technique would yield a longest scale of contrast.
95 kV with 10 mAs
To double the density of a film by using mAs, what would you do?
increase mAs by 100%
If you had a film that was under-exposed but you could see the image, which of the following would improve your film?
decrease mAs 50%
How much increase in mAs is needed to maintain the same density when reducing the X-ray field from 14x17 to 8x10?
60%
If you wanted to decrease the density of a film, which of the following would be the best way to do it?
reduce the mA
Which of the following best describes the outcome of reducing the mAs by one half and keeping the kV and the distance constant?
the film density would be decreased
Which of the following would produce the same film density as ‘200 mA for 0.5 sec?
100 mA for 1 second
If you took a retake and reduced the kVp by 15% and increased the mAs by adding 30% how would the second film look compared to the first?
second film would be lighter than the first
Generally speaking, adding 4 kVp to a radiographic technique with a single phase machine would be the equivalent to what?
increase mAs by 50%
To what does the 15% rule apply?
kV
Lets say that you took an AP thoracic film with 70 kV and 50 mAs and it came out underexposed but you could see all the structures what you wanted, which choice would be the best to do?
increase kV by 15%
As a general rule, if you are going to X-ray an elderly patient, you should do which if the following to your established radiographic technique?
decrease it
What is the main reason why fixed kV techniques are preferred?
contrast is constant
Which of the flowing could be a problem if your X-ray tube was laterally shifted from the center of the film?
shape distortion
Of the following which would produce a film with the most visible grain?
highkVp/ low mAs film
What is undesirable with magnification distortion?
the borders if the object will be blurred
Which. of the following effects does using a high kV technique have?
produces more scatter
The rays that exit the patient and hit the film are termed what?
remnant rays
Which is true about air-gap technique when normally used in a cervical spine series?
it usually doesn’t require the use of a grid
When going from a grid to a non-grid technique on the same body part with the same FFP, kVp, and mAs would cause which of the following?
the film would be darker
A film that is lighter on one side than the other most likely would indicate _____.
grid cut off
What type of grid is best for your office?
stationary focused grid
What type of cross-hatched grid do you want to get?
the one with aluminum between the lead strips
