sp 2007 Flashcards
Which of the following refers to an attenuation of part of the beam by the grid?
grid cut-off
When using a stationary grid which of the following is recommended for spinal filming?
a 10:1 grid ratio
The use of a grid has which main effect on the patient?
it reduces x-ray exposure to the patient
The preferred focused grid range for spinal radiography is _____.
40” to 72”
If a film has an overall darkened gray appearance but visible structures the probable cause of the problem would be which of the following?
exposure of the film to scatter
When converting from a grid with a low ratio to a grid with a high ratio which of the following would be the best to do to maintain good film quality?
increase mAs
The higher the kVp the more ____ radiation is produced.
compton
Whats the most common cause of a blurry image in practice?
patient motion
Which choice below is the main reason why a “fixed kV” technique is preferred?
contrast is consistence
Whats the recommended optimal kV range for the different sections of the spine?
LC- 75-85 APT- 75-85 LT- 85-95 APL- 80-90 LL- 85-95 P- 75-85 FS- 80-100
Which of the following exposures would have the lowest contrast?
50 mAs with 110 kV
Which is preferred for spinal filming?
a fixed kV technique
What is an advantage of a high kVp technique?
lowered patient radiation dose
If you increase the mAs and reduce kV from a given radiographic technique what would be the outcome?
it’d have more contrast
Which of the following best describes what you should expect if you retake an AP lumbar film with 15% decrease in the kV and leave the mAs constant?
the density of the film would be reduced by 1/2
Which of the following would you do if you were going to use the 30% rule?
alter the mAs by 30%
If you were re-x-raying an obese patient because your first film was too light but you could see the osseous structure, which of the following would be best thing to do in order to get the best quality radiograph?
increase mAs
If a film was taken at 80 kVat 100 mA for 1/2 second and a second was taken at 80 kV at 5 mA for 1 second and a third time at 80 kV for 1/4 second, what would be the outcome?
they would all be the same
Picture this! you take a film and its too light. You want to retake it and double the density by using kVp. How would you do it?
increase the kV by 15%
Which effect would adding 100% more mAs to a radiographic technique have?
it would double the density of the film
Which would absorb the most X-rays in a patient?
their vertebra
Exceeding the optimal kV range while maintaining good density will yield a film that has which of the following?
a long scale contrast
Which of the following is most closely related to “differential absorption?
subject contrast
