A technique of 10 mAs at 78 kVp is used at a 140 cm (56”) SID. What new SID should be used to decrease the exposure to 5 mAs at 78 kVp?

Assume that the usual exposure time for an AP lumbar spine is 3/4 second at 40 inches.  If you needed to use a shorter time of 3/10 second due to the condition of the patient, all other factors constant, the correct SID is:

Extremely low mAs could result in all of the following except:

Utilizing an x-ray tube with a large anode angle compared to a tube with a small angle and the same size actual focal spot results in:

Focal spot blur can be reduced by using __________.

Which of the chest radiographs would probably have the highest contrast?

All other factors equal, when mAs is reduced, the photoelectric/Compton ratio will:

Calculate the new time required to maintain the same IR exposure produced with the original values.

Determine the missing factor that will produce the same exposure as the original set of exposure factors:50 mA                       200 mA1 sec.                       ____ sec.40″ SID         to          25″ SID80 kVp                       69 kVp

When using a focused moving grid and where the lateral edges of the image have lower exposure (are brighter), it is an indication that the: