If an optimal radiograph is acquired at 72 inches with an air kerma of 4 mGy, what will the air kerma be if the distance is reduced to 40 inches?

According to the inverse square law, when the distance between the x-ray source and the point of measurement (patient, worker, or receptor) increases, the beam quantity will:

If the same exposure factors are used on four different radiographs and all that is changed is the SID, which radiograph would have the greatest IR exposure? The one taken at a:

Shape distortion always results in a loss of image quality and should therefore be avoided.

Which of the following projections of the skull would result in elongation of the anatomy being imaged?

Technical factors that are considered “geometric” include                           1. focal spot selection                           2. SID                           3. grid ratio                           4. filtration thickness                           5. OID                           6. tube angulation                           7. part thickness                           8. receptor resolution

A radiograph acquired at 60 kilovoltage peak (kVp) results in an underexposed image. What new kVp setting will double the receptor exposure?

Scattered radiation that hits the image receptor produces:

A satisfactory x-ray of the wrist is produced using a technique of 300 milliamperes (mA), 15 milliseconds, 50 kilovoltage peak (kVp), and a source-to-image distance (SID) of 40 inches. How should the mA be changed if the exposure time is decreased to 10 milliseconds?

If the same exposure factors are used on four different radiographs and all that is changed is the SID, which radiograph would have the greatest IR exposure? The one taken at a: