What percentage of x-ray attenuation does a 0.5-mm lead equivalent apron at 75 kV provide?

What percentage of x-ray attenuation does a 0.5-mm lead equivalent apron at 75 kV provide?

Which of the following is the most likely site for a lumbar puncture?  

Which of the following is most likely to occur as a result of using a 30-inch SID with a 14 x 17 inches IR to image a fairly homogeneous structure  

Esophageal varices are best demonstrated in which of the following positions

Differences between body habitus types are likely to affect all of the following, except  

Brightness and contrast resolution in digital imaging can be influenced by1.    Window level (WL)2.    Window width (WW)3.    Lookup table (LUT)  

Which of the following is the most likely site for a lumbar puncture?  

Which of the following procedures may be used to better demonstrate the interphalangeal joints of the toes?1.    Angle the CR 15° caudad2.    Angle the CR 15° cephalad3.    Place a sponge wedge under the foot with the toes elevated 15°

Which of the x-ray circuit devices shown in the figure below requires alternating current for effective operation?1.    Number 12.    Number 23.    Number 7