Which of the following statements about dental radiographic exposure variables is true?
a. Increasing the mA darkens the radiograph.
b. Decreasing exposure time darkens the radiograph.
c. Exposure time is difficult to change on most machines.
d. Milliamperage affects radiographic contrast.
a. The mA setting determines the quantity (number) of x-rays produced. Increasing the mA darkens the image, while decreasing the mA lightens the image. Exposure time also determines the quantity of x-rays produced, so increasing exposure time darkens the radiograph, while decreasing the exposure time lightens it. Exposure time is the easiest exposure control to change. kVp primarily influences image contrast.
You might also like to view...
The gastrointestinal mucosa produces ________
a. secretin b. cholecystokinin c. gastrin d. all of the above
Which of the following is NOT one of the more general exceptions to the informed consent doctrine that states that a physician does not have to inform a patient?
a. When the doctor decides it is not necessary b. When the patient asks the physician not to disclose the risk c. When disclosure of risks may be detrimental to the patient d. When risks are commonly known
____ is an inherited auto-immune disorder.
A. Folliculitis B. Psoriasis C. Scabies D. Dermatitis
A problem with street drugs is that the user doesn't know the toxicity risk until the drug has been used
a. true b. false