NMTCB-CT Test Questions with Correct Answers

NMTCB-CT Test Questions with Correct Answers Where are x-rays made? - Answer-in the electron shell structure of an atom What is Bremsstrahlung radiation? - Answer-energetic electrons pass very near the nucleus of an atom. The strong forces of th positive charged atom causes the negatively charged electron to decelerate; the path of the electron is changed, and some of the kinetic energy of the electron is lost, and converted into x-rays what is characteristic x-ray radiation? - Answer-following the ionization of an atom that leaves an inner shell, outer shell electrons drop down to refill the inner shell. As these electrons drop down, they lose energy, which is released as x-rays. What does pre-collimation do? - Answer-(used before x-rays enter the patient) defines the beam shape and width (which is usually fan or cone shaped) and protects the patient from excess radiation What does post-collimation do? - Answer-(used to reduce scatter after leaving the patient) is used before the radiation strikes the detectors What are advantages of thinner collimation? - Answer-A: less volume averaging B: increased spatial resolution C: decreased spatial resolution D: fewer artifacts E: all of the above F: a,b,d ** True or false: in CT, the gantry rotates continuously in one direction on a slip ring system - Answer-true What is a scout imaged used for? - Answer-Positioning /localization