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NMTCB-CT Exam Questions With Correct Answers

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NMTCB-CT Exam Questions With Correct Answers Where are x-rays made? - answerin the electron shell structure of an atom What is Bremsstrahlung radiation? - answerenergetic electrons pass very near the nucleus of an atom. The strong forces of th positive charged atom causes the negatively charged...

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  • October 18, 2024
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  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • NMTCB
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©SIRJOEL EXAM SOLUTIONS
12/3/2024 11:27AM



NMTCB-CT Exam 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

, ©SIRJOEL EXAM SOLUTIONS
12/3/2024 11:27AM


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


Pitch - answer✔the ratio of patient's movements through the gantry during one 360 degree beam

rotation relative to the beam collimation (in single slice CT)




The table distance traveled in 1 gantry rotation of 360o divided by the total thickness of all

acquired slices—in multi detector CT


How is pitch calculated? - answer✔pitch = table movement per rotation (mm)/ (number of

slices)(slices width in mm)


What happens when pitch is decreased? - answer✔--the number of views per linear scan distance

increases,

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