Exam (elaborations)
Basic principles of CT Questions and Answers 2024
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Basic principles of CT
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Basic principles of CTHow does CT work? - answerX-ray tube moves in a 360-degree arch around the patient
and detectors will detect the amount of radiation absorbed and reconstruct an image
The computer will create sequential images
What are the advantages of CT? - answer No superimposition
Finer detail
Iodine based contrast
Fast
Readily available
Claustrophobic
Disadvantages of CT? - answer High dose
Allergies to contrast
Nephrotoxic effects- kidneys
Cost- expensive.;
What are the contents of the CT gantry? - answerX-ray tube
Filtration
Collimators
Slip rings
Detectors
DAS- data acquisition system
Table and aperture.
how is CT different from x-ray? - answerNeeds to have a higher output than normal x-
ray.
Needs higher speed
High anode heat capacity
High heat dissipation
Withstand high mechanical stress
Withstand high temps and extreme changes.
What is a bow-tie filter? - answerMinimises surface dose to patient, improves beam
quality.
What are active collimators? - answerclose colliamtion on beam at start and end to try
and reduce dose./
What are slip rings? - answerallows the gantry to rotate continuously
What is the pitch? - answerDistance the couch travels/ width of the slice.
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