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Unit 1 Introduction and History of Computed Tomography Questions with correct answers respectively.
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Unit 1 Introduction and History of Computed Tomography Questions with correct answers respectively.

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  • August 4, 2024
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  • 2024/2025
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  • unit 1 introduction and history of computed tomogr

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Unit 1 Introduction and History of
Computed Tomography Questions with
correct answers respectively.

tomography ANS - derived from the Greek word tomos meaning section



In 1937, transverse axial tomography was the term used to refer to the ANS - imaging ability of cross-
sectional images to be acquired



bone shade color= ANS - white



soft tissue shade color= ANS - grey



air shade color= ANS - black



Hounsfield Unit (HU) ANS - represents the attenuating properties or density of each tissue



The number is the Hounsfield number or CT number and has a range of _________. ( The number
identifies the structure it passed trough) ANS - 2000 , (-1000 to 1,000)



Water's HU? ANS - 0



Air's HU? ANS - -1,000



Bone HU? ANS - +1,000



•His research resulted in the first clinically useful CT scanner for imaging the brain when in 1972 the first
patient was scanned by his machine ANS - Godfrey Newbold Hounsfield

, University medical physicist that developed the mathematical solutions to reconstruct images in
Computed tomography ANS - Allan MacLeod Cormack



CT Components ANS - 1.High frequency Generator

2.X-ray Tube

3.Detectors

4.Photodiode

5.Filters

6.Collimators

7.Cooling system



High Frequency Generator ANS - located in the gantry and produce the high voltage supply to the x-ray
tube. The power capacity of the generator is listed in Kilowatts (kW). In short it supplies the kV to the
tube with a max. of 120-140 kVp, which allows for lower mA settings and lower heat load to x-ray tube.



Filtration ANS - Compensating filtration filters are used to reduce the patient radiation dose by
removing lower energy x-rays (soft x-rays) and harden the beam



Bow tie filters ANS - *compensate for uneven filtration

reduce scatter

reduce noise

*reduce the beam intensity at the periphery of the patient body where the anatomy is less dense.



Collimation ANS - •restricts the beam to improve image quality by reducing scatter as in routine x-ray.
Often two types of collimation are used: Pre-patient (source) and Post-patient collimation. Pre-patient
collimation takes place at the x-ray source and helps to restrict and shape the beam. Post collimation
works like a grid to remove scatter from the patient before it reaches the detector.



Pre-patient collimaton ANS - -Mounted on the xray tube

-Limits the area of the patient that intercepts the useful beam.

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