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Unit 1: Introduction and History of Computed Tomography verified/passed $11.49   Add to cart

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Unit 1: Introduction and History of Computed Tomography verified/passed

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  • Computered Tomography
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  • Computered Tomography

Unit 1: Introduction and History of Computed Tomography verified/passed

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  • August 9, 2024
  • 5
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • Computered Tomography
  • Computered Tomography
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BravelRadon
Unit 1: Introduction and History of
Computed Tomography

tomography - correct answer ✔✔derived from the Greek word tomos meaning section



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



bone shade color= - correct answer ✔✔white



soft tissue shade color= - correct answer ✔✔grey



air shade color= - correct answer ✔✔black



Hounsfield Unit (HU) - correct answer ✔✔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) - correct answer ✔✔2000 , (-1000 to 1,000)



Water's HU? - correct answer ✔✔0



Air's HU? - correct answer ✔✔-1,000



Bone HU? - correct answer ✔✔+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 - correct answer ✔✔Godfrey Newbold Hounsfield

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



CT Components - correct answer ✔✔1.High frequency Generator

2.X-ray Tube

3.Detectors

4.Photodiode

5.Filters

6.Collimators

7.Cooling system



High Frequency Generator - correct answer ✔✔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 - correct answer ✔✔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 - correct answer ✔✔*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 - correct answer ✔✔•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 - correct answer ✔✔-Mounted on the xray tube

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

-helps restrict and shape the beam

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