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Computed Tomography questions with correct answers respectively.
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Computed Tomography questions with correct answers respectively.
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Computed Tomography questions withcorrect answers respectively.
CT was developed in ANS - 1970s
Pioneer of CT and also Nobel Prize winner? ANS - Godfrey Hounsfield
A collimated x-ray beam is directed on the patient and it detected by a ANS - Solid state image receptor
3 possible Types of image planes shown on the CT monitors? ANS - Transverse, Sagittal, Coronal
Conventional Tomography is also called? and why? ANS - Axial Tomography: the plane of the image is
parallel with the long axis of the body
Type of image planes done with conventional tomography? ANS - Sagittal and coronal plane
Types of image planes done on CT? ANS - Transaxial (through Axial) and transverse
In CT, the internal structures of the body attenuate the x-ray according to ANS - mass density of tissues
and effective atomic number
Projection formation ANS - the detector makes a single sweep across the patient
Translation ANS - a single complete rotation of source-detector assembly
1st Generation CT ANS - Single Detector, A pencil beam x-ray, 5 min to image time
2nd Generation CT ANS - translate-rotate system, multiple detectors, a fan shaped X-ray beam, bow-tie
filter reduce and conform to patient's body, 30 seconds to image time
, 3rd Generation CT ANS - source-detector unit rotates around the patient, rotate only system, less than
1 second image time, curvilinear detector array for better image quality, ring artifacts caused by false
detector bank
4th Generation CT ANS - increased patient dose due to many detectors, rotate-stationary system, Slip-
Ring Technology, fixed circular detector with unto 4000 individual elements, varying slice thickness, no
ring artifacts
5th Generation CT ANS - Helical Scanner, increased speed, reduced patient dose, currently used system
CTDI ANS - CT Dose Index
CT System Components ANS - Computer, Gantry, Ops Console
CT Gantry Components ANS - X-ray Tube, Detector Arrays, Patient Support Couch, HV Generator, All
mechanical supports
System Component of the gantry ANS - Scintillation detector, gas detector, collimator, hv generator,
patient positioning and support couch
Scintillation Detector ANS - Measures glow or light
Gas Detector ANS - filled with O2 or Xenon.
Computer in CT system ANS - uses array processor for the image reconstruction, higher computing
power required for faster reconstruction of images
Reconstruction Time ANS - The time from the end of the x-ray imaging to the appearance of the actual
image on the CT screen
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