Computed Tomography
CT was developed in - correct answer ✔✔1970s
Pioneer of CT and also Nobel Prize winner? - correct answer ✔✔Godfrey Hounsfield
A collimated x-ray beam is directed on the patient and it detected by a - correct answer ✔✔Solid state
image receptor
3 possible Types of image planes shown on the CT monitors? - correct answer ✔✔Transverse, Sagittal,
Coronal
Conventional Tomography is also called? and why? - correct answer ✔✔Axial Tomography: the plane of
the image is parallel with the long axis of the body
Type of image planes done with conventional tomography? - correct answer ✔✔Sagittal and coronal
plane
Types of image planes done on CT? - correct answer ✔✔Transaxial (through Axial) and transverse
In CT, the internal structures of the body attenuate the x-ray according to - correct answer ✔✔mass
density of tissues and effective atomic number
Projection formation - correct answer ✔✔the detector makes a single sweep across the patient
Translation - correct answer ✔✔a single complete rotation of source-detector assembly
1st Generation CT - correct answer ✔✔Single Detector, A pencil beam x-ray, 5 min to image time
, 2nd Generation CT - correct answer ✔✔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 - correct answer ✔✔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 - correct answer ✔✔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 - correct answer ✔✔Helical Scanner, increased speed, reduced patient dose, currently
used system
CTDI - correct answer ✔✔CT Dose Index
CT System Components - correct answer ✔✔Computer, Gantry, Ops Console
CT Gantry Components - correct answer ✔✔X-ray Tube, Detector Arrays, Patient Support Couch, HV
Generator, All mechanical supports
System Component of the gantry - correct answer ✔✔Scintillation detector, gas detector, collimator, hv
generator, patient positioning and support couch
Scintillation Detector - correct answer ✔✔Measures glow or light
Gas Detector - correct answer ✔✔filled with O2 or Xenon.
Computer in CT system - correct answer ✔✔uses array processor for the image reconstruction, higher
computing power required for faster reconstruction of images
CT was developed in - correct answer ✔✔1970s
Pioneer of CT and also Nobel Prize winner? - correct answer ✔✔Godfrey Hounsfield
A collimated x-ray beam is directed on the patient and it detected by a - correct answer ✔✔Solid state
image receptor
3 possible Types of image planes shown on the CT monitors? - correct answer ✔✔Transverse, Sagittal,
Coronal
Conventional Tomography is also called? and why? - correct answer ✔✔Axial Tomography: the plane of
the image is parallel with the long axis of the body
Type of image planes done with conventional tomography? - correct answer ✔✔Sagittal and coronal
plane
Types of image planes done on CT? - correct answer ✔✔Transaxial (through Axial) and transverse
In CT, the internal structures of the body attenuate the x-ray according to - correct answer ✔✔mass
density of tissues and effective atomic number
Projection formation - correct answer ✔✔the detector makes a single sweep across the patient
Translation - correct answer ✔✔a single complete rotation of source-detector assembly
1st Generation CT - correct answer ✔✔Single Detector, A pencil beam x-ray, 5 min to image time
, 2nd Generation CT - correct answer ✔✔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 - correct answer ✔✔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 - correct answer ✔✔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 - correct answer ✔✔Helical Scanner, increased speed, reduced patient dose, currently
used system
CTDI - correct answer ✔✔CT Dose Index
CT System Components - correct answer ✔✔Computer, Gantry, Ops Console
CT Gantry Components - correct answer ✔✔X-ray Tube, Detector Arrays, Patient Support Couch, HV
Generator, All mechanical supports
System Component of the gantry - correct answer ✔✔Scintillation detector, gas detector, collimator, hv
generator, patient positioning and support couch
Scintillation Detector - correct answer ✔✔Measures glow or light
Gas Detector - correct answer ✔✔filled with O2 or Xenon.
Computer in CT system - correct answer ✔✔uses array processor for the image reconstruction, higher
computing power required for faster reconstruction of images
