Introduction to Computed Tomography
Questions with Accurate Answers
1st generation scan, correct answer translate/rotate.
scans only the head,
pencil beam
2nd generation scan correct answer fan beam, more detectors, for whole body
scanning
3D Applications correct answer Orthopedics,
Planning for craniofacial surgery,
Planning for neurosurgery,
Planning for radiation therapy treatment
3rd generation scan , rotate, rotate , correct answer all modern scanners are
derive from this generation
4th generation scan correct answer only x ray tube moves around the patient, the
detector is stationary
5th generation scan (heart only) correct answer EBT, or Electron Beam
Tomography, for Cardiac Scanning only
6th generation (spiral) correct answer Continuous rotation scanners, Slip rings
allow for continuous rotation of x-ray tube
, 7th Generation Scanners or Multislice C.T correct answer also called Volumetric
scanners,
with Multiple parallel detector arrays
-Single slice, 4 up to 64 slices
Advantages of CT correct answer more clinical data, faster cross-sectional
imaging, removes superimposition of objects,
better contrast resolution, can post process, store and transfer images,
rapid diagnosis for trauma patients, fast enough to image the heart and blood
vessels
Array Processor correct answer Specialized peripheral computer used in
reconstructing images,
Performs mathematical functions simultaneously instead of sequentially
as attenuation coefficient decreases (absorption ) correct answer darker pixels
and lower HU value (Hounsfield units)
as attenuation coefficient increases (Absorption) correct answer lighter pixels and
higher HU Value
(Hounsfield units)
Questions with Accurate Answers
1st generation scan, correct answer translate/rotate.
scans only the head,
pencil beam
2nd generation scan correct answer fan beam, more detectors, for whole body
scanning
3D Applications correct answer Orthopedics,
Planning for craniofacial surgery,
Planning for neurosurgery,
Planning for radiation therapy treatment
3rd generation scan , rotate, rotate , correct answer all modern scanners are
derive from this generation
4th generation scan correct answer only x ray tube moves around the patient, the
detector is stationary
5th generation scan (heart only) correct answer EBT, or Electron Beam
Tomography, for Cardiac Scanning only
6th generation (spiral) correct answer Continuous rotation scanners, Slip rings
allow for continuous rotation of x-ray tube
, 7th Generation Scanners or Multislice C.T correct answer also called Volumetric
scanners,
with Multiple parallel detector arrays
-Single slice, 4 up to 64 slices
Advantages of CT correct answer more clinical data, faster cross-sectional
imaging, removes superimposition of objects,
better contrast resolution, can post process, store and transfer images,
rapid diagnosis for trauma patients, fast enough to image the heart and blood
vessels
Array Processor correct answer Specialized peripheral computer used in
reconstructing images,
Performs mathematical functions simultaneously instead of sequentially
as attenuation coefficient decreases (absorption ) correct answer darker pixels
and lower HU value (Hounsfield units)
as attenuation coefficient increases (Absorption) correct answer lighter pixels and
higher HU Value
(Hounsfield units)
