Exam (elaborations)
History Computed Tomography Questions and Answers 2024
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History Computed Tomography
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History Computed TomographyWhen was the first CT system commercially marketed for clinical use? - answer1973
1950s - answer components necessary to construct a CT imaging system were already
available to medical physicists.
1970 - answer Godfrey Hounsfield first demonstrated the CT technique, while employed
by EMI. Ltd.
1)Hounsfield and Cormack given credit for development of CT
1979 - answer Alan Cormack shared the Nobel Prize in Physics with Hounsfield
Conventional Radiography - answer Image is created directly on the screen-film
receptor
Image is low in contrast due to scatter radiation
Degraded quality because of superimposition of all the anatomic structures within the
area of interest.
Axial Tomography - answerAllows the superimposition structure to be blurred and thus
leaving the area of interest in maximum focus
Computed Tomography - answerProvides a transaxial or transverse image, versus
sagittal and coronal in conventional tomography.
Employs a precise methodology based on complex physics, engineering, and computer
concepts.
Basic Principle of CT - answerA finely-collimated x-ray beam is used (Pencil Beam).
X-ray source and detector move synchronously.
Source-detector assembly makes one sweep, or translation, across the patient.
First Generation CT Scanner - answer- Finely collimated x-ray beam
- Successive translations across the patient
- Required 180 translations in 1-degree increments
- Two detectors enable splitting of the beam to image 2 contiguous slices during each
procedure.
- One image took 5 minutes to complete.
Second Generation - answer-Fan-shaped beam
Caused increased radiation intensity that occurs toward the edges of the beam because
of body shape.
Corrected with the use of a "bow tie" filter.
-Translate-rotate
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