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Comprehension Check & Review Ch 13.7 Questions with Solutions
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Comprehension Check & Review Ch 13.7
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Comprehension Check & Review Ch 13.71. Discuss why the term CT scan is correct and the term CAT scan outdated (p. 463). -
answer outdated CAT refers to computerized axial tomography
CT Scan: Axial images can be reconstructed and viewed in the sagittal and coronal
planes
2. Who were the two individuals most instrumental in the development of CT, and how
were they recognized (p. 464)? - answer In 1979, Hounsfield and Cormack shared the
Nobel Prize in Medicine for their historic work with CT imaging.
3. List the four component parts of a CT unit (p. 464). - answer A CT imaging system
has four component parts--a couch/table for patient support, a (doughnut-shaped)
gantry, a computer and operating consoles with display
4. List the seven components of the CT gantry (p. 466). - answer The CT gantry is
composed of the
x-ray tube
detector array
high voltage generator
collimator assembly
slip rings
DAS
Laser beams
5. What kind of technology allows continuous rotation of the CT x-ray tube and
simultaneous movement of the examination couch (p. 466, 469)? - answerSlip ring
technology allows continuous rotation of the x-ray tube (by elimination of cables) and
simultaneous couch movemen
6. Describe what is meant by the CT term pitch and how it is related to undersampling
and over-sampling (p. 466, 469). - answerPitch determines the amount of tissue
included in the scan
values less than 1.0 incicate oversampling
7. What is meant by CT translation time (p. 467)? - answerThe time taken fo the xray
tube and two detectors to travel one side of the part to the other
8. What is the shape of the CT x-ray beam (p. 469)? - answerhelical spiral shape
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