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Computed Tomography- Test 1 with verified answers
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Computed Tomography- Test 1Tomos- - correct answer ✔✔Greek word meaning: section
Initially known as - correct answer ✔✔Computer Assisted Tomography
Evolved to - correct answer ✔✔Computerized Axial Tomography
Currently, Computed tomography is used since CT images are available in: - correct answer ✔✔sagittal,
coronal, and axial planes (horizontal)
Dr. Godfrey Houndsfield - correct answer ✔✔invented the first computed tomography
1971 The EMI Mark 1 - correct answer ✔✔(CT brain scanner prototype) was installed at Atkinson-
Morley's Hospital under the direction of radiologist, Dr. James Ambrose.
1972 - correct answer ✔✔A woman with a suspected brain lesion was the first patient scanned. The
scanner confirmed the presence of the lesion.
Allan Cormack - correct answer ✔✔Physics Professor at Tufts University, developed the mathematics
used to reconstruct CT images (algorithms)
Houndsfield & Cormack - correct answer ✔✔shared the Nobel Prize in Medicine in 1979 for their
contributions to CT
Dr. Robert Ledley - correct answer ✔✔Professor of radiology, physiology, & biophysics at Georgetown
University, developed the first whole body scanner.
Data Acquisitions - correct answer ✔✔refers to the method by which a patient is scanned and the data is
used for image reconstruction
, Type of scanning depends on the: - correct answer ✔✔beam geometry (shape of the radiation beam)
which is based on the specific CT machine and components that are used.
3 types of acquisition geometries - correct answer ✔✔1. parallel beam
2. fan beam
3. spiral beam
2 elements in a basic scheme for data acquisition are: - correct answer ✔✔beam geometry &
components
Beam Geometry: - correct answer ✔✔refers to the shape, size, and motion of the beam and its path.
Components: - correct answer ✔✔refer to the physical devices that shape or define the beam, measure
its transmission through the patient, and convert the analog data into digital data for input into the
computer.
First Generation - correct answer ✔✔-translate and rotate motion type (beam geometry- shape, size,
motion of beam)
-utilized a parallel (pencil thin) x-ray beam with 1 linear detector
-data acquisition process: 1 beam and 1 detector first translates (makes 1 sweep) across the patient to
collect readings. After 1 translation, the tube & detector rotate 1 degree and repeat the process until 180
translations have been achieved.
-disadvantage: exposure time required 5 min for 1 slice (mm)
-Head CT capability only
Second Generation - correct answer ✔✔-translate and rotate motion type
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