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CT - Chapter 1 - Intro to CT by Seeram questions with 100% correct answers.
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CT - Chapter 1 - Intro to CT by Seeramquestions with 100% correct answers.
What is a specialized x-ray procedure that involves the measurement of x-ray attenuation passing
through a given part of human anatomy called? ANS - Computed Tomography (CT)
What measures the non-absorbed x-rays that pass through anatomical structure and send this
information to a computer for reconstruction called? ANS - Radiation Detectors
What involves using mathematical equations (algorithms) to create an image of a specific section of the
body for display on a cathode ray tube (CRT) called? ANS - Reconstruction
How does Computed Tomography differ from conventional radiography? ANS - The resulting images are
cross-sections, rather than superimposition of tissues.
In conentional radiography, the ____ and ____ of the patient is a factor in determining how much of the
x-ray beam is absorbed (attenuated) by the patient and how much passes through the patient. ANS -
composition and size
The formation of CT images by a CT scanner involves what 3 major steps? ANS - 1. Data Acquisition, 2.
Image Reconstruction, and 3. Image Display, Manipulation, Storage and Communication
What involves the collection of x-ray transmission measurements from the patient?
-- Once x-rays have passed through the patient, the attenuated rays fall onto special detectors that
measure the transmission or attenuation values. ANS - Data Acquisition
What are a collection of all the signals obtained from all the detectors at a given position of the x-ray
tube and detector unit within the CT scanner? ANS - Attenuation profiles
With data acquistion and attenuation profiles, the information is then turned into electrical signals that
are sent to the computer as ___ ____ for processing. ANS - Raw data
, with image reconstruction, before the raw data can be used by the computer, the electrical signals must
be converted into ___ (___) data for input into the computer. ANS - Digital (numerical)
The computer uses a mathematical calculation called ___ ___ to reconstruct the CT image. ANS - Back
Projection
The reconstructed image is in ____ form and must be converted back to ____ _____ for analog viewing
on the television monitor. ANS - Numeric, electrical signals
With image display, ___ ___ images are created from the digital data. ANS - Gray scale
What is it called when images can be modified by the technologist through image manipulation to make
them more useful for the physician/ radiologist. (Ex. transverse images can be reformatted into coronal
or sagittal sections). ANS - Multiplanar Reconstruction
The CT image is composed of a range of CT numbers ( ___ to ___ for a total of ____ ) that represent
varying shades of gray. ANS - -1000 to +1000 for a total of 2000
The process of changing the CT image gray scale is termed ___. ANS - Windowing
What is one of the major motivating factors for the development of 3D imaging? ANS - To improve the
communication gap between the radiologist and surgeon.
How does 3D imaging manipulation work? ANS - Special software gathers information from the
transverse scan data to display 3D images.
What are 7 clinical applications for 3D CT imaging? ANS - Facial fractures, musculoskeletal injuries,
central nervous system, Cardiovascular and pulmonary system, GI, GU, Radiation therapy treatment
planning
T or F: Images can be recorded and subsequently stored in some form of archive, typically printed on
film by a laser camera, or on optical disk. ANS - True
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