CT - Chapter 1 - Intro to CT || WITH COMPLETE SOLUTIONS!!
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Course
CT
Institution
CT
What is a specialized x-ray procedure that involves the measurement of x-ray attenuation passing through a given part of human anatomy called? correct answers Computed Tomography (CT)
What measures the non-absorbed x-rays that pass through anatomical structure and send this information to a comp...
CT - Chapter 1 - Intro to CT || WITH COMPLETE
SOLUTIONS!!
What is a specialized x-ray procedure that involves the measurement of x-ray attenuation
passing through a given part of human anatomy called? correct answers 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? correct answers 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? correct answers
Reconstruction
How does Computed Tomography differ from conventional radiography? correct answers
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. correct answers composition and size
The formation of CT images by a CT scanner involves what 3 major steps? correct answers 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. correct answers 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? correct answers 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. correct answers 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. correct answers
Digital (numerical)
The computer uses a mathematical calculation called ___ ___ to reconstruct the CT image.
correct answers Back Projection
The reconstructed image is in ____ form and must be converted back to ____ _____ for
analog viewing on the television monitor. correct answers Numeric, electrical signals
With image display, ___ ___ images are created from the digital data. correct answers 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). correct answers Multiplanar
Reconstruction
The CT image is composed of a range of CT numbers ( ___ to ___ for a total of ____ ) that
represent varying shades of gray. correct answers -1000 to +1000 for a total of 2000
The process of changing the CT image gray scale is termed ___. correct answers Windowing
What is one of the major motivating factors for the development of 3D imaging? correct
answers To improve the communication gap between the radiologist and surgeon.
How does 3D imaging manipulation work? correct answers Special software gathers
information from the transverse scan data to display 3D images.
What are 7 clinical applications for 3D CT imaging? correct answers 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. correct answers True
What in the CT department refers to the electronic transmission of text data and images from
the CT Scanner to other devices, such as laser printers, diagnostic workstations, display
monitors in the radiology and other departments within the hospital and computers outside
the hospital or imaging center? correct answers Communications
T or F: CT was the second widely used medical imaging modality which exclusively
provided computed digital images. correct answers False, it was the first
CT images are transverse sections which lie _____ to the long axis of the body. correct
answers Perpendicular
Which term is often used interchangeably with transverse? correct answers Axial
How is axial different from transverse? correct answers Axial just means the slice is oriented
perpendicular to an axis - it doesn't specify which axis
The three traditional directions for cross-sectional imaging correspond to what 3 planes of the
body? correct answers Transverse, Sagittal, Coronal
CT produces images which are typically ______ to the long axis of the body or transverse
sections. Why? correct answers Perpendicular, this is because in CT patient's typically lie
supine on the CT table, placing the transverse axis perpendicular to the x-ray beam.
The only way to DIRECTLY acquire CT images in a coronal or sagittal orientation is to place
the patient in an awkward position to allow the x-ray beam to pass ____ to the plane. correct
answers Perpendicular
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