Which of the following is best used to describe patient dose in computed tomography? correct answers CTDI & MSAD
Gray-level mapping is an example of a: correct answers point processing technique
The British Department of Health and Social Security assisted in the development of the first clin...
which of the following is best used to describe pa
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Which of the following is best used to describe patient dose in computed tomography?
correct answers CTDI & MSAD
Gray-level mapping is an example of a: correct answers point processing technique
The British Department of Health and Social Security assisted in the development of the first
clinically useful computed tomography scanner. correct answers True
In which of the following is the brightness level of each pixel in a picture measured by a
photomultiplier tube? correct answers sampling
Which of the following converts an analog signal (voltage) into digital data (numbers)?
correct answers an analog-to-digital converter
In the original experiments in computed tomography, the computer took 9 hours to process
one image. correct answers False
In computed tomography, correct answers a computer is used to reconstruct images of
sectional anatomy
Determining tissue types in computed tomography slices is referred to as volume formation
correct answers False
The total number of gray levels is called: correct answers the gray scale
A digital image: correct answers is a numerical representation of an object
An example of a local operation that concerns brightness information on an image is called:
correct answers spatial frequency filtering
Computed tomography is not well established in the study of diseases of the central nervous
system. correct answers False
The process of dividing a picture into small regions called pixels is referred to as: correct
answers scanning
A radiograph is an example of an analog image correct answers True
The following developments in computed tomography were introduced during the period
between 1973-1983 except: correct answers Spiral/ Helical Computed Tomography
Which of the following reduces the amount of data that makes up the image? correct answers
image compression
Which of the following represents the logical order in digitizing an image? correct answers
scanning, sampling, and quantization
,CT has been applied to the study of internal log defects and Egyptian mummies. correct
answers True
The origin of digital image processing stems from: correct answers the space program
A 10 ´ 10 matrix consists of ______ pixels. correct answers 100
What contribution did Cormack make to the development of clinical computed tomography?
correct answers He developed the solutions to the mathematical problems in computed
tomography.
In which of the following is the quality improved of a digital image that has distortions or
degradations? correct answers image restoration
All images displayed for viewing by humans are in the spatial frequency domain. correct
answers False
Who developed the first whole-body computed tomography scanner? correct answers Ledley
The radiation used by Hounsfield in his original experiments was correct answers Gamma
Rays
Cardiac computed tomography applications include, but are not limited to, quantitative
assessment of coronary artery calcifications and ventricular function assessment correct
answers True
Determine tissue types in computed tomography slices correct answers 3D classification
Converting electrical signals into digital correct answers ADC
Surface based rendering correct answers 3D technique
The contraction for "picture element" is: correct answers pixel
Visible images include all of the following except: correct answers mathematical images
The mathematical techniques used by the computer to reconstruct the computed tomography
image are known as: correct answers Image Reconstruction Algorithms
Who developed the first clinically useful computed tomography scanner? correct answers
Hounsfield
,Which type of image processing technique is intended to modify the spatial position of the
pixels in an image? correct answers geometric processing operation
A technique of filtering in the spatial domain rather than in the frequency domain is
convolution. correct answers True
Aliasing results in an artifact that appears as a moiré pattern in the image. correct answers
True
Which image processing hardware is responsible for high-speed processing of the input
digital data? correct answers internal image processor
In 1996, the U.S. Food and Drug Administration approved real-time computed tomography
fluoroscopy as a clinical tool for use in radiology. correct answers True
Isodose curves are a dose descriptor used in reporting radiation doses in computed
tomography correct answers True
Which type(s) of image compression results in no loss of information in the compressed
image data? correct answers I & III
(lossless and reversible)
The Fourier transform is used to transform one image domain into another image domain
correct answers True
An 8-bit analog-to-digital converter will divide a signal into: correct answers 256 parts
Which company pioneered the development of the first clinically useful computed
tomography scanner? correct answers EMI
Data acquisition refers to: correct answers collecting x-ray transmission readings from the
patient
Processing images by computer is referred to as digital image processing correct answers
True
The radiation source is outside the patient in all of the following except: correct answers
Emission CT
Which of the following is the final step in digitizing an image? correct answers quantization
Which acronym has been established by the Radiological Society of North America for use in
major American radiology journals? correct answers CT
The output digital image must first be converted into an analog signal correct answers True
Ambrose received the Nobel Prize in 1979 with Hounsfield correct answers False
Pixels in a digital image representing information contained in a volume of tissue in the
patient are referred to as a: correct answers voxel
, All these elements can be used during data acquisition to reduce patient dose except: correct
answers Reduced pitch
Which of the following assigns integers to the brightness values measured by the
photomultiplier tube? correct answers quantization
Quality control is well established in computed tomography correct answers True
The systematic method of collecting data from the patient is called: correct answers data
acquisition
Currently, the electron-beam computed tomography scanner is marketed by: correct answers
General Electric
A histogram in digital image processing is: correct answers a plot of the number of pixels as a
function of the number of gray levels
Pixels in a digital image representing information contained in a volume of tissue in the
patient are referred to as a: correct answers voxel
Which type of artifact will appear on a digital image as a result of poor sampling of the
analog signal? correct answers aliasing
Digital image processing techniques have been applied successfully in not only the space
program but also in medical imaging. correct answers True
Which of the following refers to modifying computed tomographic data to make the images
more useful to the observer? correct answers Image Manipulation
When a large set of transmission measurements is collected from the patient at different
locations and is used to build up an image of internal anatomy, it is referred to as: correct
answers Image resconstruction from projections
The detectors convert the attenuation data into ____________ signals. correct answers
Electrical
PACS is an acronym for picture archiving and communications systems. correct answers
True
Most frequently used image processing technique correct answers Point Operations
Also called area processes or group processes correct answers Local Operations
A common operation in this processing technique is Fourier domain processing correct
answers Global Operations
This technique can result in the scaling and sizing of images correct answers Geometrical
Operations
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