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CT Physics questions and correct answers respectively.
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CT Physics questions and correctanswers respectively.
Which of the following is best used to describe patient dose in computed tomography? - CTDI & MSAD
Gray-level mapping is an example of a: - point processing technique
The British Department of Health and Social Security assisted in the development of the first clinically
useful computed tomography scanner. - True
In which of the following is the brightness level of each pixel in a picture measured by a photomultiplier
tube? - sampling
Which of the following converts an analog signal (voltage) into digital data (numbers)? - an analog-to-
digital converter
In the original experiments in computed tomography, the computer took 9 hours to process one image.
- False
In computed tomography, - a computer is used to reconstruct images of sectional anatomy
Determining tissue types in computed tomography slices is referred to as volume formation - False
The total number of gray levels is called: - the gray scale
A digital image: - is a numerical representation of an object
An example of a local operation that concerns brightness information on an image is called: - spatial
frequency filtering
,Computed tomography is not well established in the study of diseases of the central nervous system. -
False
The process of dividing a picture into small regions called pixels is referred to as: - scanning
A radiograph is an example of an analog image - True
The following developments in computed tomography were introduced during the period between
1973-1983 except: - Spiral/ Helical Computed Tomography
Which of the following reduces the amount of data that makes up the image? - image compression
Which of the following represents the logical order in digitizing an image? - scanning, sampling, and
quantization
CT has been applied to the study of internal log defects and Egyptian mummies. - True
The origin of digital image processing stems from: - the space program
A 10 ´ 10 matrix consists of ______ pixels. - 100
What contribution did Cormack make to the development of clinical computed tomography? - 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?
- image restoration
All images displayed for viewing by humans are in the spatial frequency domain. - False
,Who developed the first whole-body computed tomography scanner? - Ledley
The radiation used by Hounsfield in his original experiments was - Gamma Rays
Cardiac computed tomography applications include, but are not limited to, quantitative assessment of
coronary artery calcifications and ventricular function assessment - True
Determine tissue types in computed tomography slices - 3D classification
Algorithms - Image Reconstruction
Image Storage - Optical Disks
Computed Tomography Dose Descriptor - MSAD
Converting electrical signals into digital - ADC
Surface based rendering - 3D technique
The contraction for "picture element" is: - pixel
Visible images include all of the following except: - mathematical images
The mathematical techniques used by the computer to reconstruct the computed tomography image
are known as: - Image Reconstruction Algorithms
Who developed the first clinically useful computed tomography scanner? - Hounsfield
Which type of image processing technique is intended to modify the spatial position of the pixels in an
image? - geometric processing operation
, A technique of filtering in the spatial domain rather than in the frequency domain is convolution. - True
Aliasing results in an artifact that appears as a moiré pattern in the image. - True
Which image processing hardware is responsible for high-speed processing of the input digital data? -
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. - True
Isodose curves are a dose descriptor used in reporting radiation doses in computed tomography - True
Which type(s) of image compression results in no loss of information in the compressed image data? - I
& III
(lossless and reversible)
The Fourier transform is used to transform one image domain into another image domain - True
An 8-bit analog-to-digital converter will divide a signal into: - 256 parts
Which company pioneered the development of the first clinically useful computed tomography scanner?
- EMI
Data acquisition refers to: - collecting x-ray transmission readings from the patient
Processing images by computer is referred to as digital image processing - True
The radiation source is outside the patient in all of the following except: - Emission CT
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