CT Physics Questions with Accurate Answers
__________ information is used to assess the three elements of technique of the
three-dimensional imaging procedure. correct answer Quantitative
1 Sievert is equal to: correct answer 100 rems
A 10 ´ 10 matrix consists of ______ pixels. correct answer 100
A common operation in this processing technique is Fourier domain processing
correct answer Global Operations
A computed tomography image of 12 bits per pixel means: correct answer each
pixel can have a total of 4096 shades of gray
A digital image is a discrete function correct answer True
A digital image: correct answer is a numerical representation of an object
A histogram in digital image processing is: correct answer a plot of the number of
pixels as a function of the number of gray levels
A large window width indicates that there is a relatively ______________ gray
scale. correct answer long
,A measurement of a computed tomography scanner's performance to ensure the
scanner is operating at an acceptable level describes: correct answer quality
assurance
A radiograph is an example of an analog image correct answer True
A scaling factor of 1000 in the Hounsfield scale for K results in a: correct answer
contrast scale of 0.1 % per computed tomography number
A set of ray sums is referred to as a: correct answer projection
A single ray in computed tomography is: correct answer a single straight line path
of an x-ray beam
A small focal spot size or lower tube current will result in: correct answer higher
spatial resolution
A technique of filtering in the spatial domain rather than in the frequency domain
is convolution. correct answer True
A view in computed tomography is: correct answer a collection of rays for one
translation across the object
Algorithms correct answer Image Reconstruction
Algorithms for sliding thin slabs include all of the following except: correct answer
,Aliasing results in an artifact that appears as a moiré pattern in the image. correct
answer True
All images displayed for viewing by humans are in the spatial frequency domain.
correct answer False
All of the following affect noise in spiral/helical computed tomography except:
correct answer detector cell size
All of the following apply to CT except: correct answer x-ray film is used as the
detector
All of the following are automated systems used to assist with contrast
administration except: correct answer Smart Bolus
All of the following are categories of computed tomography software except:
correct answer detector software
All of the following are examples of image visualization and analysis software
tools except: correct answer liquid crystal display
All of the following are fundamental imaging principles involved in real-time
computed tomography except: correct answer NOT A OR C
All of the following are major categories of artifacts except: correct answer noise
, All of the following are major elements of a typical three-dimensional imaging
system except: correct answer detector array
All of the following are possible causes of failure for the standard deviation of the
computed tomography number except: correct answer miscalibration of the
algorithm
All of the following are problems associated with transporting patients to a fixed
computed tomography scanner except: correct answer inconvenience to the
patient's family
All of the following are purposes of the image display, recording, storage, and
communication system except: correct answer enables scanning procedures
All of the following are radiation beams produced by an x-ray tube designed for
computed tomography except: correct answer homogeneous beam
All of the following are requirements for volume scanning except: correct answer
tube memory
All of the following are shading algorithms except: correct answer polygonal
shading
All of the following are steps crucial to performing a computed tomographic
angiography examination except: correct answer decreased collimation
All of the following are tissue types used for voxel classification except: correct
answer connective
__________ information is used to assess the three elements of technique of the
three-dimensional imaging procedure. correct answer Quantitative
1 Sievert is equal to: correct answer 100 rems
A 10 ´ 10 matrix consists of ______ pixels. correct answer 100
A common operation in this processing technique is Fourier domain processing
correct answer Global Operations
A computed tomography image of 12 bits per pixel means: correct answer each
pixel can have a total of 4096 shades of gray
A digital image is a discrete function correct answer True
A digital image: correct answer is a numerical representation of an object
A histogram in digital image processing is: correct answer a plot of the number of
pixels as a function of the number of gray levels
A large window width indicates that there is a relatively ______________ gray
scale. correct answer long
,A measurement of a computed tomography scanner's performance to ensure the
scanner is operating at an acceptable level describes: correct answer quality
assurance
A radiograph is an example of an analog image correct answer True
A scaling factor of 1000 in the Hounsfield scale for K results in a: correct answer
contrast scale of 0.1 % per computed tomography number
A set of ray sums is referred to as a: correct answer projection
A single ray in computed tomography is: correct answer a single straight line path
of an x-ray beam
A small focal spot size or lower tube current will result in: correct answer higher
spatial resolution
A technique of filtering in the spatial domain rather than in the frequency domain
is convolution. correct answer True
A view in computed tomography is: correct answer a collection of rays for one
translation across the object
Algorithms correct answer Image Reconstruction
Algorithms for sliding thin slabs include all of the following except: correct answer
,Aliasing results in an artifact that appears as a moiré pattern in the image. correct
answer True
All images displayed for viewing by humans are in the spatial frequency domain.
correct answer False
All of the following affect noise in spiral/helical computed tomography except:
correct answer detector cell size
All of the following apply to CT except: correct answer x-ray film is used as the
detector
All of the following are automated systems used to assist with contrast
administration except: correct answer Smart Bolus
All of the following are categories of computed tomography software except:
correct answer detector software
All of the following are examples of image visualization and analysis software
tools except: correct answer liquid crystal display
All of the following are fundamental imaging principles involved in real-time
computed tomography except: correct answer NOT A OR C
All of the following are major categories of artifacts except: correct answer noise
, All of the following are major elements of a typical three-dimensional imaging
system except: correct answer detector array
All of the following are possible causes of failure for the standard deviation of the
computed tomography number except: correct answer miscalibration of the
algorithm
All of the following are problems associated with transporting patients to a fixed
computed tomography scanner except: correct answer inconvenience to the
patient's family
All of the following are purposes of the image display, recording, storage, and
communication system except: correct answer enables scanning procedures
All of the following are radiation beams produced by an x-ray tube designed for
computed tomography except: correct answer homogeneous beam
All of the following are requirements for volume scanning except: correct answer
tube memory
All of the following are shading algorithms except: correct answer polygonal
shading
All of the following are steps crucial to performing a computed tomographic
angiography examination except: correct answer decreased collimation
All of the following are tissue types used for voxel classification except: correct
answer connective
