CT EXAM #1 QUESTIONS AND
ANSWERS
Sectional images are obtained from all of the following except:
A. tomography
B. transverse axial tomography
C. conventional radiography
D. computed tomography - Answer-C. Conventional radiography
Who developed the first clinically useful CT scanner?
A. Cormack
B. Roentgen
C. Hounsfield
D. Siemens Medical Systems - Answer-C. Hounsfield
All these elements can be used during data acquisition to reduce patient dose except:
A. combined applications
B. ultrafast ceramic detectors
C. decreased pitch
D. online dose modulation - Answer-C. decreased pitch
The detectors convert the attenuation data into ____________ signals.
A. digital
B. electrical
C. light
D. mechanical - Answer-B. electrical
The mathematical techniques used by the computer to reconstruct the CT image are
known as:
A. computer programs
B. image reconstruction algorithms
C. manipulation of images
D. pattern recognition - Answer-B. image reconstruction algorithms
What form of archiving has proven most popular among CT departments?
A. film-based recording
B. optical card
C. picture archiving and communication system
D. magnetic tapes - Answer-C. picture archiving and communication system
A digital image:
A. is a continuous image
B. is a numerical representation of an object
C. cannot be processed by a digital computer
, D. is a nonvisible physical image - Answer-B. is a numerical representation of an object
The contraction for "picture element" is:
A. pixel
B. voxel
C. matrix
D. address - Answer-A. pixel
A 10 x 10 matrix consists of ______ pixels.
A. 10
B. 20
C. 100
D. 120 - Answer-C. 100
The systematic method of collecting data from the patient is called:
A. image processing
B. data acquisition
C. image display
D. image communication - Answer-B. data acquisition
The purpose of image enhancement is:
A. to generate an image more pleasing to the observer
B. to improve the quality of images that have distortions
C. to allow measurements and statistics to be performed
D. to reduce the size of the image - Answer-A. to generate an image more pleasing to
the observer
Pixels in a digital image representing information contained in a volume of tissue in the
patient are referred to as a:
A. pixel
B. voxel
C. bit depth
D. matrix - Answer-B. voxel
The total number of gray levels is called:
A. a matrix
B. the grayscale
C. an electronic signal
D. bit depth - Answer-B. the grayscale
All the following apply to computed tomography (CT) except:
A. a computer is used to reconstruct cross-sectional images of the patient.
B. mathematical methods are used to reconstruct images.
C. x-ray film is used as the detector.
D. special detectors are used to detect x-rays that have passed through the patient at
multiple angles. - Answer-C. x-ray film is used as the detector.
ANSWERS
Sectional images are obtained from all of the following except:
A. tomography
B. transverse axial tomography
C. conventional radiography
D. computed tomography - Answer-C. Conventional radiography
Who developed the first clinically useful CT scanner?
A. Cormack
B. Roentgen
C. Hounsfield
D. Siemens Medical Systems - Answer-C. Hounsfield
All these elements can be used during data acquisition to reduce patient dose except:
A. combined applications
B. ultrafast ceramic detectors
C. decreased pitch
D. online dose modulation - Answer-C. decreased pitch
The detectors convert the attenuation data into ____________ signals.
A. digital
B. electrical
C. light
D. mechanical - Answer-B. electrical
The mathematical techniques used by the computer to reconstruct the CT image are
known as:
A. computer programs
B. image reconstruction algorithms
C. manipulation of images
D. pattern recognition - Answer-B. image reconstruction algorithms
What form of archiving has proven most popular among CT departments?
A. film-based recording
B. optical card
C. picture archiving and communication system
D. magnetic tapes - Answer-C. picture archiving and communication system
A digital image:
A. is a continuous image
B. is a numerical representation of an object
C. cannot be processed by a digital computer
, D. is a nonvisible physical image - Answer-B. is a numerical representation of an object
The contraction for "picture element" is:
A. pixel
B. voxel
C. matrix
D. address - Answer-A. pixel
A 10 x 10 matrix consists of ______ pixels.
A. 10
B. 20
C. 100
D. 120 - Answer-C. 100
The systematic method of collecting data from the patient is called:
A. image processing
B. data acquisition
C. image display
D. image communication - Answer-B. data acquisition
The purpose of image enhancement is:
A. to generate an image more pleasing to the observer
B. to improve the quality of images that have distortions
C. to allow measurements and statistics to be performed
D. to reduce the size of the image - Answer-A. to generate an image more pleasing to
the observer
Pixels in a digital image representing information contained in a volume of tissue in the
patient are referred to as a:
A. pixel
B. voxel
C. bit depth
D. matrix - Answer-B. voxel
The total number of gray levels is called:
A. a matrix
B. the grayscale
C. an electronic signal
D. bit depth - Answer-B. the grayscale
All the following apply to computed tomography (CT) except:
A. a computer is used to reconstruct cross-sectional images of the patient.
B. mathematical methods are used to reconstruct images.
C. x-ray film is used as the detector.
D. special detectors are used to detect x-rays that have passed through the patient at
multiple angles. - Answer-C. x-ray film is used as the detector.
