Edelman Ultrasound physics ch. 15-17
Which of the following scan converters will provide the best spatial resolution?
A. 256X256 pixels
B. 512X512 pixels
C. 128X128 pixels
D. 1000X1000 Pixels - CORRECT ANSWER-1000X1000 pixels
What is the number of shades that can be represented by 3 bits? - CORRECT
ANSWER-8 ( 2X2X2=8)
What is the number of shades that can be respresented by 8 bits? - CORRECT
ANSWER-256 = 2X 2X 2X2X2X2X2X2 with 8 bits, the number 2 is x by itself 8 x
What is the number of shades that can be represented by n bits? - CORRECT
ANSWER-With n bits the number 2 is multiplied by itself n times.
2(n) different gray shades can be stored using n bits.
Which of the following statements regarding a pixel is false?
A. It is the smallest part of a digital image.
B. A collection of bits, assigned to each pixel, stores the shade of gray.
C. It displays up to 3 gray shades simultaneously.
D. Image quality is improved when the number of pixels is high. - CORRECT ANSWER-
It displays up to 3 shades simultaneously.
Are the following procedures usually pre- or postprocessing?
A. modifying a frozen image
B. read zoom
C. write zoom
D. adjusting the brightness on the monitor
E. increasing the receiver gain - CORRECT ANSWER-A. postprocessing
B. postprocessing
C. preprocessing
D. postprocessing
E. preprocessing
What is the primary disadvantage of video tape and computer disc methods of image
archiving?
A. these methods are very costly
B. the information is vulnerable to earasure when exposed to strong magnetic fields
, C. only low resolution images are stored
D. only black and white images are stored - CORRECT ANSWER-the information is
vulnerable to earasure when exposed to strong magnetic fields
Where does coded excitation take place?
A. in the transducer
B. in the receiver
C. in the pulser
D. in the PACS system - CORRECT ANSWER-in the pulser
Which of the following is not true about spatial compounding?
A. data collected from different viewing angles
B. frame rates are reduced
C. shadowing artifact can be eliminated
D. can be performed with a mechanical transducer - CORRECT ANSWER-Can be
performed with a mechanical transducer
Which electronic component is required for gray scale imaging?
A. VCR
B. non-interlaced display
C. computer memory
D. scan converter - CORRECT ANSWER-Scan converter
Which of these statements regarding a bit of computer memory is false?
A. It is the smallest element of an image.
B. It is bistable
C. Eight bits combine to make one byte.
D. It is a component of a digital scan converter. - CORRECT ANSWER-It is the smallest
element of an image.
How many gray shades can be represented by a group of
4 bits? - CORRECT ANSWER-4 bits represent 16 shades
How many gray shades can be represented by a group of 2 bits? - CORRECT
ANSWER-2 bits represent 4 shades
All of the following are advantages of PACS systems except:
A. data will not deteriorate over time
B. images can be delivered to distant locations on the imaging network
C. older archived studies and reports can be reviewed easily
D. images have higher resolution than what appears on the systems display -
CORRECT ANSWER-images have a higher resolution than what appears on the
systems display
Which of the following scan converters will provide the best spatial resolution?
A. 256X256 pixels
B. 512X512 pixels
C. 128X128 pixels
D. 1000X1000 Pixels - CORRECT ANSWER-1000X1000 pixels
What is the number of shades that can be represented by 3 bits? - CORRECT
ANSWER-8 ( 2X2X2=8)
What is the number of shades that can be respresented by 8 bits? - CORRECT
ANSWER-256 = 2X 2X 2X2X2X2X2X2 with 8 bits, the number 2 is x by itself 8 x
What is the number of shades that can be represented by n bits? - CORRECT
ANSWER-With n bits the number 2 is multiplied by itself n times.
2(n) different gray shades can be stored using n bits.
Which of the following statements regarding a pixel is false?
A. It is the smallest part of a digital image.
B. A collection of bits, assigned to each pixel, stores the shade of gray.
C. It displays up to 3 gray shades simultaneously.
D. Image quality is improved when the number of pixels is high. - CORRECT ANSWER-
It displays up to 3 shades simultaneously.
Are the following procedures usually pre- or postprocessing?
A. modifying a frozen image
B. read zoom
C. write zoom
D. adjusting the brightness on the monitor
E. increasing the receiver gain - CORRECT ANSWER-A. postprocessing
B. postprocessing
C. preprocessing
D. postprocessing
E. preprocessing
What is the primary disadvantage of video tape and computer disc methods of image
archiving?
A. these methods are very costly
B. the information is vulnerable to earasure when exposed to strong magnetic fields
, C. only low resolution images are stored
D. only black and white images are stored - CORRECT ANSWER-the information is
vulnerable to earasure when exposed to strong magnetic fields
Where does coded excitation take place?
A. in the transducer
B. in the receiver
C. in the pulser
D. in the PACS system - CORRECT ANSWER-in the pulser
Which of the following is not true about spatial compounding?
A. data collected from different viewing angles
B. frame rates are reduced
C. shadowing artifact can be eliminated
D. can be performed with a mechanical transducer - CORRECT ANSWER-Can be
performed with a mechanical transducer
Which electronic component is required for gray scale imaging?
A. VCR
B. non-interlaced display
C. computer memory
D. scan converter - CORRECT ANSWER-Scan converter
Which of these statements regarding a bit of computer memory is false?
A. It is the smallest element of an image.
B. It is bistable
C. Eight bits combine to make one byte.
D. It is a component of a digital scan converter. - CORRECT ANSWER-It is the smallest
element of an image.
How many gray shades can be represented by a group of
4 bits? - CORRECT ANSWER-4 bits represent 16 shades
How many gray shades can be represented by a group of 2 bits? - CORRECT
ANSWER-2 bits represent 4 shades
All of the following are advantages of PACS systems except:
A. data will not deteriorate over time
B. images can be delivered to distant locations on the imaging network
C. older archived studies and reports can be reviewed easily
D. images have higher resolution than what appears on the systems display -
CORRECT ANSWER-images have a higher resolution than what appears on the
systems display
