Intro to Radiographic Imaging Final Exam
with Accurate Solutions
Digital images are stored and distributed by the - ANSWER-PACS
Digital images can demonstrate more shades of gray than an image on film because -
ANSWER-each pixel can produce over a thousand shades of gray.
When choosing an image receptor for CR, to produce the greatest image resolution one
must - ANSWER-use the smallest image receptor compatible with the size of the part.
The CR PSP imaging receptor is very sensitive to scatter radiation and image fog. To
reduce this a radiographer should - ANSWER-*erase the plate if it has been sitting
unused over night and collimate to part size
Computed radiography is also referred to as - ANSWER-PSP technology
Indirect DR with a flat panel uses ( ) as the detector material - ANSWER-amorphous
silicon
Images that can be acquired, processed and manipulated is a definition of - ANSWER-
digital imaging
A disadvantage of film/screen imaging is that - ANSWER-*there is only one copy of the
image
*kvp controls contrast
*too much mAs makes the radiograph dark
*ALL the ABOVE
Which type of digital imaging requires a process that is most like film/screen imaging? -
ANSWER-Computed Radiography (CR)
Which of the following processes describes the Computed Radiography (DR) imaging
process - ANSWER-Phosphor plate--> laser light scanner-->photomultiplier tube--
>ADC--->computer
When matrix size gets larger, pixel sizes get ----- - ANSWER-smaller
Digital radiographic systems are prone to OVER exposing the patient and violating the
principle of ALARA by - ANSWER-*technique used can be up to 200% too much
*There is little feedback about the amount of exposure used to modify technique.
, *automatic rescaling of the image
*All the above!
of all the choices the greatest ALARA violation would be - ANSWER-repeating an image
with a S # of 210 because of exposure technique
When using CR technology it is important to remember that - ANSWER-*The IP is extra
sensitive to exposure after initial X-ray exposure
*the IP will lose about 25% of its signal in 8 hr if not processed
*the IP is sensitive to scatter , making grids very important
*ALL the Above
In the technology of CR, the latent image is actually - ANSWER-electrons trapped in
conduction bands in the atoms
in CR technology, preprocessing of data includes - ANSWER-*histogram analysis
*grayscale analysis
*exposure data recognition (EDR)
*ALL the above
In digital image technology, once the image data is sent to PACS - ANSWER-the data is
fixed and not able to be reprocessed
A common feature between indirect and direct DR technology is - ANSWER-the use of
thin film transistors (tFT's)
Computerized digital images consist of a ( )of picture elements,each with a density pixel
value or gray shade. - ANSWER-Matrix
In digital image processing , the digital data set is arranged into histogram in order to
determine the - ANSWER-Values of Interest (VOI'S)
The purpose of a LUT is to - ANSWER-apply a predetermined scale of contrast to the
digital data set.
The radiographer can improve image noise on an image by - ANSWER-increasing the
exposure technique (mAs)
Of the choices , the best S:N ratio is - ANSWER-1000:1
An S value of 200 represents an - ANSWER-exposure to the IP of 1 MR
When changing exposure technique from 9 mAs to 18 mAs using Konica or Fuji
computed radiography system the radiographer should expect - ANSWER-a decrease
in S# from 200 to 100
with Accurate Solutions
Digital images are stored and distributed by the - ANSWER-PACS
Digital images can demonstrate more shades of gray than an image on film because -
ANSWER-each pixel can produce over a thousand shades of gray.
When choosing an image receptor for CR, to produce the greatest image resolution one
must - ANSWER-use the smallest image receptor compatible with the size of the part.
The CR PSP imaging receptor is very sensitive to scatter radiation and image fog. To
reduce this a radiographer should - ANSWER-*erase the plate if it has been sitting
unused over night and collimate to part size
Computed radiography is also referred to as - ANSWER-PSP technology
Indirect DR with a flat panel uses ( ) as the detector material - ANSWER-amorphous
silicon
Images that can be acquired, processed and manipulated is a definition of - ANSWER-
digital imaging
A disadvantage of film/screen imaging is that - ANSWER-*there is only one copy of the
image
*kvp controls contrast
*too much mAs makes the radiograph dark
*ALL the ABOVE
Which type of digital imaging requires a process that is most like film/screen imaging? -
ANSWER-Computed Radiography (CR)
Which of the following processes describes the Computed Radiography (DR) imaging
process - ANSWER-Phosphor plate--> laser light scanner-->photomultiplier tube--
>ADC--->computer
When matrix size gets larger, pixel sizes get ----- - ANSWER-smaller
Digital radiographic systems are prone to OVER exposing the patient and violating the
principle of ALARA by - ANSWER-*technique used can be up to 200% too much
*There is little feedback about the amount of exposure used to modify technique.
, *automatic rescaling of the image
*All the above!
of all the choices the greatest ALARA violation would be - ANSWER-repeating an image
with a S # of 210 because of exposure technique
When using CR technology it is important to remember that - ANSWER-*The IP is extra
sensitive to exposure after initial X-ray exposure
*the IP will lose about 25% of its signal in 8 hr if not processed
*the IP is sensitive to scatter , making grids very important
*ALL the Above
In the technology of CR, the latent image is actually - ANSWER-electrons trapped in
conduction bands in the atoms
in CR technology, preprocessing of data includes - ANSWER-*histogram analysis
*grayscale analysis
*exposure data recognition (EDR)
*ALL the above
In digital image technology, once the image data is sent to PACS - ANSWER-the data is
fixed and not able to be reprocessed
A common feature between indirect and direct DR technology is - ANSWER-the use of
thin film transistors (tFT's)
Computerized digital images consist of a ( )of picture elements,each with a density pixel
value or gray shade. - ANSWER-Matrix
In digital image processing , the digital data set is arranged into histogram in order to
determine the - ANSWER-Values of Interest (VOI'S)
The purpose of a LUT is to - ANSWER-apply a predetermined scale of contrast to the
digital data set.
The radiographer can improve image noise on an image by - ANSWER-increasing the
exposure technique (mAs)
Of the choices , the best S:N ratio is - ANSWER-1000:1
An S value of 200 represents an - ANSWER-exposure to the IP of 1 MR
When changing exposure technique from 9 mAs to 18 mAs using Konica or Fuji
computed radiography system the radiographer should expect - ANSWER-a decrease
in S# from 200 to 100
