PACS MIDTERM EXAM QUESTIONS
AND ANSWERS ALL CORRECT
Which function represents the range of gray values that are being viewed on the
monitor?
a. Window
b. Level
c. Contrast
d. Density - Answer- a. Window
The acronym PACS stands for ______ system.
a. Picture archival and control
b. Picture archival and communication
c. Physical archive and communication
d. Physical archive and compression - Answer- b. Picture archival and communication
When matrix size is increased and pixel size goes down,
a. spatial resolution decreases.
b. spatial resolution increases.
c. contrast increases.
d. both a and c. - Answer- b. spatial resolution increases.
The four steps of creating an image with computed radiography are ______________.
a. metastable state, stimulate, read, and erase
b. erase, stimulate, metastable state, and read
c. read, erase, stimulate, and metastable state
d. metastable state, read, erase, and stimulate - Answer- a. metastable state, stimulate,
read, and erase
Europium is the ______________ of the photostimulable phosphor.
a. image buffer
b. scintillator
c. phosphor
d. activator - Answer- d. activator
, In a radiology department that is consistent with ALARA guidelines
a. EI#s and DI#s cannot be used interchangeably.
b. Target EI#s for all exams will be established.
c. EI#s and DI#s are used as benchmarks of image quality.
d. all of the above. - Answer- d. all of the above.
Inappropriate brightness on a digital image can be caused by:
1. poor collimation.
2. incorrect menu selection.
3. poor positioning.
a. 1 and 2
b. 1 and 3
c. 2 and 3
d. 1, 2, and 3 - Answer- d. 1, 2, and 3
The shape and distribution of values on an x-ray exposure histogram is specific to
selected anatomy and the exposure used for the exam. In the histogram, the data is
analyzed to identify the __________.
a. line spread function
b. point spread function
c. values of interest (VOI)
d. modulation transfer function (MTF) - Answer- c. values of interest (VOI)
A voxel is different than a pixel in that a voxel
a. has only two dimensions
b. controls the volume of audio
c. possesses a third dimension
d. controls the pixel dimensions - Answer- c. possesses a third dimension
A pixel that has an eight-bit depth displays _______ shades of gray.
a. 126
b. 256
c. 512
d. 1024 - Answer- b. 256
Analog to digital conversion involves two steps. They are quantification and
___________.
a. rescaling
b. sampling
c. pixelization
AND ANSWERS ALL CORRECT
Which function represents the range of gray values that are being viewed on the
monitor?
a. Window
b. Level
c. Contrast
d. Density - Answer- a. Window
The acronym PACS stands for ______ system.
a. Picture archival and control
b. Picture archival and communication
c. Physical archive and communication
d. Physical archive and compression - Answer- b. Picture archival and communication
When matrix size is increased and pixel size goes down,
a. spatial resolution decreases.
b. spatial resolution increases.
c. contrast increases.
d. both a and c. - Answer- b. spatial resolution increases.
The four steps of creating an image with computed radiography are ______________.
a. metastable state, stimulate, read, and erase
b. erase, stimulate, metastable state, and read
c. read, erase, stimulate, and metastable state
d. metastable state, read, erase, and stimulate - Answer- a. metastable state, stimulate,
read, and erase
Europium is the ______________ of the photostimulable phosphor.
a. image buffer
b. scintillator
c. phosphor
d. activator - Answer- d. activator
, In a radiology department that is consistent with ALARA guidelines
a. EI#s and DI#s cannot be used interchangeably.
b. Target EI#s for all exams will be established.
c. EI#s and DI#s are used as benchmarks of image quality.
d. all of the above. - Answer- d. all of the above.
Inappropriate brightness on a digital image can be caused by:
1. poor collimation.
2. incorrect menu selection.
3. poor positioning.
a. 1 and 2
b. 1 and 3
c. 2 and 3
d. 1, 2, and 3 - Answer- d. 1, 2, and 3
The shape and distribution of values on an x-ray exposure histogram is specific to
selected anatomy and the exposure used for the exam. In the histogram, the data is
analyzed to identify the __________.
a. line spread function
b. point spread function
c. values of interest (VOI)
d. modulation transfer function (MTF) - Answer- c. values of interest (VOI)
A voxel is different than a pixel in that a voxel
a. has only two dimensions
b. controls the volume of audio
c. possesses a third dimension
d. controls the pixel dimensions - Answer- c. possesses a third dimension
A pixel that has an eight-bit depth displays _______ shades of gray.
a. 126
b. 256
c. 512
d. 1024 - Answer- b. 256
Analog to digital conversion involves two steps. They are quantification and
___________.
a. rescaling
b. sampling
c. pixelization
