DSC1520 EXAM PACK COMPREHENSIVE
SCRIPT 2026 FULL ANSWERS GRADED A+
⩥ *scattered and off focus radiation* outside of the collimated field can
have _______ effect on *width of histogram*.
Answer: widening
⩥ why is it important to *erase the Imaging Plate* if it has not been 48
hours.
Answer: to avoid background radiation artifacts
⩥ What is the name of the computer system that tracks admission and
discharge information, diagnostic and treatment services, pharmaceutical
and equipment information, and billing information?.
Answer: *HIS* (Hospital Information System)
⩥ What is the name of the computer system that tracks radiologic
procedure ordering and scheduling, patient database maintenance,
reporting and transcription, and billing..
Answer: *RIS* (Radiology Information System)
⩥ What is the name of the network of computers that is capable of
acquiring, storing, and transmitting medical images.
,Answer: *PACS* (Picture Archiving Communication System)
⩥ In CR, to what does the term "saturation" refer?.
Answer: overexposure of PSP
⩥ In digital systems, pixel pitch is related to spatial resolution. The
_____ pixel pitch, the better the spatial resolution..
Answer: smaller
⩥ How are the Nyquist frequency and pixel pitch related to spatial
resolution?.
Answer: Maximum spatial resolution + Nyquist frequency (which equals
to one-half the pixel pitch [mm])
⩥ What resolution results from using *Nyquist Frequency*.
Answer: = max resolution
⩥ What pixel pitch results from using *Nyquist Frequency*.
Answer: = 1/2 pitch
( = better resolution)
, ⩥ _In CR, *beyond a certain exposure level, a large number of pixels
reach max digital value resulting in loss of detail visibility*. This
defines.
Answer: over-saturation
⩥ If a 0.050-mm pixel yields a Nyquist 10 lp/mm, a 0.100-mm pixel will
yield a Nyquist of _____..
Answer: 5 lp/mm (Nyquist = 0.5 pixel pitch in mm)
⩥ *direct digital (cassetteless systems)* have a fixed spatial resolution
that is determined by ______.
Answer: thin film transistor (TFT) detector element (DEL) size
(smaller DEL = better/higher resolution)
⩥ As sampling frequent increases, spatial resolution increases, spatial
resolution increases. How is sampling frequency expressed.
Answer: Pixels/mm or pixel density
⩥ What is the most common cause of histogram analysis errors?.
Answer: exposure field recognition errors
⩥ The feature of digital imaging that *provides correction of over or
under exposure by way of histogram shift* is referred to as ______.
SCRIPT 2026 FULL ANSWERS GRADED A+
⩥ *scattered and off focus radiation* outside of the collimated field can
have _______ effect on *width of histogram*.
Answer: widening
⩥ why is it important to *erase the Imaging Plate* if it has not been 48
hours.
Answer: to avoid background radiation artifacts
⩥ What is the name of the computer system that tracks admission and
discharge information, diagnostic and treatment services, pharmaceutical
and equipment information, and billing information?.
Answer: *HIS* (Hospital Information System)
⩥ What is the name of the computer system that tracks radiologic
procedure ordering and scheduling, patient database maintenance,
reporting and transcription, and billing..
Answer: *RIS* (Radiology Information System)
⩥ What is the name of the network of computers that is capable of
acquiring, storing, and transmitting medical images.
,Answer: *PACS* (Picture Archiving Communication System)
⩥ In CR, to what does the term "saturation" refer?.
Answer: overexposure of PSP
⩥ In digital systems, pixel pitch is related to spatial resolution. The
_____ pixel pitch, the better the spatial resolution..
Answer: smaller
⩥ How are the Nyquist frequency and pixel pitch related to spatial
resolution?.
Answer: Maximum spatial resolution + Nyquist frequency (which equals
to one-half the pixel pitch [mm])
⩥ What resolution results from using *Nyquist Frequency*.
Answer: = max resolution
⩥ What pixel pitch results from using *Nyquist Frequency*.
Answer: = 1/2 pitch
( = better resolution)
, ⩥ _In CR, *beyond a certain exposure level, a large number of pixels
reach max digital value resulting in loss of detail visibility*. This
defines.
Answer: over-saturation
⩥ If a 0.050-mm pixel yields a Nyquist 10 lp/mm, a 0.100-mm pixel will
yield a Nyquist of _____..
Answer: 5 lp/mm (Nyquist = 0.5 pixel pitch in mm)
⩥ *direct digital (cassetteless systems)* have a fixed spatial resolution
that is determined by ______.
Answer: thin film transistor (TFT) detector element (DEL) size
(smaller DEL = better/higher resolution)
⩥ As sampling frequent increases, spatial resolution increases, spatial
resolution increases. How is sampling frequency expressed.
Answer: Pixels/mm or pixel density
⩥ What is the most common cause of histogram analysis errors?.
Answer: exposure field recognition errors
⩥ The feature of digital imaging that *provides correction of over or
under exposure by way of histogram shift* is referred to as ______.
