Autotransformer
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Located within the primary or low voltage circuit between the incoming
line voltage and the primary side of the step-up transformer, purpose is to
determine the amount to line voltage that will be sent to the step-up
transformer, operates on the principle of electromagnetic self induction
(one wire), a single coil of conductor material acts as both the primary and
secondary sides of the autotransformer
Each pixel is given a numeric value (CT number or Hounsfield unit) based on...
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, The receptor exposure of the pixel
Region of interest (ROI)
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The boundaries of an object on an image
Principle of Automatic Exposure Control (AEC)
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AEC units are designed to produce a desired amount of receptor exposure
on images taken of selected body parts regardless of changes within the
patients being examined
Short scale contrast
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The image receptor exhibits few variations in opacity (receptor exposure)
with great differences in opacity, high scale = short contrast
Teleradiology
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, Process of remote transmission and viewing of images
What is the minimum rate at which a signal can be sampled without introducing
errors?
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2x the highest frequency present (Nyquest)
Types of nosie
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Quantum mottle, scatter, electronic
Photocathode
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Converts light photons from the input phosphor into free electrons
Electromagnetic induction
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, Creating an electromagnetic force (EMF) (voltage) or potential difference
within a conductor material that cuts across magnetic lines of force
Electrostatic lens
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Located along the full length of the image intensification tube,
directs/focuses the path of electrons from the photocathode to the surface
of the output phosphor screen
Radiology information system (RIS)
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Contains radiology specific information about a patient including the
radiologist's report (modality work list)
Smoothing (spatial frequency filtering)
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Occurs by averaging all pixels frequency with surrounding pixel values to
remove image noise
Atelectasis
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Located within the primary or low voltage circuit between the incoming
line voltage and the primary side of the step-up transformer, purpose is to
determine the amount to line voltage that will be sent to the step-up
transformer, operates on the principle of electromagnetic self induction
(one wire), a single coil of conductor material acts as both the primary and
secondary sides of the autotransformer
Each pixel is given a numeric value (CT number or Hounsfield unit) based on...
Give this one a try later!
, The receptor exposure of the pixel
Region of interest (ROI)
Give this one a try later!
The boundaries of an object on an image
Principle of Automatic Exposure Control (AEC)
Give this one a try later!
AEC units are designed to produce a desired amount of receptor exposure
on images taken of selected body parts regardless of changes within the
patients being examined
Short scale contrast
Give this one a try later!
The image receptor exhibits few variations in opacity (receptor exposure)
with great differences in opacity, high scale = short contrast
Teleradiology
Give this one a try later!
, Process of remote transmission and viewing of images
What is the minimum rate at which a signal can be sampled without introducing
errors?
Give this one a try later!
2x the highest frequency present (Nyquest)
Types of nosie
Give this one a try later!
Quantum mottle, scatter, electronic
Photocathode
Give this one a try later!
Converts light photons from the input phosphor into free electrons
Electromagnetic induction
Give this one a try later!
, Creating an electromagnetic force (EMF) (voltage) or potential difference
within a conductor material that cuts across magnetic lines of force
Electrostatic lens
Give this one a try later!
Located along the full length of the image intensification tube,
directs/focuses the path of electrons from the photocathode to the surface
of the output phosphor screen
Radiology information system (RIS)
Give this one a try later!
Contains radiology specific information about a patient including the
radiologist's report (modality work list)
Smoothing (spatial frequency filtering)
Give this one a try later!
Occurs by averaging all pixels frequency with surrounding pixel values to
remove image noise
Atelectasis
