Vision And Perception

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IMAGE PERCEPTION
*Visual misrepresentations
-Can be dangerous in
clinical radiography
*Avoid preconceived ideas
-Mental erasing of
opinions to permit high-quality viewing of
radiographic images
-Experience d technologists produce images to
maximise diagnostic process

*Visual anatomy
– The human eye is designed to ‘gather’,
‘focus’, ‘convert’, and ‘transmit’
* Visual physiology
– 0.2 seconds to acquire information;
‘staring’ at an item does not improve visual
quality
*Rod and Cone Cells
– Contain photosensitive pigments that
respond to light

*Photopic (daylight) vision
– Cones allow greater visual acuity and
contrast perception
*Scotopic (night) vision
– Entirely peripheral and therefore difficult
to focus
*Inefficiency of the medical imaging process
– 1 out of 100,000 photons
contribute to impulses
received by the brain
FIGURE 14-3 Human visual ability.
*Threshold detection
– Perception of extremely
small or faint details
*Boundary effect
– Visual system and their ability to perceive
contrast differences
– 25-33% change to be visible
Vision And Perception U1 2

*Mach effect
– Occurs when the eye perceives a boundary
– Edge enhancement makes the boundary
more distinct than it really is
*Eye motion
– A scanning motion increases contrast
perception
*Veil glare
– When intensely bright light floods the eye
directly
*Viewing distance
– Changes the intensity of the light (ISL) and
the
angle of the incident light photons
*Pattern Recognition
– Comparing mental images of patterns
(anatomical, physiological, etc) to provide a
diagnostic opinion

*Thinking three-dimensionally
– View images from a 3D perspective
– “Radiographic positioning requires a solid
knowledge of the shape and location of
skeletal
and soft tissue structures…”
– Develop the ability to mentally visualize the
change of overlapping structures

RADIOGRAPHY AS AN ART FORM
*Artistic radiography
*MVA situation requires adaptations to
conventional positioning
* Non-destructive testing
– Assessment of materials
i.e. castings and welds
* Biological research
– I.e. study of birds and bats in flight

* Veterinary radiography
* Forensic radiography

 

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