Shared Flashcard Set

Details

Exposure Errors
exposure errors and corrections
14
Health Care
Undergraduate 2
05/15/2011

Additional Health Care Flashcards

 


 

Cards

Term
film latitude
Definition
produce long range of grays
Term
sensitometry
Definition
study of film emulsions response to exposure
Term
solarization
Definition
beyond Dmax; image reversal
Term
reading a sensitomety curve:
steep slope indicates
- affect on exposure factor
Definition
fast film response, with little latitude, and higher contrast - decrease exposure
*curve is on the left
Term
exposure latitude
Definition
leeway or margin of error one has with a given group of exposure factors - determined by kV (decreasing makes more of an effect)
Term
Slow II screen speed
-affect and use
Definition
-200
-give better detail
-good for extremities
-increase recorded detail
- increase dose
Term
faster II screen speed
Definition
400
- used for thinker, denser structures, children
-lower exposure factors
Term
II screens
- contrast and density affect
Definition
-directly related to density
- no affect on contrast
Term
Grid ratio
-contrast and density
Definition
-inversely related to density
-directly related to contrast
Term
minimum response/reaction time
Definition
length of shortest exposure possible with a particular AEC
Term

AEC

error: terminating exposure too soon

-cause

Definition

-tissue of less density than the one of interest is center over sensor or photocell

-sensor is not completely covered

 

Term

AEC

exposure terminates to late causing overexposure

- cause

Definition
tissue of greater density is centered over photocell/chamber
Term

AEC

adjusting exposure factor

Definition

mAs can be adjusted by using master density control :plus/minus density, body habitus control, or measuring

- if overexposed because of an exposure shorter then minimum reaction time use lower mA station

Supporting users have an ad free experience!