Quality Control for Film Processing

A step wedge is used to evaluate the radiograph/development system. Expose multiple films at small dog technique. Every other day, process one film. Ten steps should be discernable. If the steps can't be clearly seen, usually the processing chemicals are exhausted and need changing.


Step wedge used to make exposures to examine the radiograph production and developing process.
 


New chemicals - Observe 10 steps
 

Exhausted chemicals - Note blurred steps.
 

Positioning Errors


Elongated image. Too little vertical angle of tube head.
 

Foreshortened image from too much vertical angulation
 

Processing Errors


Poor contrast. Too little time in fixer.
 

Same film processed normally.
 


"Frosty" coating on film from fixer remaining on film (need to wash better).
 

Exposure Techniques Errors


Image too dark. Possible causes include too high kV, too long in developer, or developing solution too warm.
 

Patient motion and scratch defect
 


Dots on side. Back rather than front of cassette exposed.
 


Double exposure. Molar exposed on top of incisors.
 

Table of Contents
Smile Book II
Dental Radiology
(1998)
Jan Bellows, D.V.M. Diplomate, American Veterinary Dental College
Introduction
About the Author
Section 1: Getting Started - The Tools
 
The Radiograph Machine
 
The Film
 
The Film Dot
 
Positioning
 
Film Processing
 
Trouble Shooting Dental Film
Section 2: Getting Started - What to Look For
Section 3: Identifying Possible Problems
Section 4: Aids for Explaining Radiology to Clients

Check out the entire
Smile Book Series

 



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Jan Bellows, DVM
All Pets Dental Clinic
17100 Arvida Parkway
Weston, FL 33326
(954) 349-5800
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