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==Introduction==
==Introduction==
Contrast procedures have been developed to '''increase the native contrast of organs''' in order to separate them from surrounding tissues. There are many situations where they can be a useful supplement to the information gained from routine radiographic examination. They can provide information on the '''size, shape and position''' of structures. They might help outline the internal structure of an organ, including its mucosal pattern, and sometimes help assess its function.
Contrast procedures have been developed to '''increase the native contrast of organs''' in order to separate them from surrounding tissues. There are many situations where they can be a useful supplement to the information gained from routine radiographic examination. They can provide information on the '''size, shape and position''' of structures. They might help outline the internal structure of an organ, including its mucosal pattern, and sometimes help assess its function.
==Dacryocystorhinography==
==Dacryocystorhinography==
This technique involves injecting a radioopaque dye through the punctum in the eye and the canaliculus, and obtaining radiographs as the dye passes through the '''nasolacrimal system'''.
Under general anaesthesia, the upper punctum is cannulated and contrast is injected until it appears from the lower punctum or external nares.
This technique outlines the nasolacrimal drainage system and can help diagnose abnormalities associated with obstructions, deviations, congenital defects and neoplasms.
It is commonly used in [[Dacryocystitis – Rabbit|'''rabbits with dacryocystitis''']].
==Contrast Studies in Horses==
==Contrast Studies in Horses==
Easton, S. (2006) '''Veterinary radiography: a workbook for students''' ''Elsevier Health Sciences''
Easton, S. (2006) '''Veterinary radiography: a workbook for students''' ''Elsevier Health Sciences''
[[Category:To Do - Helen]]
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==Webinars==
<rss max="10" highlight="none">https://www.thewebinarvet.com/diagnostic-imaging/webinars/feed</rss>
[[Category:Expert Review]]
[[Category:Clinical Techniques]]
[[Category:Clinical Techniques]]