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BLADDER

The primary excretory route of Tc99m HDP is the kidneys.  The accumulation of Tc99m HDP in the urinary bladder shifts the target to background ratio.  If a significant shift occurs the visualization of bone (target) could be compromised rendering the image non-diagnostic. Fifty percent of the injected dose of Tc99m HDP is excreted in the first urination, however, re-accumulation of isotope may dwell in the urinary bladder causing artifacts in the image.  One could ask the horse to empty his bladder before imaging or administer a dose of Lasix at least forty-five minutes prior to scanning.   Which ever works best. Multiple views and the use of a bladder blocker will usually resolve any doubts.
EXAMPLE 1

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EXAMPLE 2
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EXAMPLE 3
This horse was sent back to the stall until micturation, then returned for reimaging. Many artifacts caused by the urinary bladder are detected in the left hemisphere since the bladder tends to situate slightly left lateral to the mid line.                       space3px.gif (50 bytes)
EXAMPLE 4
Repositioning of the detector and using a lead blocker drastically improves this image. 

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Copyright 2001 University of Pennsylvania School of Veterinary Medicine
Faculty Sponsor: Dr. Michael W. Ross
Technologist: Vivian S. Stacy CNMT
Comments and suggestions to vstacy@vet.upenn.edu