Podcast
Questions and Answers
What is the primary advantage of using Tc99m-labeled RBCs in GI bleeding detection?
What is the primary advantage of using Tc99m-labeled RBCs in GI bleeding detection?
- They provide immediate results within 5 minutes.
- They have a long blood pool retention time, allowing for delayed imaging. (correct)
- They can easily visualize the liver and kidneys simultaneously.
- They are more effective than sulfur colloid in all cases of bleeding.
Which imaging method may obscure bleeding in the right upper quadrant during GI bleeding detection?
Which imaging method may obscure bleeding in the right upper quadrant during GI bleeding detection?
- CT scans
- Tc99m-labeled RBCs
- MRI imaging
- Tc99m-sulfur colloid (correct)
How should patients be positioned during the imaging process for GI bleeding detection?
How should patients be positioned during the imaging process for GI bleeding detection?
- Lying on one side with a pillow under their head
- Supine position with the abdomen centered in the field of view (correct)
- Sitting upright with arms extended
- Prone position with legs elevated
What is indicated by progressive tracer accumulation in the imaging results?
What is indicated by progressive tracer accumulation in the imaging results?
What is the maximum time interval for acquiring short static images after tracer administration during GI bleeding imaging?
What is the maximum time interval for acquiring short static images after tracer administration during GI bleeding imaging?
Flashcards
GI Bleeding Detection
GI Bleeding Detection
A nuclear medicine test using tracer agents like Tc99m-sulfur colloid or Tc99m-labeled RBCs to detect bleeding in the gastrointestinal tract.
Tc99m-sulfur colloid
Tc99m-sulfur colloid
A tracer used in GI bleeding detection, best for active bleeding, but can be obscured in the liver area.
Tc99m-labeled RBCs
Tc99m-labeled RBCs
A tracer used in GI bleeding detection, useful for intermittent bleeding due to its long blood pool retention time.
Patient Positioning for GI Bleeding Detection
Patient Positioning for GI Bleeding Detection
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Image Acquisition for GI Bleeding Detection
Image Acquisition for GI Bleeding Detection
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Study Notes
GI Bleeding Detection
- Detection methods include Tc99m-sulfur colloid or Tc99m-labeled RBCs.
- Sulfur colloid is best for active bleeding, but liver uptake can mask bleeding in the right upper quadrant.
- Labeled RBCs are better for intermittent bleeding due to longer blood pool retention.
Imaging Protocol
- Patient position is supine, abdomen centered.
- Rapid sequential images are taken during tracer injection, followed by static images every few minutes for up to 90 minutes.
- Dynamic images are shown in cine format.
Image Findings
- Normal findings include visualization of liver, spleen, vessels, kidneys, bladder, genitals, and stomach.
- Bleeding site identification is indicated by progressive tracer accumulation in areas besides the normal organs.
- Active bleeding can be detected within 5 minutes using Tc99m-sulfur colloid.
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