Findings GW Flashcards
Normal thyroid uptake
4-6 hours: 6-18%
24 hours: 10-35%%
- hypothyroidism: below 5%
- hyperthyroidism: above 35%
Rim sign
Severe, gangrenous, acute cholecystitis
Normal GBEF
Over 35%
Abnormal GBEF
<35% indicates acalculus cholecystitis
Non visualization of gallbladder after morphine or after delayed imaging (you never see it)
Cystic duct obstruction (acute cholecystitis)
Delayed visualization of the gallbladder (you see it later)
Chronic cholecystitis
Non visualization of small bowel or delayed biliary to bowel transit time
Common bile duct obstruction
Renal uptake on Ga67 infection scan
Renal activity visualized within first 24 hours, any visualization after that is indicative of disease
Can increase Ga67 concentration in the skeleton
Blood transfusions, chemotherapy, iron therapy
Decreased Ga67 uptake can be caused by
MRI gadolinium contrast 24 hours prior to
Normal biodistribution for Ga67
Nasopharynx, lacrimal glands, salivary glands, bony thorax (ribs, sternum, clavicle, scapulae), penis, liver, kidneys, colon contents, and pelvis, epiphyses in peds
Platelets tagged along with WBCs will result in a false ____
False positive
Normal biodistribution for In111 labeled WBCs
Spleen
Liver
Bone marrow
(In order of intensity)
Normal plasma amount
3-6 L
Kidneys on HIDA
Increased bilirubin levels
Biodistribution % of sulfur colloid
85% in liver
10% in spleen
Remainder in bone marrow
Single of multiple cold spots on liver
Tumors, cysts, abscesses
Decreased or uneven uptake throughout the liver
Diffuse liver disease - cirrhosis and hepatitis
Severe cases show colloid shift
Colloid shift
Visualization of bone marrow and spleen more so than liver
Non visualization of gallbladder after morphine is given (or never seeing gallbladder in delays)
Acute cholecystitis, usually associated with cystic duct obstruction
Negative biliary atresia/phenobarbital scan
Nonobstructive causes of neonatal jaundice demonstrate excretion of tracer into bowel by 24 hours
Positive biliary atresia
Tracer will never be excreted into the bowl
Normal distribution for HIDA
See hepatic ducts and GB by 15-30 minutes
See GB by 45-60 minutes
See small bowel by 30 minutes
Abnormal findings on HIDA
<35% GBEF = acalculous cholecystitis
No visualization of gallbladder = acute cholecystitis
Delayed visualization of gallbladder = chronic cholecystitis
No visualization of small intestines = common bile duct obstruction
Bile leak
Liver hemangioma positive
Decreased or normal perfusion on flow, increased uptake on delays
What scan is almost 100% accurate
Tc99m labeled RBCs liver hemangioma detection
Positive Meckels is seen how long after injection
10-15 minutes
Tc labeled RBC uptake for GI bleed
Liver, spleen, abdominal vessels, kidneys, bladder, genital organs, stomach
Positive GI bleed with sulfur colloid will be visualized when
5 mins after injection
Abnormal uptake in salivary gland imaging
Metastatic disease - areas of decreased uptake
Warthins tumor - increased uptake
Benign tumors, cysts - cold spots
Sjorgen - asymmetrical arrival tracer or delayed uptake compared to thyroid, suppressed response to lemon
Breath test results
- Negative: <50 dpm
- Interdeterminate: 50-199 dpm
- Positive: >199 dpm or anything 4x background or greater
Retention of Xe after 2-3 or washout may indicate
Obstructive lung disease
Decreased or absent tracer on aerosol ventilation mean
Segments of lungs not ventilated
% lung function perfusion of each lung
Right lung 55%
Left lung 45%
Normal radioiodine uptake outside of thyroid
Salivary glands, stomach, bladder
Normal hematocrit red cell volume
35-48%
