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47 Cards in this Set
- Front
- Back
Gamma camera QC check with collimator? What type of source?
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1) extrinsic uniformity (flood)
2) cobalt sheet source |
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Gamera camera QC check without collimator? What type of source?
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1) intrinsic uniformity (flood)
2) Tc-99m point source |
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DDx for "tram track" in the cortex on bone scan?
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1) hypertrophic osteoarthropathy
2) shin splints 3) venous insufficiency |
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How do you look for free Tc-99m in a dose?
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thin layer chromatography
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When do you decrease the dose of MAA in a VQ scan?
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1) pregnant women
2) suspected R to L shunt 3) children 4) pulm HTN 5) known PE? |
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DDx for a superscan?
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1) metastatic disease (prostate)
2) renal failure (secondary hyperparathyroidism) 3) Paget's disease 4) osteopetrosis 5) myelofibrosis |
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Increased activity and osseous expansion on bone scan ddx (children)?
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1) Ewing's
2) fibrous dysplasia 3) lymphoma |
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Increased activity and osseous expansion on bone scan ddx (adults)
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1) Paget's
2) mets |
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DDx for positive 3 phase bone scan?
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1) fracture
2) infection 3) bone tumor (including osteoid osteomas) 4) RSD |
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DDx for non-visualization of gallbladder on biliary scan?
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1) acute cholecystitis
2) hepatocellular disease 3) high grade biliary obstruction 4) inadequate pt preparation (recent meal, prolonged fasting) |
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What 3 drugs can be given before a Meckel's scan to increase sensitivity?
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1) pentagastrin
2) cimetidine 3) glucagon |
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DDx for a positive Meckel's scan?
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1) Meckel tic
2) urinary tracer excretion 3) intra-abdominal infectious/inflammatory processes |
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What is the dose of phenobarbitol before a biliary scan to look for biliary atresia?
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5 mg/kg for 5 days
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False positive on a parathyroid sestamibi scan?
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thyroid adenoma/cancer
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Preferred method for RBC tagging on bleeding scan?
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in vitro
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Benefit of sulfur colloid over tagged RBC for bleeding scan?
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shorter preparation time
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Frontal lobe hypometabolism on brain PET ddx?
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1) Pick's disease
2) depression 3) schizophrenia |
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DDx for unilateral absent lung perfusion?
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1) massive PE
2) tumor 3) fibrosing mediastinitis 4) post-surgical or congenital |
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What medication can cause a false-positive b/l renal impairment curve on MAG-3 imaging?
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calcium channel blockers
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Most sensitive cancer found with ostreoscan?
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gastrinoma
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False positives found with ostreoscan?
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1) granulomatous disease (most common)
2) lymphoma 3) meningioma 4) astrocytoma 5) breast cancer |
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"Trident sign" found on Tc99m HMPAO brain scan?
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Normal!
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What is the purpose of pre-therapy I-123 or I-131 whole body scanning?
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1) identify residual thyroid tissue
2) look for mets |
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What is the physiologic pattern of I-123 or I-131?
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1) salivary glands
2) stomach 3) intestines 4) urinary bladder 5) esophagus (from swallowed radioactive saliva) |
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Diffuse lung activity on a gallium scan indicates what disease?
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PCP
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Which cancer is typically negative on gallium imaging?
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Kaposi sarcoma
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DDx for hot spot on sulfur colloid hepatic imaging?
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1) FNH
2) regenerating nodules 3) Budd-Chiari syndrome |
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DDx for cold spot on sulfur colloid hepatic imaging?
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1) hemangioma
2) adenoma/HCC 3) mets 4) abscess 5) FNH (1/3 are photopenic) |
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What is sincalide used for in biliary imaging?
Dose? |
1) to induce GB contraction so that it empties, allowing agent to fill in.
2) 0.02 mcg/kg, infused SLOWLY |
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What are some processes that will cause increased FDG on PET?
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1) tumor
2) infection 3) post-operative inflammation 4) post-radiation changes (3-4 months) 5) granulomatous diseases (sarcoid, fungal, etc) |
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What are 4 characteristic uptake patterns of Galium imaging?
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1) bone
2) soft tissue 3) liver > spleen 4) bowel |
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What do you give to block thyroid uptake on I-123 MIBG scans?
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Lugol's solution
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What types of tumors can be imaged with octreoscan?
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1) carcinoid
2) islet cell tumors 3) neuroblastoma 4) paraganglioma (pheo) |
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What is one caveat to using In tagged WBCs to look for IBD?
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Must image early. Peristalsis can make localization inaccurate.
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On cardiac imaging, when is a reversible defect not related to ischemia?
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Septal defect in patients with LBBB, stressed with exercise.
That's why people with LBBB are stressed only pharmacologically. |
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What presents with "tram track" uptake diffusely on bone scan?
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hypertrophic osteoarthropathy
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Which tumors can create "cold" lesions on bone scan?
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1) myeloma
2) thyroid mets 3) renal cell ca mets |
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What agent can show tubular back perfusion on renal transplant imaging?
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DTPA.
sign of ATN |
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What is the dose limit to the public?
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1 mSv
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How many mSv are in 1 rem?
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10 mSv = 1 rem
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What procedure do you follow for a minor spill?
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1) clean up spill with absorbent paper and gloves on.
2) survey the area 3) remove contaminated clothing 4) wash clothes 5) report spill to RSO |
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What procedure do you follow for a major spill?
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1) call RSO
2) Do not clean up. Clear and secure the area. 3) Potentially shield/decontaminate personnel |
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What is the dose to the thyroid during radioactive iodine ablation?
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10,000 rad (100 Gy)
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What is the mechanism of action of MIBG?
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incorporates itself into the norepinephrine synthesis pathway.
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What part of the RBC is "tagged" in a bleeding scan?
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beta chain of hemoglobin
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How long does a patient need to stop breastfeeding after receiving 2 mcCi of I-131?
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forever
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What is the normal distribution of ostreotide scans?
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1) liver
2) spleen 3) kidneys 4) bowel (early) |