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14 Cards in this Set
- Front
- Back
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What can be use to measure: 1) LV function 2) RV function 3) L to R shunt |
1) First pass (rest/stress), Planar R wave gated (MUGA,ERNA, GBPS, RVG) (rest/stress), SPECT ERNA 2) First pass (rest/stress), SPECT ERNA (better) 3) First pass (rest/stress) |
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What are three views for LV imaging |
Start best septal view, anterior view, lateral view |
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What is best view for RV imaging |
Not optimal but 20 degree LAO view separates RV from RA and LV |
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How is in vivo method done?
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2-3 mg Stannous pyrophosphate, wait 15 minutes 99mTc Sodium Pertechnetate, wait 15 minutes Image 75-85% labeling efficiency |
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How is modified in vitro done? |
Stannous pyrophosphate 2-3mg, wait 15 minutes Heparinized syring with Na pertechnitate, pull 5-10cc blood sample, wait 15 min and then reinject Wait 1 minute, then image 90-95% labeling efficiency |
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How is in vitro labeling done |
Commercial kit- Ultratag, 1-3 cc blood drawn Put in rxn vial - contains stannous pyrophosphate Then Na pertechnitate Then 99MTc Reinject and image 95%+ efficiency |
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Which ERNA labeling is safest? |
In Vivo, in case put blood of different patient in blood |
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What causes poor RBC labeling? What causes oxidation of Stannous ion Induces RBC Ab |
1) prazosin, digoxin 2) hydralazine, heparin, methyldopa 3) methyldopa, PCN, quinidine, immune d/o |
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1) What mCi used 2) Which collimator 3) How many frames /cycle 4) How many counts/frame 5) What % window 6) What bad beat rejection 7) What zoom/pixel size desired |
1) 20-25mCi 2) LEHR for rest only 3) 24-32 frames/cycle 4) 200,000 counts/frame 5) 20% window 6) 10-15% beat length window 7) Large FOV, 1.5-2 zoom, pixel size < 4mm |
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What changes for peak exercise imaging? 1) mCI 2) collimator 3) acquisition reduced to what 4) Position of camera |
1) 25-35mCi 2) LEHR change to LEAP 3) 2-3 minutes acquistion 4) Perform rest LAO last, maintain position for exercise |
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What is equation for LVEF |
(EDV cts - ESV cts) / (EDV cts - background cts) |
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Where should background be drawn? |
3-5 O'clock. If hot area (lung/aorta/spleen) - makes EF high If false low area - makes EF low |
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How is gated blood pool SPECT different? Tracer? Collimator? Degrees? Stops? Seconds? Frames/cycle?, window? Why rest only? |
Higher tracer 25-35 mCi 99mTc-RBC High resolution collimator Projection every 3 degrees - 180 degrees with 60-64 stops, 25-30 seconds Min 16 frames/cycle, 20% window Rest only imaging (20 minute acquisition) |
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What filter use? |
Butterworth filter Cutoff = 0.55, Order 7 |
