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41 Cards in this Set
- Front
- Back
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Thallium T 1/2
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73 hours
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Thallium imaging windows used?
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20% window at 69-83 keV & 20% window at 167 keV
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Peak myocaridal uptake time for thallium?
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10 minutes
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What is the imaging time after injection for Thallium Stress?
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10 minutes
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What is the imaging time after injection for Thallium Rest?
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3-4 hours
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What is the imaging time after injection for Sestamibi
Stress? |
15-30 mins
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What is the imaging time after injection for Sestamibi Rest>?
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30-90 minutes
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What is the imaging time after injection for Tetrofosmin Stress?
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5-15 minutes
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What is the imaging time after injection for Tetrofosmin Rest?
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30 minutes
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Thallium Dose?
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111-120 MBq
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Mibi/Tetro 1 day rest dose?
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370 MBQ
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Mibi/Tetro 1 day stress dose?
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1110 MBq
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Mibi/Tetro 2 day rest and stress dose?
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1110 MBq
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Why must patients fast 4-6 hours before exercise stress?
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To minimize splanchnic blood distribution and to reduce gastric distress.
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What does the LAD diffuse?
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Septum & Anterior wall
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LCX
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Lateral and posterior
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RCA
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Right Ventricle, Inferior wall, some septum.
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What method of stress results in increased liver activity?
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Adenosine & Dipyridamole
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How is ischemia noted?
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Cold defects on post-stress images that fill in on delayed images
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How is infarction noted?
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Defects on rest and stress perfusion.
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What is Transmural Infarction?
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Necrosis that involves all layers from endocardium to epicardium
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What is subendocardial infarction?
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Necrosis involving only the muscle adjacent to endocardium
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How does myocardial Scar appear on scan?
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Photon Deficent
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When is cardiac creep most probable
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Thalium excercise stress
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On stress imaging how much precentage of occlusion must there be?
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> 50 -70%
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On rest images how much occlusion must there be to show perfusion defects?
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> 85 - 90%
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What is stunned myocardium?
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Transient loss of wall motion due to acute loss of BF
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What is CAD?
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Decrease in blood flow to the heart due to atherosclerotic plaque or occlusive thrombus/embolism
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How do drugs reduce plaque size?
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1. reducing the lipids in to the plaque, and
2. increasing the lipids out of the plaque, thereby 3. limiting the number of macrophages present – |
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What pathological conditions will make it easier to see the ischemic myocardium?
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-when one vessel is affected significantly more than the others
-when two vessels “watersheds” affect the same portion of myocardium |
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What is the purpose of the citrate solution in syringe II of the Ultratag kit?
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Sequesters excess extracellular stannous ion
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What is an advantage of a slant hole collimator?
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Ability to acquire oblique image while optimizing distance from detector
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Separating the right ventricle from the right atria is accomplished by:
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Performing caudal tilt
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Which view best displays the posterior wall of the heart?
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RPO
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What is the purpose of Fourier Transformation of MUGA data?
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To produce phase and amplitude images
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Dyskinetic refers to?
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Motion in the opposite direction
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What is hibernating Myocardium?
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Result of hypoperfusion and ischemia. Leading to reduced cellular metabolism that is enough to sustain viability but not adequate enough to permit contractile function.
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How does hibernating myocardium present?
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Segments of decreased perfusion and absent of diminished contractility.
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What is stunned myocardium?
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Result of ischemic and reperfusion injury secondary to an acute coronary artery occlusion that has reopened before significant myocardial infarction.
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HOw does stunned myocardium present?
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Normal or near-normal perfusion but with absent or diminished contractilit
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?What artifact may be caused by LBBB?
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A reversible septal defect mimicking ischemia
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