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66 Cards in this Set
- Front
- Back
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Capilliaries are what size |
7-10um |
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What is the most common indication for a lung scan |
PE (pulmonary embolism ) |
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What does PE look like on a CXR (chest x-ray) |
Wedge shaped |
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D-dimer |
Is a test that is a marker of blood clotting activity but is not diagnostic of VTE |
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Particle size range |
10-90um |
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What happens if particles are smaller than they should be.... |
They will go straight to the liver and or spleen |
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Quantum mottle |
Blotchy appearence that causes the image to look fuzzy...when too few particles are given |
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Why does xenon sink to the floor |
B/c it is heavier than air |
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Classic "mismatch" |
Normal vent, abnormal perfusion (seen in pe) |
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"Matched" defects |
abnormal vent & perfusion (can be seen in lung CA, pneumonia, pulmonary infarction ) |
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O2 flow rate |
10L/min |
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Geometric mean |
The sq. Root of the product of the anterior and posterior counts (used to estimate counts) |
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Split crystal |
Quantificated lung study ..."old school" efor having both lungs in the field of view |
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Split crystal ratio |
R55/L45 |
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FUO (fever of unknown orgin) |
Fever lasting minimum of 3weeks |
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Infection |
Invasion of living tissue by pathogens |
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What do u see more in Ga67 liver or spleen |
Liver |
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Safety factor of |
Less than 1% (1000/1) |
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Ischemia |
Dec in blood flow ST depression |
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J point |
QRS meets ST wave helps determine elevation or depression |
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P wave |
Atrial contraction "depolarization" |
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QRS complex |
Represents depolarization of the ventricles |
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Low pass filters |
Removes high frequency data ---> reducing noise &image resolution = lacks high res. Details--->too smooth |
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High pass filters "ramp" |
Reduces blur in the image by retaining high freq. --> you preserve the spatial resolution & noise but decrease the smoothing of the images produced |
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ST elevation |
Infarction or could indicate recent injury |
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Nitroglycerin |
Like a vasodilator it dialates the patients blood vessels...usually a patch on the patient DO NOT REMOVE |
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Very sensitive collimator |
Low resolution |
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Very high resolution |
Low sensitivity |
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Voxel |
Picture element with depth....2D pixel volume element |
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Viability study |
Looking for infarcted area to fill in or redistribute |
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Propanolol |
Beta blocker that should not interfere with I123 thyroid uptake study |
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Bruce protocol |
10-22%...max ♡R 220-age |
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Modified bruce protocol |
0-22% ..max ♡ rate of 120 |
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What happens if you incorrectly subtract too much bkg when analyzing a MUGA study the calculated EF will be |
falsely overestimated |
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Will a caudal tilt on a 45° LAO gared equilibrium blood pool help to separate the ventricles from each other or the atria |
Atria |
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Give an example of a ramp filter |
High pass filter |
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An insufficient #of views |
Radial streaking |
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Most important thing in degrading SPECT |
The distance from the camera |
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Reinjection technique used in some Tl201 studies is intended to demonstrate ______ |
Late reversibility |
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What is the main difference between Tl201 thallous chloride and 99mTc mibi |
Higher photon flux with 99mTc |
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EF formula |
EDV-ESV / EDV |
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What does the SA node do |
Initiates the heart beat and produces contraction of the atrial musculature |
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Uncorrected flood field uniformities cause circular or stared shaped artifacts in tomographic reconstruction |
Circular |
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Which view displays slice images from basal pprtion of the heart to the apex of the L.ventricle |
Short axis |
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Optimal imaging time for localizing an infarct w/pyrophosphate 99mTc is ______after onset symptoms |
24-48hrs |
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A false neg on a myocardial stress study are usually caused by___ |
Failure of the pt. To reach maximum stress |
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Butterworth filter w/ low cutoff is better suited for use in studies where more emphasis is on ____ |
Smoothing of images |
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Systole |
Contraction or squeezing (top # of BP) |
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Diastole |
Relaxation or filling (bottom # of BP ) |
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Ef of the ♥ |
Is the % of bloid forced out of the ♥ |
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Cardiac output |
Amt of blood ejected from the L.ventricle into the systemic circulation or from the Rt. ventricle into the pulmonary circulation, over 1min |
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Normal ♡ rate |
60-100 BPM OR 60-80 |
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Stroke volume |
Amt. Of bloid ejected in a single beat expressed in mL normal:80-100mL |
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Cardiac index |
Measures the ability of the pts ♥ to pump effectively |
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Arrhythmia |
Irregular rhythm |
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Asytoly |
Flat line |
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Vertical long axis |
From septum to lateral wall (coronal image) |
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What is CT used for ? |
Attenuation correction ...it reduces artifacts from the diaphram and breast |
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Tl201 is used for what ? |
Stress test..do stress 1st then rest |
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Tl201 1/2 life and decay |
73 hours ....electron capture |
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Cardiogen-82 & dose |
Rubidium82 and dose =40-60mCi |
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Tetrofosmin "myoview" |
Clears more quickly from the liver than mibi...and allows for earlier imaging and thus greater output |
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Persantine |
Dipyridamole=indirect coronary artery vasodilator |
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Adenosine |
Is directly vasodilator |
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Dobutamine |
Catecholamine that inc the ♥ rate ..inject every 3min until target ♡rate is reached -->radiotracer is injected at peak of ♡ rate |
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Regadenoson |
Lexiscan has 3 1/2 lives ...2-4mins,30min,2hrs |
