Term
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Definition
| System tests are needed to make certain that there has been no degradation in system performance over time. |
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Term
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Definition
| Transducers are the most likely part to degrade or break. |
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Term
| Doppler Testing Phantoms (3) |
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Definition
1.Flow Phantoms
2.String Phantoms
3.Vibrating Plate Phantoms |
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Term
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Definition
| 1.Imaging Face 2.Medium 3.Flow Conduit 4.Pump 5.Reservoir 6.Blood Mimicking Fluid(hardest). |
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Term
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Definition
| Used to measure peak velocity, spectral broadening,depth accuracy and gate size in PW Doppler. Not good for Doppler sensitivity. |
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Term
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Definition
| Aka: Sensitivity Phantom. Measures accuracy of velocity readings by vibrating a plate. |
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Term
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Definition
Test: 1.Detail Resolution 2.Sensitivity
3.Contrast Resolution 4.Dead Zone 5.Dimensional Measurement Accuracy(depth,diameter,area,volume,etc.) |
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Term
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Definition
| For the purposes of the statistical indices, the assumption is that the gold standard is perfect. The definition of truth. |
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Term
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Definition
| (TP): The test correctly predicts that there is disease. Test and Gold Standard match. |
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Term
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Definition
| TN: The test correctly predicts that there is no disease. Test and Gold Standard match. |
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Term
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Definition
| FP: The test incorrectly predicts there is disease. Test and Gold Standard don't match. |
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Term
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Definition
| FN: The test incorrectly predicts that there is no disease. Test and Gold Standard don't match. |
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Term
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Definition
| True Positive + False Negative |
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Term
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Definition
| False Positive + True Negative |
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Term
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Definition
| True Positive + False Positive |
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Term
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Definition
| False Negative + True Negative |
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Term
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Definition
| The ability of a test to detect disease. TP/TP+FN |
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Term
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Definition
| The ability of a test to detect the absence of disease. TN/TN+FP |
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Term
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Definition
| The percentage of time the test is correct. TP+TN/∑ All Tests |
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Term
| Positive Predictive Value |
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Definition
| PPV: The percentage of times the test was correct when it predicted the presence of disease. TP/TP+FP |
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Term
| Negative Predictive Value |
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Definition
| NPV: The percentage of times the test was correct when it predicted the absence of disease. TN/TN+FN |
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Term
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Definition
| The Test perfectly matches the Gold Standard. 100% |
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Term
| Real World Understanding of Stats. |
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Definition
1.No guarantee that the Gold Standard is always correct.
2."Good" match to a good standard is a good test.
3."Good" match to a bad standard is a bad test.
4."Bad" match to a good standard is a bad test.
5.""Bad" match to a bad standard doesn't tell much. |
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Term
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Definition
| Stored Energy; the ability to do work. |
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Term
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Definition
| Energy related to motion; proportional to v^2. |
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Term
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Definition
| Energy is always conserved, never lost, only converted between forms. |
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Term
| Flow Converion between PE & KE |
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Definition
As flow speeds up PE into KE
As flow slows down KE into PE |
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Term
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Definition
| The pressue that results from the force of the fluid from a column of fluid. p=ρgh. 2mmHg/inch or .776mmHg/cm |
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Term
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Definition
Change in volume/time.
Δv/Δt |
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Term
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Definition
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Term
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Definition
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Term
| Radius (Area) & Resistance |
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Definition
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Term
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Definition
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Term
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Definition
|
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Term
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Definition
|
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Term
| Volumetric Flow & Velocity |
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Definition
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Term
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Definition
Aka: Volumetric Flow Equation
Q=v*Area |
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Term
| Simplified Law of Hemodynamics |
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Definition
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Term
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Definition
Relates Pressure and Flow
Q=ΔPπr^4/8lη
Assumes: Steady-State Flow, Rigid Flow Conduits and Newtonian Fluids. Which doesn't happen in the body. |
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Term
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Definition
Deals with Energy and Flow
ΔP≈4(v{2}^2) or if v{1} is ≥ 1m/sec.
then use ΔP≈4(v{2}^2-v{1}^2). |
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Term
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Definition
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Term
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Definition
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Term
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Definition
1/R(eff)=1/R(1)+1/R(2)
R(eff)=R/2 |
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Term
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Definition
| Nonlaminar flow due to stenosis. |
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Term
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Definition
| Add series and parallel resistance together. |
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Term
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Definition
| Venous System. 65-70% of blood stored in the venous system. |
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Term
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Definition
1st:Arterioles
2nd:Capillaries |
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Term
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Definition
Pressure across the wall; looks from inside to out.
Intravascular Pressure High: High Transmural Pressure
Intravascular Pressure Low: Low Transmural Pressure |
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Term
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Definition
Unitless number; predicts turbulence.
Reynold's#>2000 turbulence is likely.
Re=inertial forces/viscous forces or
Re=ρDv/η (density.diameter.velocity)/viscosity |
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