MPHY501 - What is sensitivity and specificity

Home work MPHY 501 Lecture 2 Page 4

What is sensitivity and specificity, how are they similar how are they different and do the depend on each other and if yes how?

How is noise related to film grain?

In x-ray imaging what do we mean by “Noise” what are the sources of Noise?

How is a digital detector’s many dxel Corrected in order to obtain a “Flat Field”?

What is ment by Anatomical Noise and how is it corrected?

How does Quantum Noise play a Role?

Define the “Mean” & define the terms of your equation.

Define “Variance” & define the terms of your equation.

Define “Standard Deviation” & define the terms of your equation.

Write the function of the Normal Distribution

How much information or “data” is within one standard deviation from the Mean?

Home work MPHY 501 Lecture 2 Page 5

What is the standard deviation in “high counting statistics”?

Write out the equation for the “Noise Power Spectrum” define the terms.

What is the contrast to noise ration given a background signal “bg” and an object signal “A”.

Define Window and Level with respect to how a LUT is determined.

Write out the formula for Signal to Noise

What is the Rose Criterion?

Can smoothing out an image give better contrast and better resolution?

How is detector quantum efficiency determined?

Disambiguate DQE from QDE

What are Receive operating characteristic curves used for?

Write out the Truth Table

Define TPF, TNF, FPF, FNF and Accuracy.

Home work MPHY 501 Lecture 2 Page 6

Write out the equation for and define in your own words: Positive predictive value

Write out the equation for and define in your own words: Negative predictive value

Explain how to use the ROC in your own words.