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Author Archives: Anonymous

All phased array transducer systems direct ultrasound pulses…

All phased array transducer systems direct ultrasound pulses in the same direction to create a 2-dimensional image.

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 The overall gain improves the signal to noise ratio.

 The overall gain improves the signal to noise ratio.

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 Images that display many shades of gray are also called low…

 Images that display many shades of gray are also called low contrast.

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 How many bits are needed to represent 32 shades of gray?

 How many bits are needed to represent 32 shades of gray?

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Which component of the transducer reduces the amount of ring…

Which component of the transducer reduces the amount of ringing, making it possible to produce an image?

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 What determines the frequency of a sound beam from a pulsed…

 What determines the frequency of a sound beam from a pulsed transducer?

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A rare genetic disease occurs in 1 of 200,000 people. You li…

A rare genetic disease occurs in 1 of 200,000 people. You live in a city with a population of 800,000. What is the probability that 2 or less people with the disease live in your city?

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A scintillator counts radioactive events in an experiment to…

A scintillator counts radioactive events in an experiment to track radioactively labeled DNA. For a given concentration of the labelled DNA, we expect to observe 3 events per second on average. What is the probability to observe 2 events in a given second?

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You have an experiment that allows you to measure a value xx…

You have an experiment that allows you to measure a value xx with a standard deviation of ±5.0\pm 5.0 caused by statistical noise. How many times do you need to repeat the experiment to be able to report x±1.0x \pm 1.0 with a 95% confidence interval?

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You know the probability distribution p(x)p(x) of a random v…

You know the probability distribution p(x)p(x) of a random variable xx, which is defined in the interval a≤x≤ba \le x \le b. You are interested in a function f=f(x)f=f(x) that directly depends on the variable xx. How do you calculate the expected average result for f(x)f(x)?

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