Betting on Nyquist
I placed my very first bet on a horse for today’s Kentucky Derby. I have $20 on Nyquist who is a 3-1 favorite to win. There is a confluence of connections with Nyquist that relate to my interests: hockey and MRI.
Gustav Nyquist
In the attached article you can read about the owner of the horse Nyquist and his history of naming his horses after Red Wings players. Gustav Nyquist is a young-ish (26 years old) center from Sweden, who plays for the Detroit Red Wings. Although his production dropped a bit this season, he’s still considered a pretty good player. Nyquist the horse, is slotted in the 13th position to start the race today (determined by lottery, I believe). My favorite Red Wing player is number 13, Pavel Datsyuk. Good bet so far?
Harry Nyquist
Dr. Harry Nyquist was a Swedish electrical engineer that emigrated to the USA in 1907, eventually working at Bell Labs. His contribution to science is used daily for people involved in communication systems and MRI.
The Nyquist sampling theorem states that the sampling frequency, i.e., how often you acquire the data, should be twice the frequency being sampled. The maximum frequency that you can measure is, therefore half the sampling frequency. In MRI, when the frequency of the sample is higher than the Nyquist limit, aliasing occurs. If you aren’t familiar with aliasing in imaging, it’s when undersampling causes a wrap around or fold-over artifact. See figure 15b in the review article by Morelli et al, linked below. You can also read my previous post about MRI basics to learn what k-space is and what frequency has to do with MRI.
What do you think, a good bet?
Links and references:
https://en.wikipedia.org/wiki/Harry_Nyquist
An Image-based Approach to Understanding the Physics of MR Artifacts
Radiographics. 2011 May-Jun;31(3):849-66. doi: 10.1148/rg.313105115. Review.
http://pubs.rsna.org/doi/full/10.1148/rg.313105115
Medical Imaging 101 pt 3: MRI
Good bet!
I hope so Susan Jahn.
I will root for your horse. I’m at graduation for Tyler and missing the Derby parties. 🙁
Brigitte W., you can have a mint julep later. Congratulations to Tyler.
Thanks, Chad Haney.
Daytime, Robyn Miller.
What is Nyquist’s rate?
https://en.wikipedia.org/wiki/Nyquist_rate
Tom Nathe, it seems like the same thing, except bandwidth is not the same as frequency.
Yay, Nyquist won.
Hooray! So drinks are on you?!?!
Maybe one drink, Brigitte W. I didn’t bet much.
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