This event has only 230 space(s) left. If you continue and register more than 230 people (including yourself ), the whole group will be wait listed. Or, you can reduce the number of people you are registering to 230 to avoid being put on the waiting list.

Math Encounters:
"3D X-Ray Vision: how tomography uses math to reveal the invisible"
featuring Samuli Siltanen 

Wednesday, February 8 at 4:00 pm ET (New York)

(in person)


Doctors peek inside patients using CT scanners, combining X-rays and mathematics to produce slice images.  How easy is it to decipher what they see?  Join mathematician Samuli Siltanen and test your own tomographer skills as you guess the image only by looking at X-ray data.  Then, learn how you can use math to more accurately identify the image... even if it’s a unicorn!

Special introduction by Jennifer Mueller, Professor Laureate in the College of Natural Sciences at Colorado State University.

This page is for the 4:00 pm ET in-person session.  Click here to register for the 7:00 pm ET session instead.

This event will take place in-person at MoMath at 11 East 26th Street.

All in-person seats are available on a first-come, first-served basis.

Please arrive 15 to 30 minutes before the event start time to complete registration.

Masks must be worn at all times inside the Museum.

By registering for a Math Encounters presentation, you acknowledge that you may be photographed or videotaped by Museum staff and associates and agree to abide by the MoMath General Policies for Events and Photograph Release.

Math Encounters is MoMath's popular free public presentation series celebrating the spectacular world of mathematics, produced with support from the Simons Foundation.

For further information, call the National Museum of Mathematics at 212-542-0566 or email

Please check our online shop for books by Math Encounters presenters.

(including yourself)
Fill in your registration information on this page. If you are registering additional people, you will be able to enter their registration information after you complete this page and click "Continue".
Participant Contact Information (in-person)

If you have previously registered for a Math Encounters presentation, please only submit your email address and the required fields below.

If you would like to register more than 10 guests, or wish to hold space for potential guests but do not yet have their names, please contact us at

Please note that Math Encounters is intended to be entertaining for a general audience, and all are welcome. Because of the educational mission of the organizations involved with Math Encounters, we'd like to understand a little about who is coming to enjoy the series.
If you are registering as part of a group from SAR High School, NYU's Center for Mathematical Talent, or Bard College, please indicate your affiliation here.
Your Registration Info
Commitment to Health & Safety (Events)
How did you hear about this program?
Commitment to Health & Safety (Events)