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Chrisna Ngoun

Bringing STEM Education to Local High School

Chrisna Nguon, currently a masterâ€™s student, has completed his first year of the NSF GK-12 fellowship. Under the fellowship, Chrisna has been working with Gardner High School bringing resources and experience from the university setting to the high school classroom. Specifically, he is involved in physics and environmental science classes, teaching students computing concepts with the R programming language. The concepts the students learn are then applied to data visualization and analysis during lab experiments in class. Chrisna has also presented and developed short lessons on his research to the high school students. His research topic involves the computation of the acoustic scattering at the difference-frequency generated from the nonlinear interaction of two high-frequency beams.

Ayse Kalkan-Savoy, PhD

Strain measurement in an ultrasound simulation framework

The study focuses on the improvement of ultrasound simulation and image data generation and the development of an accurate strain measurement algorithm. An ultrasound simulation is developed modeling a two-dimensional ultrasound imaging system and the media of scatterers. The time domain point spread function that is used to model the imaging system is based on a novel spatial impulse algorithm. The spatial impulse response and the point spread function are parallel algorithms and their computation runs on GPUs. The ultrasound simulation results are generated for an object under stress. A strain measurement algorithm to track clusters of speckles is developed. Following the Lagrangian approach, this algorithm computes the transformation matrix between the initial and deformed states, and it is based on the statistical relation between the coordinates of speckles of each frame rather than the displacement measurement of a small number of speckles in a region of interest using correlation. Because the algorithm does not depend on searching the pattern in the next image of the sequence, larger deformation quantities can be measured accurately.

- Chrisna Nguon, NSF GK-12 Fellow

- Ayse Kalkan-Savoy, awarded PhD