Postdoctoral Fellows Seminars – Fall 2016

Introductory Talks from SAMSI Postdoctoral Fellows

September 14, 2016, 1:15pm – 2:15pm
Room 150
Speaker: Benjamin Risk, Sarah Vallelian, Zhengwu Zhang, Duy Thai, David Jones, Hyungsuk Tak, David Stenning, Ahmed Attia, Sercan Yildiz, Peter Diao

Abstract

Each of our Postdoctoral fellows will perform a short introductory talk discussing their areas of academic interest and possibly an overview of their upcoming lectures throughout the fall.

References

To Be Determined


Lecture: Spurious Activation from Multiband Acquisition fMRI

September 21, 2016, 1:15pm – 2:15pm
Room 150
Speaker: Benjamin Risk

Abstract

In fMRI, conventional pulse sequences collect two-dimensional data one slice at a time and consequently require up to six seconds to acquire the dozens of slices composing a single volume with whole-brain coverage. Multiband acquisition techniques collect multiple slices in a single shot and can be used to decrease the time between acquisition of fMRI volumes, which can increase statistical power and better characterize the temporal dynamics of the blood-oxygen level dependent
(BOLD) signal. The technique requires an additional processing step in which the slices are separated, or unaliased, to recover the whole brain volume. However, this may result in signal leakage between aliased locations and lead to spurious activation (false positives). We examine the Slice-GRAPPA algorithm for image reconstruction at different acceleration factors. We found a high incidence of spurious activation in simulations. Perversely, more time points actually increase the detection of spurious activation, such that longer acquisition times can lead to poorer estimates of activation. We also show evidence of artifacts in fMRI data from the Human Connectome Project, which uses a higher acceleration factor than most studies and thus may be more susceptible to spurious activation.

References

To Be Determined


Lecture: Title Ongoing

September 28, 2016, 1:15pm – 2:15pm
Room 150
Speaker: Sarah Vallelian

Abstract

Abstract for this talk has not been provided. Please stay tuned for more details as our event gets closer.

References

To Be Determined


Lecture: Title Ongoing

October 5, 2016, 1:15pm – 2:15pm
Room 150
Speaker: Zhengwu Zhang

Abstract

Abstract for this talk has not been provided. Please stay tuned for more details as our event gets closer.

References

To Be Determined


Lecture: Title Ongoing

October 12, 2016, 1:15pm – 2:15pm
Room 150
Speaker: Duy Thai

Abstract

Abstract for this talk has not been provided. Please stay tuned for more details as our event gets closer.

References

To Be Determined


Lecture: Title Ongoing

October 19, 2016, 1:15pm – 2:15pm
Room 150
Speaker: David Jones

Abstract

Abstract for this talk has not been provided. Please stay tuned for more details as our event gets closer.

References

To Be Determined


Lecture: Title Ongoing

October 26, 2016, 1:15pm – 2:15pm
Room 150
Speaker: Hyungsuk Tak

Abstract

Abstract for this talk has not been provided. Please stay tuned for more details as our event gets closer.

References

To Be Determined


Lecture: Title Ongoing

November 9, 2016, 1:15pm – 2:15pm
Room 150
Speaker: David Stenning

Abstract

Abstract for this talk has not been provided. Please stay tuned for more details as our event gets closer.

References

To Be Determined


Lecture: Title Ongoing

November 16, 2016, 1:15pm – 2:15pm
Room 150
Speaker: Ahmed Attia

Abstract

Abstract for this talk has not been provided. Please stay tuned for more details as our event gets closer.

References

To Be Determined


Lecture: Title Ongoing

November 30, 2016, 1:15pm – 2:15pm
Room 150
Speaker: Sercan Yildiz

Abstract

Abstract for this talk has not been provided. Please stay tuned for more details as our event gets closer.

References

To Be Determined


Lecture: Title Ongoing

December 7, 2016, 1:15pm – 2:15pm
Room 150
Speaker: Peter Diao

Abstract

Abstract for this talk has not been provided. Please stay tuned for more details as our event gets closer.

References

To Be Determined