hippocampus {polykde} | R Documentation |
Skeletal representation of hippocampus shapes
Description
Contains skeletal representations (s-reps) for the hippocampus
shapes of 177
6-month-old infants. The s-reps models include 168
spokes, and hence the directions of the spokes form a sample on the
polysphere (\mathcal{S}^2)^{168}
. There are 34
infants that
later developed autism.
Usage
hippocampus
Format
A list with six fields:
- base
an array of size
c(177, 168, 3)
with the coordinates of the base points.- bdry
an array of size
c(177, 168, 3)
with the coordinates of the boundary points.- dirs
an array of size
c(177, 168, 3)
with the directions of spokes (unit vectors).- rads
a matrix of size
c(177, 168)
with the radii of the spokes.- ids
hippocampi identifiers.
- ids_labs
class labels.
TRUE
stands for infants that developed autism andFALSE
for those that did not.
Source
The fitted s-reps data was shared by Prof. Stephen M. Pizer and Dr. Zhiyuan Liu, see Liu et al. (2021) and the repository https://github.com/ZhiyLiu/shanapy. The source for the raw hippocampi data is the Infant Brain Imaging Study (IBIS) network.
References
Liu, Z., Hong, J., Vicory, J., Damon, J. N. and Pizer, S. M. (2021). Fitting unbranching skeletal structures to objects. Medical Image Analysis, 70:102020. doi:10.1016/j.media.2021.102020
Examples
# Load data
data("hippocampus")
attach(hippocampus)
# View ith hippocampus s-rep
i <- 50
view_srep(base = base[i, , ], dirs = dirs[i, , ], bdry = bdry[i, , ])