Suyash P. Awate Suyash P. Awate
Associate Professor
Computer Science and Engineering Department, Indian Institute of Technology (IIT) Bombay
Office: A-214, Kanwal Rekhi Building
Email: my-first-name @cse.iitb.ac.in
   
Research Publications Teaching Students CV Personal
 
Multiatlas Segmentation as Nonparametric Regression
 
Suyash P. Awate, Peihong Zhu, Ross T. Whitaker
How many templates does it take for a good segmentation?: error analysis in multiatlas segmentation as a function of database size
Int. Workshop Multimodal Brain Image Analysis (MBIA) at Int. Conf. MICCAI 2012, 2:103-114, Springer LNCS 7509
(podium presentation, Best Paper Award)

Suyash P. Awate, Ross T. Whitaker
Multiatlas Segmentation as Nonparametric Regression
IEEE Transactions on Medical Imaging (TMI) 33(9): 1803-1817 (2014)


Predicting MSE (for fixed k) as a function of database size for
(a) subcortical Structures in brain MR images and
(b) cartilages in knee MR Images (see paper).

Box-whisker plots show the empirically computed MSE values after size normalization for the number of neighbors/templates in kNN fixed to eight independent of database size. Variance depicted by the whiskers comes from the bootstrap samples of small databases available for analysis. Solid lines and associated error bars are obtained using the larger databases. Dashed lines and associated error bars show the mean and standard deviation, respectively, of the fitted MSE values using small databases . Error bars come from the bootstrap samples of databases.


Parameter values for multiatlas caudate segmentation from brain T1 MR images using small databases, indicating confidence of labels per voxel.
Images (a) and (e) show the average MR image and the average expert segmentation, respectively, in a common anatomical space.
Images (b) and (f) show the mean and standard deviation, respectively, of alpha_v, at voxel v, generated from bootstrap samples of the small databases employed for parameter estimation.
Similarly, (c) and (g) show the mean and standard deviation of and (d) and (h) show the mean and standard deviation of d_v.
 
Related Works
 
Juan Eugenio Iglesias, Mert R. Sabuncu
Multi-atlas segmentation of biomedical images: A survey
Medical Image Analysis 24(1): 205-219 (2015)