Clustered Probability Program

 

The program, cluster_prob, is a direct implementation of the following paper:

Jinhu Xiong, et al. ``Clustered Pixels Analysis for Functional MRI Activation Studies of the Human Brain'' Human Brain Mapping, 3:287-301(1995).

The program is invoked as follows:

Usage: cluster_prob clusterSize area t_val -[sld | fwhm] val

where the program command-line parameters are related to Xiong's equations as follows:

Note the clusterSize, K, is the threshold for the two-dimensional four-neighbor (2D4N) connected compoments. The parameter, val, is dependent on the switch option and can be either:

where sld is the Square-root of the Lamda Determinant as given by Xiong's equation s12 on page 301:

and is the image-space Full Width Half Maximum of the applied guassian filter. If no filtering is done, a value of 0 for should be used.

The output from the program is the evaluation of Xiong's equation 11 on page 291,

where per equation 2 on page 289:

and per equation 10 on page 291:

and per the last paragraph on page 290:

and per the first paragraph on page 291: