brede_mat_loganplot - Logan plot analysis BP = brede_mat_loganplot(M, Mref, varargin) Input: M 'Mat' structure or numerical matrix Mref 'Mat' strutcure or numerical matrix with reference value/plasma curve Property: EndIndex [ {Inf} | positive integer ] Index where the linear fitting of the Logan plot should end. Info [ {0} | value ] Amount of feedback/debug information k2prime [ {Inf} | positive value ] k'2 paramere StartIndex [ 1 | positive integer ] Index where the linear fitting of the Logan plot should start. TimingType [ end | {middle] ] Determines where the integration (cumulation) of the values in the matrix should stop when the 'Times' are given. Times 'Mat' structure with times: the first column should be the starting times of the scan while the second column should be the end time. There should be as many rows as there are rows in the M and Mref matrices. Output: BP Binding potential in a 'mat' structure Logan plot analysis is a type of kinetic modeling for dynamic PET scans. This function will estimate the binding potential. The function expects an input where the activity curve for each region/voxel is in a single column and each row correspond to a time point/period. The outputted binding potentialwill be in a single row. The linear fit is computed with points from 'StartIndex' to 'EndIndex'. The function may not estimate all voxels in a volume well. Those where it is not possible to compute a sensible binding potential value will have a NaN. A spatial smoothing with a median filter as implemented in the brede_vol_smooth function may remove these voxels. Note that this function is not properly validated. Reference: PMOD, Logan's Reference Tissue Model based on Average k2', http://pmod.com/technologies/doc/pkin/2322.htm See also BREDE, BREDE_MAT, BREDE_MAT_CUMSUM, BREDE_MAT_MRTM, BREDE_VOL_SMOOTH. $Id: brede_mat_loganplot.m,v 1.8 2008/06/10 17:12:42 fn Exp $

- brede_mat_cumsum brede_mat_cumsum - Cumulated sum
- brede_mat_mat2mat brede_mat_mat2mat - Convert or clean matrix
- brede_struct_guesstype brede_struct_guesstype - Try to guess type of structure

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