/* MELODIC - Multivariate exploratory linear optimized decomposition into
independent components
meldata.cc - data handler / container class
Christian F. Beckmann, FMRIB Image Analysis Group
Copyright (C) 1999-2008 University of Oxford */
/* CCOPYRIGHT */
#include "newimage/newimageall.h"
#include "meloptions.h"
#include "meldata.h"
#include "melodic.h"
#include "utils/log.h"
#include <time.h>
#include "miscmaths/miscprob.h"
#include "melhlprfns.h"
using namespace Utilities;
using namespace NEWIMAGE;
namespace Melodic{
// {{{ Setup
Matrix MelodicData::process_file(string fname, int numfiles)
{
volume4D<float> RawData;
//read data
message("Reading data file " << fname << " ... ");
read_volume4D(RawData,fname);
message(" done" << endl);
del_vols(RawData,opts.dummy.value());
Mean += meanvol(RawData)/numfiles;
//reshape
Matrix tmpData;
tmpData = RawData.matrix(Mask);
//estimate smoothness
if((Resels == 0)&&(!opts.filtermode))
Resels = est_resels(RawData,Mask);
//convert to percent BOLD signal change
if(opts.pbsc.value()){
message(" Converting data to percent BOLD signal change ...");
Matrix meanimg = convert_to_pbsc(tmpData);
meanR = meanimg.Row(1);
message(" done" << endl);
}
else{
if(opts.remove_meanvol.value())
{
message(string(" Removing mean image ..."));
meanR = mean(tmpData);
tmpData = remmean(tmpData);
message(" done" << endl);
}
else meanR=ones(1,tmpData.Ncols());
}
if(opts.remove_meantc.value()){
meanC = mean(tmpData,2);
tmpData = remmean(tmpData,2);
}
//convert to power spectra
if(opts.pspec.value()){
message(" Converting data to powerspectra ...");
tmpData = calc_FFT(tmpData);
message(" done" << endl);
}
//switch dimension in case temporal ICA is required
if(opts.temporal.value()){
message(string(" Switching dimensions for temporal ICA") << endl);
tmpData = tmpData.t();
Matrix tmp;
tmp = meanC;
meanC = meanR.t();
meanR = tmp.t();
message(" Data size : " << Data.Nrows() << " x " << Data.Ncols() <<endl);
}
//variance - normalisation
if(opts.varnorm.value()){
message(" Normalising by voxel-wise variance ...");
if(stdDev.Storage()==0)
stdDev = varnorm(tmpData,std::min(30,tmpData.Nrows()-1),
opts.vn_level.value())/numfiles;
else
stdDev += varnorm(tmpData,std::min(30,tmpData.Nrows()-1),
opts.vn_level.value())/numfiles;
stdDevi = pow(stdDev,-1);
message(" done" << endl);
}
return tmpData;
}
Matrix MelodicData::expand_mix()
{
Matrix out;
out = expand_dimred(mixMatrix);
return out;
}
Matrix MelodicData::expand_dimred(const Matrix& Mat)
{
int first, last;
first = 1;
last = DWM.at(0).Ncols();
Matrix tmp = DWM.at(0) * Mat.Rows(first,last);
for(unsigned int ctr = 1; ctr < DWM.size(); ctr++){
first = last + 1;
last += DWM.at(ctr).Ncols();
tmp &= DWM.at(ctr) * Mat.Rows(first, last);
}
return tmp;
}
Matrix MelodicData::reduce_dimred(const Matrix& Mat)
{
int first, last;
first = 1;
last = WM.at(0).Ncols();
Matrix tmp = WM.at(0) * Mat.Rows(first,last);
for(unsigned int ctr = 1; ctr < WM.size(); ctr++){
first = last + 1;
last += WM.at(ctr).Ncols();
tmp &= WM.at(ctr) * Mat.Rows(first, last);
}
return tmp;
}
void MelodicData::set_TSmode()
{
dbgmsg(string("START: set_TSmode"));
Matrix tmp, tmpT, tmpS, tmpT2, tmpS2, tmpT3;
tmp = expand_dimred(mixMatrix);
tmpT = zeros(tmp.Nrows()/numfiles, tmp.Ncols());
tmpS = ones(numfiles, tmp.Ncols());
outMsize("tmp",tmp);
outMsize("tmpT",tmpT);
outMsize("tmpS",tmpS);
dbgmsg(string(" approach ") << opts.approach.value() << endl);
if(opts.approach.value()!=string("concat")){
message("Calculating T- and S-modes " << endl);
explained_var = krfact(tmp,tmpT,tmpS);
Tmodes.clear(); Smodes.clear();
for(int ctr = 1; ctr <= tmp.Ncols(); ctr++){
tmpT3 << reshape(tmp.Column(ctr),tmpT.Nrows(),numfiles);
outMsize("tmpT3", tmpT3);
tmpT2 << tmpT.Column(ctr);
tmpS2 << tmpS.Column(ctr);
tmpT3 << SP(tmpT3,pow(ones(tmpT3.Nrows(),1)*tmpS2.t(),-1));
if(numfiles>1)
tmpT2 |= tmpT3;
if(mean(tmpS2,1).AsScalar()<0){
tmpT2*=-1.0;
tmpS2*=-1.0;
}
add_Tmodes(tmpT2);
add_Smodes(tmpS2);
}
}
else{
Tmodes.clear();
Smodes.clear();
for(int ctr = 1; ctr <= tmp.Ncols(); ctr++){
tmpT3 << tmp.Column(ctr);
add_Tmodes(tmpT3);
}
}
if(opts.approach.value()!=string("concat")){
//add GLM OLS fit
dbgmsg(string(" GLM fitting ") << endl);
if(Tdes.Storage()){
Matrix alltcs = Tmodes.at(0).Column(1);
for(int ctr=1; ctr < (int)Tmodes.size();ctr++)
alltcs|=Tmodes.at(ctr).Column(1);
if((alltcs.Nrows()==Tdes.Nrows())&&(Tdes.Nrows()>Tdes.Ncols()))
glmT.olsfit(alltcs,Tdes,Tcon);
}
if(Sdes.Storage()){
Matrix alltcs = Smodes.at(0);
for(int ctr=1; ctr < (int)Smodes.size();ctr++)
alltcs|=Smodes.at(ctr);
if((alltcs.Nrows()==Sdes.Nrows())&&(Sdes.Nrows()>Sdes.Ncols()&&alltcs.Nrows()>2))
glmS.olsfit(alltcs,Sdes,Scon);
}
}
// else{
// dbgmsg(string(" Bypassing krfac ") << endl);
// add_Tmodes(tmp);
// add_Smodes(tmpS);
// }
dbgmsg(string("END: set_TSmode"));
}
void MelodicData::setup()
{
numfiles = (int)opts.inputfname.value().size();
setup_misc();
if(opts.filtermode){ // basic setup for filtering only
Data = process_file(opts.inputfname.value().at(0));
}
else{
if((numfiles > 1) && (opts.approach.value()==string("defl") || opts.approach.value()==string("symm")))
opts.approach.set_T("tica");
Matrix alldat, tmpData;
bool tmpvarnorm = opts.varnorm.value();
if(numfiles > 1 && opts.joined_vn.value()){
opts.varnorm.set_T(false);
}
alldat = process_file(opts.inputfname.value().at(0), numfiles) / numfiles;
if(opts.pca_dim.value() > alldat.Nrows()-2){
cerr << "ERROR:: too many components selected \n\n";
exit(2);
}
if(opts.debug.value())
save4D(alldat,string("preproc_dat") + num2str(1));
for(int ctr = 1; ctr < numfiles; ctr++){
tmpData = process_file(opts.inputfname.value().at(ctr), numfiles) / numfiles;
if(opts.debug.value())
save4D(tmpData,string("preproc_dat") + num2str(ctr+1));
if(tmpData.Ncols() == alldat.Ncols() && tmpData.Nrows() == alldat.Nrows())
alldat += tmpData;
else{
if(opts.approach.value()==string("tica")){
cerr << "ERROR:: data dimensions do not match, TICA not possible \n\n";
exit(2);
}
if(tmpData.Ncols() == alldat.Ncols()){
int mindim = min(alldat.Nrows(),tmpData.Nrows());
alldat = alldat.Rows(1,mindim);
tmpData = tmpData.Rows(1,mindim);
alldat += tmpData;
}
else
message("Data dimensions do not match - ignoring "+opts.inputfname.value().at(ctr) << endl);
}
}
//update mask
if(opts.update_mask.value()){
message("Excluding voxels with constant value ...");
update_mask(Mask, alldat);
message(" done" << endl);
}
if((numfiles > 1 ) && opts.joined_vn.value() && tmpvarnorm){
//variance - normalisation
message(endl<<"Normalising jointly by voxel-wise variance ...");
stdDev = varnorm(alldat,alldat.Nrows(),3.1);
stdDevi = pow(stdDev,-1);
message(" done" << endl);
}
if(numfiles>1)
message(endl << "Initial data size : "<<alldat.Nrows()<<" x "<<alldat.Ncols()<<endl<<endl);
if(opts.debug.value())
save4D(alldat,"alldat");
//estimate model order
Matrix tmpPPCA;
RowVector AdjEV, PercEV;
Matrix Corr, tmpE;
int order;
// cerr << "here1" << endl;
order = ppca_dim(remmean(alldat,2), RXweight, tmpPPCA, AdjEV, PercEV, Corr, pcaE, pcaD, Resels, opts.pca_est.value());
if (opts.paradigmfname.value().length()>0)
order += param.Ncols();
// cerr << "here2" << endl;
if(opts.pca_dim.value() == 0){
opts.pca_dim.set_T(order);
PPCA=tmpPPCA;
}
if(opts.pca_dim.value() < 0){
opts.pca_dim.set_T(min(order,-1*opts.pca_dim.value()));
PPCA=tmpPPCA;
}
order = opts.pca_dim.value();
if(opts.debug.value())
message(endl << "Model order : "<<order<<endl<<endl);
if (opts.paradigmfname.value().length()>0){
Matrix tmpPscales;
tmpPscales = param.t() * alldat;
paramS = stdev(tmpPscales.t());
calc_white(pcaE, pcaD, order, param, paramS, whiteMatrix, dewhiteMatrix);
}else
calc_white(pcaE, pcaD, order, whiteMatrix, dewhiteMatrix);
if(opts.debug.value()){
outMsize("pcaE",pcaE); saveascii(pcaE,"pcaE");
outMsize("pcaD",pcaD); saveascii(pcaD,"pcaD");
outMsize("AdjEV",AdjEV); saveascii(AdjEV,"AdjEV");
outMsize("PercEV",PercEV); saveascii(PercEV,"PercEV");
outMsize("tmpPPCA",tmpPPCA); saveascii(tmpPPCA,"tmpPPCA");
outMsize("whiteMatrix",whiteMatrix); saveascii(whiteMatrix,"whiteMatrix");
outMsize("dewhiteMatrix",dewhiteMatrix); saveascii(dewhiteMatrix,"dewhiteMatrix");
cerr << "Order: " << order << endl;
}
EV = AdjEV;
EVP = PercEV;
if(numfiles == 1){
Data = alldat;
Matrix tmp = IdentityMatrix(Data.Nrows());
DWM.push_back(tmp);
WM.push_back(tmp);
}
else {
//cerr << "here" << endl;
for(int ctr = 0; ctr < numfiles; ctr++){
tmpData = process_file(opts.inputfname.value().at(ctr), numfiles);
if(opts.joined_vn.value() && tmpvarnorm){
tmpData=SP(tmpData,pow(ones(tmpData.Nrows(),1)*stdDev,-1));
}
// whiten (separate / joint)
Matrix newWM,newDWM;
if(!opts.joined_whiten.value()){
message(" Individual whitening in a " << order << " dimensional subspace " << endl);
std_pca(tmpData, RXweight, Corr, pcaE, pcaD);
calc_white(pcaE, pcaD, order, newWM, newDWM);
}else{
if(!opts.dr_pca.value()){
std_pca(whiteMatrix*tmpData, RXweight, Corr, pcaE, pcaD);
calc_white(pcaE, pcaD, order, newWM, newDWM);
newDWM=(dewhiteMatrix*newDWM);
newWM=(newWM*whiteMatrix);
}
else{
if(opts.debug.value())
message(" --mod_pca ");
Matrix tmp1, tmp2;
tmp1 = whiteMatrix * alldat;
tmp1 = remmean(tmp1,2) * tmpData.t();
tmp2 = pinv(tmp1.t()).t();
std_pca(tmp1 * tmpData, RXweight, Corr, pcaE, pcaD);
calc_white(pcaE, pcaD, order, newWM, newDWM);
newDWM=(tmp2*newDWM);
newWM=(newWM * tmp1);
}
}
DWM.push_back(newDWM);
WM.push_back(newWM);
tmpData = newWM * tmpData;
//concatenate Data
if(Data.Storage() == 0)
Data = tmpData;
else
Data &= tmpData;
}
}
opts.varnorm.set_T(tmpvarnorm);
message(endl << " Data size : "<<Data.Nrows()<<" x "<<Data.Ncols()<<endl<<endl);
outMsize("stdDev",stdDev);
//meanC=mean(Data,2);
if(opts.debug.value())
save4D(Data,"concat_data");
//save the mean & mask
save_volume(Mask,logger.appendDir("mask"));
save_volume(Mean,logger.appendDir("mean"));
}
} // void setup()
void MelodicData::setup_misc()
{
//initialize Mean
read_volume(Mean,opts.inputfname.value().at(0));
//create mask
create_mask(Mask);
//setup background image
if(opts.bgimage.value()>""){
read_volume(background,opts.bgimage.value());
if(!samesize(Mean,background)){
cerr << "ERROR:: background image and data have different dimensions \n\n";
exit(2);
}
}else{
background = Mean;
}
if(!samesize(Mean,Mask)){
cerr << "ERROR:: mask and data have different dimensions \n\n";
exit(2);
}
//reset mean
Mean *= 0;
//set up weighting
if(opts.segment.value().length()>0){
create_RXweight();
}
//seed the random number generator
double tmptime = time(NULL);
if ( opts.seed.value() != -1 ) {
tmptime = opts.seed.value();
}
srand((unsigned int) tmptime);
if(opts.paradigmfname.value().length()>0){
message(" Use columns in " << opts.paradigmfname.value()
<< " for PCA initialisation" <<endl);
param = read_ascii_matrix(opts.paradigmfname.value());
Matrix tmpPU, tmpPV;
DiagonalMatrix tmpPD;
SVD(param, tmpPD, tmpPU, tmpPV);
param = tmpPU;
opts.pca_dim.set_T(std::max(opts.pca_dim.value(), param.Ncols()+3));
if(opts.debug.value()){
outMsize("Paradigm",param); saveascii(param,"param");
}
//opts.guessfname.set_T(opts.paradigmfname.value());
}
//read in post-proc design matrices etc
if(opts.fn_Tdesign.value().length()>0)
Tdes = read_ascii_matrix(opts.fn_Tdesign.value());
if(opts.fn_Sdesign.value().length()>0)
Sdes = read_ascii_matrix(opts.fn_Sdesign.value());
if(opts.fn_Tcon.value().length()>0)
Tcon = read_ascii_matrix(opts.fn_Tcon.value());
if(opts.fn_Scon.value().length()>0)
Scon = read_ascii_matrix(opts.fn_Scon.value());
if(opts.fn_TconF.value().length()>0)
TconF = read_ascii_matrix(opts.fn_TconF.value());
if(opts.fn_SconF.value().length()>0)
SconF = read_ascii_matrix(opts.fn_SconF.value());
if(numfiles>1 && Sdes.Storage() == 0){
Sdes = ones(numfiles,1);
if(Scon.Storage() == 0){
Scon = ones(1,1);
Scon &= -1*Scon;
}
}
Tdes = remmean(Tdes,1);
}
void MelodicData::save()
{
//check for temporal ICA
if(opts.temporal.value()){
message(string("temporal ICA: transform back the data ... "));
Matrix tmpIC = mixMatrix.t();
mixMatrix=IC.t();
IC=tmpIC;
unmixMatrix=pinv(mixMatrix);
Data = Data.t();
tmpIC = meanC;
meanC = meanR.t();
meanR = tmpIC.t();
// whiteMatrix = whiteMatrix.t;
// dewhiteMatrix = dewhiteMatrix.t();
message(string("done") << endl);
opts.temporal.set_T(false); // Do not switch again!
}
message(endl << "Writing results to : " << endl);
//Output IC
if((IC.Storage()>0)&&(opts.output_origIC.value())&&(after_mm==false))
save4D(IC,opts.outputfname.value() + "_oIC");
//Output IC -- adjusted for noise
if(IC.Storage()>0){
volume4D<float> tempVol;
//Matrix ICadjust;
if(after_mm){
save4D(IC,opts.outputfname.value() + "_IC");
// ICadjust = IC;
}
else{
Matrix resids = stdev(Data - mixMatrix * IC);
for(int ctr=1;ctr<=resids.Ncols();ctr++)
if(resids(1,ctr) < 0.05)
resids(1,ctr)=1;
// stdNoisei = pow(stdev(Data - mixMatrix * IC)*
// std::sqrt((float)(Data.Nrows()-1))/
// std::sqrt((float)(Data.Nrows()-IC.Nrows())),-1);
stdNoisei = pow(resids*
std::sqrt((float)(Data.Nrows()-1))/
std::sqrt((float)(Data.Nrows()-IC.Nrows())),-1);
ColumnVector diagvals;
diagvals=pow(diag(unmixMatrix*unmixMatrix.t()),-0.5);
save4D(SP(IC,diagvals*stdNoisei),opts.outputfname.value() + "_IC");
}
if(opts.output_origIC.value())
save4D(stdNoisei,string("Noise_stddev_inv"));
}
//Output T- & S-modes
save_Tmodes();
save_Smodes();
//Output mixMatrix
if(mixMatrix.Storage()>0){
saveascii(expand_mix(), opts.outputfname.value() + "_mix");
mixFFT=calc_FFT(expand_mix(), opts.logPower.value());
saveascii(mixFFT,opts.outputfname.value() + "_FTmix");
}
//Output PPCA
if(PPCA.Storage()>0)
saveascii(PPCA, opts.outputfname.value() + "_PPCA");
//Output ICstats
if(ICstats.Storage()>0)
saveascii(ICstats,opts.outputfname.value() + "_ICstats");
//Output unmixMatrix
if(opts.output_unmix.value() && unmixMatrix.Storage()>0)
saveascii(unmixMatrix,opts.outputfname.value() + "_unmix");
//Output Mask
message(" "<< logger.appendDir("mask") <<endl);
//Output mean
if(opts.output_mean.value() && meanC.Storage()>0 && meanR.Storage()>0){
saveascii(meanR,opts.outputfname.value() + "_meanR");
saveascii(meanC,opts.outputfname.value() + "_meanC");
}
//Output white
if(opts.output_white.value() && whiteMatrix.Storage()>0&&
dewhiteMatrix.Storage()>0){
saveascii(whiteMatrix,opts.outputfname.value() + "_white");
saveascii(dewhiteMatrix,opts.outputfname.value() + "_dewhite");
Matrix tmp;
tmp=calc_FFT(dewhiteMatrix, opts.logPower.value());
saveascii(tmp,opts.outputfname.value() + "_FTdewhite");
}
//Output PCA
if(opts.output_pca.value() && pcaD.Storage()>0&&pcaE.Storage()>0){
saveascii(pcaE,opts.outputfname.value() + "_pcaE");
saveascii((Matrix) diag(pcaD),opts.outputfname.value() + "_pcaD");
Matrix PCAmaps;
if(whiteMatrix.Ncols()==Data.Ncols())
PCAmaps = dewhiteMatrix.t();
else
PCAmaps = whiteMatrix * Data;
save4D(PCAmaps,opts.outputfname.value() + "_pca");
}
message("...done" << endl);
} //void save()
int MelodicData::remove_components()
{
message("Reading " << opts.filtermix.value() << endl)
mixMatrix = read_ascii_matrix(opts.filtermix.value());
if (mixMatrix.Storage()<=0) {
cerr <<" Please specify the mixing matrix correctly" << endl;
exit(2);
}
unmixMatrix = pinv(mixMatrix);
IC = unmixMatrix * Data;
string tmpstr;
tmpstr = opts.filter.value();
Matrix noiseMix;
Matrix noiseIC;
int ctr=0;
char *p;
char t[1024];
const char *discard = ", [];{(})abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ~!@#$%^&*_-=+|\':><./?";
message("Filtering the data...");
strcpy(t, tmpstr.c_str());
p=strtok(t,discard);
ctr = atoi(p);
if(ctr>0 && ctr<=mixMatrix.Ncols()){
message(" "<< ctr );
noiseMix = mixMatrix.Column(ctr);
noiseIC = IC.Row(ctr).t();
}
else{
cerr << endl<< "component number "<<ctr<<" does not exist" << endl;
}
do{
p=strtok(NULL,discard);
if(p){
ctr = atoi(p);
if(ctr>0 && ctr<=mixMatrix.Ncols()){
message(" "<<ctr);
noiseMix |= mixMatrix.Column(ctr);
noiseIC |= IC.Row(ctr).t();
}
else{
cerr << endl<< "component number "<<ctr<<" does not exist" << endl;
}
}
}while(p);
message(endl);
Matrix newData;
outMsize("DATA",Data);
outMsize("IC",IC);
outMsize("noiseIC",noiseIC);
outMsize("noiseMix",noiseMix);
outMsize("meanR",meanR);
outMsize("meanC",meanC);
newData = Data - noiseMix * noiseIC.t();
if(meanR.Storage()>0)
newData = newData + ones(newData.Nrows(),1)*meanR;
volume4D<float> tmp;
read_volume4D(tmp,opts.inputfname.value().at(0));
tmp.setmatrix(newData,Mask);
save_volume4D(tmp,logger.appendDir(opts.outputfname.value() + "_ICAfiltered"));
return 0;
} // int remove_components()
void MelodicData::create_RXweight()
{
message("Reading the weights for the covariance R_X from file "<< opts.segment.value() << endl);
volume4D<float> tmpRX;
read_volume4D(tmpRX,opts.segment.value());
RXweight = tmpRX.matrix(Mask);
}
void MelodicData::est_smoothness()
{
if(Resels == 0){
string SM_path = opts.binpath + "smoothest";
string Mask_fname = logger.appendDir("mask");
if(opts.segment.value().length()>0){
Mask_fname = opts.segment.value();
}
// Setup external call to smoothest:
char callSMOOTHESTstr[1000];
ostrstream osc(callSMOOTHESTstr,1000);
osc << SM_path << " -d " << data_dim()
<< " -r " << opts.inputfname.value().at(0) << " -m "
<< Mask_fname << " > " << logger.appendDir("smoothest") << '\0';
message(" Calling Smoothest: " << callSMOOTHESTstr << endl);
system(callSMOOTHESTstr);
//read back the results
ifstream in;
string str;
Resels = 1.0;
in.open(logger.appendDir("smoothest").c_str(), ios::in);
if(in>0){
for(int ctr=1; ctr<7; ctr++)
in >> str;
in.close();
if(str!="nan")
Resels = atof(str.c_str());
}
}
}
unsigned long MelodicData::standardise(volume<float>& mask, volume4D<float>& R)
{
unsigned long count = 0;
int M=R.tsize();
for (int z=mask.minz(); z<=mask.maxz(); z++) {
for (int y=mask.miny(); y<=mask.maxy(); y++) {
for (int x=mask.minx(); x<=mask.maxx(); x++) {
if( mask(x,y,z) > 0.5) {
count ++;
if( M > 2 ) {
// For each voxel
// calculate mean and standard deviation...
double Sx = 0.0, SSx = 0.0;
for ( int t = 0; t < M; t++ ) {
float R_it = R(x,y,z,t);
Sx += R_it;
SSx += (R_it)*(R_it);
}
float mean = Sx / M;
float sdsq = (SSx - ((Sx)*(Sx) / M)) / (M - 1) ;
if (sdsq<=0) {
// trap for differences between mask and invalid data
mask(x,y,z)=0;
count--;
} else {
// ... and use them to standardise to N(0, 1).
for ( unsigned short t = 0; t < M; t++ ) {
R(x,y,z,t) = (R(x,y,z,t) - mean) / sqrt(sdsq);
}
}
}
}
}
}
}
return count;
}
float MelodicData::est_resels(volume4D<float> R, volume<float> mask)
{
message(" Estimating data smoothness ... ");
unsigned long mask_volume = standardise(mask, R);
int dof = R.tsize();
unsigned long N = mask_volume;
// MJ additions to make it cope with 2D images
bool usez = true;
if (R.zsize() <= 1) { usez = false; }
enum {X = 0, Y, Z};
float SSminus[3] = {0, 0, 0}, S2[3] = {0, 0, 0};
int zstart=1;
if (!usez) zstart=0;
for ( unsigned short z = zstart; z < R.zsize() ; z++ )
for ( unsigned short y = 1; y < R.ysize() ; y++ )
for ( unsigned short x = 1; x < R.xsize() ; x++ )
// Sum over N
if( (mask(x, y, z)>0.5) &&
(mask(x-1, y, z)>0.5) &&
(mask(x, y-1, z)>0.5) &&
( (!usez) || (mask(x, y, z-1)>0.5) ) ) {
N++;
for ( unsigned short t = 0; t < R.tsize(); t++ ) {
// Sum over M
SSminus[X] += R(x, y, z, t) * R(x-1, y, z, t);
SSminus[Y] += R(x, y, z, t) * R(x, y-1, z, t);
if (usez) SSminus[Z] += R(x, y, z, t) * R(x, y, z-1, t);
S2[X] += 0.5 * (R(x, y, z, t)*R(x, y, z, t) +
R(x-1, y, z, t)*R(x-1, y, z, t));
S2[Y] += 0.5 * (R(x, y, z, t)*R(x, y, z, t) +
R(x, y-1, z, t)*R(x, y-1, z, t));
if (usez) S2[Z] += 0.5 * (R(x, y, z, t)*R(x, y, z, t) +
R(x, y, z-1, t)*R(x, y, z-1, t));
}
}
float norm = 1.0/(float) N;
float v = dof; // v - degrees of freedom (nu)
if(R.tsize() > 1) {
norm = (v - 2) / ((v - 1) * N * R.tsize());
}
// for extreme smoothness
if (SSminus[X]>=0.99999999*S2[X])
SSminus[X]=0.99999*S2[X];
if (SSminus[Y]>=0.99999999*S2[Y])
SSminus[Y]=0.99999*S2[Y];
if (usez)
if (SSminus[Z]>=0.99999999*S2[Z])
SSminus[Z]=0.99999*S2[Z];
// Convert to sigma squared
float sigmasq[3] = {0,0,0};
sigmasq[X] = -1.0 / (4 * log(fabs(SSminus[X]/S2[X])));
sigmasq[Y] = -1.0 / (4 * log(fabs(SSminus[Y]/S2[Y])));
if (usez) { sigmasq[Z] = -1.0 / (4 * log(fabs(SSminus[Z]/S2[Z]))); }
// Convert to full width half maximum
float FWHM[3] = {0,0,0};
FWHM[X] = sqrt(8 * log(2) * sigmasq[X]);
FWHM[Y] = sqrt(8 * log(2) * sigmasq[Y]);
if (usez) { FWHM[Z] = sqrt(8 * log(2) * sigmasq[Z]); }
float resels = FWHM[X] * FWHM[Y];
if (usez) resels *= FWHM[Z];
message(" done " <<endl);
return resels;
}
void MelodicData::create_mask(volume<float>& theMask)
{
if(opts.use_mask.value() && opts.maskfname.value().size()>0){ // mask provided
read_volume(theMask,opts.maskfname.value());
message("Mask provided : " << opts.maskfname.value()<<endl<<endl);
}
else{
if(opts.perf_bet.value() && opts.use_mask.value()){ //use BET
message("Create mask ... ");
//save first image
tmpnam(Mean_fname); // generate a tmp name
save_volume(Mean,Mean_fname);
// set up all strings
string BET_outputfname = string(Mean_fname)+"_brain";
string BET_path = opts.binpath + "bet";
string BET_optarg = "-m -f 0.4"; // see man bet
string Mask_fname = BET_outputfname+"_mask";
// Setup external call to BET:
// char callBETstr[1000];
// ostrstream betosc(callBETstr,1000);
// betosc << BET_path << " " << Mean_fname << " "
// << BET_outputfname << " " << BET_optarg << " > /dev/null " << '\0';
// message(" Calling BET: " << callBETstr << endl);
// system(callBETstr);
string tmpstr = BET_path + string(" ") +
Mean_fname + string(" ") + BET_outputfname + string(" ") +
BET_optarg + string(" > /dev/null ");
system(tmpstr.c_str());
// read back the Mask file
read_volume(theMask,Mask_fname);
// clean /tmp
char callRMstr[1000];
ostrstream osc(callRMstr,1000);
osc << "rm " << string(Mean_fname) <<"* " << '\0';
system(callRMstr);
message("done" << endl);
}
else{
if(opts.use_mask.value()){ //just threshold the Mean
message("Create mask ... ");
float Mmin, Mmax, Mtmp;
Mmin = Mean.min(); Mmax = Mean.max();
theMask = binarise(Mean,Mmin + opts.threshold.value()*
(Mmax-Mmin),Mmax);
Mtmp = Mmin + opts.threshold.value()* (Mmax-Mmin);
message("done" << endl);
}
else{ //well, don't threshold then
theMask = Mean;
theMask = 1.0;
}
}
}
if(opts.remove_endslices.value()){
// just in case mc introduced something nasty
message(" Deleting end slices" << endl);
for(int ctr1=theMask.miny(); ctr1<=theMask.maxy(); ctr1++){
for(int ctr2=theMask.minx(); ctr2<=theMask.maxx(); ctr2++){
theMask(ctr2,ctr1,Mask.minz()) = 0.0;
theMask(ctr2,ctr1,Mask.maxz()) = 0.0;
}
}
}
} //void create_mask()
void MelodicData::sort()
{
int numComp = mixMatrix.Ncols(), numVox = IC.Ncols(),
numTime = mixMatrix.Nrows(), i,j;
//flip IC maps to be positive (on max)
//flip Subject/Session modes to be positive (on average)
//flip time courses accordingly
for(int ctr_i = 1; ctr_i <= numComp; ctr_i++)
if(IC.Row(ctr_i).MaximumAbsoluteValue()>IC.Row(ctr_i).Maximum()){
flipres(ctr_i);
}
message("Sorting IC maps" << endl);
Matrix tmpscales, tmpICrow, tmpMIXcol;
if(numfiles > 1 && opts.approach.value()==string("tica")){
set_TSmode();
Matrix allmodes = Smodes.at(0);
for(int ctr = 1; ctr < (int)Smodes.size();++ctr)
allmodes |= Smodes.at(ctr);
tmpscales = median(allmodes).t();
} else {
// re-order wrt standard deviation of IC maps
tmpscales = stdev(IC,2);
}
ICstats = tmpscales;
double max_val, min_val = tmpscales.Minimum()-1;
for(int ctr_i = 1; ctr_i <= numComp; ctr_i++){
max_val = tmpscales.Maximum2(i,j);
ICstats(ctr_i,1)=max_val;
tmpICrow = IC.Row(ctr_i);
tmpMIXcol = mixMatrix.Column(ctr_i);
IC.SubMatrix(ctr_i,ctr_i,1,numVox) = IC.SubMatrix(i,i,1,numVox);
mixMatrix.SubMatrix(1,numTime,ctr_i,ctr_i) =
mixMatrix.SubMatrix(1,numTime,i,i);
IC.SubMatrix(i,i,1,numVox) = tmpICrow.SubMatrix(1,1,1,numVox);
mixMatrix.SubMatrix(1,numTime,i,i) = tmpMIXcol.SubMatrix(1,numTime,1,1);
tmpscales(i,1)=tmpscales(ctr_i,1);
tmpscales(ctr_i,1)=min_val;
}
ICstats /= ICstats.Column(1).Sum();
ICstats *= 100;
if(EVP.Storage()>0){
tmpscales = ICstats.Column(1).AsMatrix(ICstats.Nrows(),1) * EVP(1,numComp);
ICstats |= tmpscales;
}
if(Data.Storage()>0&&stdDev.Storage()>0){
Matrix copeP(tmpscales), copeN(tmpscales);
Matrix max_ICs(tmpscales), min_ICs(tmpscales);
for(int ctr_i = 1; ctr_i <= numComp; ctr_i++){
int i,j;
max_ICs(ctr_i,1) = IC.Row(ctr_i).Maximum2(i,j);
copeP(ctr_i,1) = std::abs((pinv(mixMatrix)*
Data.Column(j)).Row(ctr_i).AsScalar()*stdDev(1,j)*100*
(mixMatrix.Column(ctr_i).Maximum()-
mixMatrix.Column(ctr_i).Minimum())/meanR(1,j));
min_ICs(ctr_i,1) = IC.Row(ctr_i).Minimum2(i,j);
copeN(ctr_i,1) = -1.0*std::abs((pinv(mixMatrix)*
Data.Column(j)).Row(ctr_i).AsScalar()*stdDev(1,j)*100*
(mixMatrix.Column(ctr_i).Maximum()-
mixMatrix.Column(ctr_i).Minimum())/meanR(1,j));
}
ICstats |= copeP;
ICstats |= copeN;
}
mixFFT=calc_FFT(expand_mix(), opts.logPower.value());
unmixMatrix = pinv(mixMatrix);
}
void MelodicData::reregress()
{
if((numfiles > 1)){
}
}
void MelodicData::status(const string &txt)
{
cout << "MelodicData Object " << txt << endl;
if(Data.Storage()>0){cout << "Data: " << Data.Nrows() <<"x" << Data.Ncols() << endl;}else{cout << "Data empty " <<endl;}
if(pcaE.Storage()>0){cout << "pcaE: " << pcaE.Nrows() <<"x" << pcaE.Ncols() << endl;}else{cout << "pcaE empty " <<endl;}
if(pcaD.Storage()>0){cout << "pcaD: " << pcaD.Nrows() <<"x" << pcaD.Ncols() << endl;}else{cout << "pcaD empty " <<endl;}
if(whiteMatrix.Storage()>0){cout << "white: " << whiteMatrix.Nrows() <<"x" << whiteMatrix.Ncols() << endl;}else{cout << "white empty " <<endl;}
if(dewhiteMatrix.Storage()>0){cout << "dewhite: " << dewhiteMatrix.Nrows() <<"x" << dewhiteMatrix.Ncols() << endl;}else{cout << "dewhite empty " <<endl;}
if(mixMatrix.Storage()>0){cout << "mix: " << mixMatrix.Nrows() <<"x" << mixMatrix.Ncols() << endl;}else{cout << "mix empty " <<endl;}
if(unmixMatrix.Storage()>0){cout << "unmix: " << unmixMatrix.Nrows() <<"x" << unmixMatrix.Ncols() << endl;}else{cout << "unmix empty " <<endl;}
if(IC.Storage()>0){cout << "IC: " << IC.Nrows() <<"x" << IC.Ncols() << endl;}else{cout << "IC empty " <<endl;}
} //void status()
}