vtcreplaceheaderparameter.m

VTC file is the file format of the Brainvoyager. The FMRI matchine scan human s brain and get the vt

function returnVal = vtcReplaceHeaderParameter(path, vtc, newVal);

% syntax : vtcReplaceHeaderParameter(path, vtc, newVal)
% the function replace a header parameter with newVal
% it is now written for the NoOfVolumes parameter, but this can easily be changed.
% 
% This function was written by:
% Hagar Gelbard
% Rafi Malach's Lab
% Weizmann Institute of Science
% Rehovot, Israel
% [e-mail]

% open the file for reading and writing
fid = fopen([path vtc '.vtc'],'r+');

% READ HEADER

% read version number
ver = fread(fid,1,'short');
	
% read fmr name
fmr = [];
a = 'a';
while a ~= 0
  a = fread(fid,1,'char');
  fmr = [fmr a];
end

% read protocol name
protocol = [];
a = 'a';
while a ~= 0
  a = fread(fid,1,'char');
  protocol = [protocol a];
end

% read important parameters
% -----------------------------------------------------------------------
% use the following code to replace a variable
% -----------------------------------------------------------------------
tmp=ftell(fid);
NoOfVolumes = fread(fid,1,'short');
fseek(fid,tmp,'bof');
fwrite(fid, newVal, 'short');

VTC_resolution  = fread(fid,1,'short');
XStart = fread(fid,1,'short');
XEnd = fread(fid,1,'short');
YStart = fread(fid,1,'short');
YEnd = fread(fid,1,'short');
ZStart = fread(fid,1,'short');
ZEnd = fread(fid,1,'short');
HemDelay = fread(fid,1,'short');
TR = fread(fid,1,'float');
HemDelta = fread(fid,1,'float');
HemTau = fread(fid,1,'float');
SegmentSize = fread(fid,1,'short');
SegmentOffset = fread(fid,1,'short');

fclose('all');