[Gate-users] How to transfer the “.root” to “.dat” !?

[Marc Chamberland]

My attachment did not make it to the mailing list.

Here's the macro I was using (just save it as a .cpp file):


/* extractLOR.cpp
 *
 * ROOT MACRO
 * 
 * Extract the LOR from the ROOT output
 *
 */

{
	gROOT->Reset();
	
#include "Riostream.h"
	
	Int_t i, nevents;	//index i and number of event
	Double_t time;	//time of event
	Float_t x1, y1, z1, x2, y2, z2;	//endpoints of the LOR
	ofstream fout;	//output file
	fout.open("lor_resoSim1.txt");	//store the LOR in the file lor.txt
	
	TFile *f = new TFile("./resoSim1.root");	//replace "output.root" by your root file
	TTree *t = f->Get("Coincidences");	//this is where you tell it what "tree" you want to access: coincidences, singles, or I don't know what else
	
	//here, you get the address of all the info you want (but you don't get the actual values yet)
	t->SetBranchAddress("globalPosX1", &x1);
	t->SetBranchAddress("globalPosY1", &y1);
	t->SetBranchAddress("globalPosZ1", &z1);
	t->SetBranchAddress("globalPosX2", &x2);
	t->SetBranchAddress("globalPosY2", &y2);
	t->SetBranchAddress("globalPosZ2", &z2);
	t->SetBranchAddress("time1", &time);
	/*NOTE: the "name" of the info you want (e.g. "globalPosX1", or "time1") can be found in the root file;
	 1) Open the root file in root: root yourRootFile.root
	 2) Type: TBrowser t
	 3) Navigate to your root file and open it
	 4) Go into the Coincidences directory ("tree", in the root lingo)
	 5) All the "leaves" you see are the information stored for each coincidence; this is where the "globalPosX1" and "time1" come from
	 */
	
	nevents = t->GetEntries();	//I need the total number of events in order to loop adequately over all events
	
	//it's in this loop that you actually extract all the info that you just told root you wanted
	for (i = 0; i < nevents; i++) {
		t->GetEntry(i);	//here, you're accessing event #i; all your variables from above now get the values desired
		//write these values to a .txt file:
		fout << x1 << "\t" << y1 << "\t" << z1 << "\t";
		fout << x2 << "\t" << y2 << "\t" << z2 << "\t";
		fout << time*1000 << "\n";
	}
		
		fout.close();
}




Cheers!
Marc



__________________________


Marc Chamberland, MSc
PhD candidate
Department of Physics
Carleton University
Ottawa (ON)

Le 2012-02-08 à 4:10 AM, Spencer Lu a écrit :

> Dear,all
> 
> 
> Excuse me, How to transfer the *“.root”* to *“.dat”*  ??
> 
> 
> Since I found that when I used the “Parameterized fanbeam collimator” in
> Gate,
> 
> the ASCII output (.dat) won’t change while the "fanbeam collimator’s
> parameter" changes
> 
> Only the Root output works!!
> 
> But i have to get the root’s original data (like ASCII output) to reconstruct
> the image!
> 
> 
> 
> Thank you !
> 
> Best Regards
> 
> 
> 
> Spencer Lu
> 
> Medical Imgaing Processing Lab (MIPL)
> 
> Department of Biomedical Engineering and Environmental Sciences,
> 
> National Tsing-Hua University, Taiwan
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