Empty output of image for PECT reconstruction

1

Dear all,

I am using the CASToR for reconstruction of SPECT. I have got the result ,but it is dark.The value is too low. After checking the output from Gate ,I did not find  any issue.Could you give me some suggestion?

QQ_1724738899634
QQ_17247388996341893×759 101 KB

Here are the command I used：

（1）castor-GATERootToCastor -i output/test1.root -o recon/test1 -m head1.mac -geo -s test1 -sp_bins 220,220
（2）castor-recon -df recon/test1_df.Cdh -opti MLEM -it 2:15 -proj joseph -conv gaussian,5.,5.,5::psf -dim 128,128,132 -vox 2.34,2.34,2.15 -dout recon/output/test1

And here is all the file(https://we.tl/t-nFvwLRahZW) .

Best,
Gogi

2

Dear Gogi,
Please remove the option “dim” and “vox” and let it calculated automatically

3

Dear Hamid,

Thanks very much for your help. But, after I am following your advice, the value is still very low .

QQ_1724811959236
QQ_17248119592361644×1104 89.6 KB

I am thinking could there be something wrong with my gate program？Or have you already opened the file and run it successfully?

Best,
Gogi

4

Can you try opening it with something else than Amide? Some versions of Amide have a problem with Endianness which would result in image similar to the last shown.

See [Reading Interfile with ImageJ] where this problem was also discussed.

Bests,
Maxime

6

Dear Gogi,
I had this problem too. I think you have a problem with phantom.
Before scanning with GATE simulation, Phantom should be checked with the Matlab app and adjust the range of your phantom.

7

Have you ever solve the problem ? Or do you have some examples those can run successfully?

You mean: Check whether the position of the phantom coincides with the position of the source? By using QT, there is not problem about that .And when I used ROOT to check the sourcePox、sourcePosY、sourcePosZ and draw their three-dimensional distribution,I found it also had no problem.

Best,
Gogi