[gate-users] PETbench works fine but SPECTbench spectra goes wrong

[ywyang]

Dear All :

    I am struggling with benchmarks. I followed the instructions of
manuals and got help from this group. I used the mac files downloaded.

    It seems everything is OK when the results of PET bench are comparable
with manuals. But benchSPECT did not work well. The scatters in medium
and scatter order was different from the results showed in the manuals.
Is it allright or I have some troubles in installation ?

Followed are the messages.

[gate at localhost benchmarkSPECT]$ ./benchmark_spectra gateSingles.dat
Enter the lower energy threshold (MeV)

0.02


Lower energy threshold is 0.020000 MeV


Enter the upper energy threshold (MeV)

0.19

 Upper energy threshold is 0.190000 MeV

 Enter the number of energy windows

100

 Energy range will be divided into 100 energy windows

 Enter the number of scattering volume (max is 10)

6

 6 scattering volumes will be considered

 Enter the first four letters of the scattering volume number 1

shie

Enter the first four letters of the scattering volume number 2

coll

Enter the first four letters of the scattering volume number 3

comp

Enter the first four letters of the scattering volume number 4

tabl

Enter the first four letters of the scattering volume number 5

movs

Enter the first four letters of the scattering volume number 6

Phan



The scattering volumes that will be considered are the following:

shie

coll

comp

tabl

movs

Phan



Beginning of processing

 End of processing



File fich_p correponds to the Unscattered spectrum

File fich_c correponds to the photons which have scattered in the crystal

File fich_t correponds to the total ernergy spectrum

File fich_1 correspond to the photon whose last scatter interaction was  in 
the shie volume

File fich_2 correspond to the photon whose last scatter interaction was  in 
the coll volume

File fich_3 correspond to the photon whose last scatter interaction was  in 
the comp volume

File fich_4 correspond to the photon whose last scatter interaction was  in 
the tabl volume

File fich_5 correspond to the photon whose last scatter interaction was  in 
the movs volume

File fich_6 correspond to the photon whose last scatter interaction was  in 
the Phan volume

File name fich_o1 corresponds to the first order scatter

File name fich_o2 corresponds to the second order scatter

File name fich_o3 corresponds to the third order scatter

File name fich_o4 corresponds to the fourth order scatter

File name fich_o5 corresponds to the scatter order greater than 4

Number of counts for the total energy spectrum = 35795

Number of counts for the Unscattered spectrum =30077

Number of counts for the total scatter spectrum =5718

Number of counts for the crystal scatter spectrum =3786

Number of counts for the shie scatter spectrum = 1

Number of counts for the coll scatter spectrum = 705

Number of counts for the comp scatter spectrum = 46

Number of counts for the tabl scatter spectrum = 132

Number of counts for the movs scatter spectrum = 275

Number of counts for the Phan scatter spectrum = 773

Number of counts for the order1 scatter spectrum = 11195

Number of counts for the order2 scatter spectrum = 5940

Number of counts for the order3 scatter spectrum = 3013

Number of counts for the order4 scatter spectrum = 1460

Number of counts for scatter orders greater than 4 spectrum = 1311



##########################################################################



Number of detected counts from 0.020 to 0.190 MeV : 35795

Unscattered events (percentage of total counts)= 84.03

Scatter in the crystal (percentage of total counts) = 10.58

Scatter in the shie volume (percentage of total scatter) = 0.00

Scatter in the coll volume (percentage of total scatter) = 1.97

Scatter in the comp volume (percentage of total scatter) = 0.13

Scatter in the tabl volume (percentage of total scatter) = 0.37

Scatter in the movs volume (percentage of total scatter) = 0.77

Scatter in the Phan volume (percentage of total scatter) = 2.16

Scatter order1 (percentage of total scatter) = 195.79

Scatter order2 (percentage of total scatter) = 103.88

Scatter order3 (percentage of total scatter) = 52.69

Scatter order4 (percentage of total scatter) = 25.53

Scatter orders greater than 4 (percentage of total scatter) = 22.93







Thanks for your kind help.



best regards,

Yu-Wen Yang