[Gate-users] Voxellized phantom problem?

[Susana Branco Silva]

Hello wei!


I’m using the MOBY phantom too!

 

You have to be care with one thing: GATE can’t read float data (32 bit)! So you'll need to convert your phantom file to unsigned interger (16 bit) format (with IDL or MATLAB for instance).

 

Just do the data conversion and follow the hoffman brain example inside the GATE distribution!!

Careful: check you image conversion before launch your simulation… If all scripts are well defined and you got the message above, probably is because the conversion wasn't done correctly:

 

GateSourceVoxelImageReader::ReadFile : fileName: moby.h33

 Header read from           'moby.h33'

 Data file name                'moby.i33'

 Nb of planes:                  122

 Nb of pixels per plane:   40 40

 Pixel size:                       5.000e-01 5.000e-01

 Slice thickness:              5.000e-01

 Matrix size:            2.000e+01 2.000e+01

 Data type:              UNSIGNED INTEGER

 

 Ignoring confine condition

Source ---------------> voxel_mouse

  ID                         : 0

  type                      : backtoback

  startTime (s)         : 0.000e+00

  time (s)                  : 0.000e+00

  forcedUnstable      : 1

  forcedLifetime (s)  : 9.502e+03

  verboseLevel           : 0

-----------------------

  

Voxel reader ---------->   number of voxels       : 0

total activity (Bq)    : 0.000e+00

 

 

Hope this help you.

 

Cheers,

 

Susana Branco Silva

 

untitled

Faculdade de Ciências da Universidade de Lisboa

Campo Grande, 1749-016 Lisboa, Portugal
Phone: (+351) 21 750 01 77 ext.: 20515
Fax:  (+351) 21 750 00 30

 <mailto:susana.silva at fc.ul.pt> email: susana.silva at fc.ul.pt

url: www.ibeb.fc.ul.pt

 

 

-----Original Message-----
From: gate-users-bounces at lists.healthgrid.org [mailto:gate-users-bounces at lists.healthgrid.org] On Behalf Of wqy
Sent: segunda-feira, 19 de Maio de 2008 16:33
To: gate-users at lists.healthgrid.org
Subject: [Gate-users] Voxellized phantom problem?

 

Hello Gate User,

            

          I have used Gate to simulate  the Moby Phantom and encountered

an error.The following is the error which Gate output:

"...

...

'nrecognised type name 'short float

'nrecognised type name 'short float

 Header read from       'm007-heart_act_1.h33'

'Data file name         'm007-heart_act_1.i33

 Nb of planes:           0

 Nb of pixels per plane: 256 256

 Pixel size:             1 1

 Slice thickness:        0

 Matrix size:            256 256

 Data type:              

 

 

Error: one of the matrix dimensions is zero!

ERROR - G4Box()::G4Box(): hof_brain_S

        Dimensions too small ! - 0, 0, 0

 

*** G4Exception : InvalidSetup

      issued by : G4Box::G4Box()

Invalid dimensions. Too small.

*** Fatal Exception *** core dump ***

 "

        

By the way:      1.the interfile is correct, it can be read by xmedcon

exactly.

                          2. the Gate is installed correctly, it can be

simulated the example Voxellized phantom (hof3.h33,hof3.i33)

 

I have no idea how to dealwith  the problem. Could someone help me？

Best regards and thanks!

 

 

wei 

Dept. of Engineering Physics

Tsinghua University

 

 

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