Success - HCP-gradunwarp version 1.0.3 runs without errors.

Thanks

> On May 10, 2017, at 1:50 PM, Philip A Cook <coo...@mail.med.upenn.edu> wrote:
> 
> Thanks Michael, we have release 1.0.2. I will try 1.0.3
> 
> 
>> On May 9, 2017, at 5:27 PM, Harms, Michael <mha...@wustl.edu> wrote:
>> 
>> 
>> The Prisma coefficient file contains more harmonics than the original
>> gradient_unwarp.py could handle.
>> Although, I thought that we had fixed that in the version that we are
>> hosting on github…
>> (Tim Brown?)
>> 
>> --
>> Michael Harms, Ph.D.
>> 
>> -----------------------------------------------------------
>> Conte Center for the Neuroscience of Mental Disorders
>> Washington University School of Medicine
>> Department of Psychiatry, Box 8134
>> 660 South Euclid Ave.Tel: 314-747-6173
>> St. Louis, MO  63110Email: mha...@wustl.edu
>> 
>> 
>> 
>> 
>> On 5/9/17, 3:57 PM, "hcp-users-boun...@humanconnectome.org on behalf of
>> Philip A Cook" <hcp-users-boun...@humanconnectome.org on behalf of
>> coo...@mail.med.upenn.edu> wrote:
>> 
>> Hi,
>> 
>> I was trying to do gradient nonlinearity correction as part of the
>> structural pre-processing pipeline, which failed. Calling
>> gradient_unwarp.py independently produces the same error:
>> 
>> gradient_unwarp.py T1w.nii.gz trilinear.nii.gz siemens -g coeff.grad -n
>> 
>> gradient_unwarp.py fails to read the file, the output is:
>> 
>> gradunwarp-INFO: Parsing coeff.grad for harmonics coeffs
>> Traceback (most recent call last):
>> File "/share/apps/python/Python-2.7.9/bin/gradient_unwarp.py", line 122,
>> in <module>
>>   grad_unwarp.run()
>> File "/share/apps/python/Python-2.7.9/bin/gradient_unwarp.py", line 91,
>> in run
>>   self.args.gradfile)
>> File
>> "/share/apps/python/Python-2.7.9/lib/python2.7/site-packages/gradunwarp/cor
>> e/coeffs.py", line 30, in get_coefficients
>>   return get_siemens_grad(cfile)
>> File
>> "/share/apps/python/Python-2.7.9/lib/python2.7/site-packages/gradunwarp/cor
>> e/coeffs.py", line 194, in get_siemens_grad
>>   R0_m, max_ind = grad_file_parse(gfile, txt_var_map)
>> File
>> "/share/apps/python/Python-2.7.9/lib/python2.7/site-packages/gradunwarp/cor
>> e/coeffs.py", line 159, in grad_file_parse
>>   txt_var_map['Alpha_z'][x,y] = float(line.split()[-2])
>> IndexError: index 15 is out of bounds for axis 0 with size 14
>> 
>> We have gradunwarp installed from
>> 
>> https://github.com/Washington-University/gradunwarp
>> 
>> I can successfully correct T1w images from Lifespan pilot data, using the
>> Skyra .grad file:
>> 
>> gradient_unwarp.py T1w.nii.gz trilinear.nii.gz siemens -g
>> coeff_SC72C_Skyra.grad -n
>> 
>> So I think the gradunwarp install is OK. I think the Prisma coeff file is
>> also correct, as we've checked it against the same file from another
>> scanner. Has anyone managed to do the GDC with Prisma coeffs?
>> 
>> 
>> Thanks
>> 
>> 
>> 
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