ACR MRI test error

General
1

Hello,

I am new using Pylinac and I want to implement it on my MRidian accelerator to perform quality checks.

I have tested with a set of 11 MRI images on the ACR Phantom, as specified in the manual, but when running the results analysis I get the following error:

Traceback (most recent call last):

File “C:\Users\USER\AppData\Local\Programs\Python\Python310\lib\site-packages\spyder_kernels\customize\spyderpdb.py”, line 776, in run
super(SpyderPdb, self).run(cmd, globals, locals)

File “C:\Users\USER\AppData\Local\Programs\Python\Python310\lib\bdb.py”, line 597, in run
exec(cmd, globals, locals)

File “c:\users\user\desktop\acr test rmn\acr.py”, line 19, in
mri.analyze()

File “C:\Users\USER\AppData\Local\Programs\Python\Python310\lib\site-packages\pylinac\acr.py”, line 969, in analyze
self.uniformity_module = MRUniformityModule(

File “C:\Users\USER\AppData\Local\Programs\Python\Python310\lib\site-packages\pylinac\acr.py”, line 719, in init
super().init(catphan, tolerance=None, offset=offset)

File “C:\Users\USER\AppData\Local\Programs\Python\Python310\lib\site-packages\pylinac\ct.py”, line 350, in init
Slice.init(

File “C:\Users\USER\AppData\Local\Programs\Python\Python310\lib\site-packages\pylinac\ct.py”, line 267, in init
array = combine_surrounding_slices(

File “C:\Users\USER\AppData\Local\Programs\Python\Python310\lib\site-packages\pylinac\ct.py”, line 2195, in combine_surrounding_slices
arrays = tuple(dicomstack[s].array for s in slices)

File “C:\Users\USER\AppData\Local\Programs\Python\Python310\lib\site-packages\pylinac\ct.py”, line 2195, in
arrays = tuple(dicomstack[s].array for s in slices)

File “C:\Users\USER\AppData\Local\Programs\Python\Python310\lib\site-packages\pylinac\core\image.py”, line 1241, in getitem
return self.images[item]

IndexError: list index out of range

Thanks in advance for your help

2

I’ve not seen or tried to analyze images from a MRIdian. You can donate the images here: https://forms.gle/ohjCDQMQT83Nwgrj6

3

Hi,

FinFinally the bug was fixed by forcing the upgrade to the latest version of Pylinac.

Anyway, I share the images obtained by Mridian so that you can analyze them and check the correlation between images obtained with a MR and those obtained from Mridian machine. If you need more sets of images, please let me know and I will share them as soon as possible.

For the tests implemented in the ACR module, are there defined tolerance intervals for the results obtained using pylinac?

Thanks in advance