Winston Lutz module Error

[谷本祐樹]

Hi all

We are currently analyzing Winston Lutz.

However, I get the following error:

 

’’’Unable to locate the BB. Make sure the field edges do not obscure the BB and that there is no artifacts in the images.’’’

But in Python, BB is not displayed, but in ImageJ, BB is displayed.

Can anyone please tell me the solution?

Thanks

[Jeremy Donaghue]

I think your bb is too small.  I haven't had luck with the Varian one that's ~2 mm

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On Apr 4, 2021, at 10:14 AM, 谷本祐樹 <tanim...@gmail.com> wrote:



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<python.JPG>

<ImageJ.JPG>

[谷本祐樹]

Hi　Jeremy

Thanks for the reply.

It was a simple reason.
Let's analyze with a slightly larger BB.

Thank you

2021年4月4日日曜日 23:26:15 UTC+9 cano...@gmail.com:

[David Sinn]

Looks like the window and level is different in the two images.  There also appears so be vertical and horizontal etchings that may be confusing the algorithm.  I know I’ve tried using the SI Mimi phantom and it doesn’t work because of the other structures in the field

Sent from my iPhone

On Apr 4, 2021, at 8:38 AM, 谷本祐樹 <tanim...@gmail.com> wrote:



To view this discussion on the web visit https://groups.google.com/d/msgid/pylinac/0bbdcc11-6e2e-449a-8894-c11e224315fbn%40googlegroups.com.

[Jeremy Donaghue]

I didn't see it here, but I ran into issues with the internal lattice structure of 3d prints.  I haven't come back to 100% in fill yet.

Sent from my iPhone

On Apr 4, 2021, at 11:44 AM, David Sinn <sinn...@gmail.com> wrote:

Looks like the window and level is different in the two images.  There also appears so be vertical and horizontal etchings that may be confusing the algorithm.  I know I’ve tried using the SI Mimi phantom and it doesn’t work because of the other structures in the field

To view this discussion on the web visit https://groups.google.com/d/msgid/pylinac/E536E312-367C-448A-BF8B-B237C7D67479%40gmail.com.

[谷本祐樹]

Thank you everyone for your reply.

I plan to buy a 5mm tungsten sphere and analyze Winston Lutz.

We will also inform you of the results.

2021年4月5日月曜日 1:35:42 UTC+9 cano...@gmail.com:

[James Kerns]

You can change the expected size of the BB by changing this line: https://github.com/jrkerns/pylinac/blob/b5595276ea021740ce6f1a561fb0450997daef3f/pylinac/winston_lutz.py#L865. In the upcoming version you can do that a hair more easily: https://github.com/jrkerns/pylinac/pull/359