registration between masks

[Seohan]

Hi Plastimatch users,

I was trying to register a RTSTRUCT mask to another one.

The mask.nii is 3D array containing 0,1 along with the organ contour.

I used demons method like following:

[GLOBAL]

fixed = mask_fx.nii

moving = mask_mv.nii

image_out = out.nii

vf_out = vf_out.nii

[STAGE]

xform = vf

optim = demons

impl = plastimatch

demons_std = 3

demons_acceleration = 1

max_its = 500

res = 2 2 1

This code yielded an error "unhandled conversion from PLM_IMG_TYPE_ITK_INT64 to itk_float"

Additionally, I tried to warp a mask.nii using transformation vf. This try also made an same error. How can I deal with this issue?

I'll be happy to any advice.

[Sharp, Gregory C.]

Hi Seohan,

 

Looks like one or both of your images is a 64-bit integer.  Probably you don’t need that for a mask.

You can convert it to an unsigned char like this:

 

plastimatch convert --input mask_fx.nii --output mask_fx_2.nii --output-type uchar

 

I’ll try to fix this in a future release to do the conversion automatically.

 

Greg

 

From: plast...@googlegroups.com <plast...@googlegroups.com> On Behalf Of Seohan
Sent: Wednesday, June 14, 2023 7:21 AM
To: Plastimatch <plast...@googlegroups.com>
Subject: [Plastimatch] registration between masks

 

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[Seohan]

Hi Greg!

Thank you for your prompt reply.

Now it works!!

Seohan

FYI:

I leave a solution code for those who probably face this issue I met.

I revised "--output" to "--output-img".

plastimatch convert --input mask_fx.nii --output-img mask_fx_2.nii --output-type uchar

2023년 6월 15일 목요일 오전 12시 14분 17초 UTC+9에 Sharp, Gregory C.님이 작성: