Does different image parameters affect image registration?

2 次查看（过去 30 天）
Colleen
Colleen 2013-10-3
评论： Alex Taylor 2013-10-8
I am currently trying to register 2, 3D CT images of a human tibia. I have implemented imregister to complete this task. When I register the right to left leg of the same individual from the same day, the registration is excellent. However, when I register the left leg to the left leg of the same individual 3 years later the registration is very poor. The CT collected a slice every 0.4mm but I noticed that the image spacing was different in the other 2 planes. One CT scan had image spacing of 0.156 x 0.156 x 0.4 while the other was 0.195 x 0.195 x 0.4. Could this explain the poor registration? Is there a way to specific the image spacing to improve the registration? Please let me know if my question is unclear or if you need more information/code/images. Thank you.

请先登录，再回答此问题。

采纳的回答

Alex Taylor
Alex Taylor 2013-10-4
编辑：Alex Taylor 2013-10-4
Hi Colleen, I would recommend you take a look at the following example that ships with the Image Processing Toolbox:
http://www.mathworks.com/help/images/examples/registering-multimodal-3-d-medical-images.html
It shows how spatial referencing objects can be used to specify the resolution of your images in each dimension and improve 3-D registration results with imregister.
In your case, the first CT image you described would have a spatial referencing object defined as:
Rct = imref3d(size(yourImage), 0.156, 0.156, 0.4);
Where yourImage is the variable that contains the first CT image.
Passing spatial referencing information can be very useful in getting imregister/imregtform to converge.
  2 个评论
Colleen
Colleen 2013-10-6
Hi Alex, this worked very well and solved my problem! Now, the registration is very good. Thanks for all your help and the suggested example. It was very helpful.
Alex Taylor
Alex Taylor 2013-10-8
Collen,
I'm happy to hear that! Thanks for letting me know it worked out.

请先登录，再进行评论。

更多回答（1 个）

Ashish Uthama
Ashish Uthama 2013-10-3
Difference in spatial resolution differece might explain the poor registration.
You could specify the image spacing using using imref3d and use it with imregister.

类别

在 Help Center 和 File Exchange 中查找有关 Geometric Transformation and Image Registration 的更多信息

标签

产品

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by