Cropping of the dataset

[ZhaiJiaKai]

Hello author, if you use the dataset size of transmorph, will it report an error of insufficient memory when training your model? Cropping the dataset to the dimensions in your paper, are they only applicable to your method or transmorph as well?

[MungoMeng]

Hi, thanks for your interests in our work!

The image size used in the TransMorph paper is larger than ours (160/192/224 vs 144/192/160), resulting in larger GPU memory consumption. If you focus only on deformable registration of brain images, 144/192/160 is large enough to include the whole brain, as all brain image has been affine-registered with the MNI-152 brain template (i.e., they are located in the same position and all brains have a similar size less than 144/192/160). TransMorph used a larger image size possibly because they also aimed to solve affine registration within the network, which means the input image space should be larger to provide more space allowing for global movements of brains.

Anyway, both TransMorph and CorrMLP are not bounded to any specific image size, so our image size can be used in TransMorph (This is what we did in our experiments). TransMorph's image size also could be used in CorrMLP if there are larger GPUs or the feature channel numbers (enc_channels and dec_channels) are appropriately adjusted.

[ZhaiJiaKai]

Hi, thanks for your interests in our work!

The image size used in the TransMorph paper is larger than ours (160/192/224 vs 144/192/160), resulting in larger GPU memory consumption. If you focus only on deformable registration of brain images, 144/192/160 is large enough to include the whole brain, as all brain image has been affine-registered with the MNI-152 brain template (i.e., they are located in the same position and all brains have a similar size less than 144/192/160). TransMorph used a larger image size possibly because they also aimed to solve affine registration within the network, which means the input image space should be larger to provide more space allowing for global movements of brains.

Anyway, both TransMorph and CorrMLP are not bounded to any specific image size, so our image size can be used in TransMorph (This is what we did in our experiments). TransMorph's image size also could be used in CorrMLP if there are larger GPUs or the feature channel numbers (enc_channels and dec_channels) are appropriately adjusted.

Thank you very much for your reply and answer! I have another question. When I crop the image, can I directly crop it from the image size (160, 192, 224) used by transmorph to (144, 192, 160)? Will this have any effect? ​​Will reducing the number of enc_channels and dec_channels have a bad effect on the experimental results? Thank you again for taking the time to answer my questions!

[MungoMeng]

When I crop the image, can I directly crop it from the image size (160, 192, 224) used by transmorph to (144, 192, 160)? Will this have any effect?

You need to first check whether the images in size (160, 192, 224) are affine-registered. If they have been registered into the same position (e.g., registered with an atlas), you can directly crop them into (144, 192, 160) by choosing a fixed cropping position, i.e., [x1:x2, y1:y2, z1:z2]. This usually will not incur negative effects, as deformable registration only causes local movement of image pixels and (144, 192, 160) is large enough to include the whole brain and its local deformations.

Will reducing the number of enc_channels and dec_channels have a bad effect on the experimental results?

This will reduce the overall parameter number/model size and surely will slightly degrade the performance. Even so, the degraded performance still should be better than TransMorph because the improvements of CorrMLP are not attrbuted to using more parameters.

[ZhaiJiaKai]

裁剪图片时，是否可以直接从 transmorph 使用的图像大小 （160， 192， 224） 裁剪为 （144， 192， 160）？这会产生任何影响吗？

您需要首先检查大小为 （160， 192， 224） 的图像是否是仿射配准的。如果它们已注册到同一位置（例如，已注册到图集），则可以通过选择固定裁剪位置（即 [x1：x2， y1：y2， z1：z2]）直接将它们裁剪为 （144， 192， 160）。这通常不会产生负面影响，因为可变形配准只会导致图像像素的局部移动，并且 （144， 192， 160） 大到足以包括整个大脑及其局部变形。

减少 enc_channels 和 dec_channels 的数量会对实验结果产生不良影响吗？

这将减少总体参数数量/模型大小，并且肯定会略微降低性能。即便如此，降级的性能仍然应该比 TransMorph 好，因为 CorrMLP 的改进并不能归因于使用更多参数。

Thank you very much for your reply

[ZhaiJiaKai]

裁剪图片时，是否可以直接从 transmorph 使用的图像大小 （160， 192， 224） 裁剪为 （144， 192， 160）？这会产生任何影响吗？

您需要首先检查大小为 （160， 192， 224） 的图像是否是仿射配准的。如果它们已注册到同一位置（例如，已注册到图集），则可以通过选择固定裁剪位置（即 [x1：x2， y1：y2， z1：z2]）直接将它们裁剪为 （144， 192， 160）。这通常不会产生负面影响，因为可变形配准只会导致图像像素的局部移动，并且 （144， 192， 160） 大到足以包括整个大脑及其局部变形。 Excuse me again, could you please give me the starting point for cropping the image? I would be grateful!

减少 enc_channels 和 dec_channels 的数量会对实验结果产生不良影响吗？

这将减少总体参数数量/模型大小，并且肯定会略微降低性能。即便如此，降级的性能仍然应该比 TransMorph 好，因为 CorrMLP 的改进并不能归因于使用更多参数。

Excuse me again, could you please give me the starting point for cropping the image? I would be grateful!

[MungoMeng]

Excuse me again, could you please give me the starting point for cropping the image? I would be grateful!

This starting points are different for different datasets and different pre-affine registration settings. Think about this: If the images were affine-registered to different positions, the starting points are accordingly different. You should set the starting points for your datasets manually, e.g., with eye check.

[ZhaiJiaKai]

I modified the size directly to (160,192,224), but perhaps this size is not suitable for finding a suitable starting point because it has already been cropped. So I was thinking whether I should find the starting point for cropping in the original image size or use a larger memory to train the image of size (160,192,224). I am confused, can you give me some advice? ---- Replied Message ---- | From | Mingyuan @.> | | Date | 09/04/2024 16:56 | | To | MungoMeng/Registration-CorrMLP @.> | | Cc | ZhaiJiaKai @.>, Author @.> | | Subject | Re: [MungoMeng/Registration-CorrMLP] Cropping of the dataset (Issue #7) |

Excuse me again, could you please give me the starting point for cropping the image? I would be grateful!

This starting points are different for different datasets and different pre-affine registration settings. Think about this: If the images were affine-registered to different positions, the starting points are accordingly different. You should set the starting points for your datasets manually, e.g., with eye check.

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[MungoMeng]

I think it doesn't matter whether you find the starting points from the cropped image (160,192,224) or from the original images. If all images have been affine-registered (to the same position), you can find appropriate starting points for cropping. As cropping just removes some black background and will not change the image resolution or content, you can always crop the images again after cropping.

[ZhaiJiaKai]

Thank you for your answer.！ ---- Replied Message ---- | From | Mingyuan @.> | | Date | 09/04/2024 17:41 | | To | MungoMeng/Registration-CorrMLP @.> | | Cc | ZhaiJiaKai @.>, Author @.> | | Subject | Re: [MungoMeng/Registration-CorrMLP] Cropping of the dataset (Issue #7) |

I think it doesn't matter whether you find the starting points from the cropped image (160,192,224) or from the original images. If all images have been affine-registered (to the same position), you can find appropriate starting points for cropping. As cropping just removes some black background and will not change the image resolution or content, you can always crop the images again after cropping.

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