How to specify image dimensions for reconstructed images

[roshtha]

Hello,

I run SART algorithm for reconstructing images. I understand that the function dataPreprocess resizes the projection data to contain only the needed object and SART algorithm reconstructs images to this projection data size. I have a few questions:

How can I set image dimensions (widthxheight) for reconstructed images? For example I have detector panel pixel density as

parameter.nu = 2816;    
parameter.nv = 3584;

But want to get reconstructed images in dimenstions of 803x1127 (WidthxHeight). How can I specify image dimensions?

Second question is regarding function dataPreprocess. The segmentation crops projection data and we loose information from the removed part. How can we get information from this part for the reconstructed images?

It would be very helpful if you can provide some inputs on this.

Thanks.

[rodrigovimieiro]

Hello

Regarding your questions:

1. You might change these parameters for volume configuration:

% Breast voxels density
parameter.nx = 803;    % number of voxels (columns)
parameter.ny = 1127;    % number of voxels (rows)

% Single voxel real size (mm)
parameter.dx = 0.112;   % Change this parameter according to your equipment configuration
parameter.dy = 0.112;

2. You can change this part from your dataPreprocess code:

% data_mod = data(:,Ind:end,:);
data_mod = data(:,:,:);

This cropping is just for speed purposes.

Let me know if it works for you.

[roshtha]

Thanks for the reply. I could reconstruct images in specified image dimensions.

Now regarding the segmentation part, I also want to crop the projection data to reduce reconstruction time. But also want background information from the removed part to have a more realistic image view in the reconstructed images.

Is it a correct approach to run a one-iteration SART on removed projection data and then blend the images of segmented and cropped out projection parts for final images?

[rodrigovimieiro]

It depends what you call "correct". This approach seems reasonable to me because we don't care that much with this background information. You could also set it all to 0.

Good luck :)

[fettahyildizz]

Hi @roshtha , could you please share your e-mail with me? We have some problems that we are unable to find answers. Thanks in advance.

[fettahyildizz]

or you can just e-mail me: fettah409@gmail.com

[rodrigovimieiro]

or you can just e-mail me: fettah409@gmail.com

Hello Fettah, I just answered your e-mail.