Rank: 1998 based on 60 downloads (last 30 days) and 2 files submitted
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Patrick Granton

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Maastro CLinic, University Maastricht

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Ph.D. Candidate in Radiation Therapy at the Department of Oncology, University Maastricht


 

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Files Posted by Patrick Granton View all
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11 Oct 2013 Find neighbouring voxels Very simple function to find the 26 (or less) neighbouring indices of an voxel in a 3-D volume. Author: Patrick Granton image processing 5 0
03 Sep 2010 Screenshot Slant Edge Script This code can be used to measure the pre-sampled MTF of an image. Author: Patrick Granton mtf, otf, modulation transfer f..., optical transfer func..., slant edge, line spread function 55 15
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3.4 | 8 ratings
Comments and Ratings by Patrick Granton View all
Updated File Comments Rating
04 Dec 2014 Slant Edge Script This code can be used to measure the pre-sampled MTF of an image. Author: Patrick Granton

* Feel free to tinker everyone... perhaps I'll revisit this script and re-write to more common code practices.

25 Nov 2012 Slant Edge Script This code can be used to measure the pre-sampled MTF of an image. Author: Patrick Granton

Pierre, I fixed some issues with the cropping of the image and have made it a GUI for more easy of use. Perhaps this might help you.

27 Sep 2010 Multithreaded mex FDK conebeam CT reconstruction algorithm A multithreaded (Windows) mex implementation of the FDK conebeam CT reconstruction algorithm. Author: Rene Willemink

Could you be add a vector to your C++ code to include angle data as an input by any chance?
Thanks

Comments and Ratings on Patrick Granton's Files View all
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15 Dec 2014 Slant Edge Script This code can be used to measure the pre-sampled MTF of an image. Author: Patrick Granton Eamon Loughman

What type of smoothing would marcelo or rachel reccomend?

Having done some tinkering with wiener and Gaussian filtering of the image files, I still seem to hit errors?

Very well written in all other respects!

04 Dec 2014 Slant Edge Script This code can be used to measure the pre-sampled MTF of an image. Author: Patrick Granton Patrick Granton

* Feel free to tinker everyone... perhaps I'll revisit this script and re-write to more common code practices.

04 Dec 2014 Slant Edge Script This code can be used to measure the pre-sampled MTF of an image. Author: Patrick Granton Marcelo Soto Thompson

Agree with Rachel.This script is not very robust to noise.

I have also found it to crash if the edge is very blurry ie extends over many (50 or so) pixels.

Also, it's always unfortunate and poor practice to name variables the same as built-in functions (e.g "image").

Having said that, with a little tinkering this script is quite nice and will get the job done.

03 Dec 2014 Slant Edge Script This code can be used to measure the pre-sampled MTF of an image. Author: Patrick Granton Rachel

I've been creating my own MTF script, and I wanted to compare my results to yours. However, because my slanted edge must include noise for what I'm testing, I am unable to use your program. The issue happens at line 218, because to find the edge you use interp1, and the variable "strip_cropped" is not monotonic increasing due to the noise in my image. Perhaps you could use a different smoothing method, or use thresholding before finding the subpixel edge. Otherwise, everything else looks like it would work great!

25 Oct 2014 Slant Edge Script This code can be used to measure the pre-sampled MTF of an image. Author: Patrick Granton Karbala'a Unvi. Science

hi there i need the slant wave let for the image and what is the result needed urgently

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