# parameter tuning

**URL:** <https://discourse.itk.org/t/parameter-tuning/7442>\
**Category:** Algorithms\
**Tags:** itk\
**Created:** [February 20, 2025, 3:27am UTC](https://discourse.itk.org/t/parameter-tuning/7442 "2025-02-20T03:27:49Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![zhangxiang](https://discourse.itk.org/letter_avatar_proxy/v4/letter/z/c77e96/32.png) [@zhangxiang](https://discourse.itk.org/u/zhangxiang)\
**Post date:** [February 20, 2025, 3:27am UTC](https://discourse.itk.org/t/parameter-tuning/7442/1 "2025-02-20T03:27:50Z")

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![image](https://discourse.itk.org/uploads/default/original/2X/9/946c0c00c643a8c6ff060ce75e6eea9e549f2547.jpeg)  
 ![T2(7N7C}Y}V~0M_K(CGQ1X](https://discourse.itk.org/uploads/default/original/2X/1/1dae612ce751a50d5e547b25ef8dcc19622991d8.jpeg)

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How can I choose the appropriate parameters of filters, such as Hann hannY multiplier radius.

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When I run rtkfdk.exe with these parameter input, my CPU go to 100％, I have to close cuda acceleration. subsetsize didn’t work. I have to use --lowmem. But running rtkfdk with --lowmem have a very slow speed.

@simon.rit

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**Author:** ![zhangxiang](https://discourse.itk.org/letter_avatar_proxy/v4/letter/z/c77e96/32.png) [@zhangxiang](https://discourse.itk.org/u/zhangxiang)\
**Post date:** [February 20, 2025, 3:34am UTC](https://discourse.itk.org/t/parameter-tuning/7442/2 "2025-02-20T03:34:42Z")

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THE image size and pixel size of 2D IMAGE is 768×768 and 0.56mm/pixel

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**Author:** ![simon.rit](https://discourse.itk.org/letter_avatar_proxy/v4/letter/s/f08c70/32.png) [@simon.rit](https://discourse.itk.org/u/simon.rit)\
**Post date:** [February 20, 2025, 8:02am UTC](https://discourse.itk.org/t/parameter-tuning/7442/3 "2025-02-20T08:02:39Z")

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1. Hann windowing is a trade off between spatial resolution and noise. There is no good answer, you need to test several values and adapt it to your needs.
2. I don’t fully get the issue… The issue description seems to be a mix between CPU usage and memory consumption. Use lowmem if you want to reduce the memory footprint. Yes, it can decrease a bit the performances. In any case, tomographic reconstruction uses computing ressources, there is no alternative…

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**Author:** ![zhangxiang](https://discourse.itk.org/letter_avatar_proxy/v4/letter/z/c77e96/32.png) [@zhangxiang](https://discourse.itk.org/u/zhangxiang)\
**Post date:** [February 21, 2025, 12:45am UTC](https://discourse.itk.org/t/parameter-tuning/7442/4 "2025-02-21T00:45:04Z")

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THANK YOU.