# Change default threshold while masking

**URL:** <https://discourse.slicer.org/t/change-default-threshold-while-masking/31416>\
**Category:** Support\
**Tags:** segmentation, threshold, masking\
**Created:** [August 29, 2023, 6:38am UTC](https://discourse.slicer.org/t/change-default-threshold-while-masking/31416 "2023-08-29T06:38:43Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![V11](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/v11/32/67322_2.png) [@V11](https://discourse.slicer.org/u/V11)\
**Post date:** [August 29, 2023, 6:38am UTC](https://discourse.slicer.org/t/change-default-threshold-while-masking/31416/1 "2023-08-29T06:38:43Z")

</div>

Operating system: Windows  
Slicer version: 5.0.3

I have multiple labels to be annotated in a CT volume. I use the Threshold tool followed by “Use for Masking” to paint the region of interest (ROI) .  
I want to know if there is a way to

1. preset the range of threshold say 100 HU to 1000 HU so that the annotator need not change it every time he/she clicks the Threshold button.  
Further, the threshold changes to default every time the label is changed. So, the threshold needs to be modified every time. is there a way to prevent this?
2. preset the brush diameter that is used for masking? It is 3% by default. Would like to change it to smaller diameter, say 1%.