# Select the dimension of a ROI in a range of selected slices

**URL:** <https://discourse.slicer.org/t/select-the-dimension-of-a-roi-in-a-range-of-selected-slices/25571>\
**Category:** Support\
**Created:** [October 6, 2022, 10:19am UTC](https://discourse.slicer.org/t/select-the-dimension-of-a-roi-in-a-range-of-selected-slices/25571 "2022-10-06T10:19:10Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Francesca\_Lo\_Iacono](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/francesca_lo_iacono/32/13557_2.png) [@Francesca\_Lo\_Iacono](https://discourse.slicer.org/u/Francesca_Lo_Iacono)\
**Post date:** [October 6, 2022, 10:19am UTC](https://discourse.slicer.org/t/select-the-dimension-of-a-roi-in-a-range-of-selected-slices/25571/1 "2022-10-06T10:19:10Z")

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Operating system: macOS Monterey 12.5.1  
Slicer version: 4.13

Hi!

I need to segment a ROI (a round or square of specific dimension), located in the same position, in selected slices. I tried to use scissor but I have two problems:  
1- I cannot control scissor cutting dimension  
2. I cannot select the first and the last slice in which apply the segmentation.

Someone can help me please?

Thanks

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**Author:** ![pieper](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/pieper/32/8_2.png) [@pieper](https://discourse.slicer.org/u/pieper)\
**Post date:** [October 6, 2022, 12:45pm UTC](https://discourse.slicer.org/t/select-the-dimension-of-a-roi-in-a-range-of-selected-slices/25571/2 "2022-10-06T12:45:11Z")

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This sounds doable with a little python code to control the parameters.