# Defining ROI dimensions and position

**URL:** <https://discourse.slicer.org/t/defining-roi-dimensions-and-position/3279>\
**Category:** Support\
**Tags:** annotations\
**Created:** [June 25, 2018, 4:13pm UTC](https://discourse.slicer.org/t/defining-roi-dimensions-and-position/3279 "2018-06-25T16:13:45Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![stevenagl12](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/stevenagl12/32/3391_2.png) [@stevenagl12](https://discourse.slicer.org/u/stevenagl12)\
**Post date:** [June 25, 2018, 4:13pm UTC](https://discourse.slicer.org/t/defining-roi-dimensions-and-position/3279/1 "2018-06-25T16:13:45Z")

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Hi, I was wondering if there is a way to define the dimensions and position of an ROI exactly either programmatically or through a given module? I am trying to do it more efficiently than dropping the ROI points and manually manipulating them.

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**Author:** ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Post date:** [June 25, 2018, 4:30pm UTC](https://discourse.slicer.org/t/defining-roi-dimensions-and-position/3279/2 "2018-06-25T16:30:23Z")

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You can edit ROI position and size using Annotations module:

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/b/e/bea29daee9bfb40c3016c7752b551018d5d1d95b.png)

You can set ROI position and size by modifying the corresponding vtkMRMLAnnotationROINode node.