# How does the crosshair tool work on different series?

**URL:** <https://discourse.slicer.org/t/how-does-the-crosshair-tool-work-on-different-series/27205>\
**Category:** Support\
**Created:** [January 12, 2023, 12:32pm UTC](https://discourse.slicer.org/t/how-does-the-crosshair-tool-work-on-different-series/27205 "2023-01-12T12:32:32Z")\
**Posts on this page:** 8\
**Page:** 1

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**Author:** ![francesca\_flore](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/francesca_flore/32/15307_2.png) [@francesca\_flore](https://discourse.slicer.org/u/francesca_flore)\
**Post date:** [January 12, 2023, 12:32pm UTC](https://discourse.slicer.org/t/how-does-the-crosshair-tool-work-on-different-series/27205/1 "2023-01-12T12:32:32Z")

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Since I have 3 series, each of which has a high quality view and the other two low quality views, I display in 3D slicer the three best resolution planes chosen from the 3 series.  
If I crosshair and select a point in a plane, will it cause other Slice Viewers to scroll to the same position? Even if these come from 3 different series?

 ![Screenshot_3](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/c/1/c1c2bba21871500dac95aab55305d2b12b2c4bdb.jpeg)

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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:** [January 12, 2023, 11:25pm UTC](https://discourse.slicer.org/t/how-does-the-crosshair-tool-work-on-different-series/27205/2 "2023-01-12T23:25:32Z")

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Yes, the crosshair makes slice views jump to the same physical position.

The 3 orthogonal MRI series are usually reconstructed at the same time and they are accurately aligned in physical space, so everything should nicely line up.

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**Author:** ![francesca\_flore](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/francesca_flore/32/15307_2.png) [@francesca\_flore](https://discourse.slicer.org/u/francesca_flore)\
**Post date:** [January 13, 2023, 8:23am UTC](https://discourse.slicer.org/t/how-does-the-crosshair-tool-work-on-different-series/27205/3 "2023-01-13T08:23:03Z")

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Even if the 3 series have a different slice thickness?

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<div class="post-metadata">

**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:** [January 13, 2023, 12:24pm UTC](https://discourse.slicer.org/t/how-does-the-crosshair-tool-work-on-different-series/27205/4 "2023-01-13T12:24:33Z")

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Yes. Slicer performs all vísualization and processing in physical space, so it can work seamlessly with images with different origin, spacing, and axis directions.

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**Author:** ![francesca\_flore](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/francesca_flore/32/15307_2.png) [@francesca\_flore](https://discourse.slicer.org/u/francesca_flore)\
**Post date:** [January 13, 2023, 12:34pm UTC](https://discourse.slicer.org/t/how-does-the-crosshair-tool-work-on-different-series/27205/5 "2023-01-13T12:34:04Z")

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Thanks! I have an other question…Why ImageDimensions are not the same in Volumes module and in metadata? It seems that 3D slicer defaults to 512x512 for all the series.

 ![Untitled](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/3/f/3f7caf771c7cdd9c86cf6c74719d21c5b8cca8ad.png)

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<div class="post-metadata">

**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:** [January 13, 2023, 1:30pm UTC](https://discourse.slicer.org/t/how-does-the-crosshair-tool-work-on-different-series/27205/6 "2023-01-13T13:30:59Z")

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(0027,1060) and (0027,1061) are just some GE private fields. They are not needed for image reconstruction. Number of pixels in a slice are stored in standard fields (0028,0010) and (0028,0011).

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**Author:** ![francesca\_flore](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/francesca_flore/32/15307_2.png) [@francesca\_flore](https://discourse.slicer.org/u/francesca_flore)\
**Post date:** [January 13, 2023, 1:48pm UTC](https://discourse.slicer.org/t/how-does-the-crosshair-tool-work-on-different-series/27205/7 "2023-01-13T13:48:58Z")

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So if I have ImageDimension(0028,0010 and 0028,0011) of 512x512 and PixelSpacing (0028,0030) of 0.4688x0.4688, the real size of my image will be 240.0256 mm x 240.0256 mm. Correct?

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<div class="post-metadata">

**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:** [January 13, 2023, 3:59pm UTC](https://discourse.slicer.org/t/how-does-the-crosshair-tool-work-on-different-series/27205/8 "2023-01-13T15:59:57Z")

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Yes, that’s correct.