Hi, While drawing annotation ROIs on a volume using freehand segmentation editor, sometimes the annotation does not draw altogether. If i delete the segmentation and create a new one , it will start working. I was able to save a mrml scene with the erratic segment map (named ‘HUM_PT1_LTlVL2’) with …

[image] drusmanbashir: While drawing annotation ROIs on a volume using freehand segmentation editor, sometimes the annotation does not draw altogether. By “annotation does not draw” do you mean segment editor paint effect does not paint on the image? This can happen if the resolution of the b…

I realised that. But in the case I have mentioned (and in that particular scene) no matter how many times i create the segmentation and define the first master volume to be the intended one, it won’t draw on it (not using paint effect btw). I did work around it by loading the volumes one by one in t…

It may be possible that there are non-axis aligned or tilted gantry acquisitions. Can you send the scene (upload to dropbox, onedrive, google drive, etc. and post the link here) so that I can have a look? Only the draw tool has problems, or paint tool as well? If you enable sphere shape for the pai…

Hi Andras, Here is the link [image] Dropbox - File Deleted Dropbox is a free service that lets you bring your photos, docs, and videos anywhere and share them easily. Never email yourself a file again! A single segmentation map is saved in this folder. If i…

Hi, It seems the problem switches between contouring tools, at times I am able to use paint when freehand is not working and a few slices down it will alternate, i.e., freehand will start working and paint will stop. I hope this helps.

Your red slice view was aligned right between two axial slices. [image] In these cases, due to rounding errors it may be possible that you see a different slice than you are drawing at. [image] To fix this, use Shift+MouseMove to reposition your slice view in a sagittal or coronal view, to not…

Yes, this can be an issue when there are an even number of slices in the view direction (the default fit exactly centers). In the old Editor all labeling tools (draw, paint, etc) have this in the constructor for that very reason: Slicer/Slicer/blob/master/Modules/Scripted/EditorLib/LabelEf…

Slicer is proving quite a minefield of ‘gotchas’ . I think i understand the workaround. Thanks for the help

Yes, in Slicer usually you are free to do whatever you want - but this can certainly make things more complicated and you may need to learn more than what you wanted to. To make the slider behavior more clear, we planned to distinguish interpolated and slice-centered mode, but it hasn’t been implem…

The only thing with this workaround is - if i have a different image-volume open in the saggital or cooronal view and i try pressing the shift key and (I see that they do some kind of alignment), does that still work or must i have the same volume open in the other window but in a different orientat…

Sometimes freehand drawing does not work in Segment editor

Support

Topic		Replies	Views
Free hand drawing is not working effectively in slicer Support	4	1269	January 13, 2019
Paint segmentation not filling slice after ROI and rotate to volume plane Support	13	2333	January 31, 2018
Problem with segment editor paint Support segmentation	16	3403	July 5, 2024
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Slicer is automatically cutting the annotations on the CT slices and not letting me draw the desired Region of interest Support	0	503	January 13, 2019

Sometimes freehand drawing does not work in Segment editor

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