# \#radiotherapy **URL:** https://discourse.slicer.org/tag/radiotherapy/152.md [Latest](https://discourse.slicer.org/latest.md) · [Categories](https://discourse.slicer.org/categories.md) · [Tags](https://discourse.slicer.org/tags.md) --- ## [New extension: RadReirradiation for radiotherapy reirradiation analysis and EQD2 dose accumulation](https://discourse.slicer.org/t/new-extension-radreirradiation-for-radiotherapy-reirradiation-analysis-and-eqd2-dose-accumulation/47028)
**Author:** [@LuisParedesOcampo](https://discourse.slicer.org/u/LuisParedesOcampo)\ **Replies:** 0\ **Last updated:** [May 14, 2026, 2:23pm UTC](https://discourse.slicer.org/t/new-extension-radreirradiation-for-radiotherapy-reirradiation-analysis-and-eqd2-dose-accumulation/47028 "2026-05-14T14:23:00Z")
Hi everyone, I’d like to introduce RadReirradiation, a new 3D Slicer extension designed to support clinical reirradiation workflows in radiotherapy. The extension provides the following features: • Voxel-by-voxel BED … --- ## [Viewing / Analysing RT Plans / Fields](https://discourse.slicer.org/t/viewing-analysing-rt-plans-fields/46683)
**Author:** [@AlexB](https://discourse.slicer.org/u/AlexB)\ **Replies:** 4\ **Last updated:** [April 9, 2026, 3:27am UTC](https://discourse.slicer.org/t/viewing-analysing-rt-plans-fields/46683 "2026-04-09T03:27:02Z")
Greetings, dear community! First off, thanks for this project–and for actively maintaining it. Now, I’d like to know if the program would cover my use-case, namely: Visualise dose distributions (in colour-wash mode) S… --- ## [📢 New 3D Slicer Extensions: KonfAI & IMPACT-Synth Reliable AI Synthetic CT and Segmentation with Integrated QA](https://discourse.slicer.org/t/new-3d-slicer-extensions-konfai-impact-synth-reliable-ai-synthetic-ct-and-segmentation-with-integrated-qa/46032)
**Author:** [@vboussot](https://discourse.slicer.org/u/vboussot)\ **Replies:** 0\ **Last updated:** [February 2, 2026, 2:55pm UTC](https://discourse.slicer.org/t/new-3d-slicer-extensions-konfai-impact-synth-reliable-ai-synthetic-ct-and-segmentation-with-integrated-qa/46032 "2026-02-02T14:55:13Z")
Dear All, We are happy to announce the release of two new open-source 3D Slicer extensions, KonfAI and IMPACT-Synth, which provide graphical interfaces to run AI tasks (such as segmentation and synthetic CT generation) … --- ## [How to change Dose (X-axis) increments on a Dose-Volume-Histogram?](https://discourse.slicer.org/t/how-to-change-dose-x-axis-increments-on-a-dose-volume-histogram/41505)
**Author:** [@Jeremy\_Fockenier](https://discourse.slicer.org/u/Jeremy_Fockenier)\ **Replies:** 1\ **Last updated:** [March 25, 2025, 6:57pm UTC](https://discourse.slicer.org/t/how-to-change-dose-x-axis-increments-on-a-dose-volume-histogram/41505 "2025-03-25T18:57:59Z")
Hello fellow Slicers, I am currently testing Monte-Carlo simulations on a synthetic lung with a proton beam (all input files are in DICOM) and am trying to output a DVH file. However, since the DVH program seems to only… --- ## [What is the best way to store data for a model, loaded from DICOM-RT ion plan file?](https://discourse.slicer.org/t/what-is-the-best-way-to-store-data-for-a-model-loaded-from-dicom-rt-ion-plan-file/40545)
**Author:** [@Mik](https://discourse.slicer.org/u/Mik)\ **Replies:** 0\ **Last updated:** [December 6, 2024, 12:27pm UTC](https://discourse.slicer.org/t/what-is-the-best-way-to-store-data-for-a-model-loaded-from-dicom-rt-ion-plan-file/40545 "2024-12-06T12:27:06Z")
Currently i’m working on loading and visualization of ion range compensator, which data is loaded from DICOM-RT ion plan file. The compensator volume data taken from the dicom file are very similar to image parameters: … --- ## [How to adjust DVH bin width?](https://discourse.slicer.org/t/how-to-adjust-dvh-bin-width/40088)
**Author:** [@wilbysl](https://discourse.slicer.org/u/wilbysl)\ **Replies:** 2\ **Last updated:** [November 20, 2024, 2:00pm UTC](https://discourse.slicer.org/t/how-to-adjust-dvh-bin-width/40088 "2024-11-20T14:00:25Z")
Hello. Can anyone tell me if it’s possible to change the bin width for DVHs in v5.6.2 of Slicer3D please? Many thanks --- ## [Dicom import RTSTRUCT that were exported from slicer](https://discourse.slicer.org/t/dicom-import-rtstruct-that-were-exported-from-slicer/36986)
**Author:** [@gleesoi](https://discourse.slicer.org/u/gleesoi)\ **Replies:** 2\ **Last updated:** [June 24, 2024, 8:15pm UTC](https://discourse.slicer.org/t/dicom-import-rtstruct-that-were-exported-from-slicer/36986 "2024-06-24T20:15:38Z")
Hi, new to slicer and working on a dicom workflow. I notice that importing my dicom ct and segments look fine in dicom apart from a body rind and couch roi. I then export the ct and contours in dicom to file. I then lo… --- ## [Convert .mhd dose volume to RTDose file and export](https://discourse.slicer.org/t/convert-mhd-dose-volume-to-rtdose-file-and-export/15696)
**Author:** [@p4perz](https://discourse.slicer.org/u/p4perz)\ **Replies:** 2\ **Last updated:** [March 4, 2024, 11:07pm UTC](https://discourse.slicer.org/t/convert-mhd-dose-volume-to-rtdose-file-and-export/15696 "2024-03-04T23:07:09Z")
The output of my Monte Carlo simulations for the dose distributions are multiple .mha dose volumes. I would aim to compare them to other dose distributions and overlap them with CT DICOMs. There are many tools availabl… --- ## [Isodose model is only 1 file for all of them](https://discourse.slicer.org/t/isodose-model-is-only-1-file-for-all-of-them/34395)
**Author:** [@LukasKnybel](https://discourse.slicer.org/u/LukasKnybel)\ **Replies:** 2\ **Last updated:** [February 20, 2024, 3:55pm UTC](https://discourse.slicer.org/t/isodose-model-is-only-1-file-for-all-of-them/34395 "2024-02-20T15:55:27Z")
Dear Slicer Users, I have Slicer 5.6.0 now with Radiotherapy module. When I generate isodoses from RTdose dicom file, only 1 model for all isodoses is created (looks like sum of all). In previous version of Slicer it w… --- ## [RT structure set has holes after exporting to labelmap](https://discourse.slicer.org/t/rt-structure-set-has-holes-after-exporting-to-labelmap/19625)
**Author:** [@liuhuaying](https://discourse.slicer.org/u/liuhuaying)\ **Replies:** 19\ **Last updated:** [October 11, 2023, 11:26am UTC](https://discourse.slicer.org/t/rt-structure-set-has-holes-after-exporting-to-labelmap/19625 "2023-10-11T11:26:50Z")
Hi, I‘m facing another problem when I perform these operations. After export labelmap, the labelmap I got is missing some information. this picture is before export this one is after export could u tell me why? T… --- ## [Radiation Therapy and AI assisted segmentation?](https://discourse.slicer.org/t/radiation-therapy-and-ai-assisted-segmentation/29475)
**Author:** [@Dave90](https://discourse.slicer.org/u/Dave90)\ **Replies:** 2\ **Last updated:** [May 16, 2023, 8:02pm UTC](https://discourse.slicer.org/t/radiation-therapy-and-ai-assisted-segmentation/29475 "2023-05-16T20:02:00Z")
Hi, I’m a radiation therapist that’s rather new in this space. I’m looking for any information on using slicers auto segmentation to get those defined contours into Radiation therapy planning software like Eclipse. I wa… --- ## [relative dose value in color legend/DVH](https://discourse.slicer.org/t/relative-dose-value-in-color-legend-dvh/29114)
**Author:** [@VVCJ](https://discourse.slicer.org/u/VVCJ)\ **Replies:** 0\ **Last updated:** [April 25, 2023, 11:14am UTC](https://discourse.slicer.org/t/relative-dose-value-in-color-legend-dvh/29114 "2023-04-25T11:14:39Z")
Hi all, I input the CT and RTDose data to review the dose distribution. By default, the color legend and DVH shows the absolute dose value (Gy) stored in RTDose.dcm. I was wondering if I could show the relative dose (%)… --- ## [Radiotherapy Rendering](https://discourse.slicer.org/t/radiotherapy-rendering/26271)
**Author:** [@Nafise\_Hasoomi](https://discourse.slicer.org/u/Nafise_Hasoomi)\ **Replies:** 6\ **Last updated:** [November 18, 2022, 11:31pm UTC](https://discourse.slicer.org/t/radiotherapy-rendering/26271 "2022-11-18T23:31:23Z")
Hello every one Thank you for your great software How can I use the segmentation features or use some rendering features after loading a radiotherapy machine? Does it need any programming, python input or any other act… --- ## [How should I use Contour Offset Vector (3006,0045)?](https://discourse.slicer.org/t/how-should-i-use-contour-offset-vector-3006-0045/26072)
**Author:** [@Alexandre\_Huat](https://discourse.slicer.org/u/Alexandre_Huat)\ **Replies:** 3\ **Last updated:** [November 17, 2022, 1:30pm UTC](https://discourse.slicer.org/t/how-should-i-use-contour-offset-vector-3006-0045/26072 "2022-11-17T13:30:08Z")
Hi, my colleague and I have read the doc of DICOM Data Element Contour Offset Vector but we don’t understand how we should exactly use it to correct the Contour Data of an RT Structure Set. The doc is ambiguous, it says: … --- ## [Slicer freezes when batch processing structures](https://discourse.slicer.org/t/slicer-freezes-when-batch-processing-structures/22547)
**Author:** [@JosephBae](https://discourse.slicer.org/u/JosephBae)\ **Replies:** 3\ **Last updated:** [March 16, 2022, 8:23pm UTC](https://discourse.slicer.org/t/slicer-freezes-when-batch-processing-structures/22547 "2022-03-16T20:23:32Z")
Hi! This is my first post in the forums, so please forgive if it is improperly placed. I’ve tried to search the forums a bit for this issue, and have definitely found some useful threads to get me to this point, but am n… --- ## [RT phantom drawing](https://discourse.slicer.org/t/rt-phantom-drawing/21189)
**Author:** [@naninano1](https://discourse.slicer.org/u/naninano1)\ **Replies:** 3\ **Last updated:** [December 24, 2021, 8:45pm UTC](https://discourse.slicer.org/t/rt-phantom-drawing/21189 "2021-12-24T20:45:09Z")
Hello, I want to draw a patient phantom with regular shapes (ellipse, sphere, cube, etc) as body, organs at risk, tumor, etc. as CT Dicom images, but I am not sure whether it is possible with Slicer 3d or not. I have s… --- ## [Dose will be distorted when creating isodose surfaces](https://discourse.slicer.org/t/dose-will-be-distorted-when-creating-isodose-surfaces/20129)
**Author:** [@Cody\_Xie](https://discourse.slicer.org/u/Cody_Xie)\ **Replies:** 3\ **Last updated:** [October 15, 2021, 7:40pm UTC](https://discourse.slicer.org/t/dose-will-be-distorted-when-creating-isodose-surfaces/20129 "2021-10-15T19:40:56Z")
Dear All, I am using SlicerRT plug-in, and I would like to create isodose surfaces. However, just after clicking “Create isodose surfaces”, I found that the dose was distorted automatically. The two screenshots below … --- ## [Problems importing RTStructs](https://discourse.slicer.org/t/problems-importing-rtstructs/6866)
**Author:** [@Alex\_Vergara](https://discourse.slicer.org/u/Alex_Vergara)\ **Replies:** 18\ **Last updated:** [August 31, 2021, 9:01am UTC](https://discourse.slicer.org/t/problems-importing-rtstructs/6866 "2021-08-31T09:01:51Z")
I have a serious problem while loading rtstructs. They are displayed correctly while loading as planar contours. So far so good: But when I want to use the binary labelmap they are completely destroyed. The s… --- ## [How to crop a DICOM 3D dose file and save it in a DICOM 3D dose file (not DICOM series)](https://discourse.slicer.org/t/how-to-crop-a-dicom-3d-dose-file-and-save-it-in-a-dicom-3d-dose-file-not-dicom-series/11873)
**Author:** [@vietlebao](https://discourse.slicer.org/u/vietlebao)\ **Replies:** 0\ **Last updated:** [June 5, 2020, 5:03am UTC](https://discourse.slicer.org/t/how-to-crop-a-dicom-3d-dose-file-and-save-it-in-a-dicom-3d-dose-file-not-dicom-series/11873 "2020-06-05T05:03:57Z")
Hi every one, I am cropping a DICOM dose file (single file) and then save it in a single DICOM dose file as well (not a DICOM series). I have a DICOM 3D dose (single file) file that inputs to 3D Slicer, then I crop it … --- ## [Problem in adding RT Dose volumes with SimpleFilters module](https://discourse.slicer.org/t/problem-in-adding-rt-dose-volumes-with-simplefilters-module/16223)
**Author:** [@aseman](https://discourse.slicer.org/u/aseman)\ **Replies:** 1\ **Last updated:** [February 26, 2021, 1:38pm UTC](https://discourse.slicer.org/t/problem-in-adding-rt-dose-volumes-with-simplefilters-module/16223 "2021-02-26T13:38:06Z")
Slicer version:4.11 Hi 3d slicer experts and all I have 4 RT Doses that I have exported them from Treatment Planning System(TPS). the prescribed dose for this patient is 70Gy; and the sum of these 4 doses in TPS is 70… --- ## [Export RTDOSE to DICOM](https://discourse.slicer.org/t/export-rtdose-to-dicom/12141)
**Author:** [@jannah\_fj](https://discourse.slicer.org/u/jannah_fj)\ **Replies:** 8\ **Last updated:** [February 2, 2021, 1:28pm UTC](https://discourse.slicer.org/t/export-rtdose-to-dicom/12141 "2021-02-02T13:28:03Z")
Helo there, I have trouble when I want to export RTDose to Dicom. I’ve tried to export but there is just the image or CT that exported on the output file. Meanwhile there is no RTDose. Thank you for your help. Let me E… --- ## [Convert rt structure with hole to stl](https://discourse.slicer.org/t/convert-rt-structure-with-hole-to-stl/9988)
**Author:** [@ali](https://discourse.slicer.org/u/ali)\ **Replies:** 6\ **Last updated:** [February 8, 2020, 5:58am UTC](https://discourse.slicer.org/t/convert-rt-structure-with-hole-to-stl/9988 "2020-02-08T05:58:52Z")
Hi all, I am able to convert a simple ROI (or rt sturcture) made in our treatment planning system into an STL file for 3D printing. What I want to do is convert an ROI with a hole in it into an STL file. To start out, I… --- ## [How to create RTStruct dicom ](https://discourse.slicer.org/t/how-to-create-rtstruct-dicom/7382)
**Author:** [@agatte](https://discourse.slicer.org/u/agatte)\ **Replies:** 3\ **Last updated:** [July 9, 2019, 2:04pm UTC](https://discourse.slicer.org/t/how-to-create-rtstruct-dicom/7382 "2019-07-09T14:04:06Z")
Hello, I have already created labelmap image with segmentation. I would like to export this file to RTStruct. I would like to create RTStruct image. Is this possible in Slicer ? In which module ? I would be appreciate… --- ## [SlicerRT, dose and colorbar](https://discourse.slicer.org/t/slicerrt-dose-and-colorbar/6737)
**Author:** [@PaoloZaffino](https://discourse.slicer.org/u/PaoloZaffino)\ **Replies:** 3\ **Last updated:** [May 9, 2019, 4:38pm UTC](https://discourse.slicer.org/t/slicerrt-dose-and-colorbar/6737 "2019-05-09T16:38:44Z")
Hi all, I have a CT with a dose cube and I can import and visualize them in Slicer (v.4.10). At this point would like to show also a colorbar for the dose. Do you have any suggestion? Thank you very much. Paolo --- ## [Call SlicerRT Isodose (or create isodoses) from python](https://discourse.slicer.org/t/call-slicerrt-isodose-or-create-isodoses-from-python/4506)
**Author:** [@dominicrushforth](https://discourse.slicer.org/u/dominicrushforth)\ **Replies:** 6\ **Last updated:** [November 9, 2018, 9:19am UTC](https://discourse.slicer.org/t/call-slicerrt-isodose-or-create-isodoses-from-python/4506 "2018-11-09T09:19:42Z")
I have built a widget that calculates MRT doses and the SlicerRT Isodose widget does a great job creating isolines and volumes. I would like to be able to call the Isodose process from within my python code so that the … --- ## [Conerting RTstruct file to nrrd : Getting a meaningful result with correct dimensions?](https://discourse.slicer.org/t/conerting-rtstruct-file-to-nrrd-getting-a-meaningful-result-with-correct-dimensions/3921)
**Author:** [@sdoken](https://discourse.slicer.org/u/sdoken)\ **Replies:** 1\ **Last updated:** [August 28, 2018, 2:56pm UTC](https://discourse.slicer.org/t/conerting-rtstruct-file-to-nrrd-getting-a-meaningful-result-with-correct-dimensions/3921 "2018-08-28T14:56:49Z")
Operating system: MacOS Slicer version: 4.9.0.-2018-08-04 Expected behavior: Produce nrrd file with 15x512x512x128 dimensions Actual behavior: Finding nrrd file with 15x357x211x128 dimensions Hi All, Would someone… --- ## [Slicer not loading a radiotherapy plan and dataset](https://discourse.slicer.org/t/slicer-not-loading-a-radiotherapy-plan-and-dataset/3453)
**Author:** [@Lowey](https://discourse.slicer.org/u/Lowey)\ **Replies:** 5\ **Last updated:** [July 11, 2018, 2:04am UTC](https://discourse.slicer.org/t/slicer-not-loading-a-radiotherapy-plan-and-dataset/3453 "2018-07-11T02:04:59Z")
Operating system: Windows 7 Slicer version: 4.8.1 Expected behavior: To be able to examine and load a radiotherapy dataset without errors Actual behavior: I receive the following errors when trying to ‘examine’ my dat…