# \#slicerrt

**URL:** https://discourse.slicer.org/tag/slicerrt/30.md

[Latest](https://discourse.slicer.org/latest.md) · [Categories](https://discourse.slicer.org/categories.md) · [Tags](https://discourse.slicer.org/tags.md)

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## [How to build plastimatch binary as part of SlicerRT extension?](https://discourse.slicer.org/t/how-to-build-plastimatch-binary-as-part-of-slicerrt-extension/42025)

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**Author:** [@fedorov](https://discourse.slicer.org/u/fedorov)\
**Replies:** 5\
**Last updated:** [August 7, 2026, 9:14pm UTC](https://discourse.slicer.org/t/how-to-build-plastimatch-binary-as-part-of-slicerrt-extension/42025 "2026-08-07T21:14:40Z")

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I understand Plastimatch library is a dependency of SlicerRT, and I would like to build the command-line plastimatch binary as part of the superbuild. Is this possible? I can’t figure out how to enable it via cmake… I th…

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## [Is there a Python API to get MLC/Jaw position sequences from a VMAT plan?](https://discourse.slicer.org/t/is-there-a-python-api-to-get-mlc-jaw-position-sequences-from-a-vmat-plan/47323)

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**Author:** [@Aki](https://discourse.slicer.org/u/Aki)\
**Replies:** 2\
**Last updated:** [June 16, 2026, 11:16pm UTC](https://discourse.slicer.org/t/is-there-a-python-api-to-get-mlc-jaw-position-sequences-from-a-vmat-plan/47323 "2026-06-16T23:16:47Z")

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Hi, there I would like to get MLC/Jaw position sequences and dose/MU data at each control point from data imported into 3DSlicer. Is there any API to access such data. I would like to make a python script or extension t…

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## [SlicerRT isocenter configuration](https://discourse.slicer.org/t/slicerrt-isocenter-configuration/45122)

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**Author:** [@Mafer\_Calix](https://discourse.slicer.org/u/Mafer_Calix)\
**Replies:** 1\
**Last updated:** [December 9, 2025, 12:19pm UTC](https://discourse.slicer.org/t/slicerrt-isocenter-configuration/45122 "2025-12-09T12:19:28Z")

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Hello. I need to know whether the isocenter for the slicerRT is fixed at 100 cm. Sure, in the software I can edit the isocenter position within the body and the SDD. But I need to know if the beam’s field defined in beam…

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## [Generate DRRs from a 3DCT. Distance paramters in Python](https://discourse.slicer.org/t/generate-drrs-from-a-3dct-distance-paramters-in-python/44868)

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**Author:** [@ruju](https://discourse.slicer.org/u/ruju)\
**Replies:** 2\
**Last updated:** [October 25, 2025, 2:00pm UTC](https://discourse.slicer.org/t/generate-drrs-from-a-3dct-distance-paramters-in-python/44868 "2025-10-25T14:00:34Z")

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Hi, I have another question about the computation of DRRs in 3D slicer. In the GUI of the DRR Image Computation module I can change the isocenter to imager distance. Is it also possible to modify this parameter in a Pyt…

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## [Generate digitally reconstructed radiograph from an 3DCT. How to choose different controllpoints of an arc beam?](https://discourse.slicer.org/t/generate-digitally-reconstructed-radiograph-from-an-3dct-how-to-choose-different-controllpoints-of-an-arc-beam/44798)

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**Author:** [@ruju](https://discourse.slicer.org/u/ruju)\
**Replies:** 6\
**Last updated:** [October 22, 2025, 1:07pm UTC](https://discourse.slicer.org/t/generate-digitally-reconstructed-radiograph-from-an-3dct-how-to-choose-different-controllpoints-of-an-arc-beam/44798 "2025-10-22T13:07:06Z")

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Hello, I would like to create some DRRs from a 3DCT. I have one arc beam with some different controllpoints. If I want to generate a DRR with DDR Image Computation of this beam, it only generates a DRR for the first bea…

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## [SlicerRT not visible in modules after installation](https://discourse.slicer.org/t/slicerrt-not-visible-in-modules-after-installation/44185)

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**Author:** [@Mahrukh\_Tariq](https://discourse.slicer.org/u/Mahrukh_Tariq)\
**Replies:** 11\
**Last updated:** [September 1, 2025, 3:25pm UTC](https://discourse.slicer.org/t/slicerrt-not-visible-in-modules-after-installation/44185 "2025-09-01T15:25:10Z")

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Hi. Can you please help to resolve the issue I‘m facing with SlicerRT extension not being visible in the Modules even after it has been installed and visible in Extensions Manager. 3D Slicer version 5.8.1

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## [Repeated Segment Comparison Metric Calculations](https://discourse.slicer.org/t/repeated-segment-comparison-metric-calculations/43648)

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**Author:** [@vmcjmk](https://discourse.slicer.org/u/vmcjmk)\
**Replies:** 0\
**Last updated:** [July 8, 2025, 12:46pm UTC](https://discourse.slicer.org/t/repeated-segment-comparison-metric-calculations/43648 "2025-07-08T12:46:01Z")

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Hi there, I’m very new to 3D Slicer and was wondering about going through multiple pairs of segments in the segment comparison module. For each patient I have, I have one “reference segment” for each cancer nodule as a …

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## [Difference between the dimensions of the CT and RT dose](https://discourse.slicer.org/t/difference-between-the-dimensions-of-the-ct-and-rt-dose/38386)

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**Author:** [@azam](https://discourse.slicer.org/u/azam)\
**Replies:** 3\
**Last updated:** [July 6, 2025, 11:30am UTC](https://discourse.slicer.org/t/difference-between-the-dimensions-of-the-ct-and-rt-dose/38386 "2025-07-06T11:30:11Z")

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Hi everyone I have CT, RT dose and RT structure files that I have exported from the treatment planning system. As you can see in the figure, the dimensions of the CT image and RT dose are different. How do these two fil…

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## [Convert relative 3ddose to absolute dose in 3DSlicer](https://discourse.slicer.org/t/convert-relative-3ddose-to-absolute-dose-in-3dslicer/42852)

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**Author:** [@TaHamI](https://discourse.slicer.org/u/TaHamI)\
**Replies:** 1\
**Last updated:** [May 12, 2025, 1:56pm UTC](https://discourse.slicer.org/t/convert-relative-3ddose-to-absolute-dose-in-3dslicer/42852 "2025-05-12T13:56:13Z")

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Hello, I know, DOSXYZnrc like other monte-carlo simulations reports relative (normalized) dose (averaging on the number of histories, the number of histories just relates to dose uncertainty, no change the dose value). …

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## [DRR generation from Projection matrix](https://discourse.slicer.org/t/drr-generation-from-projection-matrix/42243)

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**Author:** [@DARSHAN\_K\_N](https://discourse.slicer.org/u/DARSHAN_K_N)\
**Replies:** 0\
**Last updated:** [March 21, 2025, 2:36am UTC](https://discourse.slicer.org/t/drr-generation-from-projection-matrix/42243 "2025-03-21T02:36:29Z")

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Is it possible to generate the DRR by using the C-arm projection matrix in Plastimatch drr if it possible tell me how to use this projection matrix in DRR generation -4389.749385 702.196627 419.994726 758491.354247 -8…

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## [Viewing DICOM RT Structure sets created in Slicer](https://discourse.slicer.org/t/viewing-dicom-rt-structure-sets-created-in-slicer/41649)

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**Author:** [@evieyeo](https://discourse.slicer.org/u/evieyeo)\
**Replies:** 1\
**Last updated:** [February 12, 2025, 2:55pm UTC](https://discourse.slicer.org/t/viewing-dicom-rt-structure-sets-created-in-slicer/41649 "2025-02-12T14:55:20Z")

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Hi Slicer friends, I am having issues working with DICOM RT Structure sets that I have created in Slicer. I am able to open them fine in Slicer, however when I use an online dicom viewer such as https://dicomviewer.net/ …

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## [Build Slicer with SlicerRT](https://discourse.slicer.org/t/build-slicer-with-slicerrt/41445)

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**Author:** [@SSDad](https://discourse.slicer.org/u/SSDad)\
**Replies:** 5\
**Last updated:** [February 5, 2025, 11:45am UTC](https://discourse.slicer.org/t/build-slicer-with-slicerrt/41445 "2025-02-05T11:45:36Z")

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I am trying to follow this website to add SlicerRT Extension to Slicer I have a couple questions here. What does the following sentence mean? " \* When configuring the project set the Slicer\_DIR to the Slicer versio…

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## [Different SlicerRT behavior when changing Windows to Linux system](https://discourse.slicer.org/t/different-slicerrt-behavior-when-changing-windows-to-linux-system/41016)

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**Author:** [@Fabio\_Lunelli](https://discourse.slicer.org/u/Fabio_Lunelli)\
**Replies:** 8\
**Last updated:** [January 16, 2025, 12:29pm UTC](https://discourse.slicer.org/t/different-slicerrt-behavior-when-changing-windows-to-linux-system/41016 "2025-01-16T12:29:10Z")

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Hi there, I am using 3D Slicer with the SlicerRT extension to simulate radiotherapy (RT) planning. My workflow involves importing two folders into Slicer: One containing the DICOM images. One containing the contoured …

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## [Handling Missing Slice Data in RT Structures: How Does SlicerRT Interpolate Missing RT Data?](https://discourse.slicer.org/t/handling-missing-slice-data-in-rt-structures-how-does-slicerrt-interpolate-missing-rt-data/40431)

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**Author:** [@tamerWagih](https://discourse.slicer.org/u/tamerWagih)\
**Replies:** 2\
**Last updated:** [November 29, 2024, 12:38pm UTC](https://discourse.slicer.org/t/handling-missing-slice-data-in-rt-structures-how-does-slicerrt-interpolate-missing-rt-data/40431 "2024-11-29T12:38:24Z")

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Hello Slicer Community, I’m currently working with RT structure sets (RTSS), and I’ve encountered an interesting issue when using Plastimatch’s convert command to extract RT structures as label images. The issue is that…

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## [Units of Beam Properties in SlicerRT extension](https://discourse.slicer.org/t/units-of-beam-properties-in-slicerrt-extension/39493)

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**Author:** [@SCJohnson](https://discourse.slicer.org/u/SCJohnson)\
**Replies:** 1\
**Last updated:** [October 3, 2024, 8:56am UTC](https://discourse.slicer.org/t/units-of-beam-properties-in-slicerrt-extension/39493 "2024-10-03T08:56:29Z")

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Good day. I would like to ask what is the unit of the Beams weight in RT slicer for proton therapy? I extracted data from the plan but the units for weight was not specified. Thank you.

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## [Extracting dose to target volume and organs at risk from MR images](https://discourse.slicer.org/t/extracting-dose-to-target-volume-and-organs-at-risk-from-mr-images/38391)

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**Author:** [@Olubunmi\_Aregbe](https://discourse.slicer.org/u/Olubunmi_Aregbe)\
**Replies:** 0\
**Last updated:** [September 15, 2024, 11:24am UTC](https://discourse.slicer.org/t/extracting-dose-to-target-volume-and-organs-at-risk-from-mr-images/38391 "2024-09-15T11:24:24Z")

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How can I extract information such as “Dose to target volume (HRCTV), dose to organs at risk (bladder, rectum and sigmoid)” from uploaded MR images that were already segmented and used for patient treatment.

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## [How to set Closed Surface representation as default segmentation for RTSTRUCT?](https://discourse.slicer.org/t/how-to-set-closed-surface-representation-as-default-segmentation-for-rtstruct/38301)

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**Author:** [@achiravu](https://discourse.slicer.org/u/achiravu)\
**Replies:** 1\
**Last updated:** [September 10, 2024, 3:38am UTC](https://discourse.slicer.org/t/how-to-set-closed-surface-representation-as-default-segmentation-for-rtstruct/38301 "2024-09-10T03:38:53Z")

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I am using the SlicerRT extension to view RTSTRUCT contours in 3D Slicer, and I’m finding the Closed Surface representation to be more useful than Planar Contour. How do I set Closed Surface as the default representation…

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## [Some SlicerRT tutorial links not working](https://discourse.slicer.org/t/some-slicerrt-tutorial-links-not-working/37979)

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**Author:** [@achiravu](https://discourse.slicer.org/u/achiravu)\
**Replies:** 1\
**Last updated:** [August 21, 2024, 3:35pm UTC](https://discourse.slicer.org/t/some-slicerrt-tutorial-links-not-working/37979 "2024-08-21T15:35:45Z")

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I am very new to 3D Slicer and want to learn a little more about Slicer RT. I have been trying to work through this tutorial: SlicerRtDoc/tutorials/SlicerRT\_Tutorial\_IGRT\_4.11.pptx at master · SlicerRt/SlicerRtDoc · GitH…

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## [Usage of Ctcreate (DOSXYZnrc) on 3D slicer](https://discourse.slicer.org/t/usage-of-ctcreate-dosxyznrc-on-3d-slicer/37649)

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**Author:** [@yassir\_elghazi](https://discourse.slicer.org/u/yassir_elghazi)\
**Replies:** 1\
**Last updated:** [August 2, 2024, 1:12pm UTC](https://discourse.slicer.org/t/usage-of-ctcreate-dosxyznrc-on-3d-slicer/37649 "2024-08-02T13:12:17Z")

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Hello Scientists, I have just imported the DICOM Folder of a patient, where it contains the DICOM images and RT structures and also doses distribution. it is a complet study exported from TPS. when i import it to the 3D…

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## [Export DICOM registration without anonymizing series](https://discourse.slicer.org/t/export-dicom-registration-without-anonymizing-series/37291)

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**Author:** [@dgriner](https://discourse.slicer.org/u/dgriner)\
**Replies:** 3\
**Last updated:** [July 11, 2024, 10:30am UTC](https://discourse.slicer.org/t/export-dicom-registration-without-anonymizing-series/37291 "2024-07-11T10:30:22Z")

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Maybe this is a naive question, but I cannot figure out this problem. I have two CT series that I have segmentations from totalsegmentator that I want to export as rtstructs using RTSlicer. I also perform registration …

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## [How to load .3ddose file with SlicerRT extensions](https://discourse.slicer.org/t/how-to-load-3ddose-file-with-slicerrt-extensions/36621)

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**Author:** [@JamsNeroc](https://discourse.slicer.org/u/JamsNeroc)\
**Replies:** 4\
**Last updated:** [June 11, 2024, 12:34am UTC](https://discourse.slicer.org/t/how-to-load-3ddose-file-with-slicerrt-extensions/36621 "2024-06-11T00:34:16Z")

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Hello everyone.  It could be found that many topics had successfully load 3ddose file with SlicerRT extensions, and @cpinter had also mentioned that “after you install the SlicerRT extension from the Extension Manager…

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## [How to install SlicerRT in the latest version of Slicer3D](https://discourse.slicer.org/t/how-to-install-slicerrt-in-the-latest-version-of-slicer3d/36391)

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**Author:** [@sarinb](https://discourse.slicer.org/u/sarinb)\
**Replies:** 0\
**Last updated:** [May 25, 2024, 2:48pm UTC](https://discourse.slicer.org/t/how-to-install-slicerrt-in-the-latest-version-of-slicer3d/36391 "2024-05-25T14:48:39Z")

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SlicerRT is not available in the Slicer3D extension manager

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## [Hausdorff Distance Interval](https://discourse.slicer.org/t/hausdorff-distance-interval/35998)

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**Author:** [@Jessica\_de\_Kort](https://discourse.slicer.org/u/Jessica_de_Kort)\
**Replies:** 4\
**Last updated:** [May 8, 2024, 4:39pm UTC](https://discourse.slicer.org/t/hausdorff-distance-interval/35998 "2024-05-08T16:39:47Z")

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I am trying to find the Hausdorff distances in the Segment Comparison module between two catheters but I don’t know what the interval is for the Hausdorff metric. I want to adjust the interval to be at 1mm and 5mm. How d…

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## [Hausdorff distance at each slice and changing intervals](https://discourse.slicer.org/t/hausdorff-distance-at-each-slice-and-changing-intervals/36000)

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**Author:** [@Jessica\_de\_Kort](https://discourse.slicer.org/u/Jessica_de_Kort)\
**Replies:** 0\
**Last updated:** [May 8, 2024, 4:48pm UTC](https://discourse.slicer.org/t/hausdorff-distance-at-each-slice-and-changing-intervals/36000 "2024-05-08T16:48:50Z")

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I am trying to find the Hausdorff distances in the Segment Comparison module between two catheters but I don’t know what the interval is for the Hausdorff metric. I want to adjust the interval to be at 1mm and 5mm. How d…

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## [Error when Performing Registration in Slicelets \> Gel Dosimetry Analysis](https://discourse.slicer.org/t/error-when-performing-registration-in-slicelets-gel-dosimetry-analysis/35478)

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**Author:** [@sieunmiin96](https://discourse.slicer.org/u/sieunmiin96)\
**Replies:** 1\
**Last updated:** [April 30, 2024, 12:10pm UTC](https://discourse.slicer.org/t/error-when-performing-registration-in-slicelets-gel-dosimetry-analysis/35478 "2024-04-30T12:10:59Z")

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I’m trying to perform gamma analysis of my data, but every time I press perform registration in 2.1 Register planning CT to CBCT of Gel Dosimetry Analysis under Slicelet, nothing happens and the loading icon by the mouse…

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## [Trouble loading vff file](https://discourse.slicer.org/t/trouble-loading-vff-file/35608)

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**Author:** [@sieunmiin96](https://discourse.slicer.org/u/sieunmiin96)\
**Replies:** 4\
**Last updated:** [April 29, 2024, 5:39pm UTC](https://discourse.slicer.org/t/trouble-loading-vff-file/35608 "2024-04-29T17:39:40Z")

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When I try to import my vff file into 3D slicer, I get the following error message: LoadVffFile: The values for the origin must each be greater than or equal to 0. LoadVffFile: Incorrect parameters or required paramete…

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## [Cannot load RTSTRUCT file](https://discourse.slicer.org/t/cannot-load-rtstruct-file/35593)

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**Author:** [@Freja](https://discourse.slicer.org/u/Freja)\
**Replies:** 3\
**Last updated:** [April 19, 2024, 9:45am UTC](https://discourse.slicer.org/t/cannot-load-rtstruct-file/35593 "2024-04-19T09:45:31Z")

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Operating system: MacOS Slicer version: 5.6.2 Hello I have a problem with loading RTSTRUCT files (RS.dcm) in 3Dslicer. The data is imported without any error massages, and I can see the files in the “DICOM database” w…

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## [A problem about the feature extraction of 3D dose distribution](https://discourse.slicer.org/t/a-problem-about-the-feature-extraction-of-3d-dose-distribution/34824)

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**Author:** [@fanfan](https://discourse.slicer.org/u/fanfan)\
**Replies:** 0\
**Last updated:** [March 11, 2024, 2:24pm UTC](https://discourse.slicer.org/t/a-problem-about-the-feature-extraction-of-3d-dose-distribution/34824 "2024-03-11T14:24:21Z")

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Hi teachers,as a novice, I already know that medical images can be extracted with image features by 3Dslicer ,but I want to use 3D slicer to extract dose data features from 3D radiotherapy dose images. Is it possible? Th…

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## [The ROI doesn't work in Film Dosimetry](https://discourse.slicer.org/t/the-roi-doesnt-work-in-film-dosimetry/34669)

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**Author:** [@Erfan\_Mollai](https://discourse.slicer.org/u/Erfan_Mollai)\
**Replies:** 1\
**Last updated:** [March 4, 2024, 1:11pm UTC](https://discourse.slicer.org/t/the-roi-doesnt-work-in-film-dosimetry/34669 "2024-03-04T13:11:50Z")

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The ROI key in “perform calibration” in dosimetry analysis didn’t work :frowning: what should i do please help me

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## [Brachytherapy treatment planning](https://discourse.slicer.org/t/brachytherapy-treatment-planning/28652)

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**Author:** [@ferhue](https://discourse.slicer.org/u/ferhue)\
**Replies:** 0\
**Last updated:** [March 29, 2023, 12:44pm UTC](https://discourse.slicer.org/t/brachytherapy-treatment-planning/28652 "2023-03-29T12:44:48Z")

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For teaching / academic / research purposes, it would be quite nice to have a basic treatment planning system for brachytherapy seeds. Note: I am cross-posting this from Create Brachy treatment planning module · Issue #…

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