# Latest

**URL:** https://discourse.canceridc.dev/latest.md

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

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## [Welcome to Discourse](https://discourse.canceridc.dev/t/welcome-to-discourse/7)

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**Author:** [@system](https://discourse.canceridc.dev/u/system)\
**Replies:** 0\
**Last updated:** [July 20, 2020, 9:46pm UTC](https://discourse.canceridc.dev/t/welcome-to-discourse/7 "2020-07-20T21:46:16Z")

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Welcome to the Imaging Data Commons forum (a.k.a. IDC Discourse)! NOTE: all of the posts published in public categories (those that don’t have a “lock” sign) will be available to anyone on the internet once IDC is relea…

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## [Dicom3tools binaries are now available via a PyPI package](https://discourse.canceridc.dev/t/dicom3tools-binaries-are-now-available-via-a-pypi-package/802)

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**Author:** [@fedorov](https://discourse.canceridc.dev/u/fedorov)\
**Replies:** 1\
**Last updated:** [September 16, 2026, 7:54pm UTC](https://discourse.canceridc.dev/t/dicom3tools-binaries-are-now-available-via-a-pypi-package/802 "2026-09-16T19:54:28Z")

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Those of us who work with DICOM a lot (by desire or by necessity) know what dciodvfy is. The ultimate DICOM validator. One of the many tools offered by the dicom3tools software maintained by the one and only David Clunie…

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## [Deprecation of legacy functionality: OHIF v2 and IDC REST API v2](https://discourse.canceridc.dev/t/deprecation-of-legacy-functionality-ohif-v2-and-idc-rest-api-v2/792)

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**Author:** [@fedorov](https://discourse.canceridc.dev/u/fedorov)\
**Replies:** 1\
**Last updated:** [August 31, 2026, 6:23pm UTC](https://discourse.canceridc.dev/t/deprecation-of-legacy-functionality-ohif-v2-and-idc-rest-api-v2/792 "2026-08-31T18:23:59Z")

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We plan to phase out the following components of IDC infrastructure by the end of this month. If you have any concerns, or would like us to reconsider this plan, please let us know by responding to this thread! OHIF v2…

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## [Aligning Segmentation and CT slices for feature extraction via Pyradiomics](https://discourse.canceridc.dev/t/aligning-segmentation-and-ct-slices-for-feature-extraction-via-pyradiomics/625)

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**Author:** [@Nav\_Malhotra](https://discourse.canceridc.dev/u/Nav_Malhotra)\
**Replies:** 4\
**Last updated:** [August 12, 2026, 1:56pm UTC](https://discourse.canceridc.dev/t/aligning-segmentation-and-ct-slices-for-feature-extraction-via-pyradiomics/625 "2026-08-12T13:56:48Z")

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Currently I am trying to extract higher order and texture based features from NLST chest CTs from their downloaded DICOM format. I was having trouble properly formatting the data for insertion into a feature extraction …

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## [Highdicom Release 0.28.0 with ITK/SimpleITK and NiBabel Interoperability and Legacy Converted Enhanced Image Conversion](https://discourse.canceridc.dev/t/highdicom-release-0-28-0-with-itk-simpleitk-and-nibabel-interoperability-and-legacy-converted-enhanced-image-conversion/794)

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**Author:** [@CPBridge](https://discourse.canceridc.dev/u/CPBridge)\
**Replies:** 0\
**Last updated:** [August 8, 2026, 4:14pm UTC](https://discourse.canceridc.dev/t/highdicom-release-0-28-0-with-itk-simpleitk-and-nibabel-interoperability-and-legacy-converted-enhanced-image-conversion/794 "2026-08-08T16:14:57Z")

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I am happy to announce that a couple of weeks ago we released a new version of our highdicom Python library, version 0.28.0 (and more recently 0.28.1) with major features that may be of interest to this community. Two …

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## [IDC AI assistant interfaces and REST API updates](https://discourse.canceridc.dev/t/idc-ai-assistant-interfaces-and-rest-api-updates/791)

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**Author:** [@fedorov](https://discourse.canceridc.dev/u/fedorov)\
**Replies:** 0\
**Last updated:** [August 4, 2026, 8:32pm UTC](https://discourse.canceridc.dev/t/idc-ai-assistant-interfaces-and-rest-api-updates/791 "2026-08-04T20:32:33Z")

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TL;DR: IDC MCP server and REST API v3 are live! Note: both are in beta - API can change as we continue testing, collecting user feedback and improving the capabilities. Please respond to this thread with any suggestions…

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## [Unable to view IDC study via a cBioPortal viewer link](https://discourse.canceridc.dev/t/unable-to-view-idc-study-via-a-cbioportal-viewer-link/784)

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**Author:** [@Andrei\_Kiselev](https://discourse.canceridc.dev/u/Andrei_Kiselev)\
**Replies:** 8\
**Last updated:** [June 5, 2026, 10:15pm UTC](https://discourse.canceridc.dev/t/unable-to-view-idc-study-via-a-cbioportal-viewer-link/784 "2026-06-05T22:15:48Z")

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Enter the description of your problem here: Image preview is not opening ============= SESSION INFO ============= == App == version 4.12.51 == Extensions Versions == generic-viewer-commands 4.12.51 cornerstone 2.1…

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## [Pathology Report Accessibility / matching data with KidsFirst portal](https://discourse.canceridc.dev/t/pathology-report-accessibility-matching-data-with-kidsfirst-portal/785)

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**Author:** [@Malone\_Therry](https://discourse.canceridc.dev/u/Malone_Therry)\
**Replies:** 8\
**Last updated:** [May 27, 2026, 1:00pm UTC](https://discourse.canceridc.dev/t/pathology-report-accessibility-matching-data-with-kidsfirst-portal/785 "2026-05-27T13:00:48Z")

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Hello, I am working on a machine learning digital pathology project with medulloblastoma WSIs and would like to use IDC data as an external test set. I’ve already downloaded the images from the IDC SM portal however I w…

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## [IDC data release v24 May 2026: New GDC projects, preclinical models, updates from TCIA](https://discourse.canceridc.dev/t/idc-data-release-v24-may-2026-new-gdc-projects-preclinical-models-updates-from-tcia/786)

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**Author:** [@fedorov](https://discourse.canceridc.dev/u/fedorov)\
**Replies:** 0\
**Last updated:** [May 14, 2026, 3:50pm UTC](https://discourse.canceridc.dev/t/idc-data-release-v24-may-2026-new-gdc-projects-preclinical-models-updates-from-tcia/786 "2026-05-14T15:50:42Z")

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NCI Imaging Data Commons (IDC) v24 is live! This is the largest data release by file count since 2022, adding 15 new collections and approximately 5.7 terabytes (TB) of new data. With this release we cross the milestone…

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## [Google HI-DEF Path Foundation model embeddings for IDC slides](https://discourse.canceridc.dev/t/google-hi-def-path-foundation-model-embeddings-for-idc-slides/783)

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**Author:** [@fedorov](https://discourse.canceridc.dev/u/fedorov)\
**Replies:** 0\
**Last updated:** [April 7, 2026, 3:18pm UTC](https://discourse.canceridc.dev/t/google-hi-def-path-foundation-model-embeddings-for-idc-slides/783 "2026-04-07T15:18:04Z")

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HI-DEF Path Foundation model embeddings extracted from 65K+ IDC slides have been released by the Google HealthAI team, and are available under permissive CC-BY license! Learn more from the blog post, and even more from …

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## [Downloading the histopathology slides](https://discourse.canceridc.dev/t/downloading-the-histopathology-slides/780)

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**Author:** [@Fahad\_Sajjad](https://discourse.canceridc.dev/u/Fahad_Sajjad)\
**Replies:** 4\
**Last updated:** [March 2, 2026, 9:38pm UTC](https://discourse.canceridc.dev/t/downloading-the-histopathology-slides/780 "2026-03-02T21:38:40Z")

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Respected support team, I hope this message finds you well. we have initiated a project related to triple negative breast cancer. We will train the Ai foundation model on the histopathology slides to predict the patien…

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## [Get started with TIAToolbox to analyze IDC pathology images](https://discourse.canceridc.dev/t/get-started-with-tiatoolbox-to-analyze-idc-pathology-images/779)

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**Author:** [@fedorov](https://discourse.canceridc.dev/u/fedorov)\
**Replies:** 0\
**Last updated:** [February 25, 2026, 6:06pm UTC](https://discourse.canceridc.dev/t/get-started-with-tiatoolbox-to-analyze-idc-pathology-images/779 "2026-02-25T18:06:25Z")

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Interested in digital pathology image analysis but not sure where to start? Check out the new set of interactive python notebook tutorials demonstrating how to use open-source TIAToolbox with the slide microscopy images …

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## [Imaging Data Commons Claude skill launched!](https://discourse.canceridc.dev/t/imaging-data-commons-claude-skill-launched/777)

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**Author:** [@fedorov](https://discourse.canceridc.dev/u/fedorov)\
**Replies:** 0\
**Last updated:** [January 29, 2026, 2:51pm UTC](https://discourse.canceridc.dev/t/imaging-data-commons-claude-skill-launched/777 "2026-01-29T14:51:44Z")

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Today is a big day for Imaging Data Commons - the initial version of the 𝗜𝗗𝗖 𝗖𝗹𝗮𝘂𝗱𝗲 𝘀𝗸𝗶𝗹𝗹 𝗶𝘀 𝗹𝗶𝘃𝗲, and I think it triggers a seismic shift in making 90+TB of data in IDC more accessible and discoverable! • 𝘍𝘪𝘯𝘥 𝘪𝘮𝘢𝘨𝘪𝘯𝘨 …

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## [Locating fractional DICOM Segmentations in IDC](https://discourse.canceridc.dev/t/locating-fractional-dicom-segmentations-in-idc/776)

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**Author:** [@fedorov](https://discourse.canceridc.dev/u/fedorov)\
**Replies:** 0\
**Last updated:** [January 26, 2026, 3:20pm UTC](https://discourse.canceridc.dev/t/locating-fractional-dicom-segmentations-in-idc/776 "2026-01-26T15:20:00Z")

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This post is in response to this question that I received from an IDC user recently: “where I can find an example of FRACTIONAL Segmentation in DICOM-SEG?” TL;DR: IDC contains 17,238 fractional segmentation series ac…

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## [Availability of lung cancer annotations](https://discourse.canceridc.dev/t/availability-of-lung-cancer-annotations/772)

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**Author:** [@deepa](https://discourse.canceridc.dev/u/deepa)\
**Replies:** 3\
**Last updated:** [January 17, 2026, 2:29am UTC](https://discourse.canceridc.dev/t/availability-of-lung-cancer-annotations/772 "2026-01-17T02:29:31Z")

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I received this message on LinkedIn with regard to the NLSTseg dataset lesion/tumor annotations. I thought it would be good to post a response here. Our group is developing machine learning models for lung cancer predi…

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## [Sampling IDC images by image orientation or inconsistent geometry](https://discourse.canceridc.dev/t/sampling-idc-images-by-image-orientation-or-inconsistent-geometry/770)

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**Author:** [@fedorov](https://discourse.canceridc.dev/u/fedorov)\
**Replies:** 5\
**Last updated:** [January 13, 2026, 10:54pm UTC](https://discourse.canceridc.dev/t/sampling-idc-images-by-image-orientation-or-inconsistent-geometry/770 "2026-01-13T22:54:54Z")

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it would be useful if you could provide a few test series with non-axial slice orientations. Have you encountered \[…\] images with variable slice spacing or non-parallel slices? TL;DR: Yes, it is relatively easy to add…

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## [Contrast CT of forearm?](https://discourse.canceridc.dev/t/contrast-ct-of-forearm/768)

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**Author:** [@dzenanz](https://discourse.canceridc.dev/u/dzenanz)\
**Replies:** 10\
**Last updated:** [January 7, 2026, 3:05pm UTC](https://discourse.canceridc.dev/t/contrast-ct-of-forearm/768 "2026-01-07T15:05:44Z")

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Are there any contrast-enhanced CT images of forearms in IDC? Or even someplace else? The closest I found is Soft-tissue-Sarcoma, namely STS\_008 and STS\_019. But they don’t have contrast, and I am aiming to segment the f…

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## [NLST Data Completeness: Missing 28 CT Cancer Patients](https://discourse.canceridc.dev/t/nlst-data-completeness-missing-28-ct-cancer-patients/765)

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**Author:** [@kosmasgal](https://discourse.canceridc.dev/u/kosmasgal)\
**Replies:** 7\
**Last updated:** [December 17, 2025, 2:52pm UTC](https://discourse.canceridc.dev/t/nlst-data-completeness-missing-28-ct-cancer-patients/765 "2025-12-17T14:52:05Z")

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Hi everyone, I am working with the NLST collection in IDC and have performed a detailed completeness check against the NLST User Guide and original publications. I am using the idc\_index package to work with the data, m…

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## [Help with the download of CCDI images while filtering by diagnosis/embedding medium](https://discourse.canceridc.dev/t/help-with-the-download-of-ccdi-images-while-filtering-by-diagnosis-embedding-medium/766)

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**Author:** [@charlie](https://discourse.canceridc.dev/u/charlie)\
**Replies:** 3\
**Last updated:** [December 15, 2025, 9:42pm UTC](https://discourse.canceridc.dev/t/help-with-the-download-of-ccdi-images-while-filtering-by-diagnosis-embedding-medium/766 "2025-12-15T21:42:05Z")

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Hello, My name is Charlie and I’m a pathology resident at University of Colorado Anschutz and am hoping to get some help with downloading whole slide images for an upcoming research project. I unfortunately have very l…

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## [IDC data release v23 - Nov 2025: new analysis results collections](https://discourse.canceridc.dev/t/idc-data-release-v23-nov-2025-new-analysis-results-collections/764)

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**Author:** [@fedorov](https://discourse.canceridc.dev/u/fedorov)\
**Replies:** 1\
**Last updated:** [November 26, 2025, 10:19pm UTC](https://discourse.canceridc.dev/t/idc-data-release-v23-nov-2025-new-analysis-results-collections/764 "2025-11-26T22:19:11Z")

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The main highlight of this new IDC data release is in new analysis results collections, complementing the existing images with both expert- and AI-generated annotations. Although the total size in terabytes is modest, th…

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## [How to Access Radiologist Observation Notes in Patient CT/MRI/Ultrasound/PET Reports?](https://discourse.canceridc.dev/t/how-to-access-radiologist-observation-notes-in-patient-ct-mri-ultrasound-pet-reports/763)

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**Author:** [@nidhi](https://discourse.canceridc.dev/u/nidhi)\
**Replies:** 1\
**Last updated:** [November 24, 2025, 3:24pm UTC](https://discourse.canceridc.dev/t/how-to-access-radiologist-observation-notes-in-patient-ct-mri-ultrasound-pet-reports/763 "2025-11-24T15:24:14Z")

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I am downloading patient reports (CT, MRI, Ultrasound, PET) from the portal, but I only receive the standard report PDF—there are no radiologist observation/interpretation notes included. Does anyone know where or how I…

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## [Direct download from the portal does not work](https://discourse.canceridc.dev/t/direct-download-from-the-portal-does-not-work/761)

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**Author:** [@Mapaul83](https://discourse.canceridc.dev/u/Mapaul83)\
**Replies:** 13\
**Last updated:** [November 1, 2025, 6:01pm UTC](https://discourse.canceridc.dev/t/direct-download-from-the-portal-does-not-work/761 "2025-11-01T18:01:25Z")

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Where can I find help in troubleshooting the direct download? I’ve tried using both Chrome and Edge browsers, but the download progress bare immediately finishes (Download complete). Folder names with correct instance ID…

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## [Direct download from IDC Portal is live](https://discourse.canceridc.dev/t/direct-download-from-idc-portal-is-live/743)

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**Author:** [@fedorov](https://discourse.canceridc.dev/u/fedorov)\
**Replies:** 1\
**Last updated:** [September 8, 2025, 1:38pm UTC](https://discourse.canceridc.dev/t/direct-download-from-idc-portal-is-live/743 "2025-09-08T13:38:07Z")

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We are happy to announce a new feature of the IDC Portal: It is finally possible to download IDC data directly from the portal - without installing any extra tools. The data will be streamed to your computer local folder…

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## [Ohif tag viewer not working](https://discourse.canceridc.dev/t/ohif-tag-viewer-not-working/755)

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**Author:** [@kirbyju](https://discourse.canceridc.dev/u/kirbyju)\
**Replies:** 2\
**Last updated:** [October 15, 2025, 8:07pm UTC](https://discourse.canceridc.dev/t/ohif-tag-viewer-not-working/755 "2025-10-15T20:07:52Z")

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The tag browser that appears in the left sidebar when you click the “…” doesn’t seem to do anything on my machine. Just me? Or a bug? The tag browser in the menu up top does work. I’m on a macbook using chrome in cas…

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## [Creating cohort in portal from a list of PatientIDs](https://discourse.canceridc.dev/t/creating-cohort-in-portal-from-a-list-of-patientids/747)

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**Author:** [@Graglia\_Luca\_BSD](https://discourse.canceridc.dev/u/Graglia_Luca_BSD)\
**Replies:** 6\
**Last updated:** [October 14, 2025, 4:57pm UTC](https://discourse.canceridc.dev/t/creating-cohort-in-portal-from-a-list-of-patientids/747 "2025-10-14T16:57:09Z")

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Hi, I have a list of PatientID and I would like to load them in the portal (https://portal.imaging.datacommons.cancer.gov/explore/ ) to create a cohort. How can I do that? Best, Luca ▶ ···

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## [IDC data release v22 - Sept 2025](https://discourse.canceridc.dev/t/idc-data-release-v22-sept-2025/753)

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**Author:** [@fedorov](https://discourse.canceridc.dev/u/fedorov)\
**Replies:** 1\
**Last updated:** [October 7, 2025, 3:07am UTC](https://discourse.canceridc.dev/t/idc-data-release-v22-sept-2025/753 "2025-10-07T03:07:18Z")

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v22 data release of IDC brings you 11 new collections and over 5TB of new freely available cancer imaging data! Data release summary is here, with the key highlights below. Overall summary of v22 Files: 46,695,167 (+91…

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## [IDC Database Access Inquiry](https://discourse.canceridc.dev/t/idc-database-access-inquiry/744)

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**Author:** [@Xiaopeng](https://discourse.canceridc.dev/u/Xiaopeng)\
**Replies:** 2\
**Last updated:** [September 9, 2025, 9:37pm UTC](https://discourse.canceridc.dev/t/idc-database-access-inquiry/744 "2025-09-09T21:37:27Z")

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I would like to inquire whether the IDC database is open to researchers from China.

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## [IDC data is now available via DICOMweb interface!](https://discourse.canceridc.dev/t/idc-data-is-now-available-via-dicomweb-interface/729)

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**Author:** [@fedorov](https://discourse.canceridc.dev/u/fedorov)\
**Replies:** 0\
**Last updated:** [July 22, 2025, 10:17pm UTC](https://discourse.canceridc.dev/t/idc-data-is-now-available-via-dicomweb-interface/729 "2025-07-22T22:17:57Z")

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We are happy to announce availability of DICOMweb interface for accessing IDC data! DICOMweb is the DICOM Standard for web-based medical imaging, providing a set of RESTful services for search and retrieval of DICOM obj…

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## [\`public-datasets-idc\` Google Storage bucket decommissioning](https://discourse.canceridc.dev/t/public-datasets-idc-google-storage-bucket-decommissioning/728)

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**Author:** [@fedorov](https://discourse.canceridc.dev/u/fedorov)\
**Replies:** 0\
**Last updated:** [July 22, 2025, 3:00pm UTC](https://discourse.canceridc.dev/t/public-datasets-idc-google-storage-bucket-decommissioning/728 "2025-07-22T15:00:30Z")

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IDC data is replicated between Google Cloud Storage (GCS) and AWS buckets, and is available for free egress from either location, with the storage bucket organization documented in this article. Up until IDC release v19…

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## [What is the difference between the three AWS buckets?](https://discourse.canceridc.dev/t/what-is-the-difference-between-the-three-aws-buckets/459)

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**Author:** [@Chris\_Hafey](https://discourse.canceridc.dev/u/Chris_Hafey)\
**Replies:** 4\
**Last updated:** [July 21, 2025, 8:15pm UTC](https://discourse.canceridc.dev/t/what-is-the-difference-between-the-three-aws-buckets/459 "2025-07-21T20:15:00Z")

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Hello - I see that there are three different buckets on AWS: arn:aws:s3:::idc-open-data (58TB) arn:aws:s3:::idc-open-data-two (235GB) arn:aws:s3:::idc-open-data-cr (haven’t checked) What is the difference between the…

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