# General

**URL:** https://discourse.orthanc-server.org/c/general/4.md

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

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## [A social experiment - Collaborative map of the Orthanc users](https://discourse.orthanc-server.org/t/a-social-experiment-collaborative-map-of-the-orthanc-users/6478)

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**Author:** [@jodogne](https://discourse.orthanc-server.org/u/jodogne)\
**Replies:** 0\
**Last updated:** [September 10, 2026, 4:47pm UTC](https://discourse.orthanc-server.org/t/a-social-experiment-collaborative-map-of-the-orthanc-users/6478 "2026-09-10T16:47:03Z")

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Dear all, We know that the Orthanc community is worldwide, with many people using the project in many different ways. Yet, we don’t know much about one another. Identifying people and organizations in the community can …

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## [Keeping Medical Imaging Open for Everyone (#donations)](https://discourse.orthanc-server.org/t/keeping-medical-imaging-open-for-everyone-donations/6316)

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**Author:** [@alainmazy](https://discourse.orthanc-server.org/u/alainmazy)\
**Replies:** 2\
**Last updated:** [November 19, 2025, 2:18pm UTC](https://discourse.orthanc-server.org/t/keeping-medical-imaging-open-for-everyone-donations/6316 "2025-11-19T14:18:15Z")

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Since 2011, Orthanc has been a trusted, open-source DICOM server for thousands of clinics, researchers, and software vendors worldwide. Today, it remains actively maintained by Sébastien Jodogne and the Orthanc Team, who…

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## [New users only accepted on invitation because of spammers](https://discourse.orthanc-server.org/t/new-users-only-accepted-on-invitation-because-of-spammers/5093)

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**Author:** [@jodogne](https://discourse.orthanc-server.org/u/jodogne)\
**Replies:** 2\
**Last updated:** [August 22, 2025, 1:08pm UTC](https://discourse.orthanc-server.org/t/new-users-only-accepted-on-invitation-because-of-spammers/5093 "2025-08-22T13:08:14Z")

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Dear Orthanc community, As you may have noticed, this discussion forum has just been targeted by spammers. The offending user accounts and associated messages have all been destroyed. As a result, I’ve been forced to di…

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## [Restriction of some features offered by our Web-based code repository](https://discourse.orthanc-server.org/t/restriction-of-some-features-offered-by-our-web-based-code-repository/5336)

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**Author:** [@jodogne](https://discourse.orthanc-server.org/u/jodogne)\
**Replies:** 0\
**Last updated:** [November 14, 2024, 9:21am UTC](https://discourse.orthanc-server.org/t/restriction-of-some-features-offered-by-our-web-based-code-repository/5336 "2024-11-14T09:21:43Z")

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Dear community, Over the last few weeks, our servers have (again) been targeted by aggressive crawlers that endanger our development process, notably by putting an extreme load on our code repository. As a result, I ha…

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## [Welcome to our community!](https://discourse.orthanc-server.org/t/welcome-to-our-community/7)

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**Author:** [@system](https://discourse.orthanc-server.org/u/system)\
**Replies:** 0\
**Last updated:** [April 10, 2023, 11:06am UTC](https://discourse.orthanc-server.org/t/welcome-to-our-community/7 "2023-04-10T11:06:30Z")

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Welcome to the discussion forum where the users of Orthanc, the open-source DICOM server, can ask their questions! Before asking a question, please read the “Asking for support” section of the Orthanc Book. In particula…

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## [About the General category](https://discourse.orthanc-server.org/t/about-the-general-category/3)

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**Author:** [@system](https://discourse.orthanc-server.org/u/system)\
**Replies:** 0

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Post your questions related to the use of Orthanc in this category.

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## [1.13.0: OrthancPluginLoadDicomInstance() reads the whole DICOM file in "EmptyPixelData" and "UntilPixelData" modes](https://discourse.orthanc-server.org/t/1-13-0-orthancpluginloaddicominstance-reads-the-whole-dicom-file-in-emptypixeldata-and-untilpixeldata-modes/6489)

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**Author:** [@a.sallai](https://discourse.orthanc-server.org/u/a.sallai)\
**Replies:** 0\
**Last updated:** [October 14, 2026, 3:07pm UTC](https://discourse.orthanc-server.org/t/1-13-0-orthancpluginloaddicominstance-reads-the-whole-dicom-file-in-emptypixeldata-and-untilpixeldata-modes/6489 "2026-10-14T15:07:26Z")

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Hi orthancteam, Disclaimer: the following summary is based on a couple of Claude sessions (Opus 5.5). These findings would have taken us many days or it would have been simply impossible with our team’s limited knowledg…

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## [Orthanc preview does not show correctly](https://discourse.orthanc-server.org/t/orthanc-preview-does-not-show-correctly/6488)

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**Author:** [@Christophe](https://discourse.orthanc-server.org/u/Christophe)\
**Replies:** 3\
**Last updated:** [October 9, 2026, 3:15pm UTC](https://discourse.orthanc-server.org/t/orthanc-preview-does-not-show-correctly/6488 "2026-10-09T15:15:38Z")

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Hi @alainmazy , I have a dicom file ( see in the attachment) 1.dcm (294.1 KB) and import it to Orthanc. When I use api /preview, the rendered image is not correct. The correct image should be Can you please he…

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## [Recommended way to migrate SQLite index → PostgreSQL with the Azure Blob storage plugin, preserving UserMetadata + labels (pgloader fails on schema mismatch)](https://discourse.orthanc-server.org/t/recommended-way-to-migrate-sqlite-index-postgresql-with-the-azure-blob-storage-plugin-preserving-usermetadata-labels-pgloader-fails-on-schema-mismatch/6485)

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**Author:** [@Sanjay\_12](https://discourse.orthanc-server.org/u/Sanjay_12)\
**Replies:** 1\
**Last updated:** [October 6, 2026, 7:34am UTC](https://discourse.orthanc-server.org/t/recommended-way-to-migrate-sqlite-index-postgresql-with-the-azure-blob-storage-plugin-preserving-usermetadata-labels-pgloader-fails-on-schema-mismatch/6485 "2026-10-06T07:34:29Z")

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Dear All, We need advice on the correct, supported way to migrate our Orthanc index from the built-in SQLite to PostgreSQL. We have already rehearsed on a staging server and solved most of the setup, but we are stuck o…

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## [Orthanc stops answering C-FIND after a few days since upgrade to Debian 13 / PostgreSQL 17 (W004 warnings)](https://discourse.orthanc-server.org/t/orthanc-stops-answering-c-find-after-a-few-days-since-upgrade-to-debian-13-postgresql-17-w004-warnings/6484)

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**Author:** [@zaynelov](https://discourse.orthanc-server.org/u/zaynelov)\
**Replies:** 1\
**Last updated:** [October 2, 2026, 7:55am UTC](https://discourse.orthanc-server.org/t/orthanc-stops-answering-c-find-after-a-few-days-since-upgrade-to-debian-13-postgresql-17-w004-warnings/6484 "2026-10-02T07:55:56Z")

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Hello, We run a fairly large Orthanc instance: ~440,000 studies, 90+ TB of DICOM storage, ~440 GB PostgreSQL index ~200 client workstations, mostly MicroDicom and RadiAnt, querying over DICOM C-FIND "LimitFindResults"…

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## [To group modalities](https://discourse.orthanc-server.org/t/to-group-modalities/6483)

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**Author:** [@Rafa](https://discourse.orthanc-server.org/u/Rafa)\
**Replies:** 6\
**Last updated:** [September 30, 2026, 4:39pm UTC](https://discourse.orthanc-server.org/t/to-group-modalities/6483 "2026-09-30T16:39:13Z")

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Hello. Is there a way to organize the remote modalities displayed in Orthanc Explorer 2 into groups? Currently, the modalities defined in DicomModalities appear in a flat alphabetical list. For example, I have three ul…

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## [\`find-worklist\` with \`LocalAet\` from Modality configuration](https://discourse.orthanc-server.org/t/find-worklist-with-localaet-from-modality-configuration/6482)

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**Author:** [@James](https://discourse.orthanc-server.org/u/James)\
**Replies:** 2\
**Last updated:** [September 25, 2026, 10:10am UTC](https://discourse.orthanc-server.org/t/find-worklist-with-localaet-from-modality-configuration/6482 "2026-09-25T10:10:19Z")

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Dear Orthanc Team, We use /modalities to dynamically create configurations for different connections. We need to customise the LocalAet that is used for that modality when using /modalities/:modalityName/find-worklist. …

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## [Lua filter to exclude DICOM of a certain ImageType value](https://discourse.orthanc-server.org/t/lua-filter-to-exclude-dicom-of-a-certain-imagetype-value/6481)

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**Author:** [@mattwrkntn](https://discourse.orthanc-server.org/u/mattwrkntn)\
**Replies:** 1\
**Last updated:** [September 25, 2026, 7:29am UTC](https://discourse.orthanc-server.org/t/lua-filter-to-exclude-dicom-of-a-certain-imagetype-value/6481 "2026-09-25T07:29:35Z")

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Hi, I am using the AdvancedStorage plugin for my Orthanc instance and I am about to add a new path to "Folders" in my config file which contains DICOM of many types and I want to specifically exclude certain DICOM that …

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## [Transfers Plugin Reduced Memory Usage Patch](https://discourse.orthanc-server.org/t/transfers-plugin-reduced-memory-usage-patch/6479)

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**Author:** [@James](https://discourse.orthanc-server.org/u/James)\
**Replies:** 1\
**Last updated:** [September 21, 2026, 1:11pm UTC](https://discourse.orthanc-server.org/t/transfers-plugin-reduced-memory-usage-patch/6479 "2026-09-21T13:11:46Z")

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Hi Orthanc team, Following the recent streaming updates to Orthanc Server, I spent some time to improve memory usage associated with the Accelerated Transfers Plugin. We’ve experienced issues using this plugin with ver…

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## [Orthanc 1.13 + docker | Several config files](https://discourse.orthanc-server.org/t/orthanc-1-13-docker-several-config-files/6476)

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**Author:** [@nil](https://discourse.orthanc-server.org/u/nil)\
**Replies:** 4\
**Last updated:** [September 18, 2026, 2:54pm UTC](https://discourse.orthanc-server.org/t/orthanc-1-13-docker-several-config-files/6476 "2026-09-18T14:54:06Z")

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I’ve been using the docker image for a while. Now that there are 2 configuration files, I’m not sure which parameters I’m supposed to give to the entrypoint. $ cat docker-entrypoint.sh #!/usr/bin/env bash set -o errexi…

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## [Issue with dicom-web calls for scans with some private tags](https://discourse.orthanc-server.org/t/issue-with-dicom-web-calls-for-scans-with-some-private-tags/6474)

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**Author:** [@adhithya](https://discourse.orthanc-server.org/u/adhithya)\
**Replies:** 4\
**Last updated:** [September 2, 2026, 7:33pm UTC](https://discourse.orthanc-server.org/t/issue-with-dicom-web-calls-for-scans-with-some-private-tags/6474 "2026-09-02T19:33:55Z")

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Greetings everyone, We just started using orthancteam/orthanc:26.8.0. We noticed that few of the scans could not be opened through the viewer. Our viewer is dicom-web based and the initial metadata call is failing for t…

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## [\[Python Plugin\] - Get origin information (CalledAet, RemoteIp)](https://discourse.orthanc-server.org/t/python-plugin-get-origin-information-calledaet-remoteip/4045)

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**Author:** [@gacou54](https://discourse.orthanc-server.org/u/gacou54)\
**Replies:** 4\
**Last updated:** [August 20, 2026, 5:03pm UTC](https://discourse.orthanc-server.org/t/python-plugin-get-origin-information-calledaet-remoteip/4045 "2026-08-20T17:03:50Z")

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Hi, I was wondering if it is possible to get the origin information (e.g. CalledAet, RemoteIp). when using the Python Plugin (I tried with orthanc.RegisterIncomingCStoreInstanceFilter()). An “equivalent” is possible in…

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## [Feature request: expose the Called AET to the incoming C-STORE instance filter](https://discourse.orthanc-server.org/t/feature-request-expose-the-called-aet-to-the-incoming-c-store-instance-filter/6471)

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**Author:** [@peoplesm](https://discourse.orthanc-server.org/u/peoplesm)\
**Replies:** 4\
**Last updated:** [August 20, 2026, 4:24pm UTC](https://discourse.orthanc-server.org/t/feature-request-expose-the-called-aet-to-the-incoming-c-store-instance-filter/6471 "2026-08-20T16:24:04Z")

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We run a multi-tenant Orthanc as a public DIMSE ingress (1.12.11, Python plugin 7.1). Each tenant is identified by a Called AE Title we issue, because our senders’ Calling AEs are vendor factory defaults (OEM\_StoreSCU, S…

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## [Orthanc python plugin that adds a GraphQL layer to reduce REST query overhead](https://discourse.orthanc-server.org/t/orthanc-python-plugin-that-adds-a-graphql-layer-to-reduce-rest-query-overhead/6472)

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**Author:** [@TReniers](https://discourse.orthanc-server.org/u/TReniers)\
**Replies:** 1\
**Last updated:** [August 15, 2026, 8:24am UTC](https://discourse.orthanc-server.org/t/orthanc-python-plugin-that-adds-a-graphql-layer-to-reduce-rest-query-overhead/6472 "2026-08-15T08:24:13Z")

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Hi Everyone, I’m happy to share that I created a new python plugin for Orthanc that extends the rest API to provide a GraphQL API. This significantly reduces the overhead of the current API, allowing one to only query t…

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## [Migrating large XA studies](https://discourse.orthanc-server.org/t/migrating-large-xa-studies/6470)

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**Author:** [@byweber](https://discourse.orthanc-server.org/u/byweber)\
**Replies:** 1\
**Last updated:** [August 13, 2026, 7:46am UTC](https://discourse.orthanc-server.org/t/migrating-large-xa-studies/6470 "2026-08-13T07:46:39Z")

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Hi everyone, I need to migrate specific Hemodynamics (XA) studies from a source Orthanc instance (HMSJ) to a destination Orthanc instance (HEMO). Context & Scope: Volume: ~450 studies Study size: Very large (~3 GB pe…

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## [Default search in OE2](https://discourse.orthanc-server.org/t/default-search-in-oe2/6421)

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**Author:** [@ddrucker](https://discourse.orthanc-server.org/u/ddrucker)\
**Replies:** 3\
**Last updated:** [August 6, 2026, 1:35pm UTC](https://discourse.orthanc-server.org/t/default-search-in-oe2/6421 "2026-08-06T13:35:45Z")

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Is there a way to have a default search in OE2? Having it empty by default is not very useful, but having it show all most-recent is slow. I’d love to be able to show today’s studies only.

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## [AdvancedStorage. StoragePath only with the year of the StudyDate](https://discourse.orthanc-server.org/t/advancedstorage-storagepath-only-with-the-year-of-the-studydate/6468)

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**Author:** [@Rafa](https://discourse.orthanc-server.org/u/Rafa)\
**Replies:** 3\
**Last updated:** [August 2, 2026, 10:18am UTC](https://discourse.orthanc-server.org/t/advancedstorage-storagepath-only-with-the-year-of-the-studydate/6468 "2026-08-02T10:18:56Z")

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Hello. I’ve been searching the forum but haven’t found any topics that can help me with this. I’m trying to use the AdvancedStorage plugin to define the storage path to one that will be easier to manage when restoring …

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## [Move files between MultipleStorages](https://discourse.orthanc-server.org/t/move-files-between-multiplestorages/6469)

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**Author:** [@daaryshev](https://discourse.orthanc-server.org/u/daaryshev)\
**Replies:** 2\
**Last updated:** [August 2, 2026, 6:29am UTC](https://discourse.orthanc-server.org/t/move-files-between-multiplestorages/6469 "2026-08-02T06:29:32Z")

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Hello community, My storage for orthanc files is getting over. I would like to move old files to another storage, I am mounting smb-share for that. I created api-key via keycloak web-interface for rest-api requests, It…

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## [MRI Alignment Issue in OHIF: Direct DICOM Send vs Manual Upload from Scanner](https://discourse.orthanc-server.org/t/mri-alignment-issue-in-ohif-direct-dicom-send-vs-manual-upload-from-scanner/6466)

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**Author:** [@Akash123](https://discourse.orthanc-server.org/u/Akash123)\
**Replies:** 2\
**Last updated:** [July 29, 2026, 6:09pm UTC](https://discourse.orthanc-server.org/t/mri-alignment-issue-in-ohif-direct-dicom-send-vs-manual-upload-from-scanner/6466 "2026-07-29T18:09:33Z")

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Hi everyone, I am facing a strange issue with Orthanc and OHIF and would appreciate any guidance. My setup MRI Scanner → Local Orthanc (installed at the client site) Local Orthanc routes studies to our cloud Ortha…

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## [Ultrasound Studies Open Very Slowly in OHIF Viewer via Orthanc DICOMweb](https://discourse.orthanc-server.org/t/ultrasound-studies-open-very-slowly-in-ohif-viewer-via-orthanc-dicomweb/6464)

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**Author:** [@jemitsanghvi](https://discourse.orthanc-server.org/u/jemitsanghvi)\
**Replies:** 3\
**Last updated:** [July 24, 2026, 4:24am UTC](https://discourse.orthanc-server.org/t/ultrasound-studies-open-very-slowly-in-ohif-viewer-via-orthanc-dicomweb/6464 "2026-07-24T04:24:55Z")

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Hello Orthanc Team, We are experiencing a performance issue when opening Ultrasound studies through OHIF Viewer connected to Orthanc via DICOMweb. Issue: Ultrasound studies take a considerable amount of time to open i…

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## [OPV Dicom files from Zeiss HFA II](https://discourse.orthanc-server.org/t/opv-dicom-files-from-zeiss-hfa-ii/6394)

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**Author:** [@Rob](https://discourse.orthanc-server.org/u/Rob)\
**Replies:** 5\
**Last updated:** [July 22, 2026, 8:01am UTC](https://discourse.orthanc-server.org/t/opv-dicom-files-from-zeiss-hfa-ii/6394 "2026-07-22T08:01:04Z")

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Hello community, I am new to Dicom and Orthanc. We have a Zeiss HFA 745 in our practice and I am looking for a way to transfer the data to an Orthanc server. I have configured the interface on the device and on the serv…

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## [Stone Web Cache Query](https://discourse.orthanc-server.org/t/stone-web-cache-query/6465)

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**Author:** [@davie](https://discourse.orthanc-server.org/u/davie)\
**Replies:** 0\
**Last updated:** [July 13, 2026, 1:33pm UTC](https://discourse.orthanc-server.org/t/stone-web-cache-query/6465 "2026-07-13T13:33:24Z")

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Hello, Thank you again for all the work on Orthanc. I had a query about this configuration: /\*\* \* Set the size of the cache that stores the DICOM files. This \* size is expressed in megabytes. The default value of 12…

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## [Issues with single frame multiframes](https://discourse.orthanc-server.org/t/issues-with-single-frame-multiframes/6422)

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**Author:** [@davie](https://discourse.orthanc-server.org/u/davie)\
**Replies:** 2\
**Last updated:** [July 10, 2026, 10:10am UTC](https://discourse.orthanc-server.org/t/issues-with-single-frame-multiframes/6422 "2026-07-10T10:10:55Z")

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Hi, We are seeing a couple of issues trying to view single frame multiframes from Philips MRI scanners: Trying to preview the instance from Orthanc Explorer gives me an HTTP 415 In Stone Web Viewer, the instance appea…

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## [Osirix MD/Horos document extractor plugin](https://discourse.orthanc-server.org/t/osirix-md-horos-document-extractor-plugin/6463)

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**Author:** [@boskar](https://discourse.orthanc-server.org/u/boskar)\
**Replies:** 0\
**Last updated:** [July 4, 2026, 7:22pm UTC](https://discourse.orthanc-server.org/t/osirix-md-horos-document-extractor-plugin/6463 "2026-07-04T19:22:12Z")

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Hello, I’ve just created another python for Orthanc. This time it serves reports generated, stored and sent by Osirix MD/Horos. Natively the reports generated by MacOS compatibile text editor (i.e. Pages, LibreOffice,…

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## [Database errors when querying a tenant](https://discourse.orthanc-server.org/t/database-errors-when-querying-a-tenant/6461)

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**Author:** [@johnburian](https://discourse.orthanc-server.org/u/johnburian)\
**Replies:** 3\
**Last updated:** [July 3, 2026, 6:42am UTC](https://discourse.orthanc-server.org/t/database-errors-when-querying-a-tenant/6461 "2026-07-03T06:42:16Z")

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We have a Orthanc server configured as multi-tenant: “DicomAet” : “RF-TEST”, “DicomPort” : 4242, “MultitenantDicom” : { “Servers” : \[ { “AET” : “RF-LIMIT”, “Port” : 4343, “Labels” : \[ “limit” \]…

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