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# Frequently asked questions
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# Frequently Asked Questions
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## What is the difference between IDC and TCIA?
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The mission of IDC is to support efficient access and use of the cancer imaging data, after it was de-identified and released. Some of the highlights that make IDC unique are the following:
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* while all of the public TCIA DICOM collections are available in IDC, there is a growing amount of data in IDC that is not available anywhere else:
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***Unique datasets:**while all of the public TCIA DICOM collections are available in IDC, there is a growing amount of data in IDC that is not available anywhere else:
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* DICOM digital pathology collections from prominent initiatives: Childhood Cancer Data Initiative (CCDI), GTEx, TCGA, CPTAC, HTAN, CMB
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* image analysis results available only from IDC, such as TotalSegmentator segmentations and radiomics features for most of the CT images in the NLST collection
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* IDC makes the data available in public cloud buckets, the egress is free (TCIA provides download from on-premises servers at a single institution): chances are your will be able to download data from IDC much faster than from TCIA
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* IDC maintains superior community recognized tools to support the use of the data: 
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***Cloud-native:**IDC makes the data available in public cloud buckets, the egress is free (TCIA provides download from on-premises servers at a single institution): chances are your will be able to download data from IDC much faster than from TCIA
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***State of the art tools:**IDC maintains superior community recognized tools to support the use of the data: 
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* modern OHIF Viewer v3 for radiology data, with support of visualization of annotations and segmentations; 
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* Slim viewer for digital pathology and annotations
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* highly capable IDC Portal
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* IDC offers standard interfaces for data access: S3 API for file download, DICOMweb for interoperability with DICOM tools, SQL for searching all of the DICOM metadata (TCIA offers various non-standard, in-house interfaces and APIs for data access)
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* All of the data (radiology and digital pathology images, annotations, segmentations, image-derived features) available in IDC is harmonized into DICOM representation, which means 
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***Standard access interfaces:**IDC offers standard interfaces for data access: S3 API for file download, DICOMweb for interoperability with DICOM tools, SQL for searching all of the DICOM metadata (TCIA offers various non-standard, in-house interfaces and APIs for data access)
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***Harmonized data:**All of the data (radiology and digital pathology images, annotations, segmentations, image-derived features) available in IDC is harmonized into DICOM representation, which means 
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* interoperability: you can use IDC data with any DICOM-compatible tool
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* metadata: every single file in IDC is accompanied by metadata that follows DICOM data model, and is associated with unique identifiers, allowing you to build reproducible cohorts
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* uniform representation: you don't need to customize your processing pipelines to a specific collection, and can build cohorts combining data across collections
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* IDC data is easier to access from cloud computing resources, allowing you to more easily experiment with the new analysis tools and scale your computation
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* IDC data is versioned: you will be able to access the exact files you analyzed in a given verison of IDC even if there were any updates to the collection after you accessed it, helping you achieve reproducibility of your analyses
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***Co-location with cloud compute resources:**IDC data is easier to access from cloud computing resources, allowing you to more easily experiment with the new analysis tools and scale your computation
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***Versioning:**IDC data is versioned: you will be able to access the exact files you analyzed in a given verison of IDC even if there were any updates to the collection after you accessed it, helping you achieve reproducibility of your analyses
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