XNAT

XNAT manages neuroimaging and related datasets to support storage, validation, quality assurance, and quantitative analysis for imaging-based research.

Key Features:

• Three-tiered architecture: Implements a three-tiered architecture comprising a data archive, middleware engine, and a presentation layer to separate storage, processing, and access functions.
• Data entry and validation: Supports XML-based data import and data entry forms with newly added data placed in a virtual quarantine until validated by an authorized user.
• Version control and tracking: Maintains a comprehensive change history that tracks edits and provenance of managed data.
• Quality-control, search, reporting, and workflow tools: Provides data-type-specific and cross-data-type searches, detailed reports and listings of experimental data, upload/download functionality, standard laboratory workflow integration, and administration and security management tools.
• Neuroimaging format support and display generation: Supports common neuroimaging file formats including DICOM and Analyze and permits extension to additional formats and custom display generation.

Scientific Applications:

• Imaging data management and quality assurance: Facilitates centralized storage, validation, versioning, and quality-control workflows for neuroimaging and related experimental datasets.
• Cross-dataset integration and search: Enables exploration of relationships across diverse data types via data-type-specific and cross-data-type searches and detailed reporting.
• Longitudinal MRI studies and quantitative analysis (OASIS example): Has been used to manage longitudinal MRI datasets (Open Access Series of Imaging Studies) for subjects aged 60–96 including nondemented individuals and those with Alzheimer’s disease characterized by the Clinical Dementia Rating (CDR), supporting automated analyses such as whole-brain volume calculations to study normal aging and Alzheimer’s disease progression.

Methodology:

XML-based data import and form-based entry, virtual quarantine and authorized validation, change-history/version tracking, data-type-specific and cross-data-type searches, reporting and listings, upload/download operations, support for DICOM and Analyze with extensible format/display generation, and automated computational analyses including whole-brain volume calculations.