DICOM Viewer

Purpose & User Intent: This tool enables in-browser viewing of DICOM medical images for clinicians, students, and researchers who need quick access without installing dedicated software. It supports loading single-frame and multi-frame studies, basic image adjustments, and exporting snapshots for clinical review or education. Use cases include remote consultations, rapid case reviews on workstations with limited software, and educational scenarios where local data privacy is important. Core Logic & Features: The engine decodes DICOM pixel data in the browser, applies rescale slope/intercept, and maps values to a display range using window center and width. It handles single-frame and multi-frame series, diverse photometric interpretations, and provides client-side rendering with local processing. Required features include file upload, frame navigation, rendering, and PNG/JPEG exports. Advanced options may include region-of-interest exports and auto windowing. Outputs are image files and on-screen renders with no server processing by default. Inputs & Outputs: Inputs: DICOM files (or a ZIP) provided by the user. Outputs: rendered frames, display values, and exports (PNG/JPEG) of selected frames. Validation checks for DICOM signature, transfer syntax support, and consistent frame counts. Algorithms & Calculations: Pixel data decoding follows DICOM transfer syntaxes (explicit/implicit VR, little/big endian). Display values are computed as DisplayValue = slope * PixelValue + intercept; then WindowCenter/WindowWidth map to 0–255 for display. Handles multi-frame sequencing and photometric interpretations. Error & Edge Cases: Missing or corrupted files trigger specific error codes and non-intrusive messages. Unsupported transfer syntaxes or very large datasets may degrade performance. Private tags or incomplete metadata can limit display accuracy. Industry/Region & Localization: Aligned with DICOM standards (PS3.3, PS3.10). Supports unit conventions like HU for CT and millimeter spacing when provided. Local in-browser processing preserves privacy by default. Assumptions & Exclusions: Assumes inputs conform to DICOM standards and are accessible in the browser. Not a PACS gateway, not a full radiology workstation, and does not perform 3D reconstructions.