June 2026: Delivered the Screenshot Review Tool with Cornerstone 3D v5.0 compatibility for OHIF/Viewers, and hardened the test suite to validate rendering and viewport behavior under the new 3D renderer. Updated test assets and scripts, and introduced stability improvements to ensure reliable QA signals during the 3D v5 migration.

Month: 2026-04 Overview: Across cornerstonejs/cornerstone3D and OHIF/Viewers, delivered user-centric features, stability improvements, and security hygiene with a focus on business value and developer productivity. Key outcomes include improved measurement accuracy, more responsive crosshair interactions, safer handling of authentication data, and enhanced accessibility and multi-frame workflows. Key features delivered: - Cornerstone3D: Text Box Positioning Accuracy Bug Fix — enhanced getTextBoxCoordsCanvas to consider all annotation points for default textbox position and corner determination (commit 11bfc2bb90571bd672c8627f812cc0118658be97). - Cornerstone3D: Crosshair Tool Enhancements — added minimal mode, jump-on-click with modifier key; refactored CrosshairsTool for performance and usability (commit df672f11cba9284035bc32dd80f697db6df3518f). - Cornerstone3D: Security: Ignore auth.json to Prevent Sensitive Data Leakage — added auth.json to .gitignore (commit 7a5cc93765b7ebfdfd02790d4eb9e7c29cd7b38b). - OHIF/Viewers: Sensitive Authentication Information Exclusion — ignore auth.json in Git to prevent accidental tracking (commit 961eea1c39c37a940c1707c3dfafcede5f4af994). - OHIF/Viewers: CinePlayer UX and Stability Enhancements — multiframe handling improvements, ensure local file frame imageIds resolve correctly, improved instance validation for undefined instances, broaden App prop types, and refactor CinePlayer for improved accessibility (commit f5a66b9eea236cd3291eac857208d7465516c89a). Major bugs fixed: - Text Box Positioning Accuracy Bug Fix (Cornerstone3D) — improved accuracy by using all annotation points for default textbox position and corner determination (commit 11bfc2bb90571bd672c8627f812cc0118658be97). - Security: Ignore auth.json to Prevent Sensitive Data Leakage — added to gitignore (Cornerstone3D) (commit 7a5cc93765b7ebfdfd02790d4eb9e7c29cd7b38b). - Sensitive Authentication Information Exclusion — ignore auth.json in Git (OHIF/Viewers) (commit 961eea1c39c37a940c1707c3dfafcede5f4af994). Overall impact and accomplishments: - Reduced risk of sensitive data leakage across repos while delivering tangible UI and reliability improvements. - Enhanced measurement accuracy and crosshair UX, boosting usability in diagnosis and imaging workflows. - Strengthened multi-frame workflows and accessibility, enabling broader adoption and easier maintenance. Technologies/skills demonstrated: - Performance-focused refactoring (CrosshairsTool, viewport listeners, absolute camera usage). - Accessibility improvements (CinePlayer refactor: Button to div, enhanced prop types, loading indicators, data sources). - Strengthened security hygiene (auth.json gitignore across repos).

Month 2026-03 – cornerstonejs/cornerstone3D: Delivered CI workflow and testing enhancements for OHIF downstream, expanded test coverage with unit and Playwright end-to-end tests, improved local development scripts for linking Cornerstone packages, and enabled file input functionality in setup. These changes strengthen CI/CD, accelerate PR validation, and enhance developer experience with streamlined setup and observable test artifacts. Key commits include cc4b7cb76d18679780bc2b8bc38f4da7f328fd29 (CI/workflows, OHIF downstream scripts) and 90acd90cdc36844ef20a8f65509bc8c467219101 (setup file input uncomment).

February 2026 — Cornerstone3D annotation UX and text box placement enhancements focused on reliability, usability, and maintainability. Implemented new interaction bindings, enhanced text box placement logic across tools, and added robust tests to guard against regressions. These changes reduce annotation time, improve accuracy, and support consistent rendering across across devices.

January 2026 performance summary for cornerstone3D and OHIF/Viewers. Focused on delivering features that improve multi-view visualization, 4D cardiac data handling, and robustness of dynamic volumes. Key outcomes include multi-viewport region segmentation enhancements, improved 4D cardiac data handling with utilities refactor, and stability improvements in NM module dynamic volumes. Collectively, these changes advance clinical workflows by enabling faster, more reliable imaging comparisons across multiple viewports and datasets.

December 2025 monthly summary focusing on business value and technical achievements across cornerstone3D and OHIF/Viewers. Delivered notable features and fixes including advanced magnify tool improvements with world-coordinate handles, multiframe 4D image splitting support, dynamic volume handling refinements, and preclinical cine playback stability. These efforts enhanced imaging accuracy, reliability, and maintainability, enabling faster clinical workflows and more robust data handling.

Monthly summary for 2025-11 across cornerstonejs/cornerstone3D and OHIF/Viewers focusing on delivered features, minor maintenance, and impact. This period delivered stability-focused improvements and enhanced onboarding through targeted documentation updates.

October 2025 focused on stability and predictable UX across cornerstone3D and OHIF/Viewers. The month delivered critical reliability improvements through targeted bug fixes, enhanced test coverage, and refined UI behavior for multi-study navigation and segmentation workflows. These changes reduce crash risk, prevent UI duplicates, and provide a smoother clinical workflow experience.

2025-08 monthly summary for cornerstone3D and OHIF/Viewers. Focused on improving build reliability, enabling smooth migrations, and enhancing user-facing features. Delivered tooling/CI/CD modernization across Cornerstone3D, introduced interactive color tools in the web loader, prepared Cornerstone3D 4.0 with migration guidance and Node.js 20 compatibility, and advanced OHIF v3.11 readiness including CI/CD optimizations, core library upgrades, and documentation improvements. Also added ultrasound annotation enhancements (pleura percentage) to the OHIF USAnnotationPanel UI, improving precision for ultrasound workflows across L/V/POC use-cases.

July 2025 monthly summary for cornerstone3D focusing on startup reliability and segmentation state management. Delivered a targeted bug fix to ensure a valid active segment is selected during initialization, preventing undefined state and improving first-use interaction. The change aligns with our practice of making startup paths robust and minimizing user friction in segmentation workflows. Linked to commit c7ece43c3d26585c7e5c35b8986c65f6576cba51 ("fix first segment active (#2231)").

June 2025 focused on two high-impact features for OHIF/Viewers plus stabilizing the build and test pipelines to support faster delivery and smoother migrations. Key efforts delivered improved migration clarity for OHIF Platform v3.10, enhanced test reliability, and robust ultrasound annotation feature builds across environments. A critical build pipeline fix further reduced integration friction, enabling quicker validation of PRs.

May 2025 monthly summary for cornerstone3D and OHIF/Viewers focused on delivering AI-enabled documentation tooling, enhancing interactive rendering, and stabilizing UI/CI processes to drive developer velocity and product reliability.

April 2025 performance highlights across cornerstone3D and OHIF/Viewers. Delivered substantial feature enhancements in segmentation workflows and rendering, stabilized tests and artifacts, and strengthened CI/CD. Improvements drove faster, more reliable segmentation and rendering, with AI-assisted capabilities expanding the product’s value proposition, while sustaining high test reliability and developer velocity.

March 2025 performance highlights for cornerstonejs/cornerstone3D and OHIF/Viewers. Delivered major segmentation tooling enhancements across cornerstone3D with reliability and performance gains, expanded editor-like capabilities, and improved rendering quality. Implemented acquisition-plane viewport positioning logic, enhanced annotation/labelmap reliability, and completed maintenance upgrades to core libraries. In OHIF/Viewers, introduced a UI overhaul for toolbars/toolbox, expanded segmentation features with preview/selection, and hardened metadata handling and WADO loading. Achieved stronger cross-viewport coordination for measurements and jump-to-measurement workflows, while upgrading dependencies and instituting automated dependency updates.

February 2025 monthly summary: Delivered core data handling, rendering robustness, and feature maturation across Cornerstone3D and OHIF/Viewers. Focused on scalable data workflows, stable ITK integration, and user-facing visualization capabilities to strengthen clinical reliability and developer productivity.

January 2025 monthly summary for CornerstoneJS and OHIF Viewer teams focused on delivering high-value image viewing workflows, improving data handling for 4D volumes, and strengthening build/deploy reliability across platforms. The month balanced feature delivery with robust bug fixes to enhance reliability and performance in clinical workloads.

Month: 2024-12. Focused on delivering user-facing segmentation and rendering enhancements, stabilizing rendering and data management, expanding tooling with WebAssembly support, and modernizing CI/CD and runtime environments. Across cornerstone3D and OHIF/Viewers, shipped features that improve rendering quality, reliability for dynamic data, and navigation against large datasets, enabling faster time-to-value for clinicians and developers while strengthening platform stability for production deployments.

November 2024: Achieved major segmentation and interoperability improvements with Cornerstone3D and OHIF/Viewers, accelerated CI/build reliability with Bun, improved rendering stability and DICOM data handling, and delivered performance gains through a tooling migrations and UX enhancements. This period delivered measurable business value through faster pipelines, more capable image segmentation workflows, and a more robust, user-friendly viewer experience.