Viewer Basics

There are 4 main components to the annotation interface. We will refer to each of these components throughout the documentation.

1. Left Sidebar - where you create, edit, and interact with annotations and attributes.

2. Top Bar - contains Task-level actions such as task submission and saving and the environment settings (Windowing, Layout), Version Explorer, Segmentation Tools, and Quick Measurement Tools.

3. Context Panel - shows additional information and settings for any currently selected tool(s) or open panels.

4. Main Canvas - where you interact with your images and apply your annotations to your images/volumes.

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Viewing and Navigating Your Volume

Interacting with your images in RedBrick AI is similar to other medical imaging and PACS viewers. This section covers the basic shortcuts and functions for navigating through a volume.

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Changing Slices

1. Scroll: Scroll over any of the viewports.

2. UI: Use the viewport’s slider or up/down slice buttons.

3. Shortcut: Use the up arrow and down arrow keyboard shortcuts on the selected viewport.

4. Quick slice change: Hold alt/option and left click drag to quickly change slices.

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Zoom and Pan

1. Zoom: Hold ctrl and scroll to zoom.

2. Quick zoom: Hold ctrl and right click drag for a quick zoom.

3. Pan: Hold shift and left click drag to pan.

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Windowing

1. UI: Adjust windowing on the context panel by activating it from the top bar.

2. Shortcut: Hold CTRL and left click drag vertically to adjust the Windowing Level and horizontally to adjust the Windowing Width.

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3D Model Viewing

1. Rotate: Left click drag to rotate the volume in 3D.

2. Rotate fixed plane: Hold ctrl and left click drag to rotate the model fixed in the plane.

3. Pan: Hold shift and left click drag to pan.

4. Zoom: Hold ctrl/cmd and scroll to zoom.

1. Rendering preset: adjusts the photorealistic rendering style.

2. Shift: adjusts the volume rendering transfer function to modify the rendering.

3. Maximum opacity: sets the maximum voxel opacity of the rendered image.

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Crosshairs and Oblique Planes

Crosshairs will synchronize multiple projections of a single volume. Oblique planes allow you to view a non-orthogonal view of a volume.

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Crosshairs

1. Activate: From the top bar or by pressing c.

2. Deactivate: From the top bar or by pressing esc. By default, deactivated crosshairs will be shown on the canvas and can be reactivated by selecting them. To hide deactivated cross-hairs press cmd/ctrl shift c.

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Oblique Planes

1. Activate: Right click on any viewport, then select activate oblique. This will enable an oblique plane for just the selected projection.

2. Usage: The oblique plane crosshair for each viewport will be color-coded. For example, the Sagittal oblique plane is purple in the video below. Rotating the purple crosshair creates an oblique plane on the Sagittal view.

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Maximum and minimum intensity projection (MIP)

Maximum Intensity Projection (MIP) displays the highest intensity values in a 3D image along a viewing axis, useful for highlighting bright structures like blood vessels. Minimum Intensity Projection shows the lowest values, useful for revealing dark structures like airways.

To activate, change the displayed view to MIP in any viewport using the view dropdown on the top left.

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Managing your Layout

RedBrick AI’s viewer can be customized to display studies and series in a huge range of configurations, either manually or by using hanging protocols to display single or multiple series.

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Changing Layout and Displaying Series

1. Change layout grid: Each modality has a default layout grid which can be modified from the layout grid on the top bar. The viewer supports everything between 1x1 and 3x3, showing a maximum of 9 views.

2. Displaying series: You can customize what is shown in each viewport; this can be any 2D or 3D view.

   • Drag and drop: You can drag and drop any series or projection from the layout context panel to a target viewport.

     Drag and drop.

   • Viewport selector: You can use the dropdown on any viewport to cycle between projections of that series.

     Viewport selector.

   • Quick change: You can hover over the thumbnails on the layout context panel to directly place the view in the corresponding layout position.

     Quick change.

3. Maximize and minimize view: When you have more than 2 views displayed, you can maximize 1 viewport so that it’s larger than the rest. Pressing enter will expand the currently selected viewport. Alternatively, you can right click and select maximize viewport on the layout menu.

4. Full-screen mode: Press f to enter full-screen mode for distraction-free annotation.

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Multiplanar reconstruction (MPR)

1. Manually: You can create an MPR view by manually configuring the viewport and selecting the projections of your series following the instructions above.

2. Right-click menu: You can also display an MPR view by right click on the viewport and selecting MPR layout. This will create a new layout tab with the MPR view.

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Creating Multiple Layout Tabs

Often you may want to move between two pre-set viewing configurations. For example, between a large 3D view and a view of all projections - Sagittal, Coronal, and Axial. This can be accomplished by creating multiple layout tabs.

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Study Selector

As of version 1.1.2, RedBrick AI allows you to add an extra layer of verticality to your studies in the Annotation Tool.

If you have uploaded Series that share a common StudyInstanceUID, the Study Selector will display each Study in the righthand Context Panel for ease of browsing and selecting the scans you need while configuring your layout tabs.

Simply click on a DICOM Study to expand a list of its associated Series.

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Command Bar

RedBrick AI’s Command Bar is an app-wide pop-up interface that provides a comprehensive list of all available functions and keyboard shortcuts.

You can access it by pressing CMD+K (MacOS) or CTRL+K (Windows).

In the Dashboard, the Command Bar can be used to easily reference your custom shortcuts and navigate between Projects and Workspaces.

In the Editor, the Command Bar also allows you to access several other lesser-known tools and features, such as:

• Manual Backup - download all of the data associated with the current Task, AKA the “emergency backup” button

• Prune Segmentations - delete all segmentation Entities that do not have masks on the canvas

• Toggle Comment Pins

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