How to Use This Tool

Getting Started

This interactive tool helps you perform precise cervical spine measurements on lateral X-rays. Import your patient's X-ray image, select measurement tools, and place reference points to calculate key biomechanical parameters.

Measurement Workflow

• Import X-ray: Click "Choose X-ray Image" to load a lateral cervical X-ray. Adjust image opacity using the slider for optimal line visibility.
• Select Tool: Click one of the measurement buttons (e.g., "C2-C7 Cobb Angle"). The active tool will be highlighted in green.
• Place Points: Click on the X-ray image to place measurement points. Each tool requires a specific number of points (typically 2-4 clicks).
• View Results: Measurements automatically calculate and display in the Measurements panel with color-coded indicators (green = normal, orange = borderline, red = abnormal).
• Customize Appearance: Change line color and thickness using the Display Options before placing measurements.

Measurement Tools Explained

• C2-C7 Cobb Angle: Measures cervical lordosis. Click on the posterior-inferior corner of C2, then C2's posterior-superior corner, then C7's posterior-inferior corner, and finally C7's posterior-superior corner. Normal range: 34-42°.
• Atlas Plane Line: Reference line along the inferior surface of the atlas (C1). Click two points to draw the line.
• Anterior Head Translation: Measures forward head posture. Requires 4 points: two for the vertical reference line through C7, and two defining the anterior projection of C1. Normal: <15mm.
• George's Line: Posterior vertebral body line to assess alignment. Click along the posterior margins of vertebral bodies.
• Disc Heights: Click on the superior and inferior endplates of each disc space you want to measure. Average height calculates automatically. Normal: 5-7mm.
• Cervical Gravity Line: Vertical plumb line assessment. Click two points to draw the reference line.
• Occiput-Atlas Angle: Measures C0-C1 relationship. Requires 4 points: two for McGregor's line (basion to opisthion), and two for the atlas plane. Normal: 4-9°.

Tips for Accurate Measurements

• Use high-quality lateral cervical X-rays with clear vertebral landmarks.
• Adjust image opacity to balance X-ray visibility with measurement line contrast.
• Zoom your browser if needed for precise point placement on small anatomical structures.
• Use different colors for different measurements to avoid confusion when multiple lines are present.
• Export your annotated image before clearing measurements to preserve your work.
• Measurements update automatically as you place points - no need to click "calculate".

Exporting Your Work

Click "Export Image with Measurements" to download a PNG file containing the X-ray with your measurement lines and a summary overlay showing all calculated values and the current date. This export is suitable for patient records and reports.

Resetting and Clearing

• Reset View: Returns opacity and line thickness to default values without erasing measurements.
• Clear All Measurements: Removes all placed points and measurements. You will be prompted to confirm this action.