ECG waveform visualization

Visualize and review DICOM ECG waveform data.

Problem

You’ve loaded a DICOM ECG waveform file and need to perform interactive caliper measurements — measuring the time interval between two points on the waveform trace. This is the equivalent of measuring QRS duration or RR interval on an ECG strip, but done digitally inside the DICOM viewer.

Steps

1. Open the ECG DICOM file (⌘O) — e.g. ecg-test.dcm.

2. Open the ECG tab in the right rail. The waveform channel container with an SVG rendering of the trace is displayed.

3. Draw a caliper measurement — click and drag on the SVG waveform:

   • Move the pointer to the start point on the trace
   • Press and hold the mouse button
   • Drag horizontally to the end point
   • Release to finalize

4. Read the measurement — a caliper metrics badge appears showing the time interval in milliseconds (ms).

5. Clear the caliper — click the ✕ (clear) button to dismiss the measurement. The metrics badge disappears.

Expected Result

• An SVG waveform is rendered in the ECG panel.
• Click-and-drag on the SVG creates a caliper measurement.
• The measurement badge displays the time interval in milliseconds (ms).
• The clear button removes the caliper and the metrics badge.
• The waveform channel container is visible and properly rendered.