Render Volume

In this tutorial, you will learn how to render a volume.

Preface

In order to render a volume we need:

Initialize cornerstone and related libraries.
HTMLDivElements to render different orientation of the volume (e.g., one for Axial, one for Sagittal)
The path to the images (imageIds).

Implementation

import { init as coreInit } from '@cornerstonejs/core';
import { init as dicomImageLoaderInit } from '@cornerstonejs/dicom-image-loader';

await coreInit();
await dicomImageLoaderInit();

We have already stored images on a server for the purpose of this tutorial.

First let's create two HTMLDivElements and style them to contain viewports.

const content = document.getElementById('content');

const viewportGrid = document.createElement('div');
viewportGrid.style.display = 'flex';
viewportGrid.style.flexDirection = 'row';

// element for axial view
const element1 = document.createElement('div');
element1.style.width = '500px';
element1.style.height = '500px';

// element for sagittal view
const element2 = document.createElement('div');
element2.style.width = '500px';
element2.style.height = '500px';

viewportGrid.appendChild(element1);
viewportGrid.appendChild(element2);

content.appendChild(viewportGrid);

Next, we need a renderingEngine

const renderingEngineId = 'myRenderingEngine';
const renderingEngine = new RenderingEngine(renderingEngineId);

Loading a volume is possible by using the volumeLoader API.

const volumeId = 'myVolume';

// Define a volume in memory
const volume = await volumeLoader.createAndCacheVolume(volumeId, { imageIds });

We can then create a viewports inside the renderingEngine by using the setViewports API.

const viewportId1 = 'CT_AXIAL';
const viewportId2 = 'CT_SAGITTAL';

const viewportInput = [
  {
    viewportId: viewportId1,
    element: element1,
    type: ViewportType.ORTHOGRAPHIC,
    defaultOptions: {
      orientation: Enums.OrientationAxis.AXIAL,
    },
  },
  {
    viewportId: viewportId2,
    element: element2,
    type: ViewportType.ORTHOGRAPHIC,
    defaultOptions: {
      orientation: Enums.OrientationAxis.SAGITTAL,
    },
  },
];

renderingEngine.setViewports(viewportInput);

RenderingEngine will handle creation of the viewports. Next, we need to perform the load on the volume.

Important

Defining a volume is not the same as loading it.

// Set the volume to load
volume.load();

Finally, let the viewports know about the volume.

setVolumesForViewports(
  renderingEngine,
  [{ volumeId }],
  [viewportId1, viewportId2]
);

// Render the image
renderingEngine.renderViewports([viewportId1, viewportId2]);

Final code

Click to see the full code

import {
  init as coreInit,
  RenderingEngine,
  Enums,
  volumeLoader,
  setVolumesForViewports,
} from '@cornerstonejs/core';
import { init as dicomImageLoaderInit } from '@cornerstonejs/dicom-image-loader';
import { createImageIdsAndCacheMetaData } from '../../../../utils/demo/helpers';

const { ViewportType } = Enums;

const content = document.getElementById('content');

const viewportGrid = document.createElement('div');
viewportGrid.style.display = 'flex';
viewportGrid.style.flexDirection = 'row';

// element for axial view
const element1 = document.createElement('div');
element1.style.width = '500px';
element1.style.height = '500px';

// element for sagittal view
const element2 = document.createElement('div');
element2.style.width = '500px';
element2.style.height = '500px';

viewportGrid.appendChild(element1);
viewportGrid.appendChild(element2);

content.appendChild(viewportGrid);
// ============================= //

async function run() {
  await coreInit();
  await dicomImageLoaderInit();

  // Get Cornerstone imageIds and fetch metadata into RAM
  const imageIds = await createImageIdsAndCacheMetaData({
    StudyInstanceUID:
      '1.3.6.1.4.1.14519.5.2.1.7009.2403.334240657131972136850343327463',
    SeriesInstanceUID:
      '1.3.6.1.4.1.14519.5.2.1.7009.2403.226151125820845824875394858561',
    wadoRsRoot: 'https://d3t6nz73ql33tx.cloudfront.net/dicomweb',
  });

  // Instantiate a rendering engine
  const renderingEngineId = 'myRenderingEngine';
  const renderingEngine = new RenderingEngine(renderingEngineId);

  const volumeId = 'myVolume';

  // Define a volume in memory
  const volume = await volumeLoader.createAndCacheVolume(volumeId, {
    imageIds,
  });

  const viewportId1 = 'CT_AXIAL';
  const viewportId2 = 'CT_SAGITTAL';

  const viewportInput = [
    {
      viewportId: viewportId1,
      element: element1,
      type: ViewportType.ORTHOGRAPHIC,
      defaultOptions: {
        orientation: Enums.OrientationAxis.AXIAL,
      },
    },
    {
      viewportId: viewportId2,
      element: element2,
      type: ViewportType.ORTHOGRAPHIC,
      defaultOptions: {
        orientation: Enums.OrientationAxis.SAGITTAL,
      },
    },
  ];

  renderingEngine.setViewports(viewportInput);

  volume.load();

  setVolumesForViewports(
    renderingEngine,
    [{ volumeId }],
    [viewportId1, viewportId2]
  );
}

run();

You should be able to see:

Learn more about:

For advanced usage of Volume Viewport, please visit VolumeViewport API example page.

Tip

Visit Examples page to see how to run the examples locally.

Preface​

Implementation​

Step 1: Initialize cornerstone and related libraries​

Final code​

Read more​

Preface

Implementation

Step 1: Initialize cornerstone and related libraries

Final code

Read more