cornerstoneWADOImageLoader.external.cornerstone = cornerstone;

var webWorkerUrl = 'scripts/cornerstone/cornerstoneWADOImageLoaderWebWorker.js';
var codecsUrl = 'cornerstoneWADOImageLoaderCodecs.js';

var config = {
     webWorkerPath : webWorkerUrl,
     taskConfiguration: {
         'decodeTask' : {
             codecsPath: codecsUrl
         }
     }
 };
cornerstoneWADOImageLoader.webWorkerManager.initialize(config);