@cleerlycode/cornerstone-wado-image-loader
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Cornerstone ImageLoader for DICOM WADO-URI
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<a href="../../../index.html">all files</a> / <a href="index.html">src/imageLoader/wadors/</a> loadImage.js
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<span class="strong">39.29% </span>
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">import metaDataManager from './metaDataManager.js';
import getPixelData from './getPixelData.js';
import createImage from '../createImage.js';
/**
* Helper method to extract the transfer-syntax from the response of the server.
* @param {string} contentType The value of the content-type header as returned by the WADO-RS server.
* @return The transfer-syntax as announced by the server, or Implicit Little Endian by default.
*/
export function getTransferSyntaxForContentType (contentType) {
let transferSyntax = '1.2.840.10008.1.2'; // Default is Implicit Little Endian.
if (contentType) {
// Browse through the content type parameters
const parameters = contentType.split(';');
for (const parameterIndex in parameters) {
let parameter = parameters[parameterIndex];
// Look for a transfer-syntax=XXXX pair
const parameterValues = parameter.split('=');
if (parameterValues.length !== 2) {
continue;
}
if (parameterValues[0].trim() === 'transfer-syntax') {
transferSyntax = parameterValues[1].trim() || transferSyntax;
}
}
}
return transferSyntax;
}
function loadImage (imageId, options) <span class="fstat-no" title="function not covered" >{</span>
const start = <span class="cstat-no" title="statement not covered" >new Date().getTime();</span>
const uri = <span class="cstat-no" title="statement not covered" >imageId.substring(7);</span>
const promise = <span class="cstat-no" title="statement not covered" >new Promise((resolve, reject) => <span class="fstat-no" title="function not covered" >{</span></span>
// check to make sure we have metadata for this imageId
const metaData = <span class="cstat-no" title="statement not covered" >metaDataManager.get(imageId);</span>
<span class="cstat-no" title="statement not covered" > if (metaData === undefined) {</span>
const error = <span class="cstat-no" title="statement not covered" >new Error(`no metadata for imageId ${imageId}`);</span>
<span class="cstat-no" title="statement not covered" > return reject(error);</span>
}
// TODO: load bulk data items that we might need
const mediaType = <span class="cstat-no" title="statement not covered" >'multipart/related; type="application/octet-stream"';</span> // 'image/dicom+jp2';
// get the pixel data from the server
<span class="cstat-no" title="statement not covered" > getPixelData(uri, imageId, mediaType).then((result) => <span class="fstat-no" title="function not covered" >{</span></span>
const transferSyntax = <span class="cstat-no" title="statement not covered" >getTransferSyntaxForContentType(result.contentType);</span>
const pixelData = <span class="cstat-no" title="statement not covered" >result.imageFrame.pixelData;</span>
const imagePromise = <span class="cstat-no" title="statement not covered" >createImage(imageId, pixelData, transferSyntax, options);</span>
<span class="cstat-no" title="statement not covered" > imagePromise.then((image) => <span class="fstat-no" title="function not covered" >{</span></span>
// add the loadTimeInMS property
const end = <span class="cstat-no" title="statement not covered" >new Date().getTime();</span>
<span class="cstat-no" title="statement not covered" > image.loadTimeInMS = end - start;</span>
<span class="cstat-no" title="statement not covered" > resolve(image);</span>
}, reject);
}, reject);
});
<span class="cstat-no" title="statement not covered" > return {</span>
promise,
cancelFn: undefined
};
}
export default loadImage;
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