Unable to understand API /studies/:studiesId/series/:seriesID/instances/:instancesID/frames/:frames

Development
1

I got an API calling “/studies/:studiesId/series/:seriesID/instances/:instancesID/frames/:frames” from OHIF.

I have checked all the possible ways but could not get…

  1. what data is sending in response
  2. how to send data in response

I am hitting this API in NODE using express js.

OHIF documentation described all the API but forget to describe frame API.
Its very difficult to understand by beginner.

2

It’s part of the DICOMweb standard, see e.g.

3

I have getting this API but dont know what data to be send from dicom file.

router.get(‘/studies/:studiesId/series/:seriesID/instances/:instancesID/frames/:frames’, (req, res) => {
var studiesId = req.params.studiesId
var seriesID = req.params.seriesID
var instancesID = req.params.instancesID
var frames = req.params.frames
var fs = require(‘fs’)

var dicomParser = require(‘dicom-parser’);
var fs = require(‘fs’)
var data = fs.readFileSync(“E:\bangladesh\Mams\MAMS_India_Today_Image\Dicom_files\11883014\DICOM\PN0\STUDY1\SERIES1\IMAGE1”)
try
{

  // Allow raw files
  const options = { TransferSyntaxUID: '1.2.840.10008.1.2' };
  // Parse the byte array to get a DataSet object that has the parsed contents
  var dataSet = dicomParser.parseDicom(data, options);
  // access a string element
  var studyInstanceUid = dataSet.string('x0020000d');
  console.log("studyInstanceUid",studyInstanceUid);

  // get the pixel data element (contains the offset and length of the data)
  var pixelDataElement = dataSet.elements.x7fe00010 || dataSet.elements.x7fe00008 || dataSet.elements.x7fe00009;
  var pixelData = new Uint8Array(dataSet.byteArray.buffer, pixelDataElement.dataOffset, pixelDataElement.length / 2);
  // var pixelData = new Uint8Array(dataSet.byteArray.buffer, pixelDataElement.dataOffset, pixelDataElement.length / 2);
  // var pixelData = new Uint16Array(dataSet.byteArray.buffer, pixelDataElement.dataOffset, pixelDataElement.length / 2);

  pixelData = `

${’ --6b4d1648-ee27-472d-9951-4192b5abff74’}
${‘Content-Location: E:\bangladesh\Mams\MAMS_India_Today_Image\Dicom_files\11883014\DICOM\PN0\STUDY1\SERIES1\IMAGE1’}
${‘Content-ID: d615df89-a84b-4569-96fd-b582fd026ca8@resteasy-multipart’}
${‘Content-Type: application/octet-stream’}

${pixelData}
${’ --6b4d1648-ee27-472d-9951-4192b5abff74–'}`

  res.send(pixelData)  // sending this data is giving mime type error

}
catch(ex)
{
console.log(‘Error parsing byte stream’, ex);
}