Node.js DICOM

The package provides the following:

• Data dictionary according to the 2014a standard.
• Streaming DICOM Decoder that reads a DICOM stream end emits DicomEvent instances.
• Streaming JSON Encoder that turns a DicomEvent stream into a DICOM JSON Model
• JSON Sink that consumes the JSON Model stream and produces an in-memory JSON Object.

Limitations:

• ISO 2022 character sets are not in iconv-lite, this means the decoder does not currently support ISO 2022 encodings, multi-valued (0008,0005) Specific Character Set and DICOM characterset extensions.
• Dicom Elements with a value length above a configurable threshold are not constructed in-memory, but emitted as start_element, a sequence of raw events with the encoded value and an end_element event. The JSON Encoder currently ignores these bulkdata stream parts.

Examples:

The examples given here will not work if you installed via npm. The README for the last npm release is at https://github.com/grmble/node-dicom/tree/e145f6c4b6e31e19d73e20777bda8c656996a4b2

Read a DICOM file, produce JSON Model, and print some data:

dicom = require "dicom"

decoder = dicom.decoder {guess_header: true}
encoder = new dicom.json.JsonEncoder()
sink = new dicom.json.JsonSink (err, json) ->
  if err
    console.log "Error:", err
    process.exit 10
  print_element json, dicom.tags.PatientID
  print_element json, dicom.tags.IssuerOfPatientID
  print_element json, dicom.tags.StudyInstanceUID
  print_element json, dicom.tags.AccessionNumber

print_element = (json, path...) ->
  console.log dicom.json.get_value(json, path...)

require("fs").createReadStream(process.argv[2]).pipe decoder
.pipe encoder
.pipe sink

And the same thing in Javascript:

"use strict";

var dicom = require("dicom");

var decoder = dicom.decoder({
    guess_header: true
});

var encoder = new dicom.json.JsonEncoder();

var print_element = function(json, elem) {
    console.log(dicom.json.get_value(json, elem));
};

var sink = new dicom.json.JsonSink(function(err, json) {
    if (err) {
      console.log("Error:", err);
      process.exit(10);
    }
    print_element(json, dicom.tags.PatientID);
    print_element(json, dicom.tags.IssuerOfPatientID);
    print_element(json, dicom.tags.StudyInstanceUID);
    print_element(json, dicom.tags.AccessionNumber);
});

require("fs").createReadStream(process.argv[2]).pipe(decoder).pipe(encoder).pipe(sink);