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Récupérer une étude DICOM

Renvoyez toutes les instances DICOM d'une étude donnée.

En savoir plus

Pour obtenir une documentation détaillée incluant cet exemple de code, consultez les articles suivants :

Utiliser la norme DICOMweb

Exemple de code

Go

Avant d'essayer cet exemple, suivez les instructions de configuration pour Go du guide de démarrage rapide de l'API Cloud Healthcare à l'aide des bibliothèques clientes. Pour en savoir plus, consultez la documentation de référence de l'API Cloud Healthcare Go.

Pour vous authentifier auprès de l'API Cloud Healthcare, configurez les Identifiants par défaut de l'application. Pour en savoir plus, consultez Configurer l'authentification pour un environnement de développement local.

import (
	"context"
	"fmt"
	"io"
	"os"

	healthcare "google.golang.org/api/healthcare/v1"
)

// dicomWebRetrieveStudy retrieves all instances in the given dicomWebPath
// study.
func dicomWebRetrieveStudy(w io.Writer, projectID, location, datasetID, dicomStoreID, dicomWebPath string, outputFile string) error {
	// projectID := "my-project"
	// location := "us-central1"
	// datasetID := "my-dataset"
	// dicomStoreID := "my-dicom-store"
	// dicomWebPath := "studies/1.3.6.1.4.1.11129.5.5.111396399857604"
	// outputFile := "study.multipart"
	ctx := context.Background()

	healthcareService, err := healthcare.NewService(ctx)
	if err != nil {
		return fmt.Errorf("healthcare.NewService: %w", err)
	}

	storesService := healthcareService.Projects.Locations.Datasets.DicomStores.Studies

	parent := fmt.Sprintf("projects/%s/locations/%s/datasets/%s/dicomStores/%s", projectID, location, datasetID, dicomStoreID)

	resp, err := storesService.RetrieveStudy(parent, dicomWebPath).Do()
	if err != nil {
		return fmt.Errorf("RetrieveStudy: %w", err)
	}

	defer resp.Body.Close()

	if resp.StatusCode > 299 {
		return fmt.Errorf("RetrieveStudy: status %d %s: %s", resp.StatusCode, resp.Status, resp.Body)
	}

	file, err := os.Create(outputFile)
	if err != nil {
		return fmt.Errorf("os.Create: %w", err)
	}
	defer file.Close()
	if _, err := io.Copy(file, resp.Body); err != nil {
		return fmt.Errorf("io.Copy: %w", err)
	}

	// When specifying the output file, use an extension like ".multipart".
	// Then, parse the downloaded multipart file to get each individual DICOM
	// file.
	fmt.Fprintf(w, "Study retrieved and downloaded to file: %v\n", outputFile)

	return nil
}

Java

Avant d'essayer cet exemple, suivez les instructions de configuration pour Java du guide de démarrage rapide de l'API Cloud Healthcare à l'aide des bibliothèques clientes. Pour en savoir plus, consultez la documentation de référence de l'API Cloud Healthcare Java.

import com.google.api.client.http.HttpHeaders;
import com.google.api.client.http.HttpRequestInitializer;
import com.google.api.client.http.HttpResponse;
import com.google.api.client.http.javanet.NetHttpTransport;
import com.google.api.client.json.JsonFactory;
import com.google.api.client.json.gson.GsonFactory;
import com.google.api.services.healthcare.v1.CloudHealthcare;
import com.google.api.services.healthcare.v1.CloudHealthcare.Projects.Locations.Datasets.DicomStores.Studies;
import com.google.api.services.healthcare.v1.CloudHealthcareScopes;
import com.google.auth.http.HttpCredentialsAdapter;
import com.google.auth.oauth2.GoogleCredentials;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Collections;

public class DicomWebRetrieveStudy {
  private static final String DICOM_NAME = "projects/%s/locations/%s/datasets/%s/dicomStores/%s";
  private static final JsonFactory JSON_FACTORY = new GsonFactory();
  private static final NetHttpTransport HTTP_TRANSPORT = new NetHttpTransport();

  public static void dicomWebRetrieveStudy(String dicomStoreName, String studyId)
      throws IOException {
    // String dicomStoreName =
    //    String.format(
    //        DICOM_NAME, "your-project-id", "your-region-id", "your-dataset-id", "your-dicom-id");
    // String studyId = "your-study-id";

    // Initialize the client, which will be used to interact with the service.
    CloudHealthcare client = createClient();

    // Create request and configure any parameters.
    Studies.RetrieveStudy request =
        client
            .projects()
            .locations()
            .datasets()
            .dicomStores()
            .studies()
            .retrieveStudy(dicomStoreName, "studies/" + studyId);

    // Execute the request and process the results.
    HttpResponse response = request.executeUnparsed();

    // When specifying the output file, use an extension like ".multipart".
    // Then, parse the downloaded multipart file to get each individual
    // DICOM file.
    String outputPath = "study.multipart";
    OutputStream outputStream = new FileOutputStream(new File(outputPath));
    try {
      response.download(outputStream);
      System.out.println("DICOM study written to file " + outputPath);
    } finally {
      outputStream.close();
    }

    if (!response.isSuccessStatusCode()) {
      System.err.print(
          String.format("Exception retrieving DICOM study: %s\n", response.getStatusMessage()));
      throw new RuntimeException();
    }
  }

  private static CloudHealthcare createClient() throws IOException {
    // Use Application Default Credentials (ADC) to authenticate the requests
    // For more information see https://cloud.google.com/docs/authentication/production
    GoogleCredentials credential =
        GoogleCredentials.getApplicationDefault()
            .createScoped(Collections.singleton(CloudHealthcareScopes.CLOUD_PLATFORM));

    HttpHeaders headers = new HttpHeaders();
    // The response's default transfer syntax is Little Endian Explicit.
    // As a result, if the file was uploaded using a compressed transfer syntax,
    // the returned object will be decompressed. This can negatively impact performance and lead
    // to errors for transfer syntaxes that the Cloud Healthcare API doesn't support.
    // To avoid these issues, and if the returned object's transfer syntax doesn't matter to
    // your application, use the
    // multipart/related; type="application/dicom"; transfer-syntax=* Accept Header.
    headers.setAccept("multipart/related; type=application/dicom; transfer-syntax=*");
    // Create a HttpRequestInitializer, which will provide a baseline configuration to all requests.
    HttpRequestInitializer requestInitializer =
        request -> {
          new HttpCredentialsAdapter(credential).initialize(request);
          request.setConnectTimeout(60000); // 1 minute connect timeout
          request.setReadTimeout(60000); // 1 minute read timeout
        };

    // Build the client for interacting with the service.
    return new CloudHealthcare.Builder(HTTP_TRANSPORT, JSON_FACTORY, requestInitializer)
        .setApplicationName("your-application-name")
        .build();
  }
}

Node.js

Avant d'essayer cet exemple, suivez les instructions de configuration pour Node.js du guide de démarrage rapide de l'API Cloud Healthcare à l'aide des bibliothèques clientes. Pour en savoir plus, consultez la documentation de référence de l'API Cloud Healthcare Node.js.

const google = require('@googleapis/healthcare');
const healthcare = google.healthcare({
  version: 'v1',
  auth: new google.auth.GoogleAuth({
    scopes: ['https://www.googleapis.com/auth/cloud-platform'],
  }),
});
const fs = require('fs');
const util = require('util');
const writeFile = util.promisify(fs.writeFile);
// When specifying the output file, use an extension like ".multipart."
// Then, parse the downloaded multipart file to get each individual
// DICOM file.
const fileName = 'study_file.multipart';

const dicomWebRetrieveStudy = async () => {
  // TODO(developer): uncomment these lines before running the sample
  // const cloudRegion = 'us-central1';
  // const projectId = 'adjective-noun-123';
  // const datasetId = 'my-dataset';
  // const dicomStoreId = 'my-dicom-store';
  // const studyUid = '1.3.6.1.4.1.5062.55.1.2270943358.716200484.1363785608958.61.0';
  const parent = `projects/${projectId}/locations/${cloudRegion}/datasets/${datasetId}/dicomStores/${dicomStoreId}`;
  const dicomWebPath = `studies/${studyUid}`;
  const request = {parent, dicomWebPath};

  const study =
    await healthcare.projects.locations.datasets.dicomStores.studies.retrieveStudy(
      request,
      {
        headers: {
          Accept:
            'multipart/related; type=application/dicom; transfer-syntax=*',
        },
        responseType: 'arraybuffer',
      }
    );

  const fileBytes = Buffer.from(study.data);

  await writeFile(fileName, fileBytes);
  console.log(
    `Retrieved study and saved to ${fileName} in current directory`
  );
};

dicomWebRetrieveStudy();

Python

Avant d'essayer cet exemple, suivez les instructions de configuration pour Python du guide de démarrage rapide de l'API Cloud Healthcare à l'aide des bibliothèques clientes. Pour en savoir plus, consultez la documentation de référence de l'API Cloud Healthcare Python.

def dicomweb_retrieve_study(
    project_id, location, dataset_id, dicom_store_id, study_uid
):
    """Handles the GET requests specified in the DICOMweb standard.

    See https://github.com/GoogleCloudPlatform/python-docs-samples/tree/main/healthcare/api-client/v1/dicom
    before running the sample."""

    # Imports the google.auth.transport.requests transport
    from google.auth.transport import requests

    # Imports a module to allow authentication using Application Default Credentials (ADC)
    import google.auth

    # Gets credentials from the environment. google.auth.default() returns credentials and the
    # associated project ID, but in this sample, the project ID is passed in manually.
    credentials, _ = google.auth.default()

    scoped_credentials = credentials.with_scopes(
        ["https://www.googleapis.com/auth/cloud-platform"]
    )
    # Creates a requests Session object with the credentials.
    session = requests.AuthorizedSession(scoped_credentials)

    # URL to the Cloud Healthcare API endpoint and version
    base_url = "https://healthcare.googleapis.com/v1"

    # TODO(developer): Uncomment these lines and replace with your values.
    # project_id = 'my-project'  # replace with your GCP project ID
    # location = 'us-central1'  # replace with the parent dataset's location
    # dataset_id = 'my-dataset'  # replace with the parent dataset's ID
    # dicom_store_id = 'my-dicom-store' # replace with the DICOM store ID
    # study_uid = '1.3.6.1.4.1.5062.55.1.227'  # replace with the study UID
    url = f"{base_url}/projects/{project_id}/locations/{location}"

    dicomweb_path = "{}/datasets/{}/dicomStores/{}/dicomWeb/studies/{}".format(
        url, dataset_id, dicom_store_id, study_uid
    )

    # When specifying the output file, use an extension like ".multipart."
    # Then, parse the downloaded multipart file to get each individual
    # DICOM file.
    file_name = "study.multipart"

    response = session.get(dicomweb_path)

    response.raise_for_status()

    with open(file_name, "wb") as f:
        f.write(response.content)
        print(f"Retrieved study and saved to {file_name} in current directory")

    return response

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