In this tutorial, we are going to learn how we can update the Dicom image metadata for the Dicom file.
We are using the SimpleITK library for this. SimpleITK library is very handy while working on medical image manipulation, processing, and analysis. Please follow our previous tutorial before starting this tutorial.
Simple Itk Installation for Java Application.
Read the Dicom Image metadata using Java
Let's create a sample java class ModifyMetaData.java. Create a main method that runs the update metadata code.
public static void main(String[] args) {
String dcmImagePath = "input_dicom_image_path/N2D_0001.dcm";
String metaDataKeyToUpdate = "0010|0020"; // Patient Id
String metaDataValueToUpdate = "02L3000";
String outputDcmPath = "output_dicom_image_path/output.dcm";
try {
ImageFileReader imageFileReader = getDcmImageFileReader(dcmImagePath);
Image image = imageFileReader.execute(); // Read image
updateMetaData(image, metaDataKeyToUpdate, metaDataValueToUpdate);
writeImage(image, outputDcmPath);
} catch (Exception e) {
System.out.println("Error due to: " + e.getMessage());
}
}Here, we are defining the input Dicom image path, metadata key to update. The metadata tag must be in the format of 0010|0020. Metadata value to update and the output Dicom image path to save the update Dicom image.
First, we are reading the Dicom image then we are updating the image with the tag value for the tag. Here we are using the patient Id tag to update. Please visit the Dicom library for the universal Dicom tag and its description.
Let's implement the method used in the main method.
private static ImageFileReader getDcmImageFileReader(String imagePath) {
ImageFileReader imageFileReader = new ImageFileReader();
imageFileReader.setImageIO("GDCMImageIO");
imageFileReader.setFileName(imagePath);
return imageFileReader;
}This method reads the Dicom image using the SimpleItk library.
private static void updateMetaData(Image image, String metaDataKey, String metaDataValue) {
image.setMetaData(metaDataKey, metaDataValue);
}Here, we are simply updating the patient id provided with the value
private static void writeImage(Image image, String outputImagePath) {
SimpleITK.writeImage(image, outputImagePath);
}Here, we are writing the updated Dicom image to the output file path. If we verify the file then the Dicom image, the Patient Id value is changed.
The overall code implementation looks as below:
package simpleitk;
import org.itk.simple.Image;
import org.itk.simple.ImageFileReader;
import org.itk.simple.SimpleITK;
public class ModifyMetaData {
public static void main(String[] args) {
String dcmImagePath = "input_dicom_image_path/N2D_0001.dcm";
String metaDataKeyToUpdate = "0010|0020"; // Patient Id
String metaDataValueToUpdate = "02L3000";
String outputDcmPath = "output_dicom_image_path/output.dcm";
try {
ImageFileReader imageFileReader = getDcmImageFileReader(dcmImagePath);
Image image = imageFileReader.execute(); // Read image
updateMetaData(image, metaDataKeyToUpdate, metaDataValueToUpdate);
writeImage(image, outputDcmPath);
} catch (Exception e) {
System.out.println("Error due to: " + e.getMessage());
}
}
private static ImageFileReader getDcmImageFileReader(String imagePath) {
ImageFileReader imageFileReader = new ImageFileReader();
imageFileReader.setImageIO("GDCMImageIO");
imageFileReader.setFileName(imagePath);
return imageFileReader;
}
private static void updateMetaData(Image image, String metaDataKey, String metaDataValue) {
image.setMetaData(metaDataKey, metaDataValue);
}
private static void writeImage(Image image, String outputImagePath) {
SimpleITK.writeImage(image, outputImagePath);
}
}
