Get/Set attributes from an object
Attributes (patient name, exam date, acquisition parameters, etc.) in DICOM objects are encoded as data elements. Manipulation of data elements is performed using class
DataSet. When a DICOM object is read by the plugin, its associated stream metadata, an instance of
DicomMetadata, can be used to get or set various information about the object, one being the full data set.
DicomReader reader = new DicomReader(); reader.setInput(new FileImageInputStream(new File("image.dcm"))); DicomMetadata dmd = reader.getDicomMetadata(); DataSet ds = dmd.getDataSet(); String patient_id = ds.getString(Tag.PatientID); LocalDate date = ds.getLocalDate(Tag.StudyDate); BufferedImage image = reader.read(0); ds.set(Tag.PatientName, "Anonymized");
DicomReader is a subclass of the standard
ImageReader. Instances can be created directly like in the example, or using the ImageIO service provider mechanism and asking for an image reader providing the
getDicomMetadata() is just a shortcut for
Tag is a dictionary class containing the numeric tags of all DICOM attributes, using the standard keywords introduced in DICOM 2009.
The value of a data element is set and get using a Java class reflecting the data element type (its DICOM Value Representation), but this restriction is loose: any element value can be read as string using
getString, person names can be set with strings or with instances of specific class
PersonName which can handle multi-component names, numbers are automatically converted if necessary, and so on.