Note

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# Working with sequences

This examples illustrates how to work with sequences.

Out:

    Number of blocks: [(300a, 00f8) Block Type                          CS: 'APERTURE'
    (300a, 00fe) Block Name                          LO: 'Block1'(300a, 00f8) Block Type                          CS: 'APERTURE'
    (300a, 00fe) Block Name                          LO: 'Block2']

    from pydicom.sequence import Sequence
    from pydicom.dataset import Dataset

    # create to toy datasets
    block_ds1 = Dataset()
    block_ds1.BlockType = "APERTURE"
    block_ds1.BlockName = "Block1"

    block_ds2 = Dataset()
    block_ds2.BlockType = "APERTURE"
    block_ds2.BlockName = "Block2"

    beam = Dataset()
    # note that you should add beam data elements like BeamName, etc; these are
    # skipped in this example
    plan_ds = Dataset()
    # starting from scratch since we did not read a file
    plan_ds.BeamSequence = Sequence([beam])
    plan_ds.BeamSequence[0].BlockSequence = Sequence([block_ds1, block_ds2])
    plan_ds.BeamSequence[0].NumberOfBlocks = 2

    beam0 = plan_ds.BeamSequence[0]
    print('Number of blocks: {}'.format(beam0.BlockSequence))

    # create a new data set
    block_ds3 = Dataset()
    # add data elements to it as above and don't forget to update Number of Blocks
    # data element
    beam0.BlockSequence.append(block_ds3)
    del plan_ds.BeamSequence[0].BlockSequence[1]

Total running time of the script: ( 0 minutes 0.001 seconds)

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