class_docstr: Wrapper for Enhanced MR Storage SOP Class
  
  Tested with Philips' Enhanced DICOM implementation.
  
  The specification for the Enhanced MR image IOP / SOP began life as `DICOM
  supplement 49 <ftp://medical.nema.org/medical/dicom/final/sup49_ft.pdf>`_,
  but as of 2016 it is part of the standard. In particular see:
  
  * `A.36 Enhanced MR Information Object Definitions
    <http://dicom.nema.org/medical/dicom/current/output/pdf/part03.pdf#sect_A.36>`_;
  * `C.7.6.16 Multi-Frame Functional Groups Module
    <http://dicom.nema.org/medical/dicom/current/output/pdf/part03.pdf#sect_C.7.6.16>`_;
  * `C.7.6.17 Multi-Frame Dimension Module
    <http://dicom.nema.org/medical/dicom/current/output/pdf/part03.pdf#sect_C.7.6.17>`_.
  
  Attributes
  ----------
  is_multiframe : boolean
      Identifies `dcmdata` as multi-frame
  frames : sequence
      A sequence of ``dicom.dataset.Dataset`` objects populated by the
      ``dicom.dataset.Dataset.PerFrameFunctionalGroupsSequence`` attribute
  shared : object
      The first (and only) ``dicom.dataset.Dataset`` object from a
      ``dicom.dataset.Dataset.SharedFunctionalgroupSequence``.
  
  Methods
  -------
  image_shape(self)
  image_orient_patient(self)
  voxel_sizes(self)
  image_position(self)
  series_signature(self)
  get_data(self)
code: def image_position(self):
      try:
          ipp = self.shared.PlanePositionSequence[
              0
          ].ImagePositionPatient
      except AttributeError:
          try:
              ipp = (
                  self.frames[0]
                  .PlanePositionSequence[0]
                  .ImagePositionPatient
              )
          except AttributeError:
              raise WrapperError("Cannot get image position from dicom")
      if ipp is None:
          return None
      return np.array(list(map(float, ipp)))
  
imports: import operator
  import warnings
  import numpy
  from nibabel.optpkg import optional_package
  from ..onetime import auto_attr
  from ..openers import ImageOpener
  from .None import csareader
  from .dwiparams import B2q, nearest_pos_semi_def, q2bg
label_desc: Use image node_id 5 for calling the MultiframeWrapper obj's underlying member method code with example usage: obj.image_position() and returns: np, None