code: def get_acq_mat_txt(csa_dict):
      return get_scalar(csa_dict, "AcquisitionMatrixText")
  
file_path: nibabel/nibabel/nicom/csareader.py
imports: import numpy
  from .structreader import Unpacker
  from .utils import find_private_section
label_desc: Use image node_id 7 for calling a global function with example usage: get_acq_mat_txt(csa_dict) and returns: get_scalar