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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def numpy(self):
 """ Grabs image data and converts it to a numpy array """

        # load GDCM's image reading functionality
        image_reader = gdcm.ImageReader()
        image_reader.SetFileName(self.fname)
        if not image_reader.Read():
            raise IOError("Could not read DICOM image")
        pixel_array = self._gdcm_to_numpy(image_reader.GetImage())
        return pixel_array