def METHOD_NAME(self) -> np.ndarray:
    detector_positions = self.get_detector_element_positions_base_mm()
    detector_orientations = np.subtract(0, detector_positions)
    norm = np.linalg.norm(detector_orientations, axis=-1)
    for dim in range(3):
        detector_orientations[:, dim] = detector_orientations[:, dim] / norm
    return detector_orientations