patlak_analysis
==========================================================

.. py:function:: petpal.kinetic_modeling.graphical_analysis.patlak_analysis(tac_times_in_minutes: numpy.ndarray, input_tac_values: numpy.ndarray, region_tac_values: numpy.ndarray, t_thresh_in_minutes: float) -> numpy.ndarray

   Performs Patlak analysis given the input TAC, region TAC, times and threshold.

   :param tac_times_in_minutes: Array of times in minutes.
   :type tac_times_in_minutes: np.ndarray
   :param input_tac_values: Array of input TAC values
   :type input_tac_values: np.ndarray
   :param region_tac_values: Array of ROI TAC values
   :type region_tac_values: np.ndarray
   :param t_thresh_in_minutes: Threshold time in minutes. Line is fit for all values
                               after the threshold.
   :type t_thresh_in_minutes: np.ndarray

   :returns: *(np.ndarray)* -- Array containing :math:`(K_{i}, V_{0})` values.

   .. important::
       * We assume that the input TAC and ROI TAC values are sampled at the same times.