Testing Pauliens code

Author: IvanARashid

src/original/PV_MUMC/two_step_IVIM_fit.py

@@ -7,36 +7,34 @@
 numpy
 tqdm
 scipy
-joblib
 """
 
 # load relevant libraries
-from scipy.optimize import curve_fit, nnls
+from scipy.optimize import curve_fit
 import numpy as np
-from joblib import Parallel, delayed
 import tqdm
 
 
 
 
 def two_exp_noS0(bvalues, Dpar, Fmv, Dmv):
-    """ tri-exponential IVIM function, and S0 set to 1"""
+    """ bi-exponential IVIM function, and S0 set to 1"""
     return Fmv * np.exp(-bvalues * Dmv) + (1 - Fmv ) * np.exp(-bvalues * Dpar)
 
 def two_exp(bvalues, S0, Dpar, Fmv, Dmv):
-    """ tri-exponential IVIM function"""
+    """ bi-exponential IVIM function"""
     return S0 * (Fmv * np.exp(-bvalues * Dmv) + (1 - Fmv ) * np.exp(-bvalues * Dpar))
 
 
 
-def fit_least_squares_array(bvalues, dw_data, fitS0=True, bounds=([0.9, 0.0001, 0.0, 0.0025], [1.1, 0.0025, 0.2, 0.2]), cutoff=200):
+def fit_least_squares_array(bvalues, dw_data, fitS0=False, bounds=([0.9, 0.0001, 0.0, 0.0025], [1.1, 0.0025, 0.5, 0.2]), cutoff=200):
     """
     This is the LSQ implementation, in which we first estimate Dpar using a curve fit to b-values>=cutoff;
     Second, we fit the other parameters using all b-values, while fixing Dpar from step 1. This fit
     is done on an array.
     :param bvalues: 1D Array with the b-values
     :param dw_data: 2D Array with diffusion-weighted signal in different voxels at different b-values
-    :param bounds: Array with fit bounds ([S0min, Dparmin, Fintmin, Dintmin, Fmvmin, Dmvmin],[S0max, Dparmax, Fintmax, Dintmax, Fmvmax, Dmvmax]). default: ([0.9, 0.0001, 0.0, 0.0015, 0.0, 0.004], [1.1, 0.0015, 0.4, 0.004, 0.2, 0.2])
+    :param bounds: Array with fit bounds ([S0min, Dparmin, Fmvmin, Dmvmin],[S0max, Dparmax, Fmvmax, Dmvmax]). 
     :param cutoff: cutoff b-value used in step 1 
     :return Dpar: 1D Array with Dpar in each voxel
     :return Fmv: 1D Array with Fmv in each voxel
@@ -54,69 +52,56 @@ def fit_least_squares_array(bvalues, dw_data, fitS0=True, bounds=([0.9, 0.0001,
     return [Dpar, Fmv, Dmv, S0]
 
 
-def fit_least_squares(bvalues, dw_data, IR=False, S0_output=False, fitS0=True,
-                      bounds=([0.9, 0.0001, 0.0, 0.0025], [1.1, 0.0025, 0.2, 0.2]), cutoff=200):
+def fit_least_squares(bvalues, dw_data, S0_output=False, fitS0=False,
+                      bounds=([0.9, 0.0001, 0.0, 0.0025], [1.1, 0.003, 1, 0.2]), cutoff=200):
     """
    This is the LSQ implementation, in which we first estimate Dpar using a curve fit to b-values>=cutoff;
    Second, we fit the other parameters using all b-values, while fixing Dpar from step 1. This fit
    is done on an array. It fits a single curve
     :param bvalues: 1D Array with the b-values
     :param dw_data: 1D Array with diffusion-weighted signal in different voxels at different b-values
-    :param IR: Boolean; True will fit the IVIM accounting for inversion recovery, False will fit IVIM without IR; default = True
-    :param S0_output: Boolean determining whether to output (often a dummy) variable S0; default = False
-    :param fix_S0: Boolean determining whether to fix S0 to 1; default = True
-    :param bounds: Array with fit bounds ([S0min, Dparmin, Fintmin, Dintmin, Fmvmin, Dmvmin],[S0max, Dparmax, Fintmax, Dintmax, Fmvmax, Dmvmax]). Default: ([0, 0, 0, 0.005, 0, 0.06], [2.5, 0.005, 1, 0.06, 1, 0.5])
+    :param S0_output: Boolean determining whether to output (often a dummy) variable S0; 
+    :param fitS0: Boolean determining whether to fix S0 to 1;
+    :param bounds: Array with fit bounds ([S0min, Dparmin, Fmvmin, Dmvmin],[S0max, Dparmax, Fmvmax, Dmvmax]). 
     :param cutoff: cutoff b-value used in step 1 
     :return S0: optional 1D Array with S0 in each voxel
     :return Dpar: scalar with Dpar of the specific voxel
-    :return Fint: scalar with Fint of the specific voxel
-    :return Dint: scalar with Dint of the specific voxel
     :return Fmv: scalar with Fmv of the specific voxel
     :return Dmv: scalar with Dmv of the specific voxel
     """
 
     #try:
-    def monofit(bvalues, Dpar):
-            return np.exp(-bvalues * Dpar)
+    def monofit(bvalues, Dpar, Fmv):
+            return (1-Fmv)*np.exp(-bvalues * Dpar)
 
     high_b = bvalues[bvalues >= cutoff]
     high_dw_data = dw_data[bvalues >= cutoff]
-    boundspar = ([bounds[0][1]], [bounds[1][1]])
-    params, _ = curve_fit(monofit, high_b, high_dw_data, p0=[(bounds[1][1]-bounds[0][1])/2], bounds=boundspar)
-    Dpar = params[0]
-
+    boundsmonoexp = ([bounds[0][1], bounds[0][2]], [bounds[1][1], bounds[1][2]])
+    params, _ = curve_fit(monofit, high_b, high_dw_data, p0=[(bounds[1][1]-bounds[0][1])/2,(bounds[1][2]-bounds[0][2])/2], bounds=boundsmonoexp)
+    Dpar1 = params[0]
     if not fitS0:
-        boundsupdated=([Dpar1 , bounds[0][2] , bounds[0][3] ],
-                    [Dpar1 , bounds[1][2] , bounds[1][3] ])    
-        params, _ = curve_fit(two_exp_noS0, bvalues, dw_data, p0=[Dpar1, (bounds[0][2]+bounds[1][2])/2, (bounds[0][3]+bounds[1][3])/2], bounds=boundsupdated)
-        Dpar1, Fmv, Dmv = params[0], params[1], params[2]
+        boundsupdated=([bounds[0][2] , bounds[0][3] ],
+                    [bounds[1][2] , bounds[1][3] ])    
+        params, _ = curve_fit(lambda b, Fmv, Dmv: two_exp_noS0(b, Dpar1, Fmv, Dmv), bvalues, dw_data, p0=[(bounds[0][2]+bounds[1][2])/2, (bounds[0][3]+bounds[1][3])/2], bounds=boundsupdated)
+        Fmv, Dmv = params[0], params[1]
         #when the fraction of a compartment equals zero (or very very small), the corresponding diffusivity is non-existing (=NaN)
-        if Fmv < 1e-4:
-            Dmv = float("NaN")
+        #if Fmv < 1e-4:
+        #    Dmv = float("NaN")
 
     else: 
-        #boundsupdated = ([bounds[0][0] , Dpar1 , bounds[0][2] , bounds[0][3] ],
-        #            [bounds[1][0] , Dpar1, bounds[1][2] , bounds[1][3] ])   
-        #params, _ = curve_fit(two_exp, bvalues, dw_data, p0=[1, Dpar1, (bounds[0][2]+bounds[1][2])/2, (bounds[0][3]+bounds[1][3])/2], bounds=boundsupdated)
         boundsupdated = ([bounds[0][0] , bounds[0][2] , bounds[0][3] ],
                     [bounds[1][0] , bounds[1][2] , bounds[1][3] ])   
-        params, _ = curve_fit(lambda bvalues, S0, Fmv, Dmv: two_exp(bvalues, S0, Dpar, Fmv, Dmv), bvalues, dw_data, p0=[1, (bounds[0][2]+bounds[1][2])/2, (bounds[0][3]+bounds[1][3])/2], bounds=boundsupdated)
+        params, _ = curve_fit(lambda b, S0, Fmv, Dmv: two_exp(b, S0, Dpar1, Fmv, Dmv), bvalues, dw_data, p0=[1, (bounds[0][2]+bounds[1][2])/2, (bounds[0][3]+bounds[1][3])/2], bounds=boundsupdated)
         S0 = params[0]
         Fmv, Dmv = params[1] , params[2]
         #when the fraction of a compartment equals zero (or very very small), the corresponding diffusivity is non-existing (=NaN)
-        if Fmv < 1e-4:
-            Dmv = float("NaN")     
+        #if Fmv < 1e-4:
+        #    Dmv = float("NaN")     
 
     if S0_output:
-        return Dpar, Fmv, Dmv, S0
-    else:
-        return Dpar, Fmv, Dmv
-    #except:
-
-    if S0_output:
-        return 0, 0, 0, 0, 0, 0
+        return Dpar1, Fmv, Dmv, S0
     else:
-        return 0, 0, 0, 0, 0
+        return Dpar1, Fmv, Dmv
 
 
 

src/standardized/PV_MUMC_biexp.py

@@ -0,0 +1,56 @@
+import numpy as np
+from src.wrappers.OsipiBase import OsipiBase
+from src.original.PV_MUMC.two_step_IVIM_fit import fit_least_squares_array, fit_least_squares
+
+
+class PV_MUMC_biexp(OsipiBase):
+    """
+    Bi-exponential fitting algorithm by Paulien Voorter, Maastricht University
+    """
+    
+    # Some basic stuff that identifies the algorithm
+    id_author = "Paulien Voorter MUMC"
+    id_algorithm_type = "Bi-exponential fit"
+    id_return_parameters = "f, D*, D"
+    id_units = "seconds per milli metre squared or milliseconds per micro metre squared"
+    
+    # Algorithm requirements
+    required_bvalues = 4
+    required_thresholds = [0,0] # Interval from "at least" to "at most", in case submissions allow a custom number of thresholds
+    required_bounds = False
+    required_bounds_optional = True # Bounds may not be required but are optional
+    required_initial_guess = False
+    required_initial_guess_optional = True
+    accepted_dimensions = 1 # Not sure how to define this for the number of accepted dimensions. Perhaps like the thresholds, at least and at most?
+    
+    def __init__(self, bvalues=None, thresholds=None, bounds=None, initial_guess=None, weighting=None, stats=False):
+        """
+            Everything this algorithm requires should be implemented here.
+            Number of segmentation thresholds, bounds, etc.
+            
+            Our OsipiBase object could contain functions that compare the inputs with
+            the requirements.
+        """
+        super(PV_MUMC_biexp, self).__init__(bvalues, None, bounds, None)
+        self.PV_algorithm = fit_least_squares
+        
+    
+    def ivim_fit(self, signals, bvalues=None):
+        """Perform the IVIM fit
+
+        Args:
+            signals (array-like)
+            bvalues (array-like, optional): b-values for the signals. If None, self.bvalues will be used. Default is None.
+
+        Returns:
+            _type_: _description_
+        """
+        
+            
+        fit_results = self.PV_algorithm(bvalues, signals)
+        
+        f = fit_results[1]
+        Dstar = fit_results[2]
+        D = fit_results[0]
+        
+        return f, Dstar, D