from src.wrappers.OsipiBase import OsipiBase
from src.original.PvH_KB_NKI.DWI_functions_standalone import generate_IVIMmaps_standalone, generate_ADC_standalone
import numpy as np
[docs]
class PvH_KB_NKI_IVIMfit(OsipiBase):
"""
Bi-exponential fitting algorithm by Petra van Houdt and Koen Baas, NKI
"""
# I'm thinking that we define default attributes for each submission like this
# And in __init__, we can call the OsipiBase control functions to check whether
# the user inputs fulfil the requirements
# Some basic stuff that identifies the algorithm
id_author = "Group Uulke van der Heide, NKI"
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 = False # Bounds may not be required but are optional
required_initial_guess = False
required_initial_guess_optional =False
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):
"""
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(PvH_KB_NKI_IVIMfit, self).__init__(bvalues, thresholds,bounds,initial_guess)
self.NKI_algorithm = generate_IVIMmaps_standalone
[docs]
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_
"""
#bvalues = np.array(bvalues)
bvalues = bvalues.tolist() #NKI code expects a list instead of nparray
# reshape signal as the NKI code expects a 4D array
signals = np.reshape(signals, (1, 1, 1, len(signals))) # assuming that in this test the signals are always single voxel
fit_results = self.NKI_algorithm(signals,bvalues)
D = fit_results[0][0,0,0]/1000
f = fit_results[1][0,0,0]
Dstar = fit_results[2][0,0,0]/1000
return f, Dstar, D