Added a fluence sample, it is currently under forward-solvers but we could create a separate folder if it would be helpful

Author: lmalenfant

forward-solvers/fluence-of-rho-and-z-two-layer.py

@@ -0,0 +1,102 @@
+# This is an example of python code using VTS to Compute fluence for a two-layer 
+# medium as a function of radial extent and depth at a given set of optical properties 
+#
+# Import PythonNet
+from pythonnet import load
+load('coreclr')
+import clr
+# Import the Operating System so we can access the files for the VTS library
+import os
+file = '../libraries/Vts.dll'
+clr.AddReference(os.path.abspath(file))
+import numpy as np
+import plotly.graph_objects as go
+import plotly.express as px
+from Vts import *
+from Vts.Common import *
+from Vts.Extensions import *
+from Vts.Modeling.Optimizers import *
+from Vts.Modeling.ForwardSolvers import *
+from Vts.SpectralMapping import *
+from Vts.Factories import *
+from Vts.MonteCarlo import *
+from Vts.MonteCarlo.Sources import *
+from Vts.MonteCarlo.Tissues import *
+from Vts.MonteCarlo.Detectors import *
+from Vts.MonteCarlo.Factories import *
+from Vts.MonteCarlo.PhotonData import *
+from Vts.MonteCarlo.PostProcessing import *
+from System import Array, Double, Object, Func, Math
+clr.AddReference("System.Core")
+from System.Linq import Enumerable
+
+solver = TwoLayerSDAForwardSolver()
+solver.SourceConfiguration = SourceConfiguration.Distributed
+topLayerThickness = 5
+opRegions = Array.CreateInstance(IOpticalPropertyRegion, 2)
+opRegions[0] = LayerOpticalPropertyRegion(DoubleRange(0, topLayerThickness, 2), OpticalProperties(0.1, 1, 0.8, 1.4))
+opRegions[1] = LayerOpticalPropertyRegion(DoubleRange(topLayerThickness, Double.PositiveInfinity, 2), OpticalProperties(0.01, 1, 0.8, 1.4))
+# Create the DoubleRange instance
+rhos_range = DoubleRange(0.1, 19.9, 100) # range of s-d separations in mm
+
+# Convert to .NET array
+rho_delta = rhos_range.GetDelta()
+print(rho_delta)
+# Start at 0.1, increment by 0.2, 100 elements
+rhos = 0.1 + rho_delta * np.arange(100)
+print(rhos)
+
+zs_range = DoubleRange(0.1, 19.9, 100) # range of depths in mm
+
+# Convert to .NET array
+zs_delta = zs_range.GetDelta()
+print(zs_delta)
+# Start at 0.1, increment by delta, 100 elements
+zs = 0.1 + zs_delta * np.arange(100)
+print(zs)
+
+arrayOP = Array[Array[IOpticalPropertyRegion]]([opRegions])
+# predict the tissue's fluence(rho, z) for the given optical properties 
+fluenceOfRhoAndZ = solver.FluenceOfRhoAndZ(arrayOP, rhos, zs );
+#print("*********************************** FLUENCE *****************************************")
+#print(list(fluenceOfRhoAndZ))
+
+allRhos = np.concatenate((-rhos[::-1], rhos))
+print("*********************************** RHOS *****************************************")
+print(allRhos.tolist())
+
+# log transform
+log_fluence = [Math.Log(f) for f in fluenceOfRhoAndZ]
+
+size = len(zs)
+# split into rows
+fluenceRowsToPlot = np.array([log_fluence[i:i+size] for i in range(0, len(log_fluence), size)])
+#print("*********************************** FLUENCE ROWS TO PLOT *****************************************")
+#print(fluenceRowsToPlot)
+
+# reverse and concatenate
+allFluenceRowsToPlot = np.concatenate((fluenceRowsToPlot[::-1], fluenceRowsToPlot))
+#print("*********************************** ALL FLUENCE ROWS TO PLOT *****************************************")
+#print(allFluenceRowsToPlot.tolist())
+
+def heatmap(values, x, y, x_label="", y_label="", title=""):
+    """Create a heatmap chart."""
+    # values should be a 2D array-like (list of lists or 2D numpy array)
+    fig = go.Figure(data=go.Heatmap(
+        z=values,
+        x=x,
+        y=y,
+        transpose=True,
+        colorscale='Hot',
+        colorbar=dict(title=title)
+    ))
+    fig.update_layout(
+        title=title,
+        xaxis_title=x_label,
+        yaxis_title=y_label,
+        yaxis_autorange='reversed'
+    )
+    return fig
+
+fluenceChart = heatmap(allFluenceRowsToPlot.tolist(), allRhos.tolist(), list(zs), "ρ [mm]", "z [mm]", "log(Φ(ρ, z) [mm-3])")
+fluenceChart.show(renderer="browser")