diff --git a/src/MagneticFieldCoefficients.jl b/src/MagneticFieldCoefficients.jl
index aaa03fc..ae490b3 100644
--- a/src/MagneticFieldCoefficients.jl
+++ b/src/MagneticFieldCoefficients.jl
@@ -132,10 +132,9 @@ end
 # TODO: This should be merged with and moved to MPIFiles
 function calcTDesignCoefficients(filename::String)
     # load the measurement data
-    field, radius, N, t, center, correction = loadMagneticFieldMeasurementData(filename)
+    field, tDes, correction = loadMagneticFieldMeasurementData(filename)
 
     # calculate the coefficients
-    tDes = MPIFiles.loadTDesign(Int(t), N, radius * u"m", center .* u"m")
     coeffs = magneticField(tDes, field)
 
     # apply the correction of the sensors
@@ -143,7 +142,7 @@ function calcTDesignCoefficients(filename::String)
         coeffs[j, c] = SphericalHarmonicExpansions.translation(coeffs[j, c], correction[:, j])
     end
 
-    coeffs_MF = MagneticFieldCoefficients(coeffs, radius, zeros(size(coeffs)))
+    coeffs_MF = MagneticFieldCoefficients(coeffs, ustrip(tDes.radius), zeros(size(coeffs)))
 
     return coeffs_MF
 end
diff --git a/src/utils.jl b/src/utils.jl
index 3a9bd14..9f47dc3 100644
--- a/src/utils.jl
+++ b/src/utils.jl
@@ -26,6 +26,14 @@ function loadMagneticFieldMeasurementData(filename::String)
     t = tDes["t"]
     center = tDes["center"]
 
+  # load spherical t-design
+  tDes = MPIFiles.loadTDesign(Int(t), N, radius * u"m", center .* u"m")
+  # if measurementData contains positions, use them as t-design positions
+  if haskey(measurementData["positions"]["tDesign"], "positions")
+    tDes.positions = measurementData["positions"]["tDesign"]["positions"]
+  end
+
+  # get optional data
   if haskey(measurementData, "sensor")
     correction =  measurementData["sensor"]["correctionTranslation"]
   else
@@ -33,7 +41,7 @@ function loadMagneticFieldMeasurementData(filename::String)
     @warn "No correction of the sensor translations found."
   end
 
-  return field, radius, N, t, center, correction
+  return field, tDes, correction
 end
 
 """
@@ -57,6 +65,9 @@ function loadMagneticFieldMeasurementDataV2(filename::String)
       tDes["N"] = read(file, "/positions/tDesign/N")           # number of points of the t-design
       tDes["t"] = Int(read(file, "/positions/tDesign/t"))           # t of the t-design
       tDes["center"] = read(file, "/positions/tDesign/center") # center of the measured ball
+      if haskey(file,"positions/tDesign/positions") # optional data
+        tDes["positions"] = read(file, "/positions/tDesign/positions") # measured positions (shifted and scaled t-design)
+      end
     
     # sensor
     measurementData["sensor"] = Dict{String, Any}()
diff --git a/test/testWriteLoad.jl b/test/testWriteLoad.jl
index ca614fb..6edfae0 100644
--- a/test/testWriteLoad.jl
+++ b/test/testWriteLoad.jl
@@ -8,6 +8,7 @@
   # write data (v2)
   h5open(filename, "w") do file
       write(file,"/fields", fieldValues) 		# measured field (size: 3 x #points x #patches)
+      write(file,"/positions/tDesign/positions", tDes.positions) # measured positions (on the unit-sphere)
       write(file,"/positions/tDesign/radius", ustrip(u"m", tDes.radius))	# radius of the measured ball
       write(file,"/positions/tDesign/N", size(tDes.positions,2))		# number of points of the t-design
       write(file,"/positions/tDesign/t", tDes.T)		# t of the t-design