The reconstruction to the electron dose map in radiation therapy was investigated by constructing the inversion model of electron dose map with different algorithms.The inversion model of electron dose map based on nonlinear programming was used

and this model was applied the penetration dose map to invert the total space one.The realization of this inversion model was by several inversion algorithms.The test results with seven samples show that except the NMinimize algorithm

which worked for just one sample

with great error

though

all the inversion algorithms could be realized to our inversion model rapidly and accurately.The Levenberg-Marquardt algorithm

having the greatest accuracy and speed

could be considered as the first choice in electron dose map inversion.Further tests show that more error would be created when the data close to the electron range was used (tail error).The tail error might be caused by the approximation of mean energy spectra

and this should be considered to improve the method.The time-saving and accurate algorithms could be used to achieve real-time dose map inversion.By selecting the best inversion algorithm

the clinical need in real-time dose verification can be satisfied.