This study presents integrated simulations investigating how externally injected helical waves influence runaway electron distribution evolution and induce anomalous radiation. Utilizing a 0D2V finite element method to solve the relativistic Fokker-Planck equation—incorporating electric field acceleration, collisions, synchrotron damping, quasi-linear diffusion, and avalanche sources—alongside a backward method based on the reciprocity theorem for Electron Cyclotron Emission (ECE) and the SOFT code, the research reveals that helical wave injection scatters runaway electrons, increasing their perpendicular momentum and synchronizing ECE signal growth with the injected wave. While the injection instantaneously forms runaway vortices and enhances synchrotron radiation, the study concludes that wave scattering and radiation damping alone are insufficient to reduce the runaway population, necessitating an additional loss mechanism for high-energy electrons with large pitch angles to explain experimental results. [1] H. S. Xie, H. J. Ma, Y. K. Bai. Fundamental Plasma Physics 10 (2024) 100050. [2] H. Choudhury, A. Battey, C. Paz-Soldan et al. Physical Review Letters, vol. 136, 025101 (2026) [3] Chang Liu, Eero Hirvijoki, Guo-Yong Fu, et al. Physical Review Letters, vol. 120, 265001 (2018) [4] Chang Liu, Lei Shi, Eero Hirvijoki et al. Nucl. Fusion, vol. 58 096030 (2018)