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A semi-analytical approach for rapid calculation of the Green's function inside a cavity of irregular shape over a broad range of frequency is presented. The method is based on the extraction of the Green's function at an imaginary wave number from itself to obtain a rapidly convergent hybrid spatial-spectral expansion of the Green's function. The method is applied to a V-grooved cavity, and the results are compared with the integral equation method.A direct scattering optical coherence tomography forward model was developed to simulate A-