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A critical consideration in the optimal design of magnetically shielded rooms is the manner in which an external magnetic field, which should be shielded, is imposed on a target area. In this paper, we examined the possibility of applying the Bs method (the method of which the magnetic field Bs in the analyzed region is given) to the shielding problem with a measurement-based magnetic field, which includes an irrotational field component as noise, and, therefore, is inconsistent with Maxwell's equations. We show that the Bs method has a well-defined physical meaning for such an irrotational field component. Furthermore, we explain why the convergence and the accuracy of the Bs method are better than those of the A method.