An adhesive patch for attaching at least one EM probe to a subject's body, the adhesive patch comprising a planar member having at least one layer of radiation absorbing material and having at least one opening formed within the radiation absorbing material to allow the propagation of EM radiation via the opening from one side of the planar member to the other. The adhesive patch further comprises at least one layer of an adhesive attached over at least part of a bottom surface of the planar member, which adhesive layer may be applied so as to form a pattern on the bottom surface, the pattern comprising at least one adhesive-covered portion and at least one adhesive-free portion.
