A medical device comprising: an elongate core member having a distal portion configured to be intravascularly positioned at a treatment site within a blood vessel lumen; and an interventional element coupled to the distal portion of the core member , the interventional element comprising: a body that is expandable from a first configuration to a second configuration; a first radiopaque element coupled to the body within a working length of the body , the first radiopaque element comprising an electrically conductive material and; and a second radiopaque element coupled to the body within a non-working length of the body , the second radiopaque element comprising an electrically conductive material, a first electrically conductive lead having a distal portion electrically coupled to the first radiopaque element and a proximal portion configured to be electrically coupled to a current source to configure the first radiopaque element as a delivery electrode ; and a second electrically conductive lead having a distal portion electrically coupled to the second radiopaque element and a proximal portion configured to be electrically coupled to the current source to configure the second radiopaque element as a return electrode . an elongate core member having a distal portion configured to be intravascularly positioned at a treatment site within a blood vessel lumen; and an interventional element coupled to the distal portion of the core member , the interventional element comprising: a body that is expandable from a first configuration to a second configuration; a first radiopaque element coupled to the body within a working length of the body , the first radiopaque element comprising an electrically conductive material and; and a second radiopaque element coupled to the body within a non-working length of the body , the second radiopaque element comprising an electrically conductive material, a first electrically conductive lead having a distal portion electrically coupled to the first radiopaque element and a proximal portion configured to be electrically coupled to a current source to configure the first radiopaque element as a delivery electrode ; and a second electrically conductive lead having a distal portion electrically coupled to the second radiopaque element and a proximal portion configured to be electrically coupled to the current source to configure the second radiopaque element as a return electrode . a body that is expandable from a first configuration to a second configuration; a first radiopaque element coupled to the body within a working length of the body , the first radiopaque element comprising an electrically conductive material and; and a second radiopaque element coupled to the body within a non-working length of the body , the second radiopaque element comprising an electrically conductive material, a first electrically conductive lead having a distal portion electrically coupled to the first radiopaque element and a proximal portion configured to be electrically coupled to a current source to configure the first radiopaque element as a delivery electrode ; and a second electrically conductive lead having a distal portion electrically coupled to the second radiopaque element and a proximal portion configured to be electrically coupled to the current source to configure the second radiopaque element as a return electrode . <EOS>