An implantable medical lead, comprising: a body defining an outer jacket; a filar being located within the outer jacket; a proximal contact; and a distal electrode, the filar interconnecting the proximal contact to the distal electrode; characterised by one or more of: the filar including physical changes that establish multiple radio frequency reflection points located along the length of the filar; the filar being surrounded by an inner jacket, the filar and inner jacket being located within the outer jacket, the inner jacket comprising a non-conductive material and including physical changes that establish multiple radio frequency reflection points located along the length of the filar; or the filar being located within the outer jacket such that the outer jacket includes physical changes that establish multiple radio frequency reflection points located along the length of the filar at non-standard intervals of repetition; or discrete circuit elements electrically coupled to the filar that establish multiple radio frequency reflection points located along the length of the filar at non-standard intervals of repetition; the radio frequency reflection points being points along the length at which the physical changes are such to cause a change in characteristic impedance. a body defining an outer jacket; a filar being located within the outer jacket; a proximal contact; and a distal electrode, the filar interconnecting the proximal contact to the distal electrode; characterised by one or more of: the filar including physical changes that establish multiple radio frequency reflection points located along the length of the filar; the filar being surrounded by an inner jacket, the filar and inner jacket being located within the outer jacket, the inner jacket comprising a non-conductive material and including physical changes that establish multiple radio frequency reflection points located along the length of the filar; or the filar being located within the outer jacket such that the outer jacket includes physical changes that establish multiple radio frequency reflection points located along the length of the filar at non-standard intervals of repetition; or discrete circuit elements electrically coupled to the filar that establish multiple radio frequency reflection points located along the length of the filar at non-standard intervals of repetition; the radio frequency reflection points being points along the length at which the physical changes are such to cause a change in characteristic impedance. the filar including physical changes that establish multiple radio frequency reflection points located along the length of the filar; the filar being surrounded by an inner jacket, the filar and inner jacket being located within the outer jacket, the inner jacket comprising a non-conductive material and including physical changes that establish multiple radio frequency reflection points located along the length of the filar; or the filar being located within the outer jacket such that the outer jacket includes physical changes that establish multiple radio frequency reflection points located along the length of the filar at non-standard intervals of repetition; or discrete circuit elements electrically coupled to the filar that establish multiple radio frequency reflection points located along the length of the filar at non-standard intervals of repetition; the radio frequency reflection points being points along the length at which the physical changes are such to cause a change in characteristic impedance.