Patent ID: 7945308

Claim:
An apparatus to receive radio frequency signals characteristic of a targeted specimen within a patient, the apparatus comprising: a housing designed to be inserted into a patient; and at least two radio frequency receiver coils, each of which (i) is positioned inside the housing, (ii) has an operating radio frequency, and (iii) includes: a first circuit proximal to the radio frequency receiver coil operable to block an external transmitter only during a transmit cycle at an operating radio frequency of the circuit and a second circuit operable to provide a passive block at the operating radio frequency of other ones of the radio frequency coils; wherein each circuit is operable to seek only a single frequency, wherein the radio frequency receiver coils are superimposed upon each other, wherein the first circuit and the second circuit respectively associated with each of the at least two radio frequency receiver coils provide at least two active traps and two passive traps, wherein the radio frequency signals received by the at least two receiver coils are generated by different target nuclei associated with the specimen.