IN-BODY CAVITY COIL FOR MAGNETIC RESONANCE IMAGE PHOTOGRAPHIC DEVICE

PURPOSE:To easily confirm an imaging position and to easily measure a tumor immersed deeply by providing a coil part in a shape, for which a minor axis is orthogonal with a major axis, capacitor to be inserted in series to this coil part and means to execute impedance matching with an output cable. CONSTITUTION:A capacitor 22 and an impedance matching circuit 23 composed of two capacitors, for which capacity is divided, are inserted in series to a rectangular in-body cavity coil 21. For a cable 24 to take out a signal, coaxial cable is used and connected to the intermediate part of the two capacitors constituting the matching circuit 23 and to one edge of a short side in the rectangular in-body cavity coil 21. Then, the matching of the impedance is executed between the in-body cavity coil and cable. A transmitting signal blocking circuit 25 is constituted by parallelly connecting the series circuit of a solenoid coil 26 of the 1/2 impedance and a diode circuit 27, for which two diodes to be operated by a high voltage are reversely parallelly connected, to the capacitor. Thus, wideness can be obtained in a depth direction proportional to the length of the major axis and the area near the coil by the minor axis can be precisely observed.