Circuit for active decoupling of transmit coils in nuclear magnetic resonance imaging apparatuses, particularly of the low field type
AssigneeEsaote S.p.A.
InventorVittorio Viti
Life of this patent
Estimating the term…
Abstract
A circuit for active decoupling of transmit coils in Nuclear Magnetic Resonance imaging apparatuses, particularly of the low field type, includes at least one PIN diode (D1), which is connected in series with the conductors of at least one transmit coil (1) and has at least one input (4) for an incoming bias current. The circuit has at least one additional diode (D2) which is a silicon diode connected in antiparallel with the PIN diode (D1).
Claims7
A circuit for active decoupling of transmit coils in Nuclear Magnetic Resonance imaging apparatuses, the circuit comprising:
- at least one PIN diode which is connected in series with conductors of at least one transmit coil and which PIN diode has at least one input for an incoming bias current;
- means for generating and feeding the incoming bias current to the PIN diode to switch the PIN diode to a conductive state at the start of an excitation pulse transmission, and to control a nonconductive state of the PIN diode and a decoupling of the transmit coil from the receiving coil at an end of the excitation pulse transmission in an absence of the bias current;
- and
- said circuit further having a silicon diode connected in antiparallel with the PIN diode.
A circuit for a Nuclear Magnetic Resonance imaging apparatuses, the circuit comprising:
- a transmit coil having a plurality of sections which are electrically separated from each other, the sections being connected in series with each other;
- a plurality of pairs of diodes, each pair including a PIN diode and a silicon diode connected in antiparallel with the PIN diode;
- each pair of diodes is connected in series with and upstream of a respective one of the sections of the transmit coil;
- each of the PIN diodes has at least one input for an incoming bias current;
- and
- means for generating and feeding the incoming bias currents to the PIN diodes to switch the PIN diodes to a conductive state at the start of an excitation pulse transmission, and to control a nonconductive state of the PIN diode and a decoupling of the transmit coil from the receiving coil at an end of the excitation pulse transmission in an absence of the bias current.
Dependencies are inferred from the claim text.