Abstract: A head coil apparatus for MRI of a person's head includes a transmit coil array device generating RF fields for spin state excitation to the head, wherein the transmit coil array device comprises multiple transmit coil loops decoupled from each other and arranged on a transmit coil array carrier surrounding an inner head coil space for receiving the head; a receive coil array device for receiving RF resonance signals from the head; a RF shield surrounding the transmit coil array device and the receive coil array device; and a head coil window providing a viewing port through the RF shield and transmit coil array device. The head coil window has a longitudinal extension and an azimuthal extension, the transmit coil loops includes a window coil loop surrounding the head coil window, and the coil loop is decoupled from a neighbouring transmit coil loop by sharing a common loop conductor.

Abstract: A head coil apparatus for MRI of a person's head includes a transmit coil array device generating RF fields for spin state excitation to the head, wherein the transmit coil array device comprises multiple transmit coil loops decoupled from each other and arranged on a transmit coil array carrier surrounding an inner head coil space for receiving the head; a receive coil array device for receiving RF resonance signals from the head; a RF shield surrounding the transmit coil array device and the receive coil array device; and a head coil window providing a viewing port through the RF shield and transmit coil array device. The head coil window has a longitudinal extension and an azimuthal extension, the transmit coil loops includes a window coil loop surrounding the head coil window, and the coil loop is decoupled from a neighbouring transmit coil loop by sharing a common loop conductor.

Abstract: The invention relates to an MRI apparatus for magnetic resonance imaging of a subject of investigation, comprising: a coil arrangement (1) for transmitting an excitation signal into the subject and for receiving a response signal from the subject; a high-power radio-frequency amplifier (4) for generating the excitation signal; and a low-noise amplifier (LNA) for amplifying the response signal. The invention provides a transmit/receive switch (5) which is alternatively operable in a transmit mode or in a receive mode. In the transmit mode, the transmit/receive switch (5) transmits the excitation signal to the coil arrangement (1) and protects the low-noise amplifier (LNA) from the outgoing excitation signal. In the receive mode, the transmit/receive switch (5) routes the in coming response signal to the low-noise amplifier (LNA).

Abstract: The invention relates to an MRI apparatus for magnetic resonance imaging of a subject of investigation, comprising: a coil arrangement (1) for transmitting an excitation signal into the subject and for receiving a response signal from the subject; a high-power radio-frequency amplifier (4) for generating the excitation signal; and a low-noise amplifier (LNA) for amplifying the response signal. The invention provides a transmit/receive switch (5) which is alternatively operable in a transmit mode or in a receive mode. In the transmit mode, the transmit/receive switch (5) transmits the excitation signal to the coil arrangement (1) and protects the low-noise amplifier (LNA) from the outgoing excitation signal. In the receive mode, the transmit/receive switch (5) routes the in coming response signal to the low-noise amplifier (LNA).

Abstract: The present invention aims to provide an RF coil assembly capable of eliminating the need for connecting and disconnecting an electric path at decoupling portions and is an RF coil assembly including: a plurality of coil loops that are adjacent to each other in sequence and construct a phased array; and a plurality of decoupling device that cancel electromagnetic coupling between adjacent coil loops, respectively, wherein at least two of the plurality of coil loops are two coil loops that are adjacent to each other across a boundary where they can be decoupled from each other, and wherein at least one of the plurality of decoupling device is two coils that are connected in series to the two coil loops, respectively, and are opposed to each other across the boundary and form a pair of coils for decoupling.

Abstract: The present invention aims to provide an RF coil assembly capable of eliminating the need for connecting and disconnecting an electric path at decoupling portions and is an RF coil assembly including: a plurality of coil loops that are adjacent to each other in sequence and construct a phased array; and a plurality of decoupling device that cancel electromagnetic coupling between adjacent coil loops, respectively, wherein at least two of the plurality of coil loops are two coil loops that are adjacent to each other across a boundary where they can be decoupled from each other, and wherein at least one of the plurality of decoupling device is two coils that are connected in series to the two coil loops, respectively, and are opposed to each other across the boundary and form a pair of coils for decoupling.