A computer-implemented method for provision of a result dataset having position information of a local radio-frequency coil, including: providing input data having at least magnetic resonance data, which is acquired by means of the local radio-frequency coil; determining a result dataset by applying a trained function to the input data, wherein the result dataset comprises position information for determining the position of the local radio-frequency coil; and providing the result dataset.

An imaging target site of a subject can be automatically aligned with imaging space, without using additional hardware. A nuclear magnetic resonance signal received by a receiver coil arranged at the imaging target site of the subject is used to calculate a position of the receiver coil. A table on which the subject is placed is moved in a manner to align the position of the receiver coil with the imaging space of the magnetic resonance imaging apparatus. With this configuration, the imaging target site of the subject can be aligned with the imaging space of the magnetic resonance imaging apparatus.

The disclosure relates to a method, a computer program, a data storage medium, a system, and a local-coil apparatus for a magnetic resonance tomography MRT unit having at least one receive coil configured to receive an MRT signal and a receive amplifier apparatus having at least one output amplifier unit and configured to amplify the received MRT signal in order to drive an analog-to-digital converter ADC. The at least one output amplifier unit is configured to amplify the MRT signal, below a signal-level threshold value, by a high gain, and, above the signal-level threshold value, by a low gain. The receive amplifier apparatus is configured to change a bias current of the at least one output amplifier unit according to a defined MRT signal level.

The disclosure relates to techniques for adjusting at least one measurement parameter for a measurement protocol for a magnetic resonance examination. The techniques include providing at least one item of parameter information for adjusting a value of the at least one measurement parameter, wherein the at least one item of parameter information is provided independently of coil information for the magnetic resonance examination, and selecting a value of the at least one measurement parameter. The techniques further include transmitting the selected value to a protocol adjusting unit connected to the scanner unit of the magnetic resonance apparatus, providing coil information of the scanner unit, and automatically adjusting the value of the at least one measurement parameter based on the coil information provided.

A magnetic resonance (MR) imaging system includes a transmit radio frequency (RF) coil assembly comprising multiple capacitor banks each coupled to at least one diode that is characterized by a high breakdown voltage such that when the transmit RF coil assembly applies at least one slice-selecting RF pulse to a portion of a subject placed in the magnet to select a particular slice for MR imaging, the capacitor banks are selectively adjusted to improve an RF transmission characteristics of the RF coil assembly in transmitting the at least one slice-selecting RF pulse. The MR imaging system may further include a receive radio frequency (RF) coil assembly configured to, in response to at least the slice-selecting RF pulse, receive at least one response radio frequency (RF) pulse emitted from the selected slice of the portion of the subject; a housing; a main magnet; gradient coils; and a control unit.

The present invention is directed to a system comprising a body coil (9) for magnetic resonance imaging and an RF amplifier connected to the body coil (9) for feeding the body coil (9) with an RF signal, wherein the body coil (9) comprises two different ports (21, 22) for feeding the RF signal into the body coil (9), the body coil (9) is provided with a switch for selectively activating only one single port (21, 22) for feeding the RF signal to the body coil (9) at a time, and the two ports (21, 22) are located at different locations of the body coil (9) such that the dependence of the reflected part of the RF signal fed into the body coil (9) from the weight of the examination object (1) to which the body coil (9) is applied is different for the two ports (21, 22). In this way, a possibility for adapting a MRI measurement to different load situations due to different weights of an examination object (1) in an easy and efficient way is provided, thereby providing the possibility for impedance matching of the body coil by selecting the appropriate driven port.

A magnetic resonance tomograph and a method for operating a magnetic resonance tomograph. In a transmitting state of the magnetic resonance tomograph nuclear spins are excited in an object under examination with an excitation pulse by a high-frequency unit of the magnetic resonance tomograph via a transmitting antenna. The magnetic resonance tomograph is switched over from the transmitting state to a receiving state in a period of less than 40 microseconds. In a further step, in the receiving state, a magnetic resonance signal is received with a receiving antenna.

The present invention provides a passive radio frequency (RF) shim resonator (144) for field homogenization of an RF field emitted by an RF antenna device (140) of a magnetic resonance (MR) imaging system (110), whereby the passive RF shim resonator (144) has a first resonating capability and a second resonating capability, and the passive RF shim resonator (144) comprises a switching device, whereby the switching device is adapted to switch between the first and the second resonating capability in accordance with a TX-mode and a RX-mode of the RF field emitted by the RF antenna device (140) of the MR imaging system (110). The present invention further provides a patient bed (142) or a patient mattress for use in a magnetic resonance imaging (MRI) system (110), whereby the patient bed (142) or the patient mattress comprises an above passive RF shim resonator (144). The present invention further provides a RF antenna device for generating and/or receiving a RF field for use in a MRI system (110), whereby the RF antenna device (140) comprises a coil housing and an above passive RF shim resonator (144), wherein the passive RF shim resonator (144) is located within the coil housing. The present invention also provides a magnetic resonance (MR) imaging system (110), comprising an above patient bed (142) or patient mattress or at least one above RF antenna device (140).

According to one embodiment, the MRI apparatus includes an RF coil apparatus having a coil element, a coil port to which the RF coil apparatus is connectible, receive circuitry receiving a signal detected by the RF coil apparatus via the coil port when neither an RF pulse nor a gradient magnetic field is being applied, and performing A/D conversion with an A/D converter, and processing circuitry detecting an abnormality based on the signal. With the RF coil apparatus being connected to the coil port, the receive circuitry switches at least one switch provided in a section between the coil element and the A/D converter between on and off, and receives the signal. The processing circuitry compares a signal of a path where the coil element and A/D converter are connected with a signal of a path where the coil element and A/D converter are not connected, and detects the abnormality.

An embodiment of the present invention provides a scanning control system for a magnetic resonance imaging system, comprising: a first 3D camera, configured to capture a three-dimensional image of a scan subject located on a scanning table of the magnetic resonance imaging system; a processing device, configured to identify body position information of the scan subject based on the three-dimensional image; and a control device, configured to set scanning parameters related to a body position based on the body position information.