Siemens Healthcare GmbH (Erlangen, DE)

Pilot tone devices that is used for gathering physiological information of patients and magnetic resonance tomography systems with a corresponding pilot tone device are offered. A pilot tone transmitter comes in the device for piloting. It is capable of transmitting a pilot tone in an ISM band.

The present embodiments are the pilot tone device that includes a pilot tone transmitter and a pilot tone receiver.

Pilot tone devices transmit an electromagnetic alternating field which is weak and interacts with the body of the patient through damping, reflection, or interference. The frequency and/or the intensity of the signal are changed. There is a time variation that occurs when there are movements within the body of a patient. Therefore, internal movement as a result of breathing, heartbeat, or digestion may also be acquired without putting strain on the body due to sensors in the body or attached to the skin.

Magnetic resonance imaging systems utilize magnetic resonance imaging to create images of objects. They align the nuclear spins on an object using an external magnetic field then apply an rotating magnetic force to cause them to move around the aligned. The precession or the return of the spins that are excited from this state into a state with less energy, in turn, generates, as a response an oscillating magnetic field which is received via antennas.

Utilizing magnetic gradient fields A spatial encoding is applied to the signals that allows for the assigning of the signal received to a volume element. The received signal is then evaluated, and a three-dimensional imagingrepresentation of the object under examination is provided.

The sequence (or pulse sequence) The time required to create an image with a magnetic resonance imaging system could range from a few milliseconds to several minutes. A longer time to acquire can result in minimal noiseartifacts. To avoid motion artifacts caused by motion during image acquisition the image acquisition can be started in every case at a particular phase. For instance, unavoidable movements include breathing and heartbeat. A time of relative rest like when you breathe out or contraction of the heart muscle, is a part of a time that involves movements. This allows imaging over a lengthy period of time with only a only a few movements, which is necessary to get the best possible measurement results.

It is well-known that mechanical sensors and electrodes can be used to gauge the potential for excitation of muscles.

The radio frequency signal can be used to detect movement. This is explained in the paper DE 10 2015203 385. For example, the signal can be permanently recorded in a magnetic resonance imaging system patient recording. Changes in signal due to movement (e.g. due to of shifting interferences and damping) are then evaluated. A movement of the patient that is caused by breathing or heartbeats, could then be identified from certain patterns of the signal.

The publication WO 2015/150953 A1 provides a transmitter to emit a synchronization signal, the two antennas are placed at the end of a patient’s leadthrough. A pilot tone may also be emitted as, for example, a synchronizationsignal.

The publication DE 10 2015 224 158 describes a transmitter for pilot tone navigation in a magnetic resonance tomography system, and a method of tracking the movement of the patient. The transmitter has a power supply and an antenna. It is built to transmit a pilot signal via the antenna. The transmitter also has an element for decoupling in order to shield the power of the transmitter from signals that the antenna receives during magnetic resonance imaging in excitationpulses of the magnetic resonance tomography system. The method employs movement-dependent changes to the pilot tone signal of the transmitter are identified by a control unit of the magnetic resonance imaging system.

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