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EP-4738648-A1 - METHOD AND SYSTEM FOR WIRELESS CHARGING OF ONE OR MORE DETACHABLE ACCESSORY DEVICES DURING ACQUISITION OF MAGNET RESONANCE IMAGING DATA

EP4738648A1EP 4738648 A1EP4738648 A1EP 4738648A1EP-4738648-A1

Abstract

The invention concerns a method for wireless charging of one or more detachable accessory devices during acquisition of magnet resonance imaging data. The method comprising the following steps: Receiving magnet resonance system data from an MR system; Receiving charging data from a charger of a detachable accessory device comprising at least a charging field of the charger; Determining an influence of the charging field of the charger on magnet resonance imaging data; Charging at least one detachable accessory device during acquisition of magnet resonance imaging data, and reducing the influence of the charging field on the magnet resonance imaging data during charging of the at least one detachable accessory device by using the magnet resonance system data. The invention further concerns an apparatus for wireless charging of one or more detachable accessory devices during acquisition of magnet resonance imaging data.

Inventors

  • WEISS, STEFFEN

Assignees

  • Koninklijke Philips N.V.

Dates

Publication Date
20260506
Application Date
20241031

Claims (15)

  1. A method for wireless charging of one or more detachable accessory devices during acquisition of magnet resonance imaging data, wherein the method comprises the following steps: Receiving magnet resonance system data from an MR system; Receiving charging data from a charger of a detachable accessory device comprising at least a charging field of the charger; Determining an influence of the charging field of the charger on the magnet resonance imaging data; Charging at least one detachable accessory device during acquisition of magnet resonance imaging data, and Reducing the influence of the charging field on the magnet resonance imaging data during charging of at least one detachable accessory device by using the magnet resonance system data.
  2. The method according to claim 1, wherein the influence of the charging field is a harmonic of the charging field of the charger, in particular the n-th harmonic of the charging field; wherein the magnet resonance system data comprises at least an MR receive band of the MR system; wherein the step of determining the influence comprises determining an influence of the charging field of the charger on magnet resonance imaging data in the MR receive band.
  3. The method according to claim 1 or 2, wherein the method further comprises after determining the influence of the charging field on the magnet resonance imaging data, identifying a forbidden transmit band in the charging field of the charger, and wherein the step of reducing the influence of the charging field of the charger comprises avoiding the forbidden transmit band by the charger by modifying a charging field frequency.
  4. The method according to claim 3, the step of avoiding the forbidden transmit band further comprises the steps of Determining the set of harmonics of the charging field, Shifting the charging field frequency and thereby shifting the set of harmonics out of the MR receive band.
  5. The method according to any one of the preceding claims, wherein the magnet resonance system data further comprises at least a magnetic field B0 of the MR system; wherein the influence of the charging field is further a spatially and temporal dependent offset of the magnetic field B0 of the MR system.
  6. The method according to claim 5, further comprising the steps of Determining a spatial dependence and a temporal dependence of the magnetic field B0 of the MR system; wherein the charging data from the charger of the detachable accessory device further comprises at least a position and orientation of the charger with respect to the MR system; Determining a deviating magnetic field B0 of the MR system influenced by the charger, Compensating the determined deviation magnetic field B0 in a signal de-modulation or in reconstruction of the magnetic resonance imaging data.
  7. The method according to any one of the preceding claims, wherein the wireless charging of the at least one detachable accessory device is performed simultaneously with the acquisition of the magnetic resonance imaging data.
  8. The method according to any of the preceding claims, wherein the method further comprises, when charging more than one detachable accessory device, determining for each respective detachable accessory device the influence of the charging field; and reducing for each detachable accessory device the influence of the charging field during charging.
  9. The method according to any of the preceding claims, wherein the method further comprises receiving charging data from a plurality of chargers; determining an influence of each charging field of each of the plurality of chargers on the MR receive band; Charging at least one detachable accessory device in the respective one of the plurality of chargers during magnet resonance imaging, and Reducing the influence of each charging field during charging of the at least one detachable accessory device.
  10. A method for wireless charging of one or more detachable accessory devices during acquisition of magnet resonance imaging data, wherein the method comprises the following steps: Receiving magnet resonance system data from an MR system comprising at least an MR signal reception period and an MR signal non-reception period of an MR sequence of the MR system; Determining one or more non-reception periods in the MR sequence; Charging the one or more detachable accessory device only during non-reception periods of the MR sequence.
  11. An apparatus for wireless charging of one or more detachable accessory devices during acquisition of magnet resonance imaging data, comprising a processor configured to receive magnet resonance system data from an MR system; receive charging data from a charger of a detachable accessory device comprising at least a charging field of the charger; determine an influence of the charging field of the charger on the magnet resonance imaging data; control the charger by providing the information about the influence of the charging field to the charger and to control the charger to reduce the influence of the charging field on the magnet resonance imaging data during charging of the at least one detachable accessory device during acquisition of magnet resonance imaging data by using the magnet resonance system data.
  12. The apparatus according to claim 11, wherein the apparatus is the MR system, wherein the charger is attached to the MR system or in the vicinity of the MR System.
  13. The apparatus according to claim 11 or 12, wherein the processor is configured to control one or more charger which is able to charge one or more detachable accessory devices, wherein the processor is further configured to, for each charger and/or for each detachable accessory device, to determine a respective influence of the charging field on the magnet resonance imaging data in MR receive band.
  14. The apparatus according to any of claims 11 to 13, wherein the charger is a sinus charger providing a sinus-wave output signal.
  15. A computer program comprising instructions, which, when the program is executed by a computer, cause the computer to carry out the method according to any one of the claims 1 to 10.

Description

FIELD OF THE INVENTION The invention relates to the field of charging in the vicinity of magnetic fields, in particular to the field of wireless charging of detachable accessory devices. More specifically, the invention relates to the field of wireless charging of detachable accessory devices near magnetic resonance imaging systems. BACKGROUND OF THE INVENTION A magnetic resonance system may be equipped with one or more different detachable accessory devices (DAD). On the other hand, these detachable accessory devices may be stored near the magnetic resonance system so that they are close by and ready for use. These DAD such as for example, MR coils, user pads as mobile screens and input devices, an ECG detection unit, a respiratory sensor should be stored near or at and moved with the magnetic resonance system. For example, these devices should be moved with a portable magnetic resonance system. A DAD is fully sealed and wirelessly chargeable for allowing simple cleaning and avoiding battery exchange in hospital and/or patient environments. Therefore, wireless charging should be done at a storage place of the DAD. Such a DAD should also be small and lightweight for a good workflow and good mobility of the DAD and the entire magnetic resonance system. This results in the technical need for a low-capacity battery and to recharge as soon as the DAD is idle. A standard wireless charging interferes with magnetic resonance imaging due to radio frequency interference and a modulation of the magnetic field. Accordingly, immediate charging of the DAD may be impossible due to current imaging. SUMMARY OF THE INVENTION Therefore, there exists a need for optimizing wireless charging of detachable accessory devices (DAD), in particular for optimizing wireless charging during an acquisition of a magnetic resonance imaging. An object of the invention is to provide an effective and improved charging of detachable accessory devices during an acquisition of a magnetic resonance imaging without impairing the received imaging data of the magnetic resonance system. In particular, it is the object of the invention to reduce, or even avoid any influence of a charger of one or more detachable accessory devices for reducing, or even avoiding imaging artefacts. The object of the present invention is solved with the subject matter of the independent claims, wherein further embodiments are incorporated in the dependent claims. According to a first aspect of the invention, a method for wireless charging of one or more detachable accessory devices during acquisition of magnet resonance imaging data is provided. The method comprises the steps of receiving magnet resonance system data from an MR system; receiving charging data from a charger of a detachable accessory device comprising at least a charging field of the charger; determining an influence of the charging field of the charger on the magnet resonance imaging data; charging at least one detachable accessory device during acquisition of magnet resonance imaging data, and reducing, or even avoiding the influence of the charging field on the magnet resonance imaging data during charging of the at least one detachable accessory device by using the magnet resonance system data. In the context of the present invention, the term "detachable accessory device" may be understood to describe any portable device used during an image acquisition of the MR system. These detachable accessory devices (DAD) can be removed from the MR system or can be removed from a location near the MR system to be used. For example, a detachable accessory device may be MR coils, user pads as mobile screens and input devices, an ECG detection unit, and a respiratory sensor, but the examples are not limited to this list. Any other detachable accessory device, which needs to be used during an image acquisition of an MR System. In the context of the present invention, the term "MR system" should be understood to describe any MR system, in particular the invention may be applicable for portable MR imaging devices. Portable MR systems can be moved within a hospital and in other environments. These portable MR systems may be able to provide more accessible MR imaging and do not require a large and fixed hospital installation including an RF (radio frequency) shielded room and technical room. These systems can be wheeled around and plugged into normal mains power used at the point of care, for example at the bed of the patient. Further, they can be used in emergency departments, intensive care units and operating rooms. Even if the invention may be applicable for portable MR systems, the invention is not limited to the portable systems. An MR system, such as fixed or portable systems, comprise MRI hardware components, such as RF coils. These RF coils have at least two functions, firstly, to excite magnetization by broadcasting the RF power (Tx-Coil) and secondly, to receive the signal from the patient (Rx-Coil) that is