Position-finding apparatus

1. An apparatus comprising:

at least one receiver configured to receive signals relating to a place and orientation of a device relative to a head, the device being capable of inducing an electric field in the head, a location in the head where the electric field is induced depending on a place where the device is, the strength of the electric field in the location depending on the orientation of the device;

at least one processing core configured to determine, at least in part based on the received signals, the place and orientation of the device relative to the head, to compare the place and orientation of the device relative to the head to information concerning a place and orientation of the device corresponding to a maximal induced electric field strength being induced in a treatment area, and to cause signals to be transmitted, and

wherein the at least one processing core is configured to firstly cause signals to be transmitted which are configured to cause a display to indicate a first deviation, of the place of the device from the place corresponding to the maximal induced electric field strength being induced in the treatment area, and then, upon the at least one processing core receiving signals that indicate the device is placed in the place corresponding to the maximal induced electric field strength being induced in the treatment area, the at least one processing core is responsively secondly configured to cause signals to be transmitted which are configured to indicate a second deviation, the second deviation being a deviation of orientation, such that changing the orientation of the device to eliminate the second deviation increases the induced electric field strength in the treatment area but does not change a specific location inside the head where the induced electric field strength is maximized.

2. An apparatus according to claim 1 , wherein the transmitted signals are configured to cause the display to indicate the first deviation and the second deviation in terms of at least one of pitch, roll, yaw, rotation and distance.

3. An apparatus according to claim 2 , wherein the transmitted signals are configured to cause the display to indicate the first deviation and the second deviation in terms of at least two of pitch, roll, yaw, rotation and distance.

4. An apparatus according to claim 2 , wherein the transmitted signals are configured to cause the display to indicate the first deviation and the second deviation in terms of at least three of pitch, roll, yaw, rotation and distance.

5. An apparatus according to claim 2 , wherein the transmitted signals are configured to cause the display to indicate the first deviation and the second deviation in terms of pitch, roll, yaw, rotation and distance.

6. An apparatus according to claim 1 , wherein the apparatus is configured to cause the display to display a signal responsive to a determination that the device is at the place and orientation corresponding to the maximal induced electric field.

7. An apparatus according to claim 1 , wherein the apparatus is configured to trigger the device responsive to a determination that the device is at the place and orientation corresponding to the maximal induced electric field.

8. An apparatus according to claim 1 , wherein the at least one receiver is further configured to receive, from the device, at least one signal indicating whether the device is ready for use.

9. An apparatus according to claim 1 , wherein the apparatus comprises the device, the device comprising a transcranial magnetic stimulation device.

10. An apparatus according to claim 1 , wherein the apparatus is configured to, responsive to an instruction from a user, store a current specific location in the brain the device would interact with and subsequently determine the first deviation as a deviation between a current place of the device from where the device would induce a maximal electric field strength to the stored location.

11. An apparatus according to claim 1 , wherein the place and orientation corresponding to the maximal induced electric field comprises a place and orientation corresponding to the maximal induced electric field at a specific location.

12. The apparatus according to claim 1 wherein the transmitted signals are configured to cause a graphical indication of the first and second deviations.

13. A method comprising:

receiving signals relating to a position of a device relative to a place and orientation of the device relative to a head, the device being capable of inducing an electric field in the head, a location in the head where the electric field is induced depending on a place where the device is, the strength of the electric field in the location depending on the orientation of the device;

determining, at least in part based on the received signals, the place and orientation of the device relative to the head, comparing the place and orientation of the device relative to the head to information concerning a place and orientation of the device corresponding to a maximal induced electric field strength being induced in a treatment area, and

transmitting firstly first signals configured to cause a display to indicate a first deviation, of the place of the device from the place corresponding to the maximal induced electric field strength being induced in the treatment area, and upon the received signals indicating that the device is placed in the place corresponding to the maximal induced electric field strength being induced in the treatment area,

responsively secondly transmitting second signals configured to indicate a second deviation, the second deviation being a deviation of orientation, such that changing the orientation of the device to eliminate the second deviation increases the induced electric field strength in the treatment area but does not change a specific location inside the head where the induced electric field strength is maximized.

14. A method according to claim 13 , wherein the transmitted signals are configured to cause the display to indicate the first deviation and the second deviation in terms of at least one of pitch, roll, yaw, rotation and distance.

15. A method according to claim 13 , wherein the transmitted signals are configured to cause the display to indicate the first deviation and the second deviation in terms of at least two of pitch, roll, yaw, rotation and distance.

16. A method according to claim 13 , wherein the transmitted signals are configured to cause the display to indicate the first deviation and the second deviation in terms of at least three of pitch, roll, yaw, rotation and distance.

17. A method according to claim 13 , wherein the transmitted signals are configured to cause the display to indicate the first deviation and the second deviation in terms of pitch, roll, yaw, rotation and distance.

18. A method according to claim 13 , further comprising, responsive to an instruction from a user, storing a current specific location in the brain the device would interact with and subsequently determining the first deviation as a deviation between a current place and orientation and a place and orientation from where the device would induce a maximal electric field strength to the stored location.

19. A non-transitory computer readable medium having stored thereon a set of computer readable instructions that, when executed by at least one processor, cause an apparatus at least to:

receive signals relating to a position of a device relative to a place and orientation of the device relative to a head, the device being capable of inducing an electric field in the head, a location in the head where the electric field is induced depending on a place where the device is, the strength of the electric field in the location depending on the orientation of the device,

determine, at least in part based on the received signals, the place and orientation of the device relative to the head,

compare the place and orientation of the device relative to the head to information concerning a place and orientation of the device corresponding to a maximal induced electric field strength being induced in a treatment area, and

transmit firstly first signals configured to cause a display to indicate a first deviation, of the place of the device from the place corresponding to the maximal induced electric field strength being induced in the treatment area, and upon the received signals indicating that the device is placed in the place corresponding to the maximal induced electric field strength being induced in the treatment area, responsively secondly transmit second signals configured to indicate a second deviation, the second deviation being a deviation of orientation, such that changing the orientation of the device to eliminate the second deviation increases the induced electric field strength in the treatment area but does not change a specific location inside the head where the induced electric field strength is maximized.