CN219594618U

CN219594618U - Electrocardiogram apparatus and magnetic resonance apparatus configured for use in conjunction with magnetic resonance apparatus

Info

Publication number: CN219594618U
Application number: CN202222109719.1U
Authority: CN
Inventors: 乌尔里克·巴策尔; 迈克尔·罗阿斯-莱夫勒; 克里斯多佛·霍恩
Original assignee: Siemens Healthineers AG
Current assignee: Siemens Medical Ag
Priority date: 2021-08-12
Filing date: 2022-08-11
Publication date: 2023-08-29
Anticipated expiration: 2032-08-11
Also published as: DE202021104314U1

Abstract

The utility model relates to an electrocardiographic device configured for use in connection with a magnetic resonance device, the electrocardiographic device comprising: -at least three electrodes comprising a first electrode, a second electrode and a third electrode; -a receiving unit configured to be positioned at a distance of less than 10cm from the examination object; and at least three electrode lines including a first electrode line connecting the first electrode with the receiving unit, a second electrode line connecting the second electrode with the receiving unit, and a third electrode line connecting the third electrode with the receiving unit, wherein the first electrode line and the second electrode line have a shorter length than the third electrode line. The utility model further relates to a magnetic resonance apparatus comprising such an EKG apparatus.

Description

Electrocardiogram apparatus and magnetic resonance apparatus configured for use in conjunction with magnetic resonance apparatus

Technical Field

The utility model relates to an electrocardiographic device (EKG device) for use in connection with a magnetic resonance device and to a magnetic resonance device comprising such an EKG device.

Background

In magnetic resonance apparatuses, the body to be examined of an examination subject, in particular of a patient, is generally subjected to a relatively large main magnetic field, for example a main magnetic field of 1.5 tesla or 3 tesla or 7 tesla, by means of a main magnet. In addition, radio-frequency signals are induced in the nuclear spins by means of gradient pulses and radio-frequency pulses, which are received by means of suitable radio-frequency antennas and reconstructed into image data. The time sequence of gradient pulses and radio frequency pulses is typically preset by an MR control sequence. The MR control sequence may be synchronized with the heartbeat of the patient, which is advantageous in particular in cardiac examinations. For this purpose, an electrocardiogram of the patient can be recorded by means of the EKG device prior to or during the magnetic resonance examination. This is typically done at the moment when the patient is positioned within the magnetic resonance apparatus and subjected to the main magnetic field. In this case, interactions occur between the main magnetic field, the physical effects produced thereby and the EKG device.

In particular, the interaction of the magnetohydrodynamic effect (MHD) produced by the blood flow of an examination subject in a magnetic field is known, for example, as disclosed in Abi-Abdallah et al, "Alterations in human ECG due to the MagnetoHydroDynamic effect: A method for accurate R peak detection in the presence of high MHD artifacts",2007 29th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. MHD typically causes an increase in T waves in the electrocardiogram. The influence can be reduced by placing the electrodes of the electrocardiographic device in the upper body of the patient, which placement is not precisely defined in the professional field but is determined based on empirical values of the medical staff.

Disclosure of Invention

The utility model is based on the object of providing an easy-to-use device for producing a reliable electrocardiogram, in particular in the case of use in a static magnetic field of at least 0.5 tesla. The object is achieved by an electrocardiographic device (EKG device) for use in connection with a magnetic resonance device and a magnetic resonance device comprising such an EKG device. Advantageous embodiments are described in the following description.

An electrocardiographic device (EKG device) according to the present utility model configured for use in conjunction with a magnetic resonance device comprises:

at least three electrodes including a first electrode, a second electrode, and a third electrode,

a receiving unit which is configured to be positioned at a distance of less than 10cm from an examination object, in particular an examination object surrounded by a magnetic resonance apparatus, and

at least three electrode lines including a first electrode line connecting the first electrode with the receiving unit, a second electrode line connecting the second electrode with the receiving unit, and a third electrode line connecting the third electrode with the receiving unit,

wherein the first electrode line and the second electrode line have a shorter length than the third electrode line.

For this purpose, the electrodes are typically designed for being placed, in particular releasably fastened, on the skin and/or on the surface of the examination subject. The electrodes preferably comprise sensors which are designed to detect electrical signals originating from the body of the examination object, in particular from the heart movement and/or the heart excitation of the examination object. The electrodes typically comprise electrode terminals to which electrode lines, preferably exactly one electrode line, are connected. The connection between the electrode track and the electrode may be configured releasably and/or permanently.

For this purpose, the electrode lines are typically designed to connect the electrodes to the receiving unit, respectively. The electrode lines typically comprise conductive cables that are preferably insulated outwardly. For this purpose, the electrode lines are typically designed to transmit EKG signals, which are detected by electrodes connected to the electrode lines, to the receiving unit.

The receiving unit is preferably a coupling unit, which is designed for the purpose of combining and/or processing and/or evaluating the EKG signals detected by means of at least two of the at least three electrodes, preferably by means of the at least three electrodes. The receiving unit may comprise a filter unit configured to filter the EKG signal and/or an amplifier unit configured to amplify the EKG signal. The receiving unit may also comprise a status unit, which status unit is configured to recognize the function and/or use of at least one of the at least three electrodes. The receiving unit may comprise a processor unit configured to evaluate at least three EKG signals of at least three electrodes and/or to create an EKG based on the EKG signals.

The receiving unit is preferably connected to an EKG control unit. The connection may be made cable-based. The connection is preferably radio-based. The EKG control unit can be arranged in a space in which the HF shield of the magnetic resonance apparatus is also arranged.

The EKG control unit can be arranged outside the space in which the HF shield of the magnetic resonance apparatus is also arranged. The EKG control unit is typically connected to the magnetic resonance apparatus, in particular to a control unit comprised by the magnetic resonance apparatus. The receiving units are typically configured to be positioned at a distance of less than 10cm, preferably less than 5cm, particularly preferably less than 3cm from the examination object. The receiving unit may be configured to be positioned on the surface of the examination object, in particular on the upper body and/or the abdomen.

It is known that disturbances occur in the equipotential region in addition to MHD in the electrocardiogram. It has been realized that the disturbance is due to the movement of at least one electrode line. The movement may be induced, for example, by examining the pulse of the subject, whereby the electrode track may be placed in oscillation. Since the electrode lines are subjected to the main magnetic field when using an EKG device in a magnetic resonance system, a corresponding disturbance of the EKG signal occurs during the movement. In particular, oscillations having frequencies in the frequency range of the EKG may be excited and distort the EKG. Filtering the frequency induced by such oscillations is particularly difficult. The relative lengths of the at least three electrode lines according to the utility model enable the positioning of the at least three electrodes such that a representative EKG signal can be received from the heart of the examination subject, wherein the electrode lines have a minimum distance from the surface of the examination subject. Thus, the EKG device according to the utility model reduces the movement of at least three electrode lines by suitably selecting the length of the electrode lines, whereby the electrode lines are preferably not free to be overhead (freiflied) when arranged at the examination object. The length of the at least three electrode tracks is designed such that the position for the electrode arrangement can be selected as small as possible depending on the anatomy of the examination subject with the curvature of the at least three electrode tracks.

In particular, by selecting the length of the electrode lines according to the utility model, the curvature of the electrode lines is reduced and/or minimized. The electrode wire can be well fixed to the skin of the inspection object without being bent when necessary. The EKG device according to the utility model is therefore designed for the particularly accurate generation of an electrocardiogram, which is error-minimized, in particular in the equipotential regions. The EKG device according to the utility model can also be advantageously realized by retrofitting an existing EKG device with corresponding electrode lines, whereby the EKG device can be manufactured cost-effectively.

An embodiment of the EKG device proposes that the third electrode track is arranged at least partially between the first electrode track and the second electrode track. According to the embodiment, the electrodes can be positioned particularly well with respect to the heart of the examination subject while minimizing the curvature of the at least three electrode lines, taking into account the anatomical structure. Thus, during operation of the EKG device, the movement of the electrode lines is reduced, thereby eliminating artifacts in the electrocardiogram.

An embodiment of the EKG device proposes that the first electrode track and the second electrode track have a length which is at least 3cm shorter, preferably at least 5cm shorter, particularly preferably at least 8cm shorter than the third electrode track. The first electrode and the second electrode can thereby be positioned particularly well laterally at the heart of the examination subject, in particular transversely to the heart of the examination subject, wherein the third electrode can be arranged on the skull side relative to the first electrode and the second electrode, while one of the at least three electrode tracks has no curvature. Thus, during operation of the EKG device, the movement of the electrode lines is reduced, thereby eliminating artifacts in the electrocardiogram.

An embodiment of the EKG device proposes that the length of the first electrode track and the length of the second electrode track differ by at most 5cm, preferably at most 3cm, particularly preferably at most 1cm. This reflects the typical position of the first and second electrodes laterally, in particular transversely, to the heart. The described embodiment of the EKG device provides that the electrode track is adapted particularly well to the anatomy of the heart taking into account the measurement position. Thus, during operation of the EKG device, the movement of the electrode lines is reduced, thereby eliminating artifacts in the electrocardiogram.

An embodiment of the EKG device proposes that the length of the second electrode track corresponds to the length of the first electrode track. The described embodiment of the EKG device provides that the electrode track is adapted particularly well to the anatomy of the heart taking into account the measurement position.

An embodiment of the EKG device proposes that the first electrode track and/or the second electrode track have a length of between 5cm and 15cm, preferably between 8cm and 12cm, particularly preferably between 9.5cm and 10.5cm, and/or that the third electrode track have a length of between 10cm and 25cm, preferably between 14cm and 21cm, particularly preferably between 16.5cm and 18.5 cm. The dimensions have proven to be particularly practical and suitable for a plurality of examination objects. The EKG device according to the embodiment can therefore be arranged particularly simply at the examination subject. In this way, an electrocardiogram can be recorded particularly reproducibly and robustly.

An embodiment of the EKG device additionally comprises a fourth electrode and a fourth electrode track connecting the fourth electrode to the receiving unit, wherein the length of the fourth electrode track differs from the length of the third electrode track by at most 5cm, preferably at most 3cm, particularly preferably at most 1cm. An EKG device comprising four electrodes can produce particularly accurate electrocardiograms. In the case of a corresponding proportion of the length of the electrode lines according to the embodiment, the movements in all four electrode lines are minimized, which results in a particularly accurate electrocardiogram.

An embodiment of the EKG device proposes that each of the at least three electrode lines comprises at least one hollow-cylindrical sleeve, which surrounds the electrode line at least partially in the longitudinal direction.

The electrode lines typically comprise electrical conductors. The electrical conductor is typically surrounded by an insulation, in particular a cladding. The electrical conductor and/or the cladding preferably extends in the longitudinal direction.

The sleeve typically encloses less than 50%, preferably less than 40%, particularly preferably less than 30% of the electrode track in the longitudinal direction. The sleeve can be formed flexibly, in particular flexibly, in the longitudinal direction. The sleeve preferably completely encloses the electrode track in the radial direction. One of the at least three electrode lines may be surrounded by two or more sleeves, wherein the two or more sleeves differ in position in the longitudinal direction and/or the two or more sleeves do not have an overlap.

The sleeve may be configured and/or act as a weighting element. The EKG system according to the embodiment thus prevents free-standing electrode lines particularly well, since at least three electrode lines have a small distance from the surface of the test object on the one hand due to their length selection and are weighted and/or positioned in their position by the sleeve on the other hand. The electrode lines of the described embodiment of the EKG device therefore have a particularly small movement during operation, as a result of which particularly precise electrocardiography can be produced.

One embodiment of the EKG device proposes that the sleeve comprises a solid material, in particular ceramic and/or a dense plastic, for example polyvinylidene fluoride (PVDF).

Such materials have a particularly good density and can operate particularly well due to the smooth surface. The density-dependent mass of the sleeve represents a particularly good compromise between a sufficient mass for weight gain and a comfortable support for the examination subject.

An embodiment of the EKG device proposes that the length of the sleeve in the longitudinal direction is at most 4cm, preferably at most 2.5cm, particularly preferably at most 1.5cm. Such a sleeve minimizes the flexibility of the electrode lines and results in a particularly good local support on the surface of the examination object.

An embodiment of the EKG device proposes that the third electrode track comprises at least two sleeves having a distance in the longitudinal direction of at least 1cm, preferably at least 1.5cm, particularly preferably at least 2cm, from one another. The sleeve thus provided minimizes the flexibility of the electrode lines and results in a particularly good partial support on the surface of the examination object.

An embodiment of the EKG device proposes that the sleeve has a mass of between 5g and 30g, preferably between 10g and 20g, particularly preferably between 13g and 17 g. The embodiment is a particularly good compromise between a sufficient mass for weight gain and a comfortable support for the examination object.

An embodiment of the EKG device proposes that the sleeve has an outer radius of at most 25mm, preferably at most 20mm, particularly preferably at most 18 mm. The electrode track surrounded by such a sleeve is actually operable and movable, whereby the EKG device, in particular the electrode, can be easily connected to the examination object.

An embodiment of the EKG device proposes that each of the at least three electrode lines has a mass of at least 10g per meter, preferably at least 12g per meter, particularly preferably at least 14g per meter in the longitudinal direction. The embodiment is a particularly good compromise between a sufficient mass for weight gain, in particular for reducing movements, and a comfortable support for the examination object.

Furthermore, the utility model is based on a magnetic resonance apparatus comprising: a main magnet configured for generating a static main magnetic field of at least 0.5 tesla, preferably at least 1.4 tesla, particularly preferably at least 2.9 tesla in a patient receiving region at least partially surrounded by a magnetic resonance apparatus; and an EKG device according to the utility model, which is arranged in the patient accommodation region and in which at least three electrodes comprised by the EKG device are configured for detecting an EKG signal of an examination object arranged in the patient accommodation region.

The advantages of the magnetic resonance apparatus according to the utility model substantially correspond to those described in detail hereinabove of the EKG apparatus according to the utility model. The features, advantages, or alternative embodiments mentioned herein may also be applied to other claimed objects as well, and vice versa.

Drawings

Other advantages, features and details of the utility model emerge from the embodiments described below and from the figures.

The drawings show:

figure 1 shows in a schematic view a first embodiment of an EKG device according to the utility model,

figure 2 shows in a schematic view a second embodiment of an EKG device according to the utility model,

fig. 3 shows in a schematic diagram a third embodiment of an EKG device according to the utility model, an

Figure 4 shows in a schematic view a magnetic resonance apparatus according to the utility model.

Detailed Description

Fig. 1 shows a first embodiment of an EKG device 50 according to the utility model in a schematic diagram, the EKG device 50 being designed for use in conjunction with a magnetic resonance device 11. The EKG device 50 of the first embodiment includes a first electrode 31, a second electrode 32, and a third electrode 33. The EKG device 50 additionally comprises a receiving unit 51, which receiving unit 51 can be positioned at a distance of less than 10cm from the examination object 15, in particular the examination object 15 enclosed by the magnetic resonance device 11. The EKG device 50 of the first embodiment additionally comprises a first electrode line 41 connecting the first electrode 31 with the receiving unit 51, a second electrode line 42 connecting the second electrode 32 with the receiving unit 51, and a third electrode line 43 connecting the third electrode 33 with the receiving unit 51. The first electrode line 41 and the second electrode line 42 have a shorter length than the third electrode line 43. The first embodiment of the EKG device 50 preferably proposes that the EKG device 50 comprises exactly three electrodes 31, 32, 33 and exactly three electrode lines 41, 42, 43. The third electrode line 43 is particularly preferably arranged between the first electrode line 41 and the second electrode line 42 at the receiving unit 51. The length of the second electrode line 42 preferably corresponds to the length of the first electrode line 41.

Fig. 2 shows a second embodiment of an EKG device 50 according to the utility model in a schematic illustration. The second embodiment differs from the first embodiment in that the EKG device 50 additionally comprises a fourth electrode 34 and a fourth electrode line 44 connecting the fourth electrode 34 with a receiving unit 51. The length of the fourth electrode line 44 differs from the length of the third electrode line 43 by at most 5cm, preferably at most 3cm, particularly preferably at most 1cm.

Fig. 3 shows a third embodiment of an EKG device 50 according to the utility model in a schematic illustration. The third embodiment differs from the first embodiment in that each of the at least three electrode lines 41, 42, 43 comprises at least one hollow-cylindrical sleeve 71, which sleeve 71 at least partially encloses the electrode lines 41, 42, 43 in the longitudinal direction.

Fig. 4 shows a magnetic resonance apparatus 11 according to the utility model in a schematic view. The magnetic resonance apparatus 11 comprises a detector unit formed by a magnet unit 13 having a main magnet 17 which is configured for generating a static main magnetic field of at least 0.5 tesla, preferably at least 1.4 tesla, particularly preferably at least 2.9 tesla. Furthermore, the magnetic resonance apparatus 11 has a cylindrical patient receiving area 14 for receiving the examination object 15, wherein the patient receiving area 14 is cylindrically enclosed by the magnet unit 13 in the circumferential direction. The examination object 15 can be pushed into the patient receiving region 14 by means of the patient support device 16 of the magnetic resonance device 11.

The magnet unit 13 also has a gradient coil unit 19, which gradient coil unit 19 is used for position encoding during imaging. The gradient coil unit 19 is operated by means of a gradient control unit 28. Furthermore, the magnet unit 13 has a radio frequency antenna unit 20 and a radio frequency antenna control unit 29 for exciting polarization. The radio frequency antenna unit 20 is operated by a radio frequency antenna control unit 29 and emits radio frequency pulses of radio frequency into an examination space which is substantially formed by the patient receiving region 14.

The magnetic resonance system 11 additionally comprises an EKG system 50 according to the utility model, which EKG system 50 is arranged in the patient receiving area 14, preferably in contact with the examination object 15. The magnetic resonance apparatus 11 preferably comprises an EKG control unit 52 arranged outside the patient receiving area 14. The EKG control unit 52 is preferably configured to control the EKG device 50, receive and/or evaluate the EKG signals. The EKG control unit 52 may also be configured to trigger MR control sequences and/or to guide breathing and/or to automatically evaluate the EKG based on the EKG signals detected by the EKG device 50. The EKG control unit 52 is typically connected to an EKG device 50. The connection between the EKG control unit 52 and the EKG device 50 is preferably radio-based and/or has no physical connection and/or has no wired connection.

For controlling the main magnet 17, the gradient control unit 28 and the radio frequency antenna control unit 29, the magnetic resonance apparatus 11 has a control unit 24. The control unit 24 centrally controls the execution of the magnetic resonance apparatus 11, for example an MR control sequence. The magnetic resonance apparatus 11 has a display unit 25. The control information, for example control parameters, as well as the reconstructed image data and/or the EKG signal, can be displayed for the user on the display unit 25, for example on at least one monitor. Furthermore, the magnetic resonance apparatus 11 has an input unit 26, by means of which input unit 26 information and/or control parameters can be entered by a user during a measurement process. The control unit 24 may comprise a gradient control unit 28 and/or a radio frequency antenna control unit 29 and/or a display unit 25 and/or an input unit 26 and/or an EKG control unit 52.

The illustrated magnetic resonance apparatus 11 may of course comprise other components that are typically present in magnetic resonance apparatuses 11. Furthermore, the general operation of the magnetic resonance apparatus 11 is known to the person skilled in the art, so that a detailed description of the other components is omitted.

While the details of the utility model have been illustrated and described in detail by means of preferred embodiments, the utility model is not limited by the examples disclosed and other variants can be derived therefrom by a person skilled in the art without departing from the scope of protection of the utility model.

Claims

1. An electrocardiograph device configured for use with a magnetic resonance device, the electrocardiograph device comprising:

a receiving unit configured to be positioned at a distance of less than 10cm from the inspection object, and

it is characterized in that the method comprises the steps of,

the first electrode line and the second electrode line have a shorter length than the third electrode line.

2. The electrocardiograph according to claim 1,

wherein the examination object is surrounded by the magnetic resonance apparatus.

3. The electrocardiographic device according to claim 1 or 2,

wherein the third electrode line is at least partially disposed between the first electrode line and the second electrode line.

4. The electrocardiographic device according to claim 1 or 2,

wherein the first electrode line and the second electrode line have a length that is at least 3cm shorter than the third electrode line.

5. The electrocardiographic device according to claim 1 or 2,

wherein the first electrode line and the second electrode line have a length that is at least 5cm shorter than the third electrode line.

6. The electrocardiographic device according to claim 1 or 2,

wherein the first electrode line and the second electrode line have a length that is at least 8cm shorter than the third electrode line.

7. The electrocardiographic device according to claim 1 or 2,

wherein the length of the first electrode wire and the length of the second electrode wire differ by at most 5cm.

8. The electrocardiographic device according to claim 1 or 2,

wherein the length of the first electrode line and the length of the second electrode line differ by at most 3cm.

9. The electrocardiographic device according to claim 1 or 2,

wherein the length of the first electrode line and the length of the second electrode line differ by at most 1cm.

10. The electrocardiographic device according to claim 1 or 2,

wherein the length of the second electrode line corresponds to the length of the first electrode line.

11. The electrocardiographic device according to claim 1 or 2,

wherein the first electrode line and/or the second electrode line has a length of between 5cm and 15cm,

and/or the third electrode line has a length of between 10cm and 25 cm.

12. The electrocardiograph according to claim 11,

wherein the first electrode line and/or the second electrode line has a length of between 8cm and 12 cm.

13. The electrocardiograph according to claim 11,

wherein the first electrode line and/or the second electrode line has a length of between 9.5cm and 10.5 cm.

14. The electrocardiograph according to claim 11,

wherein the third electrode line has a length between 14cm and 21 cm.

15. The electrocardiograph according to claim 11,

wherein the third electrode line has a length between 16.5cm and 18.5 cm.

16. The electrocardiographic device according to claim 1 or 2,

the electrocardiographic device additionally comprises a fourth electrode and a fourth electrode line connecting the fourth electrode with the receiving unit, wherein the length of the fourth electrode line differs from the length of the third electrode line by at most 5cm.

17. The electrocardiograph according to claim 16,

wherein the length of the fourth electrode line differs from the length of the third electrode line by at most 3cm.

18. The electrocardiograph according to claim 16,

wherein the length of the fourth electrode line differs from the length of the third electrode line by at most 1cm.

19. The electrocardiographic device according to claim 1 or 2,

wherein each of the at least three electrode lines comprises at least one hollow cylindrical sleeve, which at least partially encloses the electrode line in the longitudinal direction.

20. The electrocardiograph according to claim 19,

wherein the sleeve comprises a solid material.

21. The electrocardiograph according to claim 20,

wherein the sleeve comprises ceramic and/or dense plastic.

22. The electrocardiograph according to claim 21,

wherein the sleeve comprises polyvinylidene fluoride.

23. The electrocardiograph according to claim 19,

wherein the sleeve has a length in the longitudinal direction of at most 4cm.

24. The electrocardiograph according to claim 19,

wherein the sleeve has a length in the longitudinal direction of at most 2.5cm.

25. The electrocardiograph according to claim 19,

wherein the sleeve has a length in the longitudinal direction of at most 1.5cm.

26. The electrocardiograph according to claim 19,

wherein the third electrode line comprises at least two sleeves having a distance of at least 1cm from each other in the longitudinal direction.

27. The electrocardiograph according to claim 19,

wherein the third electrode track comprises at least two sleeves having a distance of at least 1.5cm from each other in the longitudinal direction.

28. The electrocardiograph according to claim 19,

wherein the third electrode line comprises at least two sleeves having a distance of at least 2cm from each other in the longitudinal direction.

29. The electrocardiograph according to claim 19,

wherein the sleeve has a mass of between 5g and 30 g.

30. The electrocardiograph according to claim 19,

wherein the sleeve has a mass of between 10g and 20 g.

31. The electrocardiograph according to claim 19,

wherein the sleeve has a mass of between 13g and 17 g.

32. The electrocardiograph according to claim 19,

wherein the sleeve has an outer radius of at most 25 mm.

33. The electrocardiograph according to claim 19,

wherein the sleeve has an outer radius of at most 20 mm.

34. The electrocardiograph according to claim 19,

wherein the sleeve has an outer radius of at most 18 mm.

35. The electrocardiograph according to claim 19,

wherein each of the at least three electrode lines has a mass of at least 10g per meter in the longitudinal direction.

36. A magnetic resonance apparatus, the magnetic resonance apparatus comprising: a main magnet configured to generate a static main magnetic field of at least 0.5 tesla in a patient containment region at least partially enclosed by the magnetic resonance apparatus;

it is characterized in that the method comprises the steps of,

the magnetic resonance apparatus comprising an electrocardiographic apparatus according to any one of the preceding claims, the electrocardiographic apparatus being disposed within the patient-receiving region,

and wherein the at least three electrodes comprised by the electrocardiographic device are configured for detecting electrocardiographic signals of an examination object disposed within the patient-receiving region.

37. The magnetic resonance apparatus of claim 36,

wherein the main magnet is configured to generate a static main magnetic field of at least 1.4 tesla in the patient receiving region.

38. The magnetic resonance apparatus of claim 36,

wherein the main magnet is configured to generate a static main magnetic field of at least 2.9 tesla in the patient receiving region.