Magnetic resonance apparatus

Abstract

The present invention relates to a magnetic resonance apparatus, the magnetic resonance apparatus having a main magnet unit, the main magnet unit having a cylindrical patient accommodation portion, the main magnet unit having: a cylindrical main magnet device, a bearing structure for carrying a main magnet coil being supported in the vacuum vessel by means of a plurality of suspension elements; at least one reinforcing ring; a gradient connection plate for a gradient coil device, the gradient coil device being arranged in particular in a manner surrounding the patient accommodation portion; and a covering device having at least one covering part, the at least one covering part delimiting the main magnet unit towards the outside, the gradient connection plate being fastened to a side part, in particular an end side, of the main magnet unit between the vacuum vessel and the covering device, and at least one reinforcing ring arranged in particular centrally in the longitudinal direction of the main magnet unit being configured flatter in a top region extending around the highest point of the vacuum vessel and / or in a bottom region extending around the lowest point of the vacuum vessel than in a laterally connecting region.

Description

Technical Field

[0001] The present invention relates to a magnetic resonance apparatus having a main magnet unit with a cylindrical patient accommodation section having a diameter of at least 55 cm, in particular at least 60 cm, wherein the main magnet unit has:

[0002] - a cylindrical main magnet device bounded outwardly by a vacuum vessel, a bearing structure carrying the main magnet coil being supported in the vacuum vessel by means of a plurality of suspension elements which are fastened externally to the vacuum vessel in a fastening region,

[0003] - at least one reinforcement ring which is guided at least partially around the vacuum vessel, fixed to the vacuum vessel and covering the fastening region by means of a covering element,

[0004] - a gradient connection plate for a gradient coil device which is arranged, in particular, so as to surround the patient accommodation section, and

[0005] - a covering device having at least one covering part which bounds the main magnet unit outwardly. Background Art

[0006] Such a magnetic resonance apparatus is also known as a whole-body system since a patient can be moved into the patient accommodation section so that ultimately any part of the human body can be accommodated. Due to the required dimensions of the patient accommodation section and other components required for imaging, whole-body magnetic resonance apparatuses have dimensions which generally require significant structural measures during installation. Here, an important measured value is the height of the main magnet unit since, when transporting through corridors in a hospital and / or a radiology clinic, the doors are usually the height-limiting factor. Even if there is the possibility of removing the doors, there are often problems in that load-bearing concrete structures are installed above the doors and these cannot be damaged for transporting the main magnet unit. The height of the main magnet unit is also relevant when transporting in a heavy-duty elevator as may be present in larger clinical devices. Modern magnetic resonance apparatuses usually have a height significantly exceeding two meters, such that, for example, walls have to be damaged, heavy-duty cranes have to be used, etc.

[0007] There are multiple characteristics of known magnetic resonance apparatuses that ensure a large height of the main magnet unit. For example, for a main magnet coil supported in liquid helium, it is necessary to arrange the cold head above the maximum liquid level of helium. The gradient connection plate for absorbing the high Lorentz force at the gradient coil cable and for damping vibrations, the fastening structure for lifting and transporting, the suspension structure of the superconducting main magnet coil, and also the cladding components cause a further increase in the dimensions in the vertical direction. For this reason, an increase in the dimensions of the main magnet unit, in particular the radius of the cylindrical main magnet apparatus, results in cost savings with respect to the superconducting wire and the weight, such that it is not simply feasible to reduce the radius of the cylindrical main magnet apparatus by, for example, 10 cm to 30 cm without significant costs. Summary of the Invention

[0008] Therefore, the object on which the present invention is based is to simplify the transportation of the main magnet unit of a whole-body magnetic resonance apparatus within an existing building.

[0009] To solve the stated object, according to the present invention, it is proposed in respect of a magnetic resonance apparatus of the type initially mentioned that:

[0010] - the gradient connection plate is fastened on the side, in particular the end side, of the main magnet unit between the vacuum vessel and the cladding device, and

[0011] - at least one reinforcing ring, in particular arranged centrally in the longitudinal direction of the main magnet unit, is configured flatter in the upper region extending around the highest point of the vacuum vessel and / or in the bottom region extending around the lowest point of the vacuum vessel than in the laterally connecting region.

[0012] Therefore, according to the present invention, it is first proposed to arrange the gradient connection plate laterally at the main magnet device and not, as has been common hitherto in the prior art, on the upper side. The gradient connection plate serves to absorb the high Lorentz force at the cable of the gradient coil leading to the gradient coil device and to avoid vibrations at the connection point between the feeder from the gradient amplifier and the cable leading to the gradient coil. Therefore, the arrangement of the gradient connection plate with respect to the main magnetic field is an important aspect, where studies have shown that, in addition to the upper side of the main magnet device, other positions are also suitable for meaningfully placing the gradient connection plate. For example, it is feasible to arrange the gradient connection plate on the end side, in particular laterally adjacent to the patient accommodation. A design variant is also conceivable in which the gradient connection plate is arranged on the longitudinal side of the vacuum vessel, for example in a region that is already provided for different electronic components.

[0013] In a magnetic resonance apparatus, the support of the main magnet coil is usually achieved via elastic suspension elements in order to decouple the vibrations of the main magnet coil from the vacuum vessel, which is usually also referred to as the "Outer Vacuum Container" - OVC, and to minimize the heat input from the outside into the superconducting main magnet coil. The suspension thus implemented tensions the main magnet coil internally in multiple directions. Usually, the suspension elements are not installed internally, especially welded, to the cylindrical vacuum vessel, but are installed externally, especially welded, to the cylindrical vacuum vessel and are covered or enclosed outwardly by covering elements of buttress rings. The buttress rings at least mostly surround the magnet annularly and are used for reinforcement, however this means an increase in the cylindrical surface in other cases. It has now been recognized according to the present invention that the construction of the buttress rings is decisive if a smaller height of the main magnet unit is to be achieved. Therefore, it is proposed that the buttress rings for the vacuum vessel be flattened not only in the upper region (top region) but also in the bottom region around the highest or lowest point of the vacuum vessel in order to provide a smaller overall structural height.

[0014] Particularly advantageously, this is further improved by other measures in terms of the suspension of the main magnet coil and the design of the buttress rings. Thus, in this context, a particularly advantageous improvement of the present invention proposes that the fastening regions, especially symmetrically in pairs with respect to the vertical central plane of the vacuum vessel, be laterally offset with respect to the highest point of the vacuum vessel, especially offset by at least 15 cm, preferably at least 20 cm, in the circumferential direction. This means that the fastening regions and thus the positions of the suspension points are as far out as possible away from the highest point of the vacuum vessel. Also advantageous in this context is that due to the outward movement of the fastening regions, the height of the covering elements in the fastening regions is at most only 0.4 cm to 5 cm above the highest point of the vacuum vessel, where an ideal design can even achieve that the covering elements are lower than the highest point. Similarly, it can also be proposed that the height of at least one buttress ring above the highest point in the upper region and / or above the lowest point in the bottom region be at most 0.4 cm to 5 cm. In this case, it should also be noted that within the flattened range in the upper region and / or the bottom region, it is entirely conceivable to leave a gap in the reinforcement structure formed by at least one buttress ring at the uppermost point or the lowest point of the vacuum vessel, where adjacent to the gap, the height of the buttress ring increases outwardly in the top region or the bottom region until it reaches the nominal height for the remaining region, which nominal height can be, for example, 3 cm to 6 cm.

[0015] In an advantageous design of the present invention, if the outer diameter of the vacuum vessel is between 1.8 m and 1.95 m, the height can be significantly reduced by means of the measures mentioned so far, and thus the transportability of the main magnet unit is better, for example, better transportability with respect to doors or freight elevators. For this purpose, measures in different technical fields have been combined, namely measures regarding the suspension of the main magnet coil, the design of the reinforcement elements, and the arrangement of the gradient connection plates. Nevertheless, the present invention also provides other measures that also contribute to reducing the overall height of the main magnet unit and bringing convenience to transportation.

[0016] Therefore, in an advantageous improvement of the present invention, it can be proposed that at least one covering member covering the upper side of the vacuum vessel and extending over at least most of the length of the main magnet unit is designed to be removable, in particular independently of other covering members covering the side regions. This means that the covering member in the upper region of the main magnet unit is designed such that the covering member can be easily removed for transportation, for example, by means of a corresponding detachable fastening mechanism. In this context, being easily removable means that at least one upper covering member can be removed without having to remove the (usually larger) covering members at the lower end side (front and rear sides) and / or the longitudinal sides. This can achieve that the height of the covering member at the upper side and its manufacturing and / or installation tolerances are not important for the transport height of the main magnet unit, and by removing the upper covering member, only minimal costs (working hours) are incurred.

[0017] In this context, it can also be proposed that the removable covering member is higher in the central region including at least one reinforcement ring and the fastening region than outside the central region beyond the height of the vacuum vessel. In particular, it can be proposed that at least one removable covering member at the upper side is raised only in the region of at least one reinforcement ring and the suspension point at the upper part of the main magnet device relative to the otherwise cylindrical shape. However, particularly advantageously, at least at the front end of the main magnet unit, the height by which the upper covering member (and, if necessary, other covering members) extends beyond the height of the vacuum vessel can be lower than the height in the central region, so that the smallest possible visual impression can be conveyed to the observer from the front, and increased flexibility is achieved even during transportation with the fastened removable covering member, for example, by appropriate tilting.

[0018] In a preferred design of the present invention, it can also be proposed that the main magnet unit further has at least one suspension device fastened to the vacuum vessel and / or at least one reinforcement ring, and the suspension device is used for transporting at least the main magnet device. The at least one suspension device is particularly symmetrically paired with respect to the vertical central plane of the vacuum vessel and is laterally offset relative to the highest point of the vacuum vessel, particularly offset by at least 15 cm, preferably at least 20 cm in the circumferential direction. The suspension device at least on the upper side of the main magnet device is already known from the prior art, for example, mounting hooks so that at least the main magnet device can be suspended by a crane above its center of gravity and can be transported. The corresponding suspension device must be constructed correspondingly rigidly and firmly. In order not to bulge significantly with respect to the maximum height of the main magnet unit here, it can also be proposed regarding the suspension device that the position of the suspension device is arranged as far as possible to the left and right outwards, for example, adjacent to and / or arranged at the covering element.

[0019] In the context, it can also be particularly advantageously proposed that at least one suspension device has a section having a joining opening, particularly an eyelet, for a hook, and the section can be flipped between a use position in which it is at least substantially erected in the vertical direction and ready for joining and a stationary position in which it is at least substantially placed in the circumferential direction. In other words, the joining section of the suspension device can be designed to be laterally downwardly flippable, so that the joining section only bulges upward in height for transportation by a crane, but does not bulge upward in height for transportation on the ground, for example, transportation by rollers, and thus does not contribute to the transportation height overall.

[0020] Another particularly advantageous design of the present invention may provide that at least one electronic unit and / or components of the patient accommodation ventilation device and / or at least one cable holder are provided in the side region of the main magnet unit, and the side region is located at at least one longitudinal side between the vacuum vessel and the cladding device. For example, such a side region that can be referred to as an electronic box and can provide accommodation space for electronic components, especially electronic units and other components, may be accompanied by a corresponding widening of the cladding components of the cladding device there. Such a side region can also be expediently adjusted within the scope of the present invention to allow a smaller transportation height and, in this regard, also an access height for maintenance, for example. Thus, if fastening on the end side is not desired, the gradient connection plate can be expediently fastened in the side region. In addition, the components can be arranged in the side region such that the upper end of at least one electronic unit and / or components of the patient accommodation ventilation device and / or at least one cable holder projects beyond the bottom plane by at most 1.9 m, especially at most 1.8 m. Thus, the components including the electronic unit, the patient ventilation device, and the holder for the cable, which are laterally mounted in the side region of the main magnet device, can be in a height region significantly lower than 2 m, preferably lower than 1.9 m, and particularly preferably lower than 1.8 m.

[0021] Furthermore, it has proven to be particularly expedient within the scope of the present invention that the upper end of the cooling component carrying the cold head of the cooling device for the main magnet coil, especially the turret, projects beyond the bottom plane by less than 1.8 m, especially less than 1.5 m. The cooling component carrying the cold head of the cooling device for the main magnet coil is generally referred to as a "turret". Other cryogenic technologies can also be accommodated in the cooling component. Now it is proposed to mount the cooling component significantly lower than is common in the prior art, especially such that a service height of at most 2.2 m is provided. In this way, the maximum height of the cooling component and the cold head located thereon are also reduced. If the cooling device operates with a helium amount of less than 100 liters, especially less than 10 liters, preferably less than 1 liter, and particularly preferably less than 0.1 liter, this situation can be achieved in a particularly obvious manner and method. Thus, the magnetic resonance device can be a so-called low-helium system or even a helium-free system, as has already been proposed in the prior art. This ensures a smaller liquid helium level height, which in turn sets a lower position for the cold head.

[0022] In the magnetic resonance apparatus according to the invention, it is also expedient for the lowest point of the vacuum vessel (and thus the main magnet device) to have a height of 0.1 mm to 20 mm above the bottom plane. In other words, the lowest point of the magnet column can be as close as possible to the bottom. In the ideal case, the spacing from the bottom is 0.1 mm to 20 mm, such that it is just ensured that the main magnet unit stands upright on its base, which is provided, for example, at the end side and / or at at least one reinforcing ring, and is not centered with respect to the main magnet device. Thus, the maximum radius is still available for the main magnet coil.

[0023] In summary, it can thus be said that the invention proposes a plurality of individual measures in the design of the main magnet unit, which in total contribute to a significant reduction in the height of the main magnet unit, in particular for a transport height of less than 2 m, without significantly reducing the radius of the main magnet coil and thus without increasing the costs. Thus, in particular, it can be proposed that the highest point of the main magnet unit, in particular in the case of removal of the upper covering part, is less than 2 m above the bottom plane. This can be achieved by an ingenious cooperation of different technical disciplines. Since many technically different characteristics contribute, such as the mechanical design of the magnet reinforcement up to the position of the electronics and cable holders and the design of the cryogenic technology and the construction of the covering parts.

[0024] Thus, for the first time, a whole-body magnetic resonance system with a transport height of less than 2 m is in particular realized, where the transport height is understood as the height at which the main magnet unit can be transported through an obstacle, such as a door. A roller system driven by hand or by motor can be used here. A strong increase in the costs of the system, such as the excessive costs of superconducting wires in the case of a very small magnet radius, is avoided here.

[0025] The magnetic resonance apparatus can expediently have a basic magnetic field strength of less than 1 tesla, in particular less than 0.6 tesla. Overall, such a low field strength allows a compact and less costly design of the magnetic resonance apparatus and also allows the use of less helium, as already explained above. Thereby, it generally also contributes to small transport dimensions, for example with respect to the lateral parts. Description of the Drawings

[0026] Other advantages and details of the invention result from the embodiments described below and from the drawings. Shown here are:

[0027] Figure 1 A perspective view of the main magnet unit of a magnetic resonance apparatus according to the invention without a covering device, shown from the front side,

[0028] Figure 2 Showing a perspective view corresponding to Figure 1 the front side and the opposite longitudinal side,

[0029] Figure 3Shows a detailed view of the upper side of the main magnet unit without a cladding device,

[0030] Figure 4 Shows a three-dimensional rear view of the main magnet unit without a cladding device,

[0031] Figure 5 Shows a side view of the main magnet unit without a cladding device,

[0032] Figure 6 Shows a three-dimensional view of the upper side of the main magnet unit with a cladding device, and

[0033] Figure 7 Shows a schematic cross-sectional view of the main magnet device of the main magnet unit. Detailed Description

[0034] Figures 1 to 6 Shows an embodiment of the main magnet unit 1 of a magnetic resonance apparatus according to the invention, which is suitable for a transport height of less than 2 m. Here, Figures 1 to 5 Shows the main magnet unit 1 still without a cladding device, which is Figure 6 Explained in more detail.

[0035] The main magnet unit 1 first of all comprises a main magnet device, which comprises at least one load-bearing structure carrying the main magnet coil and is bounded externally by a vacuum vessel 2 (Outer Vacuum Container - OVC). The vacuum vessel 2 is configured substantially cylindrically and defines a cylindrical patient accommodation 3 inside it, into which a patient can be moved by means of Figure 4 the shown examination couch 4 for examination. Surrounding the patient accommodation 3, a coil device 5, in particular a radio-frequency coil device and a gradient coil device, has been used. The diameter of the patient accommodation is at least 55 cm, currently exemplarily 60 cm, and maximally for example 75 cm. The outer diameter of the vacuum vessel 2 is between 1.8 m and 1.95 m.

[0036] On the outside of the vacuum vessel 2, a reinforcement structure is provided, currently at the end sides a reinforcement disk 6, which currently does not protrude beyond or at least does not significantly protrude beyond the vacuum vessel 2, and in the central central region two reinforcement rings 7 (buttress rings), which can be welded to the vacuum vessel 2 from the outside, for example, and can have interruptions. The reinforcement rings 7 are connected on their upper side by a covering element 8 belonging to them, which covers and stabilizes the fastening region and thus also covers and stabilizes the fastening points of the suspension elements for the main magnet coil inside the vacuum vessel 2.

[0037] As can be seen in particular from Figure 1 andFigure 3 As can be seen, the fastening regions and thus the suspension points are laterally displaced outwards, with the two fastening regions being opposed to each other in a symmetrically laterally offset manner with respect to the central vertical center plane of the vacuum vessel 2. Thereby, the covering element 8, if any, projects only very little beyond the highest point of the vacuum vessel 2, for example a maximum of 0.4 cm to 5 cm. As can be seen especially also in Figure 3 As can be seen, the reinforcement ring 7 is formed flat in the upper side region 9 extending around the highest point of the vacuum vessel 2, such that the height only slowly increases starting from the gap at the highest point, especially forming a vertical change, increasing to the maximum height in the region of the covering element 8. In this way, it is ensured that the reinforcement ring projects beyond the highest point of the vacuum vessel 2 by a maximum of 0.4 cm to 5 cm.

[0038] Adjacent to the outside of the covering element 8, there is also provided a suspension device 10, which currently includes an eyelet for engaging a hook for lifting and transporting at least the main magnet device. It can be seen that the eyelet is pivotally arranged at the basic element as a section having an engagement opening for the hook, such that the eyelet can move between a substantially vertical use position and an abutting rest position. Thus, the eyelet can be pivoted into the rest position during the ground transportation of the main magnet unit 1 as a pivotable section and does not increase the additional height.

[0039] Currently, there are four such suspension devices 10, which are respectively arranged symmetrically in pairs with respect to the vertical center plane of the vacuum vessel 2.

[0040] Other components of the main magnet unit 1 are fastened in the side region 11, which is at the longitudinal side between the vacuum vessel 2 and the cladding device. The other components are Figure 4 and Figure 5 can be best seen in. In addition to the electronic unit 12 for receiving electronic devices, the electronic unit 13 for transmitting electronic devices, the electronic unit 14 for the magnetic power supply device, the electronic unit 15 for controlling light and temperature, the electronic unit 16 for starting monitoring and shutdown monitoring, the cable holder 17 and the components 18 of the patient accommodation ventilation device (patient ventilator), the components also include a cooling component 20 (Turret) having a cold head 19. Since currently a cooling device operating with a small amount of helium, for example less than one liter of helium, is used, the cold head 19 can be arranged deeply, for example arranged less than 1.5 m beyond the bottom plane.

[0041] As can be seen, the upper ends of none of the components 12 to 17 are arranged more than 1.8 m beyond the bottom plane.

[0042] It should also be noted at this point that the lowest point of the vacuum vessel 2 is also generally set very close above the bottom plane, for example, at most 0.1 mm to 20 mm above the bottom plane. The vacuum vessel 2 is carried, for example, by a base 34 visible in Figure 1 and Figure 2 .

[0043] As can be learned from the illustration of Figure 5 , the gradient connection plate 21 of the gradient coil device is fastened to the rear end side of the main magnet unit, rather than on the upper side as has been common hitherto. It is also conceivable to position the gradient connection plate 21 in the side region 11.

[0044] Figure 6 The upper part of the main magnet unit 1 is shown, which has covering parts 22, 23 and 24 of a covering device that encloses the main magnet unit 1 outwardly. It can be seen that there is an upper covering part 24 which extends over most of the length of the main magnet unit 1 and is only formed elevated in the central region 35 including the reinforcement ring 7 and the covering element 8, while as can be seen at point 25, there is a height drop towards the end side. As shown by the narrow gap region 26, the covering part 24 can be designed to be removable, for example, removable via a suitable fastening mechanism 27. In this way, the transport height can be significantly reduced again, at least in the central region 35.

[0045] The magnetic resonance apparatus having the main magnet unit 1 preferably uses a low magnetic field strength, for example, a magnetic field strength less than or equal to 1 tesla, particularly less than or equal to 0.6 tesla.

[0046] Figure 7 The possible internal structure of the main magnet device 28 is schematically shown. The main magnet coil 29 is carried by a bearing structure 30 within a helium vessel 31, and the helium vessel 31 is surrounded by a temperature shield 32. A suspension element 33 is also schematically shown. The helium vessel 31 can also be omitted in a configuration that operates without helium or with a very small amount of helium.

[0047] Although the details of the present invention have been described and illustrated in detail by means of preferred embodiments, the present invention is not limited by the disclosed examples and other variants can be derived therefrom by those skilled in the art without departing from the scope of protection of the present invention.

Claims

1. A magnetic resonance apparatus, the magnetic resonance apparatus having a main magnet unit (1), the main magnet unit (1) having a cylindrical patient accommodation section (3), the patient accommodation section (3) having a diameter of at least 55 cm, wherein the main magnet unit (1) has: - a cylindrical main magnet device (28), the main magnet device (28) being bounded outwardly by a vacuum vessel (2), a carrier structure (30) carrying a main magnet coil (29) being supported in the vacuum vessel (2) by means of a plurality of suspension elements (33), the plurality of suspension elements (33) being fastened in a fastening region outside the vacuum vessel (2); - at least one reinforcing ring (7), the at least one reinforcing ring (7) at least partially guiding around the vacuum vessel (2), being fastened to the vacuum vessel (2) and covering the fastening region by means of a covering element (8); - a gradient connection plate (21) for a gradient coil device; and - a covering device having at least one covering part (22, 23, 24), the at least one covering part (22, 23, 24) bounding the main magnet unit (1) outwardly; characterized in that - the gradient connection plate (21) is fastened to a side of the main magnet unit (1) between the vacuum vessel (2) and the covering device; and - the at least one reinforcing ring (7) is configured to be flatter in an upper side region (9) extending around the highest point of the vacuum vessel (2) and / or in a bottom region extending around the lowest point of the vacuum vessel (2) than in a laterally connected region.

2. The magnetic resonance apparatus according to claim 1, characterized in that, The fastening region is laterally offset with respect to the highest point of the vacuum vessel (2).

3. The magnetic resonance apparatus according to claim 1 or 2, characterized in that, The height of the fastening region above the surface of the vacuum vessel (2) and / or the height of the at least one reinforcing ring (7) above the highest point in the upper side region (9) and / or the height above the lowest point in the bottom region is at most 0.4 cm.

4. The magnetic resonance apparatus according to claim 1 or 2, characterized in that, The outer diameter of the vacuum vessel (2) is between 1.8 m and 1.95 m.

5. The magnetic resonance apparatus according to claim 1 or 2, characterized in that, At least one covering part (24) covering the upper side of the vacuum vessel (2) and extending over at least most of the length of the main magnet unit (1) is designed to be removable.

6. The magnetic resonance apparatus according to claim 5, characterized in that The removable covering part (24) is higher in a central region (35) including the at least one reinforcing ring (7) and the fastening region than outside the central region (35) by the height exceeding the vacuum vessel (2).

7. The magnetic resonance apparatus according to claim 1 or 2, characterized in that, The main magnet unit (1) further has at least one suspension device (10) fastened to the vacuum vessel (2) and / or the at least one reinforcing ring (7), the at least one suspension device (10) being used for at least transporting the main magnet device (28), the at least one suspension device (10) being laterally offset with respect to the highest point of the vacuum vessel (2).

8. The magnetic resonance apparatus according to claim 7, wherein, The at least one suspension device (10) has a section with an engagement opening for a hook, the section being able to flip between a use position that is at least substantially erected in the vertical direction and ready for engagement and a rest position that is at least substantially placed in the circumferential direction.

9. The magnetic resonance apparatus according to claim 1 or 2, characterized in that, At least one electronic unit (12, 13, 14, 15, 16) and / or a component (18) of the patient accommodation ventilation device and / or at least one cable holder (17) are provided in a side region (11) of the main magnet unit (1), and the side region (11) is at at least one longitudinal side between the vacuum vessel (2) and the covering device.

10. The magnetic resonance apparatus according to claim 9, characterized in that, The gradient connection plate (21) is fastened in the side region (11), and / or the upper end of the at least one electronic unit (12, 13, 14, 15, 16) and / or the component (18) of the patient accommodation ventilation device and / or the at least one cable holder (17) projects at most 1.9 m beyond the bottom plane.

11. The magnetic resonance apparatus according to claim 1 or 2, characterized in that, The upper end of the cooling component (20) of the cold head (19) carrying the cooling device for the main magnet coil (29) is arranged to project less than 1.8 m beyond the bottom plane.

12. The magnetic resonance apparatus according to claim 11, characterized in that, The cooling device operates with a helium quantity of less than 100 liters.

13. The magnetic resonance apparatus according to claim 1 or 2, characterized in that, The lowest point of the vacuum vessel (2) has a height of 0.1 mm to 20 mm beyond the bottom plane.

14. The magnetic resonance apparatus according to claim 1 or 2, characterized in that The highest point of the main magnet unit (1) projects less than 2 m beyond the bottom plane.

15. The magnetic resonance apparatus according to claim 1 or 2, characterized in that, The magnetic resonance device has a basic magnetic field strength of less than 1 T.

16. The magnetic resonance apparatus according to claim 1, characterized in that, The patient accommodation (3) has a diameter of at least 60 cm.

17. The magnetic resonance apparatus according to claim 1, characterized in that, The gradient coil device is arranged so as to surround the patient accommodation (3).

18. The magnetic resonance apparatus according to claim 1, characterized in that, The side of the main magnet unit (1) is an end side.

19. The magnetic resonance apparatus according to claim 1, characterized in that, The at least one reinforcement ring (7) arranged centrally in the longitudinal direction of the main magnet unit is configured to be flatter in an upper side region (9) extending around the highest point of the vacuum vessel (2) and / or in a bottom region extending around the lowest point of the vacuum vessel (2) than in a laterally connected region.

20. The magnetic resonance apparatus according to claim 2, characterized in that, The fastening regions are offset symmetrically in pairs with respect to the vertical central plane of the vacuum vessel (2).

21. The magnetic resonance apparatus according to claim 2, characterized in that, The fastening regions are offset by at least 15 cm in the circumferential direction.

22. The magnetic resonance apparatus according to claim 2, characterized in that, The fastening regions are offset by at least 20 cm in the circumferential direction.

23. The magnetic resonance apparatus according to claim 1 or 2, characterized in that, At least one covering component (24) covering the upper side of the vacuum vessel (2) and extending over at least most of the length of the main magnet unit (1) is designed to be removable independently of other covering components (22, 23) covering the lateral regions.

24. The magnetic resonance apparatus according to claim 7, characterized in that, The at least one suspension device (10) is offset symmetrically in pairs with respect to the vertical central plane of the vacuum vessel (2).

25. The magnetic resonance apparatus according to claim 7, characterized in that, The at least one suspension device (10) is offset by at least 15 cm in the circumferential direction.

26. The magnetic resonance apparatus according to claim 7, characterized in that, The at least one suspension device (10) is offset by at least 20 cm in the circumferential direction.

27. The magnetic resonance apparatus according to claim 8, wherein The engagement opening is an eyelet.

28. The magnetic resonance apparatus according to claim 9, characterized in that, The gradient connection plate (21) is fastened in the side region (11), and / or the upper end of the at least one electronic unit (12, 13, 14, 15, 16) and / or the component (18) of the patient accommodation ventilation device and / or the at least one cable holder (17) projects at most 1.8 m beyond the bottom plane.

29. The magnetic resonance apparatus according to claim 11, characterized in that, The upper end of the cooling component (20) is arranged to project less than 1.5 m beyond the bottom plane.

30. The magnetic resonance apparatus according to claim 11, characterized in that, The cooling component (20) is a turret.

31. The magnetic resonance apparatus according to claim 12, characterized in that, The cooling device operates with a helium quantity of less than 10 liters.

32. The magnetic resonance apparatus according to claim 12, characterized in that, The cooling device operates with a helium quantity of less than 1 liter.

33. The magnetic resonance apparatus according to claim 12, characterized in that, The cooling device operates with a helium quantity of less than 0.1 liter.

34. The magnetic resonance apparatus according to claim 1 or 2, characterized in that, The highest point of the main magnet unit (1) is less than 2 m above the bottom plane when the upper covering part (24) is removed.

35. The magnetic resonance apparatus according to claim 15, characterized in that, The magnetic resonance apparatus has a basic magnetic field strength of less than 0.6 T.

36. The magnetic resonance apparatus according to claim 1 or 2, characterized in that, The height by which the fastening region projects beyond the surface of the vacuum vessel (2) and / or the height by which the at least one reinforcing ring (7) projects beyond the highest point in the upper region (9) and / or the height by which it projects beyond the lowest point in the bottom region is at most 5 cm.

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