Patient positioning device with sliding layer

Abstract

Patient positioning device for use with a medical imaging device, in particular a magnetic resonance device, wherein the patient positioning device comprises a movable patient table for positioning a patient, wherein the patient positioning device has two contacting surfaces which are moved relative to each other when the patient table is moved, wherein at least one of the two contacting surfaces has a sliding layer.

Description

[0001] The invention relates to a patient positioning device and a medical imaging device, in particular a magnetic resonance device.

[0002] In medical imaging, patient positioning devices are known, on which patients are positioned for the acquisition of measurement data using a medical imaging device. A patient positioning device enables precise and stable positioning of the person being examined during the imaging process, ensuring reproducible measurement data. Furthermore, a movable patient table allows for the optimal positioning of different body regions within the imaging device's field of view. The patient table is typically mounted on a support structure of the patient positioning device, which remains stationary during the table's movement.

[0003] The object of the present invention can be considered to be to provide an improved patient positioning device with a movable patient table. This object is achieved by the features of the independent claims. Advantageous embodiments are described in the dependent claims.

[0004] Accordingly, a patient positioning device for use with a medical imaging device is proposed. The patient positioning device comprises a movable patient table for positioning a patient and has two contacting surfaces that move relative to each other (and, in particular, rub against each other) when the patient table is moved. Specifically, the patient positioning device has two contacting surfaces that move relative to each other when the patient table is moved relative to the medical imaging device. At least one of the two contacting surfaces has a sliding layer. In particular, both of the two contacting surfaces can have a sliding layer, or only one of the two contacting surfaces can. Preferably, the patient positioning device has at least one sliding layer arranged on at least one of the two contacting surfaces.

[0005] Friction can occur between the two surfaces when the patient table moves. This friction can restrict their relative movement. Using at least one sliding layer can ensure free movement.

[0006] The patient table can include a patient positioning surface on which the patient can be positioned. The patient positioning surface can, in particular, be a surface of a cover plate of the patient table. The patient positioning surface can, in particular, be aligned parallel to the two contacting surfaces. Preferably, the two contacting surfaces are aligned parallel to each other. Preferably, when the patient table is moved relative to each other, the two contacting surfaces are moved in a direction of movement (e.g., along a displacement axis) that is aligned parallel to the two contacting surfaces.

[0007] The patient positioning device can include a support structure on which the patient table can be arranged. The support structure can, for example, comprise a frame, in particular a base frame, and / or a substructure. The support structure can, for example, have a frame construction. Preferably, the patient table is movable relative to the support structure.

[0008] Preferably, the patient positioning device is designed to move the patient table relative to the medical imaging device. Advantageously, the movement of the patient table allows a patient positioned on it to be moved within the medical imaging device. For example, the patient positioning device may include a motor to move the patient table. The patient positioning device may also include, for example, rollers arranged between the support structure and the patient table, enabling the patient table to move along the support structure.

[0009] The medical imaging device is preferably a magnetic resonance imaging (MRI) device. However, it can also be, for example, a computed tomography (CT) scanner or another medical imaging device.

[0010] The magnetic resonance device can, in particular, comprise a magnetic unit with a magnetic opening, wherein the patient table can be moved, in particular shifted, into the magnetic opening. The direction of movement (along a displacement axis) can, in particular, be aligned parallel to the longitudinal direction of the magnetic unit. This direction is often also referred to as the z-direction. In the case of a cylindrical magnetic unit, the longitudinal direction can be aligned parallel to the cylinder axis.

[0011] The magnetic unit can, in particular, comprise a main magnet (for generating a main magnetic field), especially a superconducting one, and / or a gradient coil unit (for generating magnetic field gradients). The main magnetic field can, for example, have a strength between 0.5 and 12 Tesla. Furthermore, the magnetic unit can, in particular, comprise a body coil (for transmitting and / or receiving high-frequency signals). Preferably, the main magnet and / or the gradient coil unit and / or the body coil are fixedly installed in the magnetic unit.

[0012] The support structure of the patient positioning device can be permanently fixed to the magnetic unit of the magnetic resonance device. For example, the support structure (like the magnetic unit) can be permanently mounted to the floor. However, it is also conceivable that the patient positioning device is movable, i.e., that it also has a movable support structure.

[0013] Within the context of this disclosure, the term "stationary" may preferably be understood as fixed, immovable and / or non-movable.

[0014] Preferably, the two contacting surfaces have a table-side contact surface; that is, one of the two contacting surfaces is the table-side contact surface. The table-side contact surface is fixed in position relative to a patient positioning surface of the patient table. Preferably, the table-side contact surface has a sliding layer (table-side sliding layer). Preferably, the table-side sliding layer is arranged on the table-side contact surface.

[0015] Preferably, the patient positioning device comprises a high-frequency coil, in particular a local coil. Preferably, the high-frequency coil is configured to transmit high-frequency signals (such as excitation signals for generating magnetic resonance signals) and / or to receive them (such as magnetic resonance signals). The high-frequency coil can, for example, be a spinal coil. The high-frequency coil is preferably arranged within and / or integrated into the patient table. Preferably, the high-frequency coil remains stationary relative to the medical imaging device, in particular the magnetic unit of the magnetic resonance device, during movement of the patient table, particularly in sections.

[0016] Preferably, the high-frequency coil comprises at least one antenna for transmitting and / or receiving high-frequency signals. Preferably, the at least one antenna is arranged on the contact surface on the coil side. Advantageously, this makes it possible to receive magnetic resonance signals with a particularly high signal-to-noise ratio.

[0017] Conventionally, high-frequency coils, especially spinal coils, are usually placed on the patient's positioning surface. This typically results in edges and gaps that can cause problems when cleaning the patient table. By integrating the high-frequency coil into the patient table, the top of the table, particularly the positioning surface, can remain closed. Advantageously, the high-frequency coil is designed to be movable within the patient table. Preferably, the high-frequency coil can be moved along a displacement axis.

[0018] Preferably, the two contacting surfaces have a coil-side contact surface, i.e., one of the two contacting surfaces is the coil-side contact surface. The coil-side contact surface is movable, particularly in sections, relative to the patient support surface of the patient table. Preferably, the coil-side contact surface has a sliding layer (coil-side sliding layer). Preferably, the coil-side sliding layer is arranged on the coil-side contact surface. Preferably, the coil-side sliding layer is a component of the high-frequency coil.

[0019] Preferably, the patient positioning surface and the high-frequency coil are configured to move together, particularly simultaneously and / or in parallel, along a displacement axis in a first section (first movement section). Preferably, the magnetic resonance device further comprises a holding device configured to hold the high-frequency coil in a predetermined position relative to the magnet unit, particularly to lock and / or secure it there, especially when the patient positioning surface is moved (further) along the displacement axis in the second section (second movement section). Advantageously, this holds the high-frequency coil in the predetermined position relative to the magnet unit; that is, the holding device is configured to hold the counterpart in the receiving unit, so that the high-frequency coil is held in the predetermined position relative to the magnet unit.

[0020] Preferably, the second section connects directly to the first section. Preferably, the patient support surface and the high-frequency coil are configured to move together along the displacement axis within the patient acquisition area of ​​the magnetic resonance device in the first section. Preferably, the patient support surface and the high-frequency coil are configured such that in the second section, the patient support surface continues to move along the displacement axis while the high-frequency coil remains stationary.

[0021] The holding device preferably comprises a receiving unit for receiving a counterpart and the counterpart itself. The receiving unit is preferably arranged in a fixed position, particularly immovably, relative to the magnet unit, with the counterpart being connected to the high-frequency coil. The holding device is preferably designed to hold the counterpart in the receiving unit when the patient positioning surface is located in the second section along the axis of displacement.

[0022] Advantageously, the high-frequency coil can be locked in a predetermined position. This predetermined position is preferably a measurement position. The predetermined position is preferably a position suitable for performing a magnetic resonance measurement with the high-frequency coil positioned in that position. In the predetermined position, the high-frequency coil is preferably located in a measurement field where the main magnetic field of the magnetic resonance device exhibits sufficiently high homogeneity. The predetermined position is preferably a position of the high-frequency coil suitable for transmitting and / or receiving high-frequency signals for a magnetic resonance measurement. Advantageously, in the predetermined position, the high-frequency coil covers a reception range for receiving magnetic resonance signals.Preferably, the predetermined position is located near a patient's body part to be measured and / or near the field of view (FOV) of a magnetic resonance imaging (MRI) scan and / or near the isocenter of the MRI scanner. Advantageously, the distance between the field of view and the high-frequency coil and / or between the isocenter and the high-frequency coil is minimal when the high-frequency coil is located in the predetermined position along the displacement axis. For example, the predetermined position along the displacement axis is located in the center of the magnet assembly. Advantageously, magnetic resonance signals with a high signal-to-noise ratio can be acquired with the high-frequency coil when the high-frequency coil is located in the predetermined position.

[0023] By holding the counterpart in the receiving unit, the high-frequency coil is advantageously held in the predetermined position relative to the magnet unit, in particular temporarily fixed. Holding the counterpart in the receiving unit advantageously places the high-frequency coil in the predetermined position relative to the magnet unit. Advantageously, holding the high-frequency coil in the predetermined position includes locking and / or securing the high-frequency coil in the predetermined position. Advantageously, holding the high-frequency coil in the predetermined position prevents movement of the high-frequency coil relative to the magnet unit.

[0024] Preferably, the high-frequency coil is held close to the field of view and / or close to the isocenter of the magnetic resonance device by holding the counterpart in the recording unit. Preferably, in the first movement phase, the high-frequency coil is moved along the displacement axis to the height of a field of view of a magnetic resonance measurement and / or an isocenter of the magnetic resonance device and then held there. Advantageously, by holding the high-frequency coil in the predetermined position with a relatively short high-frequency coil, a relatively large (posterior; located below the patient) measurement area along the displacement axis can be covered; the size of the measurement area then depends in particular on the length of the second movement phase in which the high-frequency coil is held in the predetermined position.

[0025] Advantageously, the fact that the table-side contact surface and the coil-side contact surface are in contact allows for a small distance between the high-frequency coil and the patient positioned on the patient support surface. This small distance enables a high signal-to-noise ratio of the magnetic resonance signals received by the high-frequency coil.

[0026] To ensure contact between the table-side contact surface and the coil-side contact surface, the high-frequency coil can, in particular, comprise an elastic, especially flexible and / or compliant, material. This advantageously presses the coil-side contact surface onto the table-side contact surface.

[0027] This prevents an air gap that would otherwise increase the distance between the cover plate and the high-frequency coil. The elastic material advantageously keeps the high-frequency coil in continuous contact between the cover plate and the coil. This, in turn, advantageously improves image resolution.

[0028] The portion of the patient table comprising the table-side contact surface can advantageously be designed as a cantilevered structure. This portion preferably includes the patient positioning surface. When a patient is positioned on the patient positioning surface, the patient's weight can generate (high) forces that are absorbed by the portion of the patient table comprising the table-side contact surface, for example, a cover plate. Advantageously, this load can be at least partially dissipated by the high-frequency coil via the contacting surfaces (table-side contact surface and coil-side contact surface). Deflection of the portion of the patient table comprising the table-side contact surface can thus be reduced.

[0029] Preferably, the at least one sliding layer, in particular the table-side sliding layer and / or the coil-side sliding layer, has a coefficient of friction of less than 0.3, in particular 0.2. Advantageously, a sliding layer with such a coefficient of friction enables particularly free movement between the two contacting surfaces.

[0030] The coefficient of friction is typically the ratio of frictional force to contact force. Advantageously, a low coefficient of friction can also reduce the wear of the at least one sliding layer. Preferably, the at least one sliding layer comprises Teflon.

[0031] Because the table-side and coil-side contact surfaces rub against each other during movement, electrostatic charging can occur, which can damage electronic components in particular. Advantageously, this electrostatic charge can be dissipated via the table-side sliding layer and / or the coil-side sliding layer. Therefore, at least one sliding layer can advantageously perform other functions besides its sliding function, such as a dissipation function.

[0032] Preferably, at least one sliding layer, in particular the table-side sliding layer and / or the coil-side sliding layer, comprises an ESD material. The ESD material can, for example, be in the form of an ESD film and / or ESD lacquer.

[0033] Advantageously, the ESD material (electrostatic discharge material) safely dissipates static charges to protect sensitive electronic components. The ESD material preferably comprises a plastic, e.g., PETG, ABS, or polycarbonate, to which conductive fillers, e.g., carbon black or graphite, are added.

[0034] Preferably, the at least one sliding layer, in particular the table-side sliding layer and / or the coil-side sliding layer, has a (specific) electrical surface resistance of at least 10 6 Ω, especially 10 7 Ω, especially 10 8 Ω, on. Advantageously, such a sliding layer can dissipate electrical charges not only at the surface, but also particularly effectively throughout the entire volume.

[0035] Preferably, the at least one sliding layer, in particular the table-side sliding layer and / or the coil-side sliding layer, has an electrical surface resistance of at most 10 Ω. 11 Ω, especially 10 10 Ω, especially 10 9 Ω, on.

[0036] Preferably, the at least one sliding layer has an electrical through-resistance that is greater than the electrical surface resistance. Advantageously, this allows electrical charges to be conducted in a controlled manner across the surface of the material to the nearest grounding point, while simultaneously preventing a voltage breakdown that could damage electronic components.

[0037] Furthermore, at least one medical imaging device, in particular a magnetic resonance device, is proposed in conjunction with a patient positioning device as described above.

[0038] Further advantages, features, and details of the invention will become apparent from the exemplary embodiments described below and from the drawings. Corresponding parts are designated with the same reference numerals in all figures.

[0039] They show: Fig. 1-4 a magnetic resonance device with a patient positioning device in various operating states, Fig. 5 a cross-section through a high-frequency coil with a sliding layer.

[0040] In Fig. Figure 1 schematically depicts a magnetic resonance imaging (MRI) device 10 as an exemplary medical imaging device. The MRI device 10 comprises a magnetic unit 11, which has a main magnet 12 for generating a strong and, in particular, time-constant main magnetic field. The MRI device 10 also includes a patient acquisition area 13 for imaging a patient. In this embodiment, the patient acquisition area 13 is cylindrical and is cylindrically surrounded in one circumferential direction by the magnetic unit 11. The patient acquisition area 13 is formed as a bore in the magnetic unit. The MRI device 10 includes a patient positioning device with a support structure 15 and a patient table 16 arranged thereon. The patient table 16 has a cover plate 27 with a patient positioning surface 17 onto which a patient can be placed.The patient table 16 can be moved into and out of the patient receiving area 13 along a displacement axis parallel to the z-axis. Preferably, the part of the patient from which a magnetic resonance image is to be generated is placed in a measurement field 14. The measurement field 14 is typically located in the center of the magnet unit 11. The measurement field 14 is characterized by a particularly homogeneous main magnetic field. High homogeneity of the main magnetic field is particularly necessary to ensure high spatial resolution of the magnetic resonance signals. The field of view (FOV) of the magnetic resonance measurement is preferably located in the measurement field 14. Preferably, the measurement field includes the isocenter of the magnetic resonance device 10.

[0041] The magnet unit 11 further comprises a gradient coil unit 18 for generating magnetic field gradients, which are used for spatial encoding during imaging. The gradient coil unit 18 is controlled by a gradient control unit 19 of the magnetic resonance device 10. The magnet unit 11 also includes a whole-body coil 20, which is permanently integrated into the magnetic resonance device 10. The whole-body coil 20 is controlled by a high-frequency antenna control unit 21 of the magnetic resonance device 10 and transmits high-frequency magnetic resonance sequences into an examination space, which is essentially formed by the patient acquisition area 13, in particular the measurement field 14, of the magnetic resonance device 10. This excites atomic nuclei in the main magnetic field generated by the main magnet 12. Magnetic resonance signals are generated by the relaxation of the excited atomic nuclei.

[0042] The magnetic resonance device 10 further comprises a high-frequency coil 26, which is configured here as a spinal coil, for receiving the magnetic resonance signals. The high-frequency coil 26 is arranged in the patient table 16. It is located below the patient positioning surface 17. The high-frequency coil 26 has a thickness in the y-direction that is significantly smaller (in particular by at least a factor of 5 or at least a factor of 10) than its length in the z-direction. The width of the high-frequency coil 26 would then be its extent perpendicular to the y- and z-directions, i.e., in the viewing direction perpendicular to the plane of the drawing.

[0043] The magnetic resonance device 10 includes a system control unit 22 for controlling the main magnet 12, the gradient control unit 19, and the high-frequency antenna control unit 21. The system control unit 22 centrally controls the magnetic resonance device 10, for example, by performing a predetermined magnetic resonance sequence. The system control unit 22 also includes an evaluation unit (not shown) for evaluating the magnetic resonance signals acquired during the magnetic resonance examination.

[0044] Furthermore, the magnetic resonance device 10 includes a user interface 23, which is connected to the system control unit 22. Control information, such as imaging parameters, as well as reconstructed magnetic resonance images, can be displayed on a display unit 24, for example, on at least one monitor, of the user interface 23 for medical personnel. The user interface 23 also includes an input unit 25, by means of which information and / or parameters can be entered by the medical personnel during a measurement procedure.

[0045] Based on the Fig. 1, Fig. 2, Fig. 3 to Fig. Figure 4 shows that the patient positioning surface 17 and the high-frequency coil 26 in the present example are configured to be moved together in a first section along a displacement axis within the patient reception area 13 of the magnetic resonance device 10, wherein the magnetic resonance device 10 comprises a holding device configured to hold the high-frequency coil 26 in a predetermined position relative to the magnet unit 11 when the patient positioning surface 17 is moved in a second section along the displacement axis. For the sake of clarity, in Fig. 2, Fig. 3 to Fig. 4 on the presentation of some in Fig. 1 of the components shown has been omitted.

[0046] In Fig. In Figure 1, the patient table 16 is in a state where it is maximally retracted. In this state, a patient can be positioned particularly easily on the patient positioning surface 17. The depicted position of the patient table 16 can therefore also be referred to as the patient transfer position. In this position, the high-frequency coil 26 is located in its foremost position within the patient table 16. The distance between the high-frequency coil 26 and the end face of the patient table 16 closest to the magnet is minimal.

[0047] When the patient table 16 is moved through the right opening of the bore into the patient reception area 13, it reaches the point in the Fig. 2 position shown. In this first section of the movement, the high-frequency coil 26 together with the patient support surface 17 is moved in direction R along the displacement axis (parallel to the z-axis), i.e. the relative position of high-frequency coil 26 and patient support surface 17 does not change.

[0048] The high-frequency coil 26 is now in the predetermined position relative to the magnet unit 11, which is characterized here by the fact that the high-frequency coil 26 is located in the measuring field 14 of the magnetic resonance device 10. This position can, in particular, represent the beginning of the scan area of ​​the patient table 16.

[0049] For example, the patient is positioned on the patient positioning surface 17 such that his head is located in the front area of ​​the patient positioning surface 17, i.e., the high-frequency coil 26 is located in the Fig. The position shown in Figure 2 is directly below the patient's head. In this position, magnetic resonance signals can be acquired to generate an MR image of the patient's head. The high-frequency coil 26 is locked in this position by a holding device.

[0050] If the patient support surface 17 (together with the patient) is moved further along the displacement axis in direction R in this second section of the movement, the locking mechanism of the holding device ensures that the high-frequency coil 26 remains stationary relative to the magnet unit 11. However, the patient support surface 17 reaches the position indicated in Fig. Position 3 shown. This position can, in particular, represent the end of the scan area of ​​the patient table 16. Advantageously, a relatively large scan area can be covered with only a relatively short high-frequency coil 26, since the position of the patient on the patient support surface 17 relative to the high-frequency coil 26 is variable.

[0051] When the patient support surface 17 (together with the patient) is moved back along the axis of displacement, but now in the opposite direction R, the locking mechanism of the holding device initially continues to ensure that the high-frequency coil 26 remains stationary relative to the magnet unit 11. Only when the patient support surface 17 reaches the position indicated in Fig. Once the position shown in section 4 is reached, the high-frequency coil 26 is unlocked again, i.e., the high-frequency coil 26 is no longer held in position relative to the magnetic unit 11. After the patient table 16 is moved back a further time, the patient positioning surface 17, together with the high-frequency coil 26, then reaches the position shown in section 4. Fig. 1. Position shown.

[0052] The patient positioning device has two contacting surfaces, namely a coil-side contact surface 28 and a table-side contact surface 29. The coil-side contact surface 28 forms the top of the high-frequency coil 26 and is therefore fixed in position relative to the high-frequency coil 26. The table-side contact surface 29 is a surface of the cover plate 27 opposite the patient positioning surface 17 and is therefore fixed in position relative to the patient positioning surface 17.

[0053] During the movement from the in Fig. 2 shown condition in the in Fig. 3 shown state as well as during the backward movement from the one in Fig. 3 in the in Fig. In the state shown in Figure 4, the coil-side contact surface 28 and a table-side contact surface 29 move relative to each other. More precisely, the high-frequency coil 26 remains stationary with its coil-side contact surface 28, while the cover plate 27 moves with its coil-side contact surface 29. In this example, the coil-side contact surface 28 has a sliding layer 30. However, it is also conceivable that the table-side contact surface 29, or both surfaces 28 and 29, each have a sliding layer. The sliding layer 30 could, for example, comprise Teflon and / or be a Teflon sheet.

[0054] The sliding layer 30 has a positive mechanical effect on the interaction between the high-frequency coil 26 and the cover plate 27. Advantageously, the sliding layer 30 has a low coefficient of friction. This also advantageously reduces wear caused by the friction between the high-frequency coil 26 and the cover plate 27.

[0055] In addition to improved mechanical sliding properties, the sliding layer can also advantageously contribute to the dissipation of electrostatic charge. The sliding layer can, for example, comprise an ESD material. For instance, an ESD film and / or an ESD lacquer can be applied to the table-side contact surface 29 and / or the coil-side contact surface 28.

[0056] Fig.Figure 5 shows a cross-section through a high-frequency coil 26 with the sliding layer 30. Advantageously, at least one antenna of the high-frequency coil 26 is located directly beneath the sliding layer 30. Preferably, an elastic material 31, such as a foam, is located beneath the at least one antenna. The at least one antenna can, for example, be baked into the foam during manufacturing. The high-frequency coil 26 also comprises a coil support structure 32, which here in particular has rollers for movement beneath the cover plate 27.

[0057] Advantageously, the elastic material 31 ensures that no jamming occurs between the high-frequency coil 26 and the cover plate 27. Furthermore, the elastic material 31 ensures that the high-frequency coil 26 and the cover plate 27 are in continuous contact, allowing for a particularly small distance between at least one antenna of the high-frequency coil 26 and a patient positioned on the patient support surface 17. This small distance facilitates the acquisition of magnetic resonance signals with a high signal-to-noise ratio by at least one antenna.

[0058] Advantageously, the high-frequency coil 26 can yield slightly when the cover plate 27 deflects slightly due to the patient's weight. This cushioning means that the patient's weight (the heavier the patient, the greater the deflection of the cover plate 27) does not affect the distance between the high-frequency coil 26 and the cover plate 27. Furthermore, it reduces different vibrations generated by the gradient coil unit 18, which could potentially cause the patient to vibrate at a different frequency than the high-frequency coil 26. This improves image quality.

[0059] The contact between the coil-side contact surface 28 and the table-side contact surface 29 can result in the build-up of electrostatic charge due to the relative movement of the surfaces, as the two surfaces rub against each other. Preferably, the sliding layer 30 is designed to effectively dissipate electrostatic charge.

[0060] Finally, it should be noted once again that the patient positioning device and the magnetic resonance device described in detail above are merely exemplary embodiments which can be modified in various ways by those skilled in the art without departing from the scope of the invention. Furthermore, the use of the indefinite articles "a" or "an" does not preclude the possibility that the features in question may be present multiple times. Likewise, the term "unit" does not preclude the possibility that the components in question consist of several interacting sub-components, which may also be spatially distributed. Regardless of the grammatical gender of a particular term, persons of male, female, or other gender identities are included.

Claims

[1] Patient positioning device for use with a medical imaging device, in particular a magnetic resonance imaging device, wherein the patient positioning device comprises a movable patient table for positioning a patient, wherein the patient positioning device has two contacting surfaces which are moved relative to each other when the patient table is moved, wherein at least one of the two contacting surfaces has a sliding layer. [2] Patient positioning device according to claim 1, wherein the two contacting surfaces have a table-side contact surface which is fixed to a patient positioning surface of the patient table. [3] Patient positioning device according to one of the preceding claims, wherein the two contacting surfaces have a coil-side contact surface which is fixed to a high-frequency coil, in particular a spinal coil. [4] Patient positioning device according to claim 3, wherein the high-frequency coil includes at least one antenna for transmitting and / or receiving high-frequency signals, wherein at least one antenna is arranged on the coil-side surface. [5] Patient positioning device according to one of claims 3 or 4, wherein the high-frequency coil comprises an elastic material that presses the coil-side contact surface against the table-side contact surface. [6] Patient positioning device according to one of the preceding claims, wherein the at least one sliding layer has a coefficient of friction of less than 0.

3. [7] Patient positioning device according to one of the preceding claims, wherein the at least one sliding layer comprises Teflon. [8] Patient positioning device according to one of the preceding claims, wherein the at least one sliding layer comprises an ESD material, in particular an ESD film and / or an ESD varnish. [9] Patient positioning device according to one of the preceding claims, wherein the at least one sliding layer has an electrical surface resistance of at least 10 6 Ω, especially 10 7 Ω, especially 10 8 Ω, exhibits. [10] Patient positioning device according to one of the preceding claims, wherein the at least one sliding layer has an electrical surface resistance of at most 10 11 Ω, especially 10 11 Ω, especially 10 9 Ω, exhibits. [11] Medical imaging device with a patient positioning device according to one of the preceding claims.

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