System and method for aligning a medical object according to a target positioning

Abstract

The invention relates to a system for assisting in aligning a medical object according to a target positioning, comprising a light guiding device, a reflector element and a projection surface, wherein the light guiding device is designed to emit a predefined light distribution, wherein the reflector element is designed to be attached to the medical object in a defined arrangement or wherein the reflector element is integrated into the medical object in the defined arrangement, wherein the reflector element is designed to reflect at least a part of the light distribution in a defined manner with respect to the medical object (MO) when illuminated with the light distribution, the projection surface has a marking, wherein the projection surface and the light guiding device are arranged in a defined positional relationship to each other, whereby the projection surface can be illuminated by the reflected part of the light distribution, where the reflected part of the light distribution illuminates the marker exactly when the medical object is aligned according to the target positioning The invention further relates to a medical device and a method for aligning a medical object according to a target positioning.

Description

The invention relates to a system for assisting in aligning a medical object according to a target positioning, to a medical object and to a method for aligning a medical object according to a target positioning.In the context of minimally invasive interventions, in particular bone interventions, for example vertebroplasts and / or kyphoplasts, a bone trocar, a K-wire, a rigid needle and / or a screw-like tool is often introduced as an intervention instrument into a bone structure of an examination object, in particular by peening and / or drilling. The interventional instrument is often to be guided to a target object via an entry point on the examination object. For this purpose, it is often essential to monitor a positioning, in particular an orientation and / or position, of the interventional instrument with respect to the examination object. Fluoroscopy is often used for intraprocedural navigation and / or guidance of the interventional instrument, for example by means of a C-arm X-ray device. In most cases, planning imaging and / or 3D imaging is not performed in a pre-intervention manner.On the basis of fluoroscopic imaging, for example, a positioning of the interventional instrument and / or an angulation of the C-arm X-ray device can be adapted as required. Alternatively or additionally, the interventional instrument, in particular a direction of longitudinal extent of the interventional instrument, can be detected in the fluoroscopic images and displayed as a graphical representation by superimposing a straight line by means of a representation unit. By iteratively repositioning the interventional instrument under fluoroscopic imaging, the superimposed straight line can be aligned with the target object. The known methods disadvantageously result in an increased radiation load on the examination object. In addition, the methods are often time-consuming. The 2D imaging used has the disadvantage that an alignment of the C-arm must be changed regularly in order to be able to exclude "off-plane" tilting of the trocar. By "off-plane" is meant a portion of the change of a direction vector and / or orientation vector of the shaft of the instrument that is collinear or parallel to the projection direction of the C-arm. This off-plane change of direction is not detectable, or is only detectable with great difficulty, in a 2D X-ray projection in the case of thin, in particular needle- or screw-like, instruments. For example, during a progression view, a change in direction of the interventional instrument outside the plane in the projection direction is to be detected, which cannot be detected on the C-arm without changing to a second, in particular orthogonal, progression view with a different angulation of the C-arm. Too frequent a change in the angulation is a great disadvantage for a surgical workflow.The document DE 10 2023 204 909 B3 discloses a device for aligning a medical object with respect to an examination object, wherein a light distribution illuminates one of a plurality of markings of an alignment element which can be fastened or is integrated on the medical object when the medical object is aligned in accordance with a virtual continuation corresponding to the marking.The publication DE 10 2022 204 859 B3 discloses a device for aligning a medical object with respect to an examination object, comprising an alignment element, a guide element, an auxiliary element and a light guide device which is designed to emit a predefined light distribution for defining a path. In this case, the predefined light distribution can illuminate a recognition mark of the auxiliary element with a predefined light pattern if a guide axis of the alignment element is aligned in a defined positional relationship with respect to the path.It is therefore the object of the present invention to enable an X-ray dose-low and time-efficient alignment of a medical object with respect to an examination object.The object is achieved according to the invention by the subject matter of the independent claims. Advantageous embodiments with expedient refinements are the subject matter of the dependent claims. Regardless of the grammatical sex of a certain term, individuals with male, female or other sex identity are included.In a first aspect, the invention relates to a system for assisting in aligning a medical object according to a target positioning. The system comprises a light guide device, a reflector element and a projection surface. The light guiding device is configured to emit a predefined light distribution. The reflector element is designed to be fastened to the medical object in a defined arrangement. Alternatively, the reflector element is integrated into the medical object in the defined arrangement. Furthermore, the reflector element is designed to reflect at least a part of the light distribution in a defined manner with respect to the medical object when illuminated with the light distribution. The projection surface has a marking. Furthermore, the projection surface and the light guiding device are arranged in a defined positional relationship to one another. In this case, the projection surface can be illuminated by the reflected part of the light distribution. Furthermore, the reflected part of the light distribution illuminates the marking exactly when the medical object is aligned according to the target positioning.The medical object can be a surgical instrument, for example a needle, in particular a puncture needle, and / or a drill, and / or a diagnostic instrument, for example an endoscope, in particular a laparoscope, and / or a catheter, and / or a trocar. Advantageously, the medical object can be at least partially, in particular completely, rigid and elongated, in particular rod- and / or needle-shaped. Advantageously, the medical object, in particular a distal section of the medical object, can be arranged on or in the examination object in the operating state of the device. In particular, the medical object can be arranged at least partially on or in the examination object in the operating state of the device.The light guiding device can advantageously comprise a light source, for example a laser light source, which is designed to emit the predefined light distribution. For this purpose, the light guiding device can comprise an optical aperture, for example. Advantageously, the light guiding device can emit the light distribution in an operating state of the device.The reflector element can be attachable, in particular arrangeable, in a defined positional relationship, in particular in a defined spatial relative position and / or relative orientation and / or relative pose, to the medical object, in particular a proximal section of the medical object. In particular, the reflector element can be detachably attachable to the medical object in the defined positional relationship. For this purpose, the reflector element and / or the medical object can have a fastening element, for example a clamping device and / or a plug-in device and / or a magnet holder. Alternatively, the reflector element can be integrated into the medical object, in particular at a proximal section of the medical object, for example at a surface of the medical object. The reflector element can have an optical reflector, for example a mirror. The reflector can be planar or curved, for example concave or convex. Advantageously, the reflector element can be arranged on the medical object in such a way that the reflector element, in particular the reflector, can be illuminated by the light distribution.Advantageously, the reflector element, in particular the reflector, can be designed to reflect at least a part of the light distribution in a defined manner with respect to the medical object when illuminated with the light distribution. Advantageously, the arrangement of medical object and reflector element can be positioned in the operating state of the system such that the defined light distribution illuminates the reflector element, in particular the reflector. Advantageously, the light distribution can illuminate the reflector element in the operating state of the system at an angle of incidence with respect to a mirror axis of the reflector. The reflector can be configured to reflect the at least part of the predefined light distribution at an angle of incidence with respect to the mirror axis. Due to the defined arrangement of the reflector element with respect to the medical object, the mirror axis of the reflector can have a defined positional relationship with respect to the medical object, in particular a longitudinal extension axis of the medical object.Advantageously, the system can also have a planar or curved projection surface. The projection surface can comprise, for example, a surface, in particular a housing surface, of a medical device and / or of the examination object. Advantageously, the projection surface can have at least one marking. The at least one marking can be designed as a structural and / or anatomical element, for example elevation or recess, and / or as a graphical element, for example print, on the projection surface.Advantageously, the projection surface, in particular the at least one marking, and the light guiding device can be arranged in a defined positional relationship, in particular in a defined spatial relative position and / or relative orientation and / or relative position with respect to one another. This advantageously ensures that the reflected part of the light distribution illuminates the marking on the projection surface corresponding to the target positioning precisely when the medical object, in particular with the reflector element, is aligned according to the target positioning. The target positioning can comprise a spatial target position and / or target orientation and / or target pose of the medical object.The proposed system can advantageously enable an X-ray dose-low and time-efficient alignment of the medical object with respect to the examination object. In particular, an off-plane change in direction of the medical object can be visually detectable.In a further advantageous embodiment of the proposed system, the system can furthermore comprise a medical imaging device. In this case, the light guiding device and the projection surface can be arranged on the medical imaging device in a defined positional relationship to one another and / or can be at least partially integrated into the medical imaging device.The medical imaging device can comprise a medical X-ray device, in particular a medical C-arm X-ray device and / or a cone-beam computed tomography system (CT, CBCT), and / or a computed tomography system (CT system) and / or a magnetic resonance tomography system (MRI system) and / or a positron emission tomography system (PET system) and / or an ultrasound device. Advantageously, the imaging device can be configured to record and provide image data of the examination object and of the medical object.Advantageously, the light guiding device can be arranged on the medical imaging device, for example a source or a detector, and / or integrated into the imaging device. In addition, the projection surface can be arranged on the medical imaging device and / or can be at least partially integrated into the imaging device, for example a housing of the imaging device.This advantageously allows an inherent registration between a coordinate system of the light guide device and a coordinate system of the imaging device, as a result of which a combination of an image-guided alignment and alignment by means of the projected light distribution can be carried out particularly intuitively.In a further advantageous embodiment of the proposed system, the medical imaging device can have an X-ray source and an X-ray detector, which are mounted movably. In this case, the projection surface can be a surface of the X-ray detector facing the X-ray source.Advantageously, the imaging device, in particular the medical X-ray device, can have the X-ray source and the X-ray detector in a defined arrangement with respect to one another, for example on a C-arm. In this case, the defined arrangement of X-ray source and X-ray detector can be mounted movably, for example rotatably and / or translationally.The X-ray detector can have an X-ray sensitive surface for detecting X-rays, in particular for detecting X-ray radiation emitted by means of the X-ray source. Advantageously, the projection surface can be arranged on the same side, in particular surface and / or surface, of the X-ray detector as the X-ray sensitive surface. In particular, the projection surface can be a housing surface of the X-ray detector, which is arranged along a beam path from the X-ray source to the X-ray detector in front of the X-ray sensitive surface of the X-ray detector. In particular, the projection surface can be a surface of the X-ray detector facing the X-ray source, in particular a housing surface.The proposed embodiment can advantageously enable an off-plane change in direction of the medical object to be detected without any alteration, in particular without any alteration of a projection direction between X-ray source and X-ray detector. As a result, in the event of an offline change in direction, which is determined in particular visually, a recording with a rotated angle, in particular a projection direction, can be necessary. Alternatively, the off-plane change of direction can be identified directly in image data recorded by means of the X-ray device in the original alignment.In a further advantageous embodiment of the proposed system, the X-ray source and the X-ray detector can be mounted such that they can be moved about a common isocentre. In addition, the predefined light distribution can illuminate the isocentre.Advantageously, the X-ray source and the X-ray detector, in particular the defined arrangement of X-ray source and X-ray detector, can be mounted movably, in particular rotatably, about the isocentre, in particular a rotation centre. Furthermore, the light guiding device can be configured to emit the defined light distribution in such a way that the isocenter of the medical imaging device can be illuminated by the light distribution. In particular, the light guiding device can emit the light distribution in an operating state of the system in such a way that the light distribution would be able to illuminate the isocentre in the case of uncovered illumination.This advantageously allows at least a section of the medical object to be arranged at the isocenter. This can advantageously make it possible for the section of the medical object to be imageable from a plurality of projection directions, in particular algorithms, by means of the X-ray apparatus. The section of the medical object arranged in the isocenter can furthermore be imaged in a center of the 2D x-ray image that can be recorded by means of the x-ray device. As a result, a spatial distance between the medical object, in particular the section of the medical object arranged in the isocenter, and the X-ray detector and / or the X-ray source can be determined. This makes it possible, for example, to make an improved assumption about a position of a rotation center of a tilt of the medical object during an alignment according to the target positioning.In a further advantageous embodiment of the proposed system, the predefined light distribution can project a geometric shape.Advantageously, the light guiding device can be configured to project a light pattern having the geometric shape by means of the predefined light distribution. In this case, the reflector element can reflect at least a part of the projected light pattern in a defined manner with respect to the medical object when illuminated with the light distribution. In this case, the reflector element can project the reflected part of the light pattern onto the projection surface. The geometric shape can comprise, for example, a line and / or a point and / or a point cloud and / or a cross and / or a circle and / or a polygon.This advantageously allows improved identification as to whether the reflected part of the light distribution illuminates the predefined marking. Furthermore, it can thereby be identified in an improved manner whether the medical object is aligned according to the target positioning.In a further advantageous embodiment of the proposed system, the light guiding device can be designed to emit a further predefined light distribution for illuminating the projection surface, which light distribution projects a further light pattern onto the projection surface in an operating state of the system. In this case, the projection of the further light pattern on the projection surface can form the marking at least partially, in particular completely.The further predefined light distribution can have in particular all properties and features of the predefined light distribution and vice versa. The further light pattern can advantageously comprise a further geometric shape, for example a line and / or a point and / or a point cloud and / or a cross and / or a circle and / or a polygon. Advantageously, the projection of the light pattern, in particular of the geometric shape, on the projection surface can partially, in particular in addition to a marking embodied as a structural and / or anatomical and / or graphical element, or completely form the marking.The proposed embodiment can advantageously enable a flexible adaptation of a positioning and / or form, in particular shape, of the marking on the projection surface. This allows flexible alignment of the medical object according to the respectively predetermined target positioning.In a further advantageous embodiment of the proposed system, the projection surface can have a plurality of markings for in each case one potential target positioning of the medical object. In this case, the reflected part of the light distribution can illuminate exactly the corresponding marking if the medical object is aligned according to the respective target positioning.The plurality of markings can be configured differently or in the same way. Furthermore, the plurality of markings can each have an optically distinguishable property, for example a color coding and / or black-and-white coding and / or a surface condition, for example a reflectivity and / or fluorescence and / or contour. Advantageously, the plurality of markings can be unambiguously identifiable on the basis of the optically distinguishable property. Each of the markings can advantageously correspond to exactly one potential, in particular predefined, target positioning, in particular target position and / or target orientation and / or target pose, of the medical object. The correspondence advantageously consists in the fact that the respective marking of the plurality of markings is illuminated by the reflected part of the light distribution exactly when the medical object is aligned in accordance with the respective target positioning.The proposed embodiment can enable a flexible alignment of the medical object according to the respectively predetermined target positioning.In a further advantageous embodiment of the proposed system, the plurality of markings can form a scale.Advantageously, the plurality of markings can be arranged in a defined arrangement on the projection surface, for example equidistantly or at different distances from one another. In addition, the plurality of markings can have a coding, for example a color coding, and / or inscription, for example angle information. If the markings are formed as straight lines, the markings can advantageously be arranged parallel to one another. In addition, the plurality of markings may have a reference marking with respect to which the remaining markings form a scale of deviations.The proposed embodiment can enable an intuitive alignment of the medical object according to the respective target positioning and a qualitative and / or quantitative detection of a deviation with respect to a reference positioning, in particular corresponding to the reference marking.In a further advantageous embodiment of the proposed system, the reflector element can be designed to be moved along a longitudinal extension direction of the medical object and to be detachably fastened to the medical object in the defined arrangement.Advantageously, the reflector element can be translatable along the longitudinal direction of extension of the medical object and / or rotatable about the longitudinal direction of extension. In addition, the reflector element and / or the medical object can have a fixing element which enables a detachable fastening of the reflector element in the defined arrangement on the medical object.This makes it possible to achieve a simple, in particular subsequent, and situation-adjusted arrangement of the reflector element on the medical object in the defined arrangement.In a second aspect, the invention relates to a medical device comprising a medical object and a reflector element. The reflector element is arranged on the medical object in a defined arrangement or integrated into the medical object in the defined arrangement. In this case, the reflector element is designed to reflect at least a part of the light distribution in a defined manner with respect to the medical object when illuminated with a light distribution.The advantages of the proposed medical object substantially correspond to the advantages of the proposed system. Features, advantages or alternative embodiments mentioned here can likewise also be transferred to the other claimed subject matters and vice versa.In a further advantageous embodiment of the proposed medical device, the medical object can have a distal and a proximal section. The distal section can be configured to be arranged at least partially in an examination object. Furthermore, the proximal section can be configured to be arranged outside the examination object when the distal section is arranged inside the examination object. Furthermore, the reflector element can be arranged on the proximal section.The proximal section can comprise a spatial section of the medical object, which is arranged facing away from the examination object, in particular facing a medical operator for manipulation of the medical object, in particular along a longitudinal extension direction of the medical object. Furthermore, the distal section can comprise a spatial section of the medical object, which is arranged facing the examination object, in particular facing away from a medical operating personnel for manipulation of the medical object, in particular along a longitudinal extension direction of the medical object.In a further advantageous embodiment of the proposed medical device, the reflector element can be designed to be moved along a longitudinal extension direction of the medical object and to be detachably fastened to the medical object in the defined arrangement.In a third aspect, the invention relates to a method for aligning a medical object according to a target positioning. In a first step a), a predefined light distribution is emitted by means of a light guiding device. In this case, the light distribution illuminates a reflector element which is fastened to the medical object in a defined arrangement or is integrated into the medical object in the defined arrangement. In this case, the reflector element reflects at least a part of the light distribution in a defined manner with respect to the medical object. In a second step b), it is checked whether a predefined marking on a projection surface is illuminated by the reflected part of the light distribution. The projection surface and the light guiding device are arranged in a defined positional relationship to one another. If no, the medical object is repositioned and step b) is repeatedly executed.The checking in step b) can be carried out manually, for example by a medical operating personnel, or automatically, for example by means of an optical sensor and / or a camera. If it is determined during the checking in step b) that the predefined marking on the projection surface is illuminated by the reflected part of the light distribution, the method can end at this point. If it is determined during the checking in step b) that the predefined marking on the projection surface is not illuminated by the reflected part of the light distribution, the medical object can advantageously be repositioned, in particular rotated and / or translated, and step b) can be carried out repeatedly. By repositioning the medical object, the relative positioning of the reflector element with respect to the projection surface and the light guide device can change. Advantageously, the repositioning of the medical object and step b) can be carried out repeatedly until the predefined marking on the projection surface is illuminated by the reflected part of the light distribution.The advantages of the proposed method substantially correspond to the advantages of the proposed system. Features, advantages or alternative embodiments mentioned here can likewise also be transferred to the other claimed subject matters and vice versa.In a further advantageous embodiment of the proposed method, the predefined light distribution can project a geometric shape.In a further advantageous embodiment of the proposed method, the light guiding device emits a further predefined light distribution for illuminating the projection surface, which light distribution projects a further light pattern onto the projection surface. Furthermore, the projection of the further light pattern on the projection surface can form the marking at least partially, in particular completely.Exemplary embodiments of the invention are illustrated in the drawings and described in more detail below. In different figures, the same reference numerals are used for the same features. The following are shown: FIGS. 1 to 3 are schematic representations of various embodiments of a proposed system, FIGS. 4 and 5 show schematic representations of various embodiments of markings on a projection surface, FIG. 6 shows a schematic representation of a proposed medical object, FIGS. 7 and 8 show schematic representations of various embodiments of a proposed method for aligning a medical object according to a target positioning.FIG. 1 shows a schematic representation of an advantageous embodiment of a proposed system for assistance in aligning a medical object MO according to a target positioning. The system can include a light guiding device LFE, a reflector element RE and a projection surface PF. The light guiding device LFE can be configured to emit a predefined light distribution LV. In this case, the reflector element RE can be designed to be fastened to the medical object MO in a defined arrangement. Alternatively, the reflector element RE can be integrated into the medical object MO in the defined positional relationship. In addition, the reflector element RE can be designed to reflect at least a part of the light distribution RLV in a defined manner with respect to the medical object MO when illuminated with the light distribution LV. The projection surface PF can have a marking MK. In addition, the projection surface PF and the light guiding device LFE can be arranged in a defined positional relationship to one another. The projection surface PF can be illuminated by the reflected part of the light distribution RLV. In this case, the reflected part of the light distribution RLV can illuminate the marking MK exactly when the medical object MO is aligned according to the target positioning.The medical object MO, in particular a distal section of the medical object MO, can be arranged at least partially on or in an examination object 31 in an operating state of the system. Advantageously, the target positioning can specify a spatial target position and / or target orientation and / or target pose of the medical object MO with respect to the examination object 31.Advantageously, the predefined light distribution LV can project a geometric shape.Advantageously, the reflector element RE can be configured to be moved along a longitudinal extension direction of the medical object MO and to be detachably fastened to the medical object MO in the defined arrangement.FIG. 2 shows a schematic illustration of a further advantageous embodiment of a proposed system for assistance in aligning a medical object MO according to a target positioning. The system can furthermore comprise a medical imaging device, in particular a medical C-arm X-ray device. The X-ray device can have an X-ray source 33 and an X-ray detector 34, which are mounted on a common C-arm 38 in a defined arrangement such that they can be moved about an isocenter IZ. Advantageously, the light guiding device LFE and the projection surface PF can be arranged on the medical imaging device in a defined positional relationship to one another and / or can be at least partially integrated into the medical imaging device. In particular, the light guiding device LFE can be arranged on the X-ray detector 34. Furthermore, the projection surface PF can be a surface of the X-ray detector 34 facing the X-ray source 33. Furthermore, the predefined light distribution LV can illuminate the isocentre IZ.In order to record image data of the examination object 31, the provision unit PRVS can transmit a signal 24 to the X-ray source 33. The X-ray source 33 can then emit an X-ray beam. When the x-ray beam impinges, after interaction with the object under examination 31, on a surface of the detector 34, the detector 34 can transmit a signal 21 to the provision unit PRVS. The provision unit PRVS can acquire the image data set on the basis of the signal 21.Advantageously, the system may further comprise an input unit 42 and a display unit 41. The input unit 42 may comprise, for example, a keyboard and / or a pointing device and / or a detection unit, for example a speech detection unit and / or gesture detection unit. Furthermore, the display unit 41 can comprise, for example, a monitor and / or a display and / or a projector. The input unit 42 can preferably be integrated into the display unit 41, for example in the case of a capacitive and / or resistive input display. The input unit 42 can advantageously be designed to detect a user input. For this purpose, the input unit 42 can send a signal 26 to the provision unit PRVS, for example. The provision unit PRVS can be designed to control the emission of the light distribution LV, in particular on the basis of the user input, for example by means of a signal CS. Furthermore, the provision unit PRVS can be designed to control the X-ray device to record the image data on the basis of the user input.The display unit 41 can advantageously be configured to display a graphical representation of the target positioning and / or a workflow indication and / or the medical image data. For this purpose, the provision unit PRVS can send a signal 25 to the presentation unit 41.FIG. 3 shows a schematic illustration of a further advantageous embodiment of a proposed system for assistance in aligning a medical object MO according to a target positioning. In this case, the light guiding device LFE can be designed to emit a further predefined light distribution FLV for illuminating the projection surface PF, which light distribution in an operating state of the system projects a further light pattern onto the projection surface PF. In this case, the projection of the further light pattern on the projection surface can form the marking MK at least partially, in particular completely.FIG. 4 shows a schematic illustration of a marking MK formed by means of the further light pattern FLV on the projection surface PF.FIG. 5 shows a schematic representation of a plurality of markings MKR, MK 1 and MK 2 on the projection surface PF for a potential target positioning of the medical object MO in each case. In this case, the reflected part of the light distribution RLV can illuminate exactly the corresponding marking if the medical object MO is aligned according to the respective target positioning. As illustrated in FIG. 5, the light guiding device LFE can be arranged on the projection surface PF, in particular the X-ray detector 34. In this case, the light guiding device LFE can comprise a deflection element AE, for example a mirror, which is designed to deflect the predefined light distribution LV in a defined manner.The plurality of markings MKR, MK 1 and MK 2 can be configured differently or in the same way. Furthermore, the plurality of markings MKR, MK 1 and MK 2 can each have an optically distinguishable property, for example a color coding. Advantageously, the plurality of markings MKR, MK1 and MK2 can be unambiguously identifiable on the basis of the optically distinguishable property. Each of the markings MKR, MK 1 and MK 2 can advantageously correspond to exactly one potential, in particular predefined, target positioning of the medical object MO. The correspondence advantageously consists in the fact that the respective marking of the plurality of markings MKR, MK 1 and MK 2 is illuminated by the reflected part of the light distribution RLV exactly when the medical object MO is aligned in accordance with the respective target positioning. Advantageously, the plurality of markings MKR, MK 1 and MK 2 can be arranged in a defined arrangement on the projection surface PF, for example equidistantly or at different distances from one another. If the markings MKR, MK1 and MK2 are formed as straight lines, the markings can advantageously be arranged parallel to one another. In addition, the plurality of markings can have a reference marking MKR, with respect to which the remaining markings MK 1 and MK 2 form a scale of deviations.FIG. 6 shows a schematic representation of a proposed medical device, comprising a medical object MO and the reflector element RE. In this case, the reflector element RE can be integrated into the medical object in a defined arrangement or arranged on the medical object MO in the defined arrangement. Furthermore, the reflector element RE can be designed to reflect at least a part of the light distribution in a defined manner with respect to the medical object MO when illuminated with a light distribution LV. Advantageously, the medical object can have a distal and a proximal section. The distal section can be designed to be arranged at least partially in an examination object 31. Furthermore, the proximal section can be configured to be arranged outside the examination object 31 when the distal section is arranged inside the examination object 31. In this case, the reflective element RE can be arranged on the proximal section. In particular, the reflector element RE can be configured to be moved along a longitudinal extension direction of the medical object MO and to be detachably fastened to the medical object MO in the defined arrangement, for example by means of a fixing element FE.FIG. 7 shows a schematic representation of an advantageous embodiment of a proposed method for aligning a medical object MO according to a target positioning. In a first step, the predefined light distribution LV can be emitted PROJ-LV by means of the light guiding device LFE. In this case, the light distribution LV can illuminate the reflector element RE, which is fastened to the medical object MO in a defined arrangement or is integrated into the medical object MO in the defined arrangement. Furthermore, the reflector element RE can reflect at least a part of the light distribution RLV in a defined manner with respect to the medical object MO. In a further step, it is possible to check CHK whether a predefined marking on the projection surface PF is illuminated by the reflected part of the light distribution RLV. The projection surface PF and the light guiding device LFE can be arranged in a defined positional relationship to one another. In the case of N, the medical object MO repositioned RPOS-MO and the checking CHK can be carried out repeatedly.The schematic representations contained in the described figures do not depict any scale or size relationships.Finally, it is pointed out once again that the methods described in detail above and the devices illustrated are merely exemplary embodiments which can be modified in a wide variety of ways by the person skilled in the art without departing from the scope of the invention. Furthermore, the use of the indefinite article "a" or "an" does not exclude that the features in question can also be present multiple times. Likewise, the terms "unit" and "element" do not exclude that the components in question consist of a plurality of interacting part-components, which may optionally also be spatially distributed.The expression "based on" can be understood in the context of the present application in particular in the sense of the expression "using". In particular, a formulation that is created (alternatively: determined, determined, etc.) according to a first feature based on a second feature does not exclude that the first feature can be created (alternatively: determined, determined, etc.) based on a third feature.

Claims

System for assistance in aligning a medical object (MO) according to a target positioning, comprising a light guiding device (LFE), a reflector element (RE) and a projection surface (PF), wherein the light guiding device (LFE) is designed to emit (PROJ-LV) a predefined light distribution (LV), wherein the reflector element (RE) is designed to be fastened to the medical object (MO) in a defined arrangement or wherein the reflector element (RE) is integrated into the medical object (MO) in the defined arrangement, wherein the reflector element (RE) is designed to reflect at least a part of the light distribution in a defined manner with respect to the medical object (MO) when illuminated with the light distribution (LV), wherein the projection surface (PF) has a marking (MK), wherein the projection surface (PF) and the light guiding device (LFE) are arranged in a defined positional relationship to one another, wherein the projection surface (PF) can be illuminated by the reflected part of the light distribution (RLV), wherein the reflected part of the light distribution (RLV) illuminates the marking (MK) exactly when the medical object (MO) is aligned according to the target positioning.The system according to claim 1, further comprising a medical imaging device, wherein the light guiding device (LFE) and the projection surface (PF) are arranged on the medical imaging device in a defined positional relationship to each other and / or are at least partially integrated into the medical imaging device.The system according to claim 2, wherein the medical imaging device comprises an X-ray source (33) and an X-ray detector (34), which are movably mounted, wherein the projection surface (PF) is a surface of the X-ray detector (34) facing the X-ray source (33).The system according to claim 3, wherein the X-ray source (33) and the X-ray detector (34) are movably mounted about a common isocentre (IZ), wherein the predefined light distribution (LV) illuminates the isocentre (IZ).The system according to any of the preceding claims, wherein the predefined light distribution (LV) projects a geometric shape.System according to one of the preceding claims, wherein the light guiding device (LFE) is designed to emit a further predefined light distribution (FLV) for illuminating the projection surface (PF), which light distribution projects (PROJ-FLV) a further light pattern onto the projection surface (PF) in an operating state of the system, wherein the projection of the further light pattern on the projection surface (PF) forms the marking (MK) at least partially, in particular completely.The system according to any one of the preceding claims, wherein the projection surface (PF) comprises a plurality of markings (MK1, MK2, MKR) for a respective potential target positioning of the medical object (MO), wherein the reflected part of the light distribution (RLV) exactly illuminates the corresponding marking when the medical object (MO) is aligned according to the respective target positioning.The system of claim 7, wherein the plurality of markings (MK1, MK2, MKR) form a scale.The system according to any one of the preceding claims, wherein the reflector element (RE) is configured to be moved along a longitudinal extension direction of the medical object (MO) and to be detachably fastened to the medical object (MO) in the defined arrangement.Medical device, comprising a medical object (MO) and a reflector element (RE), wherein the reflector element (RE) is arranged in a defined arrangement on the medical object (MO) or is integrated into the medical object (MO) in the defined arrangement, wherein the reflector element (RE) is configured to reflect at least a part of the light distribution in a defined manner with respect to the medical object when illuminated with a light distribution (LV).Medical device according to claim 10, wherein the medical object (MO) has a distal and a proximal section, wherein the distal section is configured to be arranged at least partially in an examination object (31), wherein the proximal section is configured to be arranged outside the examination object (31) when the distal section is arranged inside the examination object (31), wherein the reflector element (RE) is arranged on the proximal section.Medical device according to claim 10 or 11, wherein the reflector element (RE) is configured to be moved along a longitudinal extension direction of the medical object (MO) and to be detachably fastened to the medical object (MO) in the defined arrangement.Method for aligning a medical object (MO) according to a target positioning, comprising: a) emitting (PROJ-LV) a predefined light distribution (LV) by means of a light guiding device (LFE), wherein the light distribution (LV) illuminates a reflector element (RE) which is fastened to the medical object (MO) in a defined arrangement or is integrated into the medical object (MO) in the defined arrangement, wherein the reflector element (RE) reflects at least a part of the light distribution in a defined manner with respect to the medical object (MO), b) checking (CHK) whether a predefined marking (MK) on a projection surface (PF) is illuminated by the reflected part of the light distribution (RLV), wherein the projection surface (PF) and the light guiding device (LFE) are arranged in a defined positional relationship to one another, wherein the medical object (MO) is repositioned (RPOS-MO) in the case of one another (N) and step b) is carried out repeatedly.The method of claim 13, wherein the predefined light distribution (LV) projects a geometric shape.Method according to Claim 13 or 14, wherein the light guiding device (LFE) emits a further predefined light distribution (FLV) for illuminating the projection surface (PF), which light distribution projects a further light pattern onto the projection surface (PF), wherein the projection of the further light pattern on the projection surface (PF) forms the marking (MK) at least partially, in particular completely.

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