DE102022210016A1 - Procedure for taking an X-ray - Google Patents

Abstract

The invention relates to a method (1) for recording an X-ray image of an examination area of an examination object (54) using an X-ray system, having the steps:
a. Generating (2) volume information of the examination area by means of a camera system, in particular an optical one,
b. Determining (3) a recording trajectory for at least one X-ray source for recording the examination area by means of a plurality of projection recordings, recorded with an X-ray source that can be moved independently of an X-ray detector and the assigned X-ray detector,
c. determining (4) a dose curve for the uptake trajectory based on the volume information,
i.e. Recording (5) the x-ray recording by means of the plurality of projection recordings using the dose curve and the recording trajectory.

Description

The invention relates to a method for taking an X-ray image and an X-ray system, a computer program product and a computer-readable medium for it.

New X-ray systems such as a robotic X-ray system with a ceiling-mounted X-ray detector and a ceiling-mounted X-ray source offer the possibility of 3D imaging by moving to flexible trajectories. The course and recording parameters are typically programmed in advance and can be selected by the user. The problem with such 3D trajectories is that the selected parameters are mostly fixed for a procedure and are not adapted to the person or region to be examined. As a result, incorrect, unfavorable recording parameters or high dose exposure or losses in image quality can occur.

Modern radiography systems often have a tomosynthesis option, for example for lung images or for joints and fractures. These scans are always performed in the vertical direction on the Bucky Wall Stand (BWS) and always along the direction of the table when lying down. The problem with such tomosynthesis scan directions is that they are unfavorable for specific clinical questions. For example, for a recording along the spine (e.g. between 2 vertebral bodies), an overlay by other bone structures that lie above (or in front of) the spine is problematic.

Another problem is that today's systems (at the table or thoracic spine) only allow symmetrical scans, which is unfavorable for clinical questions of specific body regions, such as examinations of the shoulder joint (right, left).

In a large number of X-ray examinations, there is a change in the spatial arrangement of the radiation source/detector system in relation to the patient. Examples of this are tomosynthesis, but also topogram recordings. Dose control that is not able to calculate the correct dose for the next X-ray image quickly enough on the basis of the X-ray image area currently recorded can be problematic. A similar problem occurs in tomosynthesis. Due to the continuous change in angle relative to the examination object, its thickness through which radiation passes also changes continuously. However, it is known from analogue tomography technology that a uniform detector dose distribution is advantageous.

It is the object of the invention to specify a method for taking an X-ray image, an X-ray system, a computer program product and a computer-readable medium which enable improved dose calculation for an individual examination subject.

The object is achieved according to the invention by a method for taking an x-ray exposure according to claim 1, an x-ray system according to claim 13, a computer program product according to claim 14 and a computer-readable medium according to claim 15.

• - Erzeugen einer Volumeninformation des Untersuchungsbereichs mittels eines, insbesondere optischen, Kamerasystems,
• - Bestimmen oder Auswählen einer Aufnahmetrajektorie zumindest für eine Röntgenquelle zur Aufnahme des Untersuchungsbereichs mittels einer Mehrzahl von Projektionsaufnahmen, aufzunehmen mit einer unabhängig von einem Röntgendetektor beweglichen Röntgenquelle und dem zugeordneten Röntgendetektor,
• - Ermitteln eines Dosisverlaufs für die Aufnahmetrajektorie basierend auf der Volumeninformation,
• - Aufnehmen der Röntgenaufnahme mittels der Mehrzahl von Projektionsaufnahmen unter Verwendung des Dosisverlaufs und der Aufnahmetrajektorie.

The invention relates to a method for taking an x-ray image of an examination area of an examination object using an x-ray system, having the steps:

• - Generation of volume information of the examination area by means of a camera system, in particular an optical one,
• - determining or selecting a recording trajectory at least for one x-ray source for recording the examination area by means of a plurality of projection recordings, recorded with an x-ray source that can be moved independently of an x-ray detector and the associated x-ray detector,
• - Determination of a dose profile for the recording trajectory based on the volume information,
• - Recording the X-ray recording by means of the plurality of projection recordings using the dose curve and the recording trajectory.

The X-ray system can be a robotic X-ray system or an X-ray system with a table plus a radiation stand. The X-ray detector can be arranged in the table or on the wall unit. The detector may be fixed or longitudinally movable, particularly in fluoroscopic imaging. The method can also be used in the field of mammography.

The volume information can in particular be three-dimensional information, in particular a radiation length/path, depth information or surface information. If necessary, information about the material of the examination area from the organ program (air, soft tissue, bone) can be used. The course of the dose for the recording trajectory can also be referred to as dose modulation.

The recording trajectory can be designed at least for an x-ray source, possibly for an x-ray detector (if movable). X-ray detector and X-ray sources can in particular be movable independently of one another, in particular in contrast to a CT or C-arm system. The X-ray detector can be more or less fixed (BWS), moveable only in one axis (table), or moveable with several degrees of freedom (detector stand). The X-ray source can be tilted or moved.

According to one aspect of the invention, the x-ray exposure is a tomosynthesis exposure, a slot scan exposure, a composite x-ray exposure or a mammography exposure. The x-ray can be taken in particular in the longitudinal direction of the patient. The radiograph can be an orthograph or an image within an exposure. The X-ray can be a mammogram.

According to one aspect of the invention, the volume information is generated by means of the camera system when an at least provisional recording trajectory, in particular the x-ray source, is executed.

According to one aspect of the invention, the determination of the course of the dose is also based on a previous recording by means of the x-ray source and the x-ray detector. The pre-recording can be recorded at a starting position and/or 0 degree position and optionally combined with volume information. The pre-recording can be a prior recording from database. The pre-recording can be a dummy pre-recording from a database or look-up table or similar.

According to one aspect of the invention, in the recording step, the course of the dose is continuously adapted based on the projection recordings.

According to one aspect of the invention, a dose change occurs at landmarks that can be derived from the volume information. For example, this can be done with a slot scan or a similar recording in the area of the pelvis, shoulder or neck.

According to one aspect of the invention, an X-ray image with a horizontally running image trajectory is recorded with a standing examination object. For example, a tomosynthesis image of vertebrae, a slot scan of the hip, a 3D image of the hip or knee. The recording trajectory can be parallel to the floor or perpendicular to the longitudinal axis of the patient or the body part. The horizontal recording can take place in addition to or instead of a vertical recording, in particular on the ESPE. Alternatively, the examination object can be examined or recorded lying down.

Method according to claim 7, wherein the z-position for the horizontally extending acquisition trajectory is adjusted by means of a previous acquisition. The z-position can in particular relate to the longitudinal axis of the patient or examination subject.

According to one aspect of the invention, the focal plane (y) for an X-ray exposure is adjusted based on a previous exposure or on which volume information is adjusted. In particular, the previous image can be used to select the focal plane, especially in the case of spinal curvatures such as scoliosis.

According to one aspect of the invention, an optical recording of the camera system and the X-ray recording are displayed together.

In accordance with one aspect of the invention, an area outside of a region of interest (ROI) is masked out in a representation of the radiograph. Fading out can be based on image post-processing or collimator setting when recording (e.g. depending on the angle).

According to one aspect of the invention, an energy-resolving, in particular a multi-layer or photon-counting, X-ray detector is used. For example, a material decomposition or a dual energy technique can be used.

The problem or problems can be solved by using a depth camera to take a series of optical recordings of the examination object during a calibration movement corresponding to the system movement, which can be assigned to the series of X-ray recordings using the geometric information of the system. This allows the system to preserve the shape and position of the front of the object. The back of the object can rest on the table or lean against a support. The position of the table top / support is known to the system. From this, the length of the object to be penetrated can be calculated.

Since the optical information is already available in advance, the dose modulation to be applied can also be calculated in advance.

The patient can be "calibrated" before the actual X-ray exposure, in particular a slot scan exposure. This means that the user, with the help of the laser line on the X-ray emitter - which shows the central beam level - first approached the upper end of the recording area and then the lower end of the recording area and make it known to the system (in this case by pressing a button). During the necessary movement in between, a series of pictures can be taken with the above-mentioned depth camera, which - similar to a panorama picture with relevant smartphones or digital cameras - can be put together to form an overall picture. From this and with the help of the known geometry information of the system, the transitions between legs - hips or torso - neck are already known in advance and the dose can be increased or decreased accordingly at these points.

If the calibration step can be automated, the camera data used for the calibration can also be used for the dose calculation. When calculating the dose modulation, it may also be advantageous to combine one or more X-ray advances with the optical camera series.

An advance X-ray is in principle capable of determining the exposure parameters of an exposure well. Due to the fact already mentioned above that the thickness to be irradiated changes greatly during tomosynthesis (20° inclination corresponds to +6.4% more length), this means that the required dose - depending on the depth of the patient - increases significantly in some cases (in the example above with a patient of 30cm by approx. +56%). If the course of the irradiated thickness is known before the X-ray series is recorded, the necessary dose modulation or dose distribution can be calculated accordingly in advance.

In an assumed workflow for a tomosynthesis, the area to be irradiated can be collimated orthogonally to the patient's surface with the help of the light localizer. The system can then move to the start position of the X-ray series. During this movement, the series of depth camera data can be recorded. If no advance X-rays were taken before the movement, the necessary dose curve can be modeled from the depth information of the camera, assuming an examination object consisting mainly of one material and the total dose to be applied (e.g. in units of an electrical charge = mAs).

If an advance shot was taken at the beginning of the movement to the starting position, the optimal dose below 0° can be calculated with the help of this, from which the total dose can then be deduced. Alternatively, of course, the total dose can also be distributed over the entire exposure series in this way. If another advance shot is taken at the starting position, the course of the dose can be further optimized with the additional knowledge. For workflow reasons, the course of the dose would be mirrored in the case of a symmetrical trajectory, but there is nothing fundamentally wrong with running the entire trajectory in advance.

Furthermore, it is also possible not to precalculate the dose distribution completely before the beginning of the X-ray series, but to make the existing knowledge of the depth profile of the usual dose control available as a further source of information and thus to speed up the control.

As an alternative to the methods described above using a depth camera, several (e.g. two) conventional 2D cameras can also be used, for example. With the help of e.g. the two images that observe the patient from two sides of the collimator, the depth information can be estimated / calculated. Furthermore, the "shape" of the patient, which is required for the dose modulation, can also be obtained by a room camera approach and calculation of an "avatar" of the patient.

• - Aufnahmeparameter und/oder die genauen Trajektorien von 3D Scans können über einen 3D-Kamera Kalibrierlauf (RGB, Tiefenbildinformation) für die diagnostische Fragestellung ermittelt/angepasst werden.
• - Aufnahmeparameter und/oder die genauen Trajektorien von 3D Scans können über 3D-Raum-Kameras für die diagnostische Fragestellung ermittelt/angepasst werden.
• - Die optimale Position frei beweglicher (z.B. deckengehängter) Detektoren können für 3D über einen 3D-Kamera Kalibrierlauf (RGB, Tiefenbildinformation) für die diagnostische Fragestellung ermittelt werden.
• - Die Informationen des 3D-Kamera Kalibrierlaufes können (in Echtzeit) mit gespeicherten Avatarinformationen und Sollpositionen abgeglichen werden und Hinweise zur Aufnahmeoptimierung über eine Repositionierung des Patienten dem Anwender mitgeteilt werden.
• - 3D-Kamerainformationen können zur Bestimmung der Aufnahmeparameter eines Röntgenbildes allein oder zusammen mit Röntgen-Preshot-Aufnahmen verwendet werden.
• - Tomosynthesescans am BWS können der diagnostischen Fragestellung angepasst auch horizontal, also in einer Höhenebene, erfolgen. Zur Bestimmung der Höhe vor dem Scan kann eine 3D Kamera, ein Körpermodell (Avatar) oder ein Preshot oder eine Kombination verwendet werden.
• - Horizontale oder (zum Objekt) asymmetrische Tomosynthesescans am BWS oder am Tisch vertikal zur Tischrichtung können beispielhaft durch einen deckengehängten Strahler ausgeführt werden.
• - Für Horizontale oder (zum Objekt) asymmetrische Tomosynthesescans können dem Radiologen oder Benutzer sowohl die Röntgendaten als auch die Kameradaten zur besseren Visualisierung der geometrischen Anordnung und Scanrichtung bereitgestellt werden.
• - Preshot-Aufnahmen können gezielt zur Anpassung/Kontrolle der z-Position genutzt werden. Zusammen mit den Kamerainformationen kann ggf. eine Feinjustage erfolgen.
• - Preshot-Aufnahmen können gezielt zur Anwahl/Kontrolle der Schärfeebene y, z.B. bei einer Skoliose genutzt werden.
• - In einer weiteren Ausführung können für freie 3D-Trajektorien und Tomosynthesescans sogenannte Multi-Layer Detektoren, mit mehreren, energieabhängigen Scintillatorschichten verwendet werden, um gezielt Weichteil- und Knocheninformation zu trennen oder zu überlagern.
• - Es können bei einer Tomosynthese gezielt Bereiche, die außerhalb der Region of Interest liegen, wie beispielhaft vorgelagerte Knochen des Brustkorbs, bei einer Wirbelsäulenuntersuchung, bei einer Bilddaten-Rekonstruktion ausgeblendet werden.

The X-ray procedure can enable person-specific 3D trajectories and tomosynthesis scans. The following embodiments can be included:

• - Recording parameters and/or the exact trajectories of 3D scans can be determined/adjusted via a 3D camera calibration run (RGB, depth image information) for the diagnostic question.
• - Recording parameters and/or the exact trajectories of 3D scans can be determined/adjusted via 3D room cameras for the diagnostic question.
• - The optimal position of freely movable (eg ceiling-mounted) detectors can be determined for 3D via a 3D camera calibration run (RGB, depth image information) for the diagnostic issue.
• - The information from the 3D camera calibration run can be compared (in real time) with saved avatar information and target positions, and the user can be given information on how to optimize the recording by repositioning the patient.
• - 3D camera information can be used alone or together with X-ray preshot images to determine the exposure parameters of an X-ray image.
• - Tomosynthesis scans on the thoracic spine can also be performed horizontally, i.e. in one height level, adapted to the diagnostic question. To determine the height before the scan can a 3D camera, a body model (avatar) or a preshot or a combination can be used.
• - Horizontal or (to the object) asymmetrical tomosynthesis scans on the BWS or on the table vertical to the direction of the table can be carried out, for example, by a radiator suspended from the ceiling.
• - For horizontal or (to the object) asymmetrical tomosynthesis scans, the radiologist or user can be provided with both the X-ray data and the camera data for better visualization of the geometric arrangement and scan direction.
• - Preshot recordings can be used specifically to adjust/control the z-position. If necessary, a fine adjustment can be made together with the camera information.
• - Preshot recordings can be used specifically to select/check the focal plane y, eg in the case of a scoliosis.
• - In a further embodiment, so-called multi-layer detectors with several energy-dependent scintillator layers can be used for free 3D trajectories and tomosynthesis scans in order to selectively separate or overlay soft tissue and bone information.
• - In a tomosynthesis, areas that are outside the region of interest, such as the bones in front of the thorax, in a spinal column examination, in an image data reconstruction, can be hidden in a targeted manner.

With the help of this invention, the existing dose budget of a series of exposures can be utilized much better, in that areas with high absorption receive more dose than areas with lower absorption. In addition, doses can also be saved in this way, since the entire patient is not exposed to the same dose for each exposure, which may not be required at all for this part of the body. Furthermore, with this method (especially with slot scan images), the patient's "geometry" can already be known before the measurement (above all the extent in the lateral and dorsoventral orientation). Thus, for the following series of images - even without an X-ray advance - the patient's "size" can be determined. corresponding recording program (S, M, L or XL) can be selected. In addition, the program can be changed between frontal and lateral exposure based on the data. In tomosynthesis, this method can be used to ensure that projections that are recorded at a large angle are sufficiently exposed and contribute to the final image formation.

The advantage of person-specific 3D trajectories and tomosynthesis scans is that recording and scanning parameters of 3D trajectories can be individually adjusted, the organ dose can be reduced, the image quality can be optimized and improved, the scan trajectories can be optimized by 3D camera calibration runs and the diagnostic accuracy can be increased by asymmetric tomosynthesis scans and by scan trajectories vertical to the table length.

• - ein Kamerasystem zum Erzeugen einer Volumeninformation des Untersuchungsbereichs,
• - eine Bestimmungseinheit zum Bestimmen einer Aufnahmetrajektorie zur Aufnahme des Untersuchungsbereichs mittels einer Mehrzahl von Projektionsaufnahmen und einer beweglichen Röntgenquelle in Verbindung mit einem zugeordneten Röntgendetektor,
• - eine Ermittlungseinheit zum Ermitteln eines Dosisverlaufs für die Aufnahmetrajektorie basierend auf der Volumeninformation,
• - eine Aufnahmeeinheit zum Aufnehmen der Röntgenaufnahme mittels der Mehrzahl von Projektionsaufnahmen unter Verwendung des Dosisverlaufs und der Aufnahmetrajektorie.

The invention also relates to an X-ray system for carrying out a method according to the invention, having:

• - a camera system for generating volume information of the examination area,
• - a determination unit for determining a recording trajectory for recording the examination area by means of a plurality of projection recordings and a movable x-ray source in connection with an associated x-ray detector,
• - a determination unit for determining a dose profile for the recording trajectory based on the volume information,
• - a recording unit for recording the X-ray recording by means of the plurality of projection recordings using the dose curve and the recording trajectory.

The determination unit can allow user input. The determination unit can access a database with previous recordings or dummy recordings or the like.

The invention also relates to a computer program product with a computer program that can be loaded directly into a memory device of a control device of an X-ray system according to the invention, with program sections to carry out all the steps of a method according to the invention when the computer program is executed in the control device of the X-ray system.

The invention also relates to a computer-readable medium on which program sections that can be read and executed by a computer unit are stored in order to carry out all the steps of a method according to the invention when the program sections are executed by the X-ray system according to the invention.

• 1 schematisch eine Darstellung eines erfindungsgemäßen Verfahrens;
• 2 schematisch eine Darstellung eines erfindungsgemä-ßen Röntgensystems in einer ersten Ausführungsform;
• 3 schematisch eine Darstellung einer erfindungsgemä-ßen horizontalen Aufnahmetrajektorie;
• 4 schematisch eine Darstellung einer erfindungsgemä-ßen Anpassung der Schärfeebene; und
• 5 schematisch eine Darstellung eines erfindungsgemä-ßen Röntgensystems in einer zweiten Ausführungsform;

Exemplary embodiments of the invention are explained in more detail below with reference to drawings. This shows:

• 1 a schematic representation of a method according to the invention;
• 2 a schematic representation of an X-ray system according to the invention in a first embodiment;
• 3 a schematic representation of a horizontal recording trajectory according to the invention;
• 4 a schematic representation of an inventive adjustment of the focal plane; and
• 5 a schematic representation of an X-ray system according to the invention in a second embodiment;

• - Erzeugen 2 einer Volumeninformation des Untersuchungsbereichs mittels eines, insbesondere optischen, Kamerasystems,
• - Bestimmen 3 einer Aufnahmetrajektorie zumindest für eine Röntgenquelle zur Aufnahme des Untersuchungsbereichs mittels einer Mehrzahl von Projektionsaufnahmen, aufzunehmen mit einer unabhängig von einem Röntgendetektor beweglichen Röntgenquelle und dem zugeordneten Röntgendetektor,
• - Ermitteln 4 eines Dosisverlaufs für die Aufnahmetrajektorie basierend auf der Volumeninformation,
• - Aufnehmen 5 der Röntgenaufnahme mittels der Mehrzahl von Projektionsaufnahmen unter Verwendung des Dosisverlaufs und der Aufnahmetrajektorie.

The 1 shows an exemplary embodiment of a method 1 according to the invention for taking an X-ray image of an examination area of an examination object using an X-ray system, having the steps:

• - Generation 2 of volume information of the examination area by means of a camera system, in particular an optical one,
• - Determination 3 of a recording trajectory for at least one X-ray source for recording the examination area by means of a plurality of projection recordings, recorded with an X-ray source that can be moved independently of an X-ray detector and the associated X-ray detector,
• - Determining 4 a dose profile for the recording trajectory based on the volume information,
• - Recording 5 the X-ray recording by means of the plurality of projection recordings using the dose curve and the recording trajectory.

The x-ray exposure can be a tomosynthesis exposure, a slot scan exposure, a composite x-ray exposure or a mammography exposure. An optical recording of the camera system and the X-ray recording can be displayed together.

When executing an at least provisional recording trajectory, in particular of the x-ray source, the volume information can be generated by means of the camera system. The determination of the course of the dose can also be based on a previous recording by means of the x-ray source and the x-ray detector. In the recording step, the course of the dose can be continuously adjusted based on the projection recordings. A dose change can take place at landmarks that can be derived from the volume information.

With a stationary examination subject, an X-ray image can be recorded with a horizontal recording trajectory. The z-position for the horizontal recording trajectory can be adjusted by means of a pre-recording. The focal plane (y), e.g. in the y-direction, can be adjusted for an X-ray image based on a previous image or on the volume information.

An area outside of a region of interest (ROI) can be hidden in a representation of the radiograph. An energy resolving, in particular a multilayer or photon counting, X-ray detector can be used.

The 2 shows an exemplary embodiment of an X-ray system 49 according to the invention in a first embodiment with a movable X-ray source 52 which can be moved along the recording trajectory 59. The examination subject can be placed on the patient table 60 . A recording, in particular a tomosynthesis scan, can be carried out on the table in a body plane, preferably vertical to the body axis. The recording can be asymmetrical, for example for joints. The recording parameters can be determined using the camera or together with pre-shot recordings.

The 3 shows an exemplary embodiment of a horizontal recording trajectory 11 according to the invention. For example, for a recording along the spine (e.g. between 2 vertebral bodies), a horizontal scan while standing or lying makes more sense, since overlapping by other bone structures that lie above (or in front of) the spine can be reduced. The horizontal recording trajectory 11 is shown schematically in an X-ray recording 10 . A vertical recording trajectory 12 is also shown schematically for comparison.

The 4 shows an exemplary embodiment of an adjustment of the focal plane according to the invention. A pre-recording, if necessary in connection with a camera recording, can be used to determine the focal plane 16 in the y-direction and the symmetry axis 15 of the tomoscan (eg in the case of a question of back pain in the lumbar region).

• - ein Kamerasystem 57 zum Erzeugen einer Volumeninformation des Untersuchungsbereichs,
• - eine Bestimmungseinheit 56 zum Bestimmen einer Aufnahmetrajektorie zur Aufnahme des Untersuchungsbereichs mittels einer Mehrzahl von Projektionsaufnahmen und einer beweglichen Röntgenquelle in Verbindung mit einem zugeordneten Röntgendetektor,
• - eine Ermittlungseinheit 58 zum Ermitteln eines Dosisverlaufs für die Aufnahmetrajektorie basierend auf der Volumeninformation,
• - eine Aufnahmeeinheit 52, 53 zum Aufnehmen der Röntgenaufnahme mittels der Mehrzahl von Projektionsaufnahmen unter Verwendung des Dosisverlaufs und der Aufnahmetrajektorie.

The 5 shows an exemplary embodiment of an X-ray system 49 according to the invention in a second embodiment, having:

• - a camera system 57 for generating volume information of the examination area,
• - a determination unit 56 for determining a recording trajectory for recording the examination area by means of a plurality of projection recordings and a movable x-ray source in connection with an associated x-ray detector,
• - a determination unit 58 for determining a dose profile for the recording trajectory based on the volume information,
• - a recording unit 52, 53 for recording the x-ray recording by means of the plurality of projection recordings using the dose curve and the recording trajectory.

The x-ray system 55 can include a control device 55 which includes a determination unit 56 and a determination unit 58 . The examination object 54 can be arranged in an upright position between the x-ray detector 53 and the x-ray source 52 . A camera system 57 can be arranged on the x-ray source 52 . The X-ray source 52 is connected to a rail system 51 by means of a ceiling mount 50 . The X-ray detector 53 is connected to a rail system 51 by means of a ceiling mount 50 .

Although the invention has been illustrated in detail by the preferred embodiment, the invention is not limited by the disclosed examples and other variations can be derived therefrom by those skilled in the art without departing from the scope of the invention.

Claims (15)

Method (1) for taking an X-ray image of an examination area of an examination object (54) by means of an X-ray system, having the steps: a. Generating (2) volume information of the examination area by means of a camera system, in particular an optical one, b. Determining (3) a recording trajectory for at least one X-ray source for recording the examination area by means of a plurality of projection recordings, recorded with an X-ray source that can be moved independently of an X-ray detector and the assigned X-ray detector, c. determining (4) a dose curve for the uptake trajectory based on the volume information, i.e. Recording (5) the x-ray recording by means of the plurality of projection recordings using the dose curve and the recording trajectory. procedure after claim 1 , wherein the x-ray exposure is a tomosynthesis exposure, a slot scan exposure, a composite x-ray exposure or a mammography exposure. Method according to one of the preceding claims, wherein the volume information is generated by means of the camera system when an at least provisional recording trajectory, in particular of the x-ray source, is carried out. Method according to one of the preceding claims, wherein the determination of the dose profile is also based on a pre-recording by means of the x-ray source and the x-ray detector. Method according to one of the preceding claims, wherein in the recording step the dose profile is continuously adapted based on the projection recordings. Method according to one of the preceding claims, wherein a dose change takes place at landmarks which can be derived from the volume information. Method according to one of the preceding claims, in which an X-ray image with a horizontally running image trajectory is recorded with a standing examination object. procedure after claim 7 , where the z-position for the horizontal recording trajectory is adjusted by means of a previous recording. Method according to one of the preceding claims, wherein the focal plane for an X-ray exposure is adjusted based on a previous exposure or on the volume information. Method according to one of the preceding claims, wherein an optical recording of the camera system and the X-ray recording are displayed together. A method according to any one of the preceding claims, wherein a region outside a region of interest is masked out in a representation of the radiograph. Method according to one of the preceding claims, wherein an energy-dissolving, esp a multilayer, or photon-counting, X-ray detector is used. X-ray system (49) for performing a method according to any one of the preceding claims, comprising: a. a camera system (57) for generating volume information of the examination area, b. a determination unit (56) for determining a recording trajectory for recording the examination area by means of a plurality of projection recordings and a movable X-ray source in connection with an associated X-ray detector, c. a determination unit (58) for determining a dose profile for the recording trajectory based on the volume information, i.e. a recording unit (52, 53) for recording the X-ray recording by means of the plurality of projection recordings using the dose curve and the recording trajectory. Computer program product with a computer program which is directly stored in a memory device of a control device of an X-ray system Claim 13 is loadable, with program sections to all the steps of a method according to one of Claims 1 until 12 to be carried out when the computer program is executed in the control device of the X-ray system. Computer-readable medium on which readable and executable program sections are stored by a computer unit in order to perform all the steps of a method according to one of Claims 1 until 12 execute when the program sections of the X-ray system Claim 13 to be executed.

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