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X-ray apparatus with adjusted recording speed, the invention relates to a system and a method for receiving an X-ray image. X-ray machines measure the Rontgenabsorption an examination zone substantially and output them as a picture. X-ray machines are in the medical field, especially in the diagnosis but also to support surgical procedures are used. CT equipment is given to CT devices that provide a three-dimensional and time-resolved imaging of great importance.
Both conventional X-ray machines and CT scanners at the dose of X-rays for the patient as low as possible. In the energy Dose is the energy of the X-ray radiation which is exposed to a patient per kg body weight. At the same time, the image quality is to be optimized, which is often contrary to the objective of the dose minimization. Because a lower dose is usually accompanied with a deterioration in image quality.
So have adult humans for a given study area such as. Thorax on generally higher Rontgenabsorption as children. In order to achieve the same image quality, so a higher dose should be used as a child to an adult human. It is also important for the interpretation of a radiograph that different parts of the body of a patient are shown with a comparable image quality. Therefore, different methods exist to regulate the dosage in function of the Rontgenabsorptionseigenschaften an examination region.
The object is achieved by a system according to claim 1 and by a method according to claim Hereinafter, the inventive solution of the object with respect to the claimed system and in relation to the claimed method is described.
Here, features mentioned advantages or alternative embodiments are also to be transmitted to the other claimed subject and vice versa. In other words, the subject claims can for example, are directed to a system may be further formed with the features described in connection with a method or claimed. The appropriate functional features of the method advertising the case designed by corresponding objective modules. The invention is based on a system for receiving an X-ray image, comprising a receiving unit, adapted to receive an X-ray image of at least a body areas of a patient.
The invention is based on the idea that the system further comprises a control unit adapted for controlling the speed of at least one relative movement between the patient and the receiving unit in dependence of the Rontgenabsorptionseigenschaften of patient body area. The controller includes at least the control of the speed of a patient support along the longitudinal axis of the patient such that the applied dose along the longitudinal axes of the patient is regulated lines.
A variation of the Rontgenabsorptionseigenschaf- th of the male body portion along the longitudinal axis can be compensated according to the invention very simply such that the dose administered to the patient is not unnecessarily high on the one hand and on the other hand, a constant image quality is ensured. According to a further aspect of the invention, the Steue- tion takes place such that the integration time per section of the X-ray image is changing.
Thus, the control can be particularly well adapted to the X-ray absorption properties based on the absorption of X-rays by bone, fat or muscle tissue.
According to a further aspect of the invention, the X-ray absorption characteristics relating to the absorption and scattering of X-rays upon irradiation of the body portion in the anterior-posterior direction or in the posterior-anterior direction. Because the X-ray absorption properties along these directions are particularly easy to measure, for example by means of a topogram.
According to a further aspect of the invention, the system is a computed tomography apparatus, wherein the receiving unit is rotatable about the longitudinal axis, wherein the recording is made at a constant rotational speed of the pickup unit, so that the controller effects control of the pitch. Because when shooting by means of a computed tomography device, it is particularly important because of the plurality of projections when recording a three-dimensional X-ray image, to prevent unnecessary radiation exposure to the patient.
According to a further aspect of the invention, the controller includes the control during the recording of an individual X-ray image, so that the speed of the patient bed is regulated during a single, continuous feed.
In particular, the regulation of the dose due to the control of the intensity of X-radiation and due to the control of the speed of the patient support are independent. According to a further aspect of the invention, the dung inventions proper system comprises a calculation unit adapted to calculate the X-ray absorption characteristics of at least one body region of the patient based on a topogram.
Because using a topogram the X-ray absorption properties can be easy and quick loading expect. According to a further aspect of the invention, the inventive system comprises a calculation unit adapted to calculate the X-ray absorption properties of the body portion during the recording of the X-ray image based on already recorded portions of the X-ray image. Furthermore, the invention process in the implementation of the embodiments of the system according to the invention mentioned here are designed with their respective aspects comprises.
The advantages of the various related to the inventive system aspects of the invention mentioned here extend therefore on the inventive method. Hereinafter, the terms "x-ray" and "image" are used synonymously. Such an image can represent both a surface and a volume. It can be two-dimensional trained and made up of so-called pixels, or it can be formed in three dimensions and from so-called.
Thus, the inclusion of an X-ray image includes fully in particular the inclusion of a plurality of X-ray genproj ections, which can be reconstructed into a three-dimensional image. Such a three-dimensional image can be displayed in the form of a plurality of two-dimensional images, of course, for example in the form of multi-planar reconstructions MPRs. For a single X-ray image is an X-ray image representing a contiguous volume, or a continuous area.
A time series of X-ray images can consist for example of a time series of individual x-ray images. In the following the invention is described in detail with reference to the embodiment illustrated in the figures and explained embodiments.
When taking A of an X-ray image 2 of the patient 3 located on a patient table 6 which is connected to a lying base 4, that it the patient support 6 with the patient 3 wearing. For receiving a three-dimensional CT image A 6 moves the patient support the patient 3 along the longitudinal axis 5 of the patient 3 through the OEF f voltage 10 of the gantry 16 of the CT apparatus 1.
The X-ray absorption of the respectively imaged body portion is thus made measured at different angles, wherein the recording angle is typically the angle between the longitudinal axis 5 of the patent tienten 3 as well as the shortest connection between the longitudinal axis 5 and is considered the x-ray emitter.
In the spiral mode of the pitch p is defined as the ratio of advancement of the patient support 6 per rotation of the recording unit AE the extension of the x-ray fan along the longitudinal axis 5. The choice of the pitch depends on several factors.
Is to be taken with a single intake Spira, a second examination zone with a smaller X-ray absorption, game as examples of the chest, so it is desirable to change the pitch during recording. Because due to the higher X-ray absorption of the abdomen over the thorax of the pitch should be selected low during the recording of the abdomen as during the recording of the thorax.
Other examples of study areas, which often have a different level X-ray absorption, and which continue to be recorded with a single spiral intake regularly, body parts such as head and neck and pelvis and legs.
In the X-ray emitter 8 is typically a X-ray tube; in the X-ray detector 9 is typically a row or a flat detector. Calculation unit BE equipped. Furthermore, the control unit StE is adapted to the intensity of X-ray radiation 17, which is provided by the X-ray emitter 8 to regulate. The calculation unit SU is adapted to the Rontgenabsorpti - onseigenschaften to calculate 13 of the male body portion of the patient 3, for example, using a. Both the control unit and the calculation unit StE BE may be embodied as hardware or software.
Both the control unit and the calculation unit StE BE may be implemented on different computers 18th Thus, the calculation unit BE may be embodied as part of a server, while the control unit StE is formed as part of the medical device. The computer 18 is connected to an output unit 11, and an input unit. On the output unit 11, for example, the X-ray image 2 is displayed.
When entering unit 7 is, for example, a keyboard, a mouse, a so-called touch screen or a microphone for voice input. The system described below is designed to carry out the process described in Fig.
In the following is meant by the dose, the absorbed dose, so the energy of the X-ray radiation 17, which a patient is subjected to 3 per kg of body weight. The control St of the velocity of relative movement is particularly useful in case of heavy patients 3 for the dose regulation. Because for such patients 3 has a relatively high dose should be used to achieve a satisfactory image quality.
Such a high dosage can in principle by increasing the intensity of X-ray radiation 17, in particular by a higher power X-ray tube as X-ray emitter reach. And at a fixed, high speed of the patient bed 6, so a high pitch, the dose required for a certain image quality is often not even reach. Therefore, it is advantageous to dose rationszeit by a higher inte- increase per image portion, so 6 by a reduced rate of the patient bed Furthermore, it is useful to regulate the dose along the longitudinal axis 5 of the patient.
In particular, a value in the dose profile may take into account the exposure of many different angles. The irradiation is usually carried out in a direction perpendicular to the longitudinal axis 5.
The direction of irradiation, the direction of propagation of the X-ray radiation 17 is meant. In this sense, the Rontgenabsorptionseigenschaften can affect the absorption and scattering of X-ray radiation 17 upon irradiation of the body portion in the anterior-posterior direction or in the posterior-anterior direction.
For a recording A of the shoulder or hip area is usually a higher dose than for taking A of the leg portion is necessary.
Such regulation of the dose is achieved by controlling the speed St of the patient support 6 along the longitudinal axis 5 of the patient. With this approach, it is particularly easily possible to achieve a comparable image quality of body regions with different heights Rontgenabsorptionseigenschaften 13 within an X-ray image. In such an embodiment, it may be desirable to consider a simplified reconstruction of the raw data into a three-dimensional X-ray image 2 the pitch constant.
At a reduced speed of advance of the patient 3, e. And the intensity of X-rays 17 can be easily and very quickly, especially periodically controlled. The intensity of the X-rays 17 may be controlled as X-ray emitter 8, for example via the current x-ray tube. A topogram 15 is a two-dimensional X-ray image 2 in the form of an X-ray genproj ection, which is intended to allow the precise examination zone as well as the dose of X-radiation 17 for a three-dimensional CT micrograph calculated.
Therefore, the X-ray absorption properties of the body portion 13 located in the beam path can be measured from a topogram 15 directly. To the X-ray absorption properties sen 13 along two different Ach, for example, to calculate each perpendicular to the frontal and to the sagittal plane, it may also be advantageous to take two topographs 15 of a patient.
The method comprises the recording of a radiograph A 2 at least one of the body portions of a. Further, the method includes the patient 6. In one embodiment of the invention, the Rontgenabsorptionseigenschaften be 13 calculates at least one body region of the patient 3 on the basis of a topogram 15 by means of a calculation unit BE. This calculation B is performed by the Rontgenabsorptionseigenschaften be computed 13 from a portion of the X-ray image 2 continuously.
Furthermore, the Rontgenabsorptionseigenschaften 13 may also be in the form of a signal - to-noise ratio to be determined. Both the calculation of B, the intensity of X-ray radiation 17 and the control St of the speed of the relative movement can be performed so that while recording A is only slightly fluctuating signal - ty to-noise ratio and thus a largely constant Bildquali- be sought. Although the invention in detail by the preferred embodiments is further illustrated and described, the invention is not limited by the disclosed examples one set and other variations can be derived therefrom by the skilled artisan without departing from the scope of the invention.
In particular, method steps can be performed in the other sequences than those stated. Country of ref document: Kind code of ref document: The invention relates to a system and a method for recording an X-ray image. The invention is based on a system for recording A an X-ray image 2 , comprising a recording unit AE , designed for recording A an X-ray image 2 of at least one body region of a patient 3. The invention is based on the concept that the system furthermore comprises a control unit StE , which is designed for the control St of the speed of at least one relative movement between the patient 3 and the recording unit AE depending on the X-ray absorption properties 13 of the body region of the patient 3 , wherein the control St comprises at least the control of the speed of a patient couch 6 along the longitudinal axis 5 of the patient 3 in such a way that the applied dose is regulated along the longitudinal axis 5 of the patient 3.
This has the advantage that control St of the speed allows the regulation of the dose for a given body region of the patient 3 independently of the intensity of the X-ray radiation So have adult humans for a given study area such as Thorax on generally higher Rontgenabsorption as children.
It is an object of the invention to regulate the dose of an X-ray apparatus. It can be two-dimensional trained and made up of so-called pixels, or it can be formed in three dimensions and from so-called be constructed voxels. The calculation unit SU is adapted to the Rontgenabsorpti - onseigenschaften to calculate 13 of the male body portion of the patient 3, for example, using a Topogram