Abstract:
The invention relates to a device for taking high energy images, in particular, X-ray images, comprising an input image by means of which data for a medical auxiliary may be inputted into the device. Said medical auxiliaries are preferably stents or contrast agents which can be introduced into the body of a patient. The display unit of the device can thus be correspondingly set for the applied auxiliary.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application is the US National Stage of International Application No. PCT/EP2005/050248, filed Jan. 20, 2005 and claims the benefit thereof. The International Application claims the benefits of German application No. 10 2004 004 626.3 DE filed Jan. 29, 2004, both of the applications are incorporated by reference herein in their entirety. 
     FIELD OF INVENTION 
     The invention relates to a device for taking a high energy image of an object under examination into which an adjuvant can be inserted, said device comprising an imaging unit for taking the high energy image and a control unit which controls the recording of the high energy image. 
     The invention further relates to a method for taking a high energy image. 
     BACKGROUND OF THE INVENTION 
     A device and method of this kind are known from DE 198 09 738 A1. The device disclosed here is an x-ray diagnostic device having a control unit for preadjusting the aperture settings required for taking the image. The control unit has direct access to a data memory containing patient data and can also access an organ program memory containing default aperture setting values. The disclosed device is also able to determine the size of the organ under examination from patient-related data and set the optimum aperture value using servo motors. 
     The disclosed device is particularly suitable for examination of the lung in a digital pulmonary workstation. 
     X-ray equipment is also well-known for its use in angiography systems which are used among other things to insert devices known as stents into coronary vessels in a cardiological context. Stents are medical adjuvants generally consisting of short metal tubes with a reticulated wall structure. They can be expanded using balloon catheters. Expanding the balloon catheter inserted in a coronary vessel also causes the coronary vessel to be dilated. After removal of the balloon catheter from the coronary vessel, the expanded stents ensure that the coronary vessel remains dilated. The stents are inserted and aligned using the x-ray angiography systems. 
     Reliably detecting stents in angiographic examinations is a major technical challenge, particularly in radioscopy mode. As the stents are made by different manufacturers, they differ markedly in respect of material used and mechanical design, which makes it difficult to adjust the angiography system such that both the stent and the surrounding tissue are clearly discernible to medical personnel. The challenges for detecting stents will increase still further with what are known as drug eluting stents (DES), because the DES are coated with a material designed to prevent restenosis of the coronary vessel. These additional coatings make it even more difficult to detect the stents in the x-ray image. In addition, stents made of biodegradable material are being developed. Such a stent is the so-called Igaki-Tamai stent made of poly-L-lactic acid. Such stents made of biodegradable material are difficult to show with sufficient contrast in x-ray images. 
     SUMMARY OF THE INVENTION 
     Proceeding from this prior art, the object of the invention is to specify a device and a method for taking high energy images enabling adjuvants present in the object under examination to be displayed with good quality. 
     This object is achieved according to the invention by a device and a method having the features set forth in the independent claims. Advantageous embodiments and developments are detailed in the dependent claims. 
     The device for taking high energy images has a control unit to which data relating to the medical adjuvant can be fed via an input device. The control unit is then able to set operating parameters of the imaging unit according to the adjuvant data in such a way that the high energy image taken reproduces both the adjuvant disposed inside the object under examination and the adjacent area with sufficient clarity. The device therefore eliminates the laborious process of searching for optimum settings for the imaging unit. Instead, knowledge already available about the nature of the imaging object is used to set the imaging unit accordingly. 
     In a preferred embodiment, the device is a device for taking a high energy image of a patient&#39;s body region into which a medical adjuvant such as a stent or contrast agent has been inserted. By entering the data relating to said medical adjuvant, the imaging unit can be adjusted by the control unit in such a way that the high energy images clearly show both the medical adjuvant and the adjacent regions of the body of the patient being examined. 
     In a further preferred embodiment, the device is equipped with a scanner with which adjuvant data can be read in from the adjuvant&#39;s packaging. The advantage of this embodiment is that data transfer is automatic, which eliminates human error when entering data. 
     In another preferred embodiment, the data relating to the adjuvant is stored in a memory which the control unit can access. The corresponding data record is then selected by entering a code identifying the adjuvant and the associated data record. With this embodiment it is therefore unnecessary to re-input the data record required for setting the imaging unit each time, thereby reducing the susceptibility to error. 
     In one embodiment it is additionally provided to combine data relating to the adjuvant with the data of the object under examination and to derive manipulated variables which are influenced both by the patient data and by the adjuvant data. 
     In response to a user input, the device can preferably be placed in an operating condition in which the device takes the adjuvant data into account for adjusting the imaging unit. Such an embodiment of the device facilitates user guidance, as the new operating condition must be deliberately selected by the user in cognizance of the particular details. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Further features and advantages of the invention will emerge from the following description in which exemplary embodiments of the invention are explained in detail with reference to the accompanying drawings in which: 
         FIG. 1  shows a block diagram of an x-ray system set up to display medical adjuvants; 
         FIG. 2  shows a block diagram illustrating the control of the x-ray system according to  FIG. 1 ; and 
         FIG. 3  shows a flowchart of a method for recording medical adjuvants and adjacent tissue. 
     
    
    
     DETAILED DESCRIPTION OF INVENTION 
       FIG. 1  shows an x-ray system  1  having a radiation source  2 . The radiation source  2  comprises, for example, a high voltage generator and an x-ray emitter with different coiled filaments, beam apertures and various radiation filters. The radiation source  2  sends x-radiation (not shown in  FIG. 1 ) to an x-ray detector  3  which is, for example, a flat-panel detector with additional dose measurement. The recording of the x-ray image is influenced using control data  4  on the part of the x-ray detector  3 . In particular, after the start of recording, the radiation characteristics of the radiation source  2  are re-adjusted as a function of the x-radiation received by the x-ray detector  3 , as the weight or size of a patient is only to a limited extent a measure of the x-radiation to be expected. Therefore, at the start of recording, an initial setting is generally used and re-adjusted as recording proceeds. 
     The taking of the x-ray image causes image data  5  to be generated in the x-ray detector  3  and this data is transferred to an image processing unit  6 . The image processing unit  6  can contain both arithmetic elements for pre- and post-processing of the image data  5  and data or image memories. 
     The x-ray system  1  is controlled by means of a system controller  7  which exchanges data with the radiation source  2 , the x-ray detector  3  and the image processing unit  6  via a data bus  8 . 
     To the data bus  8  there is additionally connected a display unit  9  which forms a functional entity with the input device  10 . The display unit can be a monitor, for example. The input device is typically a keyboard or control panel. To the input device  10  there is connected a scanner  11  with which an identification code indicated on the packaging of a stent or contrast agent can be scanned in. Depending on the identification code scanned in, an associated set of system parameters can be selected by the system controller  7  from a database  12  likewise connected to the data bus  8  and transferred to the radiation source  2 , the image processing unit  6 , the x-ray generator  3  or the system controller  7 . This is indicated by dashed lines  13  in  FIG. 1 . 
     It should be noted that the identification code of the particular stent or contrast agent can also be entered manually via the input device  10 . It is also possible for the relevant identification code to be obtained from an electronic patient file via a network interface. 
     A wide variety of data concerning the stent present or contrast agent used can be stored in the database  12 . For stents, such data could include the manufacturer (“Medtronic”), the name (“S670”), the type (“slotted tube”), the length (“9/12/15/18/24/30 mm”), the diameter (“3.0/3.5/4.0 mm”), the thickness of the individual struts (“0.128 mm-0.154 mm”), the profile (“1.1 mm”), the surface area (“17-23%”), the foreshortening (“3%”) and other data. Optimum parameter values of the x-ray system  1  can be assigned to the stored characteristics for the stents or contrast agent used. Said parameter values relate, for example, to the high voltage used, the current, the focus used, the aperture setting, the recording time, the absorbers used in the radiation source  2  as well as other parameters of the image processing unit  6 . 
     It is additionally possible, as shown in  FIG. 2 , to combine the parameter values stored in the database  12  for the x-ray system  1  with parameters which are assigned to different types of patients. 
     According to  FIG. 2 , system setpoint values  16  and patient data  17  as well as actual system values  18  are applied to a dose control circuit  14  and image quality control circuit  15 . The resulting manipulated variables  19  are combined in a combining unit  20  to form a common manipulated variable  21 , the combining in said combining unit  20  being accomplished using lookup tables, characteristic curves or neural networks. 
     The system parameters  13  which are assigned to the adjuvants present, stents or contrast agents, are applied to another dose control circuit  22  and another image quality control circuit  23 . The dose control circuit  22  and image quality control circuit  23  produce manipulated variables  24  which are combined in a combining unit  25  to form a common manipulated variable  26 . Like the combining of the manipulated variables  19  in the combining unit  20 , the combining of the manipulated variables  24  can take place via lookup tables, characteristic curves or neural networks. The manipulated variables  21  and  26  are combined in a combining unit  27  to form a manipulated variable  28 . Into the manipulated variable  28  therefore go the values of the system parameters  13 , the system setpoint values  16  and the patient data  17 . As the patient data  17  and the employed adjuvants to be imaged are known to the x-ray system  1 , the x-ray system  1  can be set such that both the adjuvant used, i.e. a stent or contrast agent, and the adjacent tissue of the patient under examination are clearly discernible by the physician on the x-ray image produced. 
     Note that in some circumstances a plurality of system parameters  13  must be combined for imaging a plurality of stents. This can be done by prioritizing or weighting. 
     The patient data  17  can be complex data records containing not only the patient&#39;s thickness but also his height, weight and girth. In addition, the patient data  17  can include typical or specific organ values. 
     The x-ray system  1  is typically operated as shown in  FIG. 3 . First patient data is entered  29 . This can be done manually by the user. However, the data fed in during entry  29  can also be scanned in or transferred via a medical data network using relevant formats, e.g. the DICOM format. This is followed by inputting  30  of the identification code of the medical adjuvant used. For example, the stent identification can be scanned in from the packaging of the stent using a barcode reader. It is additionally possible to input the stent identification manually to the x-ray system  1  via an input device  10 . Another possibility is to transfer the stent identification from an electronic patient file. 
     Then an angiographic examination  31 , for example, is carried out. Optionally an optimized operating condition of the x-ray system  1  for recording the medical adjuvant can be activated by an activation process  32 . When the angiographic examination  31  has been carried out, the x-ray images obtained during the angiographic examination  31  are stored  33 . 
     Using the x-ray system  1 , medical adjuvants such as stents, contrast agents, catheters or heart pacemaker electrodes together with the adjacent tissue can be displayed with high contrast. This can be implemented irrespective of the type and nature of the medical adjuvant used. The x-ray system  1  is equipped with the necessary intelligence to produce both sharp and contrasty images of the area of interest of the patient under examination that are adapted to suit the medical situation. 
     In conclusion, it should be pointed out that the use of an x-ray system  1  of the type described here is not limited to cardiological purposes. Rather the principles described here are also transferable to other types of x-ray systems.