Patent Number: 
Section: claims

1. An X-ray image photographing apparatus having: a photographing portion having an image obtaining portion for obtaining a distribution of X-ray having transmitted through an object, and can mount a grid unit including at least a grid for removing scattered rays from the object;  a grid detection system for obtaining information from said grid unit or by using said grid unit, and detecting at least one of presence or absence of the grid, a kind of the grid and presence or absence of replacement of the grid; and  a control portion for executing photographing or image processing on the basis of at least the result of the detection by said grid detection system. 2. The apparatus of  claim 1 , wherein said control portion having: claim 1 an image-processing system for image-processing and outputting image data collected by said image obtaining portion; and  a memory portion preserving therein parameters used in said image processing system;  wherein said image processing system selects at least one of said parameters preserved in said memory portion on the basis of at least the result of the detection by said grid detection system and executes image processing. 3. The apparatus of  claim 1 , wherein further having: claim 1 an image analyzing portion for effecting determination of a kind of the grid, on the basis of at least the result of the detection by said grid detection system, by analyzing image data obtained by said image obtaining portion with the grid fixed. 4. The apparatus of  claim 1 , wherein the detection by said grid detection system is effected when the grid unit is mounted on said photographing portion. claim 1 5. The apparatus of  claim 1 , wherein said image obtaining portion has a semiconductor sensor. claim 1 6. The apparatus of  claim 1 , wherein said image obtaining portion has a fluorescent material sheet. claim 1 7. The apparatus of  claim 1 , wherein said grid detection system has a switch member which effects switching corresponding to a shape of a predetermined region of said grid unit, and at least one of presence or absence of said grid, a kind of the grid and presence or absence of replacement of the grid is detected by the switching of said switch member. claim 1 8. The apparatus of  claim 1 , further having: claim 1 an inputting portion by which photographing information as to which portion of the object is photographed is input;  wherein said control portion having a judging portion for judging the propriety of the adaptation of the grid on the basis of at least the photographing information input by said inputting portion and the result of the detection by said grid detection system. 9. The apparatus of  claim 8 , wherein said control portion further having a grid memory portion preserving therein information of an applicable grid corresponding to the photographing information. claim 8 10. The apparatus of  claim 8 , further having a display portion for displaying the result of the judgment of said judging portion. claim 8 11. An X-ray image photographing apparatus having: sensor means for obtaining a distribution of X-ray having transmitted through an object;  housing means for housing said sensor means, and can mount a grid unit including at least a grid for removing scattered rays from the object;  grid detecting means for obtaining information from said grid unit or by using said grid unit to thereby detect at least one of presence or absence of the grid, a kind of the grid and presence or absence of replacement of the grid; and  control means for executing photographing or image processing on the basis of at least the result of the detection by said grid detection means. 12. The apparatus of  claim 11 , wherein said control means having: claim 11 image processing means for determining an image processing parameter on the basis of at least the result of the detection by said grid detection means for image data collected by said sensor means and executing image processing. 13. The apparatus of  claim 11 , wherein further having: claim 11 image analyzing means for effecting determination of a kind of the grid, on the basis of at least the result of the detection by said grid detection means, by analyzing image data obtained by said sensor means with the grid fixed. 14. The apparatus of  claim 11 , wherein the detection by said grid detection means is effected when the grid unit is mounted on said housing means. claim 11 15. The apparatus of  claim 11 , wherein said grid detection means having switch means which effects switching correspondingly to a shape of a predetermined region of said grid unit, and at least one of presence or absence of the grid, a kind of the grid and presence or absence of replacement of the grid is detected by the switching of said switch means. claim 11 16. The apparatus of  claim 11 , further having: claim 11 input means for inputting photographing information as to which portion of the object is photographed;  wherein said control means having judging means for judging the propriety of the adaptation of the grid on the basis of at least the photographing information input by said input means and the result of the detection by said grid detection means. 17. The apparatus of  claim 16 , further having display means for displaying the result of the judgment of said judging means. claim 16 18. A grid device for use in an X-ray image photographing apparatus having: a grid;  a frame holding said grid; and  information providing means provided on said frame, said information providing means being designed to provide information concerning at least one of presence or absence of the grid, a kind of the grid and presence or absence of replacement of the grid to said X-ray image photographing apparatus. 19. The device of  claim 18 , wherein said information providing means has a projection for operating a micro switch provided on said X-ray image photographing apparatus. claim 18 20. The device of  claim 18 , wherein said grid is made movable relative to said frame. claim 18 21. An X-ray image photographing apparatus having: a photographing portion having an image obtaining portion for obtaining a distribution of X-ray having transmitted through an object, and can mount a grid unit including at least a grid for removing scattered rays from the object;  a grid detection system detecting at least one of presence or absence of the grid, a kind of the grid and presence or absence of replacement of the grid; and  an image processing system for determining an image processing parameter concerning at least one of gain correction, frequency processing, contrast processing and image compression on the basis of at least the result of the detection by said grid detection system for image data obtained by said image obtaining portion and executing image processing.