X-ray diagnosis apparatus and method for creating image data

Abstract

An X-ray diagnosis apparatus and method for creating image data, wherein a plurality of sets of reference image data is created based on projection data obtained from a plurality of imaging directions to the object after an contrast agent is injected to an object, fluoroscopic image data are created based on projection data obtained from a desired imaging direction to the object, and fluoroscopic roadmap image data are created based on the fluoroscopic image data and reference image data whose imaging direction corresponds to the imaging direction of the fluoroscopic image data.

1 . An X-ray diagnosis apparatus, comprising: 
 an X-ray generating unit configured to irradiate an X-ray to an object;    an X-ray detector configured to detect the X-ray irradiated from the X-ray generating unit;    a reference image data creation unit configured to create a plurality of sets of reference image data based on projection data obtained from a plurality of imaging directions to the object after an contrast agent is injected to the object;    a fluoroscopic image data creation unit configured to create fluoroscopic image data based on projection data obtained from a desired imaging direction to the object; and    a fluoroscopic roadmap image data creation unit configured to create fluoroscopic roadmap image data based on the fluoroscopic image data and reference image data whose imaging direction corresponds to the imaging direction of the fluoroscopic image data.    
     
     
         2 . The X-ray diagnosis apparatus according to  claim 1 , further comprising an direction set unit configured to set the plurality of imaging directions of the sets of the reference image data.  
     
     
         3 . The X-ray diagnosis apparatus according to  claim 2 , wherein the direction set unit sets the plurality of imaging directions when an X-ray condition is initially set.  
     
     
         4 . The X-ray diagnosis apparatus according to  claim 2 , wherein the direction set unit sets the plurality of imaging directions in at least one of LAO-RAO direction and CRA-CAU direction.  
     
     
         5 . The X-ray diagnosis apparatus according to  claim 2 , wherein the direction set unit selects the imaging direction of the fluoroscopic image data from the imaging directions of the plurality of sets of the reference image data.  
     
     
         6 . The X-ray diagnosis apparatus according to  claim 2 , wherein the direction set unit sets the at least one imaging direction by rotating a support unit which supports the X-ray generating unit and the X-ray detector.  
     
     
         7 . The X-ray diagnosis apparatus according to  claim 1 , wherein the reference image data creation unit creates DSA image data as the reference image data from mask image data which is obtained before the contrast agent is injected into the object and contrast image data which is obtained after the contrast agent is injected into the object.  
     
     
         8 . The X-ray diagnosis apparatus according to  claim 1 , further comprising a display unit configured to separately display or superimpose the fluoroscopic image data and the fluoroscopic roadmap image data.  
     
     
         9 . The X-ray diagnosis apparatus according to  claim 1 , wherein the fluoroscopic roadmap image data creation unit creates the fluoroscopic roadmap image data by performing subtraction process on the reference image data and the fluoroscopic image data.  
     
     
         10 . A method for creating image data in an X-ray diagnosis apparatus, comprising 
 creating a plurality of sets of reference image data based on projection data obtained from a plurality of imaging directions to the object after an contrast agent is injected to an object;    creating fluoroscopic image data based on projection data obtained from a desired imaging direction to the object; and    creating fluoroscopic roadmap image data based on the fluoroscopic image data and reference image data whose imaging direction corresponds to the imaging direction of the fluoroscopic image data.    
     
     
         11 . The method for creating image data according to  claim 10 , further comprising setting the plurality of imaging directions of the sets of the reference image data.  
     
     
         12 . The method for creating image data according to  claim 11 , wherein the setting is setting the plurality of imaging directions when an X-ray condition is initially set.  
     
     
         13 . The method for creating image data according to  claim 11 , wherein the setting is setting the plurality of imaging directions in at least one of LAO-RAO direction and CRA-CAU direction.  
     
     
         14 . The method for creating image data according to  claim 11 , wherein the setting is selecting the imaging direction of the fluoroscopic image data from the imaging directions of the plurality of sets of the reference image data.  
     
     
         15 . The method for creating image data according to  claim 11 , wherein the setting is setting the at least one imaging direction by rotating a support unit which supports the X-ray generating unit and the X-ray detector.  
     
     
         16 . The method for creating image data according to  claim 10 , wherein the creating of the reference image data is creating DSA image data as the reference image data from mask image data which is obtained before the contrast agent is injected into the object and contrast image data which is obtained after the contrast agent is injected into the object.  
     
     
         17 . The method for creating image data according to  claim 10 , further comprising separately displaying or superimposing the fluoroscopic image data and the fluoroscopic roadmap image data.  
     
     
         18 . The method for creating image data according to  claim 10 , wherein the creating of the fluoroscopic roadmap image data is creating the fluoroscopic roadmap image data by performing subtraction process on the reference image data and the fluoroscopic image data.  
     
     
         19 . An X-ray diagnosis apparatus, comprising: 
 an X-ray generating unit configured to irradiate an X-ray to an object;    an X-ray detector configured to detect the X-ray irradiated from the X-ray generating unit;    a subtraction image data creation unit configured to create subtraction image data from mask image data which is obtained before the contrast agent is injected into the object and contrast image data which is obtained after the contrast agent is injected into the object;    a catheter detection unit configured to detect a position of a catheter in the subtraction image data;    a blood vessel extraction unit configured to extract a blood vessel in the subtraction image data;    a pixel value change unit configured to change a pixel value of at least one pixel which is located on or near a top of the catheter and which is located in the blood vessel.    
     
     
         20 . The X-ray diagnosis apparatus according to  claim 19 , further comprising a moving detection unit configured to detect a moving direction of the catheter.  
     
     
         21 . The X-ray diagnosis apparatus according to  claim 20 , wherein the pixel value change unit changes pixel values of pixels which are located in a predetermined distance from the top of the catheter to the moving direction.  
     
     
         22 . The X-ray diagnosis apparatus according to  claim 21 , wherein the blood vessel extraction unit extracts the blood vessel by a region growing method.  
     
     
         23 . The X-ray diagnosis apparatus according to  claim 21 , wherein the pixel value change unit changes the pixel value according to movement of the catheter.  
     
     
         24 . The X-ray diagnosis apparatus according to  claim 21 , further comprising a classification unit configured to classify the pixels to a plurality of groups, and wherein the pixel values change unit changes the pixel values by each group.