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US 2007/0165769 A1Published application
Tomographic device and method therefor
AssigneeHitachi Medical Corporation
InventorsTaiga Goto, Osamu Miyazaki, Koichi Hirokawa
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AssigneeHitachi Medical Corporation
InventorsTaiga Goto, Osamu Miyazaki, Koichi Hirokawa
Estimating the term…
An image reconstruction area of a subject is divided into a plurality of image data segments, among projection data obtained by projection, projection data segments necessary for back projection processing are cut out for every image data segments and back projection processing is performed for every image data segments by making use of the cut out projection data segments. Further, detector addresses of the projection data to be used for the back projection processing are obtained from a plurality of limited number of detector addresses within the concerned image data segment region. As a result, a device is realized which permits to produce a high quality tomographic image with high speed by using a small amount of a high speed memory.
A tomographic device, which comprises a detecting means which is constituted by arranging a plurality of detector elements in 2-dimension and detects X-rays irradiated to a subject and penetrated through the subject, means for producing the detected data as projection data, a projection data memory means which stores the produced projection data, means for dividing, an image reconstruction area having a predetermined size corresponding to a region of interest of the subject into image data segments having an arbitrary size and an image reconstruction computing means which performs an image reconstruction computing on the divided image data segment regions from the projection data and generates a 3-dimensional tomographic image, wherein the image reconstruction computing means includes an extracting means which extracts from the projection data the projection data segment region necessary for generating the 3-dimensional tomographic image of the image data segment regions, a projection data segment region memory means which stores the extracted projection data segment regions and a 3 dimensional back projection processing means which successively reads out the projection data segment regions stored in the projection data segment region memory means and performs 3-dimensional back projection processing for every respective corresponding image data segments.
A tomographic device, which comprises a detecting means which is constituted by arranging a plurality of detector elements in 2-dimension and detects X-rays irradiated to a subject and penetrated through the subject, means for producing the detected data as projection data, a projection data memory means which stores the produced projection data, means for dividing an image reconstruction area corresponding to a region of interest of the subject into image data segments having an arbitrary size and an image reconstruction computing means which performs an image reconstruction computing on the divided image data segment regions from the projection data and generates a 3-dimensional tomographic image, which further comprises an input means which inputs externally the size of the image reconstruction area to be divided by the dividing means, a display means which displays the projection data together with the position of the divided image data segments and a selecting means which selects externally an arbitrary image data segment region from the projection data displayed together with the position of the image data segments, wherein the image reconstruction computing means includes an extracting means which extracts from the projection data the projection data segment region necessary for generating the 3-dimensional tomographic image of the selected image data segment regions, a projection data segment region memory means which stores the extracted projection data segment regions and a 3 dimensional back projection processing means which successively reads out the projection data segment regions stored in the projection data segment region memory means and performs 3-dimensional back projection processing for every respective corresponding image data segments.
A tomographic method comprising the steps of:
A tomographic deice, in which penetration rays penetrated through a subject are detected by a detecting means constituted by arranging a plurality of detection elements in 2-dimension, image reconstruction computing is performed by an image reconstruction computing means on an image reconstruction area corresponding to a region of interest of the subject based on the detected projection data and a 3-dimensional tomographic image of the region of interest of the subject is generated, wherein the image reconstruction computing means includes a processing means which divides the image reconstruction area into a plurality of image data segment regions, cuts out from the projection data detected by the detection means a projection data segment region necessary for back projecting toward the respective divided image data segment regions and performs a 3-dimensional back projection processing for every respective corresponding image data segment regions by making use of the data of the respective cut out projection data segment regions.
Dependencies are inferred from the claim text.