US20030007595A1 - Method of reconstructing a tomogram of an x-ray apparatus - Google Patents
Method of reconstructing a tomogram of an x-ray apparatus Download PDFInfo
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- US20030007595A1 US20030007595A1 US10/053,875 US5387502A US2003007595A1 US 20030007595 A1 US20030007595 A1 US 20030007595A1 US 5387502 A US5387502 A US 5387502A US 2003007595 A1 US2003007595 A1 US 2003007595A1
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- tomogram
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- transmission image
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- 0 C1*(C2)C1CC1C2C*CCC1 Chemical compound C1*(C2)C1CC1C2C*CCC1 0.000 description 2
- BTEOBRCCEOXRIA-UHFFFAOYSA-N C1C2=C1CC(CC1)C1[IH]2 Chemical compound C1C2=C1CC(CC1)C1[IH]2 BTEOBRCCEOXRIA-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B42/00—Obtaining records using waves other than optical waves; Visualisation of such records by using optical means
- G03B42/02—Obtaining records using waves other than optical waves; Visualisation of such records by using optical means using X-rays
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/04—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
- G01N23/046—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material using tomography, e.g. computed tomography [CT]
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2223/00—Investigating materials by wave or particle radiation
- G01N2223/40—Imaging
- G01N2223/419—Imaging computed tomograph
Definitions
- the present invention relates generally to X-ray apparatuses, and more particularly to a method of reconstructing a tomogram of an X-ray apparatus to obtain a three-dimensional image from X-ray images.
- FIG. 1 is a schematic diagram showing a photographing operation of a conventional X-ray apparatus.
- an X-ray irradiator 10 irradiates X-rays to a subject 30 at positions A, B, C and D on a first circular orbit.
- an X-ray detector 20 is rotated in conjunction with the X-ray irradiator 10 around a second circular orbit having the same central axis as the first circular orbit. Accordingly, the X-ray detector 20 detects X-rays which have been transmitted through the subject 30 at positions A 1 , B 1 , C 1 and D 1 on the second circular orbit. Images detected by the X-ray detector 20 at the positions A 1 , B 1 , C 1 and D 1 are illustrated in FIG. 2.
- the conventional X-ray apparatus constructs a target image 40 of a cross section, that is, a desired focal plane 32 , by overlapping a vertical transmission image E and a plurality of slant transmission images obtained by detecting the X-rays which have been transmitted through the subject 30 at positions A 1 , B 1 , C 1 and D 1 .
- the conventional X-ray apparatus of FIG. 1 is disadvantageous in that a long period of time is required to obtain a tomogram, and the precision of the apparatus deteriorates because images are obtained while an X-ray irradiator and an X-ray detector are moved in conjunction with each other to obtain the tomogram from these images.
- the present invention has been made in view of the above problem, and it is an object of the present invention to provide a method of reconstructing a tomogram of an X-ray apparatus, which improves precision and reduces a required period of time to obtain a desired tomogram from a subject.
- the present invention provides a method of reconstructing a tomogram of an X-ray apparatus, obtaining model information of a subject; obtaining a transmission image of the subject; reconstructing a tomogram based on the transmission image and the model information; and displaying the reconstructed tomogram.
- FIG. 1 is a schematic diagram showing the photographing operation of a conventional X-ray apparatus
- FIG. 2 is a view showing an image processing process
- FIG. 3 is a schematic diagram showing the structure of an X-ray apparatus in accordance with the present invention.
- FIG. 4 is a block diagram showing the control mechanism of the X-ray apparatus of the present invention.
- FIG. 5 is a view showing a method of reconstructing a tomogram of the X-ray apparatus of the present invention
- FIG. 6 is a flow chart showing obtaining of model information for use in the tomogram reconstructing method of the present invention.
- FIG. 7 is a flow chart showing the tomogram reconstructing method of the present invention.
- FIG. 8A is a view showing an example in which the tomogram reconstructing method of the present invention is applied to an actual subject.
- FIG. 8B is view showing another example in which the tomogram reconstructing method of the present invention is applied to another actual subject.
- FIG. 3 is a schematic diagram showing the structure of the X-ray apparatus in accordance with the present invention.
- the X-ray apparatus of the present invention comprises a loading table 110 which supports a subject 120 , an X-ray irradiator 130 which irradiates X-rays to the subject 120 placed on the loading table 110 , an image intensifier 140 which converts X-rays transmitted through the subject 120 into a visible image, an image selection unit 150 which selects a specific region from the image converted by the image intensifier 140 , and a photographing unit 160 which obtains the image of the specific region selected by the image selection unit 150 .
- X-rays irradiated by the X-ray irradiator 130 are transmitted through the subject 120 placed on the loading table 110 and formed on a screen of the image intensifier 140 in the form of a visible image. Accordingly, the image of the selected region is obtained by the photographing unit 160 .
- FIG. 4 is a block diagram showing the control mechanism of the X-ray apparatus of the present invention.
- the control mechanism of the X-ray apparatus of the present invention comprises a control unit 190 which controls overall operation of the apparatus, an input unit 170 which receives information from a user and sends the user supplied information to the control unit 190 , an X-ray drive unit 131 which drives the X-ray irradiator 130 to irradiate X-rays to the subject 120 , a table drive unit 111 which drives the loading table 110 which supports the subject 120 , a selection drive unit 151 which drives the image selection unit 150 to select the specific region of the image formed on the image intensifier 140 , the photographing unit 160 which photographs the specific region of the image selected by the image selection unit 150 , and an image processing unit 161 which processes an image taken by the photographing unit 160 and sends the processed image to the control unit 190 .
- control mechanism of the X-ray apparatus further comprises a storage unit 180 which stores image data according to the control of the control unit 190 and a display unit 200 which visually displays a processed image according to the control of the control unit 190 .
- FIG. 5 is a view showing a method of reconstructing a tomogram of the X-ray apparatus of the present invention.
- a user or an examiner obtains a tomogram 210 and a transmission image 220 of the subject 120 through a tomography apparatus.
- the tomogram 210 may be obtained by overlapping a plurality of images of the subject in a conventional manner.
- the user filters the tomogram 210 from the transmission image 220 and obtains model information 240 , that is, a background image.
- model information 240 is obtained, the user obtains a general X-ray transmission image 230 of the subject 120 to be inspected and obtains a desired tomogram 250 by filtering the model information 240 from the general transmission image 230 .
- FIG. 6 is a flow chart showing obtaining the model information of the tomogram reconstructing method of the present invention.
- the control unit 190 controls the table drive unit 111 so that the loading table 110 sets a position of the subject 120 to be photographed.
- the control unit 190 controls the X-ray drive unit 131 so that the X-ray irradiator 130 is operated to irradiate X-rays to the subject 120 . Accordingly, the X-rays transmitted through the subject 120 are formed on the image intensifier 140 .
- the control unit 190 controls the selection drive unit 151 to operate the image selection unit 150 , and controls the photographing unit 160 to photograph the transmission image 230 formed on the image intensifier 140 .
- the image taken by the photographing unit 160 is sent to the control unit 190 through the image processing unit 161 . Accordingly, the control unit 190 obtains the transmission image and stores the transmission image in the storage unit 180 at operation S 10 .
- the control unit 190 obtains a desired tomogram of the subject 120 at operation S 20 .
- the control unit 190 controls the X-ray drive unit 131 so that the X-ray irradiator 130 is operated to irradiate X-rays in different directions.
- the control unit 190 controls the selection drive unit 151 so that the image selection unit 150 is moved in conjunction with the X-ray irradiator 130 to select an image formed on the image intensifier 140 in the direction of the X-rays irradiated from the X-ray irradiator 130 .
- the control unit 190 controls the photographing unit 160 to sequentially photograph the images selected by the image selection unit 150 .
- the photographed images are sent to the control unit 190 through the image processing unit 161 .
- the control unit 190 overlaps the images sent from the image processing unit 161 . Thereafter, the tomogram of the subject 120 is obtained by overlapping, and stored in the storage unit 180 .
- control unit 190 corrects the positions of the images by correcting the errors of the coordinate axes of the transmission image and the tomogram at operation S 20 so as to improve a filtering precision.
- the control unit 190 removes the tomogram from the transmission image by filtering the tomogram from the transmission image at operation S 40 . Accordingly, the tomogram, that is, a target image, is removed from the transmission image, that is, an entire image, so the model information, that is, the background image, remains at operation S 50 .
- the control unit 190 stores the obtained model information in the storage unit 180 .
- the tomogram of the subject is obtained from the transmission image using the obtained model information, as will be described in more detail below.
- the control unit 190 controls the table drive unit 111 so that the position of the loading table 110 is changed and the position of the subject to be photographed is set.
- the control unit 190 controls the X-ray drive unit 131 so that the X-ray irradiator 130 is operated to irradiate X-rays to the subject 120 .
- the control unit 190 controls the selection drive unit 151 so that image selection unit 150 selects and fixes a predetermined position of the image intensifier 140 , that is, the position where the transmission image is formed. Therefore, an error in the position where the transmission image is formed is considerably reduced, so the precision of the tomogram is improved.
- the control unit 190 controls the photographing unit 160 to photograph the transmission image formed on the image intensifier 140 fixed and selected by the image selection unit 150 .
- the image taken by the photographing unit 160 is sent to the control unit 190 through the image processing unit 161 .
- FIG. 7 is a flow chart showing the tomogram reconstructing method of the present invention.
- the control unit 190 obtains the transmission image and stores the obtained transmission image data in the storage unit 180 at operation S 110 .
- the control unit 190 loads the model information previously stored in the storage unit 180 at operation S 120 .
- the transmission image is the entire image of the subject 120
- the model information is the background image except for the desired image of the subject 120 .
- the control unit 190 reconstructs the image using the transmission image and the model information so as to obtain a desired tomogram of the subject 120 at operation S 130 .
- the control unit 190 removes the model information (the background image) from the transmission image in the process of reconstructing the tomogram. Accordingly, the user obtains the desired tomogram of the subject 120 at operation S 140 .
- the display unit 200 visually displays the obtained tomogram according to the control signal of the control unit 190 .
- FIGS. 8A and 8B are views showing examples in which the tomogram reconstructing method of the present invention is applied to actual subjects.
- the subject 120 is a lead.
- a transmission image 310 is obtained through a tomography apparatus, and a tomogram 320 of a desired focal plane is obtained.
- Model information, or a background image is obtained by filtering the tomogram 320 from the obtained transmission image 310 .
- a general transmission image 330 of the subject 120 to be inspected is obtained.
- the tomogram 350 of a desired focal plane is obtained by filtering off the model information 340 from the general transmission image 330 .
- the subject 120 is a ball grid array.
- a transmission image 410 is obtained through a tomography apparatus, and a tomogram 420 of a desired focal plane is obtained.
- Model information, or a background image 440 is obtained by filtering off the tomogram 420 from the obtained transmission image 410 .
- a general transmission image 430 of the subject 120 to be inspected is obtained.
- the tomogram 450 of a desired focal plane is obtained by filtering off the model information 440 from the general transmission image 430 .
- the model information of a subject is previously obtained and a desired tomogram is obtained by filtering off the model information from the transmission image of the subject, thereby improving not only a processing speed but also the precision of image processing for obtaining the tomogram. Additionally, the model information of the subject is previously obtained, so a desirable tomogram is obtained at a high speed even with an X-ray apparatus for photographing only transmission images.
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Abstract
Description
- This application claims the benefit of Korean Application No. 2001-40219 filed Jul. 6, 2001, in the Korean Patent Office, the disclosure of which is incorporated herein by reference.
- 1. Field of the Invention
- The present invention relates generally to X-ray apparatuses, and more particularly to a method of reconstructing a tomogram of an X-ray apparatus to obtain a three-dimensional image from X-ray images.
- 2. Description of the Related Art
- FIG. 1 is a schematic diagram showing a photographing operation of a conventional X-ray apparatus.
- Referring to FIG. 1, while being rotated around a first circular orbit, an
X-ray irradiator 10 irradiates X-rays to asubject 30 at positions A, B, C and D on a first circular orbit. At this time, anX-ray detector 20 is rotated in conjunction with theX-ray irradiator 10 around a second circular orbit having the same central axis as the first circular orbit. Accordingly, theX-ray detector 20 detects X-rays which have been transmitted through thesubject 30 at positions A1, B1, C1 and D1 on the second circular orbit. Images detected by theX-ray detector 20 at the positions A1, B1, C1 and D1 are illustrated in FIG. 2. - Thereafter, the conventional X-ray apparatus constructs a
target image 40 of a cross section, that is, a desiredfocal plane 32, by overlapping a vertical transmission image E and a plurality of slant transmission images obtained by detecting the X-rays which have been transmitted through thesubject 30 at positions A1, B1, C1 and D1. - However, the conventional X-ray apparatus of FIG. 1 is disadvantageous in that a long period of time is required to obtain a tomogram, and the precision of the apparatus deteriorates because images are obtained while an X-ray irradiator and an X-ray detector are moved in conjunction with each other to obtain the tomogram from these images.
- The present invention has been made in view of the above problem, and it is an object of the present invention to provide a method of reconstructing a tomogram of an X-ray apparatus, which improves precision and reduces a required period of time to obtain a desired tomogram from a subject.
- Additional objects and advantages of the invention will be set forth in part in the description which follows, and, in part, will be obvious from the description, or may be learned by practice of the invention.
- To accomplish the above and other objects of the invention, the present invention provides a method of reconstructing a tomogram of an X-ray apparatus, obtaining model information of a subject; obtaining a transmission image of the subject; reconstructing a tomogram based on the transmission image and the model information; and displaying the reconstructed tomogram.
- The above and other objects, features and advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:
- FIG. 1 is a schematic diagram showing the photographing operation of a conventional X-ray apparatus;
- FIG. 2 is a view showing an image processing process;
- FIG. 3 is a schematic diagram showing the structure of an X-ray apparatus in accordance with the present invention;
- FIG. 4 is a block diagram showing the control mechanism of the X-ray apparatus of the present invention;
- FIG. 5 is a view showing a method of reconstructing a tomogram of the X-ray apparatus of the present invention;
- FIG. 6 is a flow chart showing obtaining of model information for use in the tomogram reconstructing method of the present invention;
- FIG. 7 is a flow chart showing the tomogram reconstructing method of the present invention; and
- FIG. 8A is a view showing an example in which the tomogram reconstructing method of the present invention is applied to an actual subject.
- FIG. 8B is view showing another example in which the tomogram reconstructing method of the present invention is applied to another actual subject.
- Reference will now be made in detail to the present embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
- FIG. 3 is a schematic diagram showing the structure of the X-ray apparatus in accordance with the present invention. Referring to FIG. 3, the X-ray apparatus of the present invention comprises a loading table110 which supports a
subject 120, anX-ray irradiator 130 which irradiates X-rays to thesubject 120 placed on the loading table 110, animage intensifier 140 which converts X-rays transmitted through thesubject 120 into a visible image, animage selection unit 150 which selects a specific region from the image converted by theimage intensifier 140, and aphotographing unit 160 which obtains the image of the specific region selected by theimage selection unit 150. - X-rays irradiated by the
X-ray irradiator 130 are transmitted through thesubject 120 placed on the loading table 110 and formed on a screen of theimage intensifier 140 in the form of a visible image. Accordingly, the image of the selected region is obtained by the photographingunit 160. - FIG. 4 is a block diagram showing the control mechanism of the X-ray apparatus of the present invention. Referring to FIG. 4, the control mechanism of the X-ray apparatus of the present invention comprises a
control unit 190 which controls overall operation of the apparatus, aninput unit 170 which receives information from a user and sends the user supplied information to thecontrol unit 190, anX-ray drive unit 131 which drives theX-ray irradiator 130 to irradiate X-rays to thesubject 120, atable drive unit 111 which drives the loading table 110 which supports thesubject 120, aselection drive unit 151 which drives theimage selection unit 150 to select the specific region of the image formed on theimage intensifier 140, the photographingunit 160 which photographs the specific region of the image selected by theimage selection unit 150, and animage processing unit 161 which processes an image taken by the photographingunit 160 and sends the processed image to thecontrol unit 190. - Preferably, the control mechanism of the X-ray apparatus further comprises a
storage unit 180 which stores image data according to the control of thecontrol unit 190 and adisplay unit 200 which visually displays a processed image according to the control of thecontrol unit 190. - FIG. 5 is a view showing a method of reconstructing a tomogram of the X-ray apparatus of the present invention. Referring to FIG. 5, a user (or an examiner) obtains a
tomogram 210 and atransmission image 220 of thesubject 120 through a tomography apparatus. In this case, thetomogram 210 may be obtained by overlapping a plurality of images of the subject in a conventional manner. - After the
tomogram 210 and thetransmission image 220 are obtained, the user filters thetomogram 210 from thetransmission image 220 and obtainsmodel information 240, that is, a background image. After themodel information 240 is obtained, the user obtains a generalX-ray transmission image 230 of thesubject 120 to be inspected and obtains a desiredtomogram 250 by filtering themodel information 240 from thegeneral transmission image 230. - FIG. 6 is a flow chart showing obtaining the model information of the tomogram reconstructing method of the present invention. Referring to FIG. 6, in order to photograph the
subject 120, thecontrol unit 190 controls thetable drive unit 111 so that the loading table 110 sets a position of thesubject 120 to be photographed. After the position of thesubject 120 is set, thecontrol unit 190 controls theX-ray drive unit 131 so that theX-ray irradiator 130 is operated to irradiate X-rays to thesubject 120. Accordingly, the X-rays transmitted through thesubject 120 are formed on theimage intensifier 140. In order to photograph the image formed on theimage intensifier 140, thecontrol unit 190 controls theselection drive unit 151 to operate theimage selection unit 150, and controls the photographingunit 160 to photograph thetransmission image 230 formed on theimage intensifier 140. The image taken by the photographingunit 160 is sent to thecontrol unit 190 through theimage processing unit 161. Accordingly, thecontrol unit 190 obtains the transmission image and stores the transmission image in thestorage unit 180 at operation S10. - After the transmission image of the
subject 120 is obtained, thecontrol unit 190 obtains a desired tomogram of thesubject 120 at operation S20. In more detail, in order to obtain the tomogram of thesubject 120, thecontrol unit 190 controls theX-ray drive unit 131 so that theX-ray irradiator 130 is operated to irradiate X-rays in different directions. Additionally, thecontrol unit 190 controls theselection drive unit 151 so that theimage selection unit 150 is moved in conjunction with theX-ray irradiator 130 to select an image formed on theimage intensifier 140 in the direction of the X-rays irradiated from theX-ray irradiator 130. Thecontrol unit 190 controls the photographingunit 160 to sequentially photograph the images selected by theimage selection unit 150. The photographed images are sent to thecontrol unit 190 through theimage processing unit 161. Thecontrol unit 190 overlaps the images sent from theimage processing unit 161. Thereafter, the tomogram of thesubject 120 is obtained by overlapping, and stored in thestorage unit 180. - After the transmission image and the tomogram of the subject are obtained, the
control unit 190 corrects the positions of the images by correcting the errors of the coordinate axes of the transmission image and the tomogram at operation S20 so as to improve a filtering precision. - Where the correction of the positions of the images is finished, the
control unit 190 removes the tomogram from the transmission image by filtering the tomogram from the transmission image at operation S40. Accordingly, the tomogram, that is, a target image, is removed from the transmission image, that is, an entire image, so the model information, that is, the background image, remains at operation S50. Thecontrol unit 190 stores the obtained model information in thestorage unit 180. - As described above, after the model information of the subject is obtained, the tomogram of the subject is obtained from the transmission image using the obtained model information, as will be described in more detail below.
- In order to photograph the transmission image of the subject120, the
control unit 190 controls thetable drive unit 111 so that the position of the loading table 110 is changed and the position of the subject to be photographed is set. After setting the position of the subject 120, thecontrol unit 190 controls theX-ray drive unit 131 so that theX-ray irradiator 130 is operated to irradiate X-rays to the subject 120. Accordingly, the X-rays transmitted through the subject 120 are formed on theimage intensifier 140. In this case, thecontrol unit 190 controls theselection drive unit 151 so thatimage selection unit 150 selects and fixes a predetermined position of theimage intensifier 140, that is, the position where the transmission image is formed. Therefore, an error in the position where the transmission image is formed is considerably reduced, so the precision of the tomogram is improved. - The
control unit 190 controls the photographingunit 160 to photograph the transmission image formed on theimage intensifier 140 fixed and selected by theimage selection unit 150. The image taken by the photographingunit 160 is sent to thecontrol unit 190 through theimage processing unit 161. - FIG. 7 is a flow chart showing the tomogram reconstructing method of the present invention. Referring to FIG. 7, the
control unit 190 obtains the transmission image and stores the obtained transmission image data in thestorage unit 180 at operation S110. After obtaining the transmission image, thecontrol unit 190 loads the model information previously stored in thestorage unit 180 at operation S120. In this case, the transmission image is the entire image of the subject 120, and the model information is the background image except for the desired image of the subject 120. - The
control unit 190 reconstructs the image using the transmission image and the model information so as to obtain a desired tomogram of the subject 120 at operation S130. Thecontrol unit 190 removes the model information (the background image) from the transmission image in the process of reconstructing the tomogram. Accordingly, the user obtains the desired tomogram of the subject 120 at operation S140. Thedisplay unit 200 visually displays the obtained tomogram according to the control signal of thecontrol unit 190. - FIGS. 8A and 8B are views showing examples in which the tomogram reconstructing method of the present invention is applied to actual subjects. In FIG. 8A, the subject120 is a lead. A
transmission image 310 is obtained through a tomography apparatus, and atomogram 320 of a desired focal plane is obtained. Model information, or a background image is obtained by filtering thetomogram 320 from the obtainedtransmission image 310. After themodel information 340 is obtained, ageneral transmission image 330 of the subject 120 to be inspected is obtained. Finally, thetomogram 350 of a desired focal plane is obtained by filtering off themodel information 340 from thegeneral transmission image 330. - In FIG. 8A, the subject120 is a ball grid array. A
transmission image 410 is obtained through a tomography apparatus, and atomogram 420 of a desired focal plane is obtained. Model information, or abackground image 440 is obtained by filtering off thetomogram 420 from the obtainedtransmission image 410. After themodel information 440 is obtained, ageneral transmission image 430 of the subject 120 to be inspected is obtained. Finally, thetomogram 450 of a desired focal plane is obtained by filtering off themodel information 440 from thegeneral transmission image 430. - As apparent from the above description, in the tomogram reconstructing method of the present invention, the model information of a subject is previously obtained and a desired tomogram is obtained by filtering off the model information from the transmission image of the subject, thereby improving not only a processing speed but also the precision of image processing for obtaining the tomogram. Additionally, the model information of the subject is previously obtained, so a desirable tomogram is obtained at a high speed even with an X-ray apparatus for photographing only transmission images.
- Although a few embodiments of the present invention have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the claims and their equivalents.
Claims (7)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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KR20010040219 | 2001-07-06 | ||
KR2001-40219 | 2001-07-06 | ||
KR01-40219 | 2001-07-06 |
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US6501823B1 US6501823B1 (en) | 2002-12-31 |
US20030007595A1 true US20030007595A1 (en) | 2003-01-09 |
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DE102006023211A1 (en) * | 2006-05-17 | 2007-11-22 | Siemens Ag | X-ray device for medical working place, has x-ray radiator and detector, where two dimensional projections of examining object are detected by movement of radiator and detector and by x-rays to find object`s spatial representation |
CN100588959C (en) * | 2006-10-10 | 2010-02-10 | 同方威视技术股份有限公司 | Small vehicle holding articles automatic detection method based on radiation image-changing testing |
DE102010010723B4 (en) * | 2010-03-09 | 2017-05-04 | Yxlon International Gmbh | Use of a laminography system |
EP3433837A1 (en) | 2016-03-21 | 2019-01-30 | Soreq Nuclear Research Center | Access control system and method thereof |
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JPS5930384B2 (en) * | 1981-12-01 | 1984-07-26 | 東洋製罐株式会社 | Corn potage soup for hot bender |
KR890000906B1 (en) * | 1986-06-28 | 1989-04-13 | 주식회사 한국미생물연구소 | Process for preparing injectable nitroxynil and levamisole preparation against liver flukes and gastrointestinal roundworms |
KR100280747B1 (en) * | 1997-12-20 | 2001-02-01 | 윤종용 | Tomography inspection device |
JPH11206753A (en) * | 1998-01-28 | 1999-08-03 | Hitachi Medical Corp | X-ray radiographic device |
US6298111B1 (en) * | 1998-06-04 | 2001-10-02 | Kabushiki Kaisha Toshiba | X-ray computed tomography apparatus |
JP3768371B2 (en) * | 1998-11-16 | 2006-04-19 | 独立行政法人科学技術振興機構 | CT system |
DE19925395B4 (en) * | 1999-06-02 | 2004-11-25 | Siemens Ag | Method for operating a computed tomography (CT) device |
JP3442346B2 (en) * | 2000-06-01 | 2003-09-02 | カナガワ アンド カンパニー株式会社 | Image forming apparatus and image forming method using the same |
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2002
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- 2002-02-21 DE DE10207331A patent/DE10207331B4/en not_active Expired - Lifetime
- 2002-02-22 CN CNB021052522A patent/CN1238822C/en not_active Expired - Lifetime
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CN1396562A (en) | 2003-02-12 |
KR20030004970A (en) | 2003-01-15 |
CN1238822C (en) | 2006-01-25 |
KR100487148B1 (en) | 2005-05-04 |
DE10207331B4 (en) | 2008-05-29 |
US6501823B1 (en) | 2002-12-31 |
DE10207331A1 (en) | 2003-01-30 |
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