Patent US2843510A successfully refreshed from Google Patents.
Patent US5218623A successfully refreshed from Google Patents.
US5218623A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for specifying slice planes in x-ray computed tomography
Assignee: Toshiba Corp
•
Filing: 1991-11-13
•
Granted: 1993-06-08
•
Expires: 2011-11-13
Abstract
Abstract A method and an apparatus for specifying slice planes in an X-ray CT, capable of specifying a slice plane corresponding to the desired tomographic image easily and accurately. In the apparatus, scans of the body to be examined are carried out and the projection data stored in the large capacity memory first. Then, a scanogram of the body to be examined is displayed, on which a cursor is controlled in order to specify the desired slice planes corresponding to the desired tomographic images to be reconstructed. Then, the desired tomographic images are reconstructed for the desired slice planes indicated by the cursor by using an appropriate part of the projection data stored in the memory which corresponds to the desired slice planes indicated by the cursor. Either one of the helical scan and the multi-scan can be used for collecting the data to obtain the scanogram and the tomographic images.
Inventors
- 👤 Yusuke Toki
- 👤 Makoto Hayashibara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 21:31
CPC Classifications
A; A61; A61B; A61B6/00; A61B6/02; A61B6/03; A61B6/032; A61B6/40; A61B6/4064; A61B6/4085; A61B6/46; A61B6/467; A61B6/469; A61B6/027
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
150 words
An X-ray CT apparatus, comprising: scanner means including an X-ray tube and a detector for carrying out scans of a body to be examined to obtain the projection data of the body to be examined within a prescribed scanning region; memory means for storing the projection data obtained by the scans within the prescribed scanning region carried out by the scanner means; display means for displaying a scanogram of the body to be examined; cursor control means for controlling a cursor on the scanogram displayed by the display means, the cursor indicating desired slice planes corresponding to desired tomographic images; and image reconstruction means for reconstructing the desired tomographic images of the body to be examined for the desired slice planes indicated by the cursor, by using an appropriate part of the projection data stored in the memory means which corresponds to the desired slice planes indicated by the cursor.
Claim 2
Dependent Claim
150 words
An X-ray CT apparatus, comprising: scanner means including an X-ray tube and a detector for carrying out scans of a body to be examined to obtain the projection data of the body to be examined within a prescribed scanning region; memory means for storing the projection data obtained by the scans within the prescribed scanning region carried out by the scanner means; display means for displaying a scanogram of the body to be examined; cursor control means for controlling a cursor on the scanogram displayed by the display means, the cursor indicating desired slice planes corresponding to desired tomographic images; and image reconstruction means for reconstructing the desired tomographic images of the body to be examined for the desired slice planes indicated by the cursor, by using an appropriate part of the projection data stored in the memory means which corresponds to the desired slice planes indicated by the cursor.
Claim 3
Dependent Claim
59 words
The X-ray CT apparatus of claim 1, wherein the display means includes means for displaying the scanogram along with an indication of an image reconstructible region for which the projection data necessary for reconstructing the tomographic images are stored in the memory means, and the cursor control means includes means for controlling the cursor within the image reconstructible region.
Claim 4
Dependent Claim
28 words
The X-ray CT apparatus of claim 1, wherein the image reconstruction means includes means for reconstructing the desired tomographic images according to an externally specified image reconstruction function.
Claim 5
Dependent Claim
19 words
The X-ray CT apparatus of claim 1, wherein the scanner means includes means for carrying out a helical scan.
Claim 6
Dependent Claim
29 words
The X-ray CT apparatus of claim 4, wherein the desired scanning planes are set within a region specified by using the cursor, according to an externally specified slice pitch.
Claim 7
Dependent Claim
18 words
The X-ray CT apparatus of claim 1, wherein the scanner means includes means for carrying out a multi-scan.
Claim 8
Dependent Claim
40 words
The X-ray CT apparatus of claim 6, wherein the display means includes for displaying the scanogram along with an indication of slice positions for which the projection data necessary for reconstructing the tomographic images are stored in the memory means.
Claim 9
Dependent Claim
49 words
The X-ray CT apparatus of claim 1, wherein the display means further includes means for displaying a line segment on each of the desired slice planes, the line segment indicating a desired area to be covered by the desired tomographic image to be reconstructed by the image reconstruction means.
Claim 10
Dependent Claim
36 words
The X-ray CT apparatus of claim 8, wherein the image reconstruction means includes means for reconstructing a zoom tomographic image of the desired area indicated by the line segment for each of the desired slice planes.
Claim 11
Dependent Claim
35 words
The X-ray CT apparatus of claim 8, wherein the display means further includes means for displaying a marking on each line segment indicating a central position of the desired area indicated by the line segment.
Claim 12
Independent Claim
136 words
A method of X-ray CT imaging, comprising the steps of: scanning a body to be examined by using scanner means including an X-ray tube and a detector to obtain the projection data of the body to be examined within a prescribed scanning region; storing in memory means the projection data obtained by the scanner means at the scanning step; displaying a scanogram of the body to be examined on a display means; controlling a cursor on the displayed scanogram, the cursor indicating desired slice planes corresponding to desired tomographic images; and reconstructing the desired tomographic images of the body to be examined for the desired slice planes indicated by the cursor, by using an appropriate part of the projection data stored in the memory means which corresponds to the desired slice planes indicated by the cursor.
Claim 13
Independent Claim
136 words
A method of X-ray CT imaging, comprising the steps of: scanning a body to be examined by using scanner means including an X-ray tube and a detector to obtain the projection data of the body to be examined within a prescribed scanning region; storing in memory means the projection data obtained by the scanner means at the scanning step; displaying a scanogram of the body to be examined on a display means; controlling a cursor on the displayed scanogram, the cursor indicating desired slice planes corresponding to desired tomographic images; and reconstructing the desired tomographic images of the body to be examined for the desired slice planes indicated by the cursor, by using an appropriate part of the projection data stored in the memory means which corresponds to the desired slice planes indicated by the cursor.
Claim 14
Dependent Claim
54 words
The method of claim 11, wherein the displaying step, further includes displaying the scanogram along with an indication of an image reconstructible region for which the projection data necessary for reconstructing the tomographic images are stored in the memory means, and the controlling step further includes controlling the cursor within the image reconstructible region.
Claim 15
Dependent Claim
23 words
The method of claim 11, wherein the reconstructing step includes reconstructing the desired tomographic images according to an externally specified image reconstruction function.
Claim 16
Dependent Claim
15 words
The method of claim 11, wherein the scanning step includes carrying out a helical scan.
Claim 17
Dependent Claim
30 words
The method of claim 14, wherein the controlling step includes setting the desired scanning planes within a region specified by using the cursor, according to an externally specified slice pitch.
Claim 18
Dependent Claim
14 words
The method of claim 11, wherein the scanning step includes carrying out a multi-scan.
Claim 19
Dependent Claim
37 words
The method of claim 16, wherein the displaying step includes displaying the scanogram along with an indication of slice positions for which the projection data necessary for reconstructing the tomographic images are stored in the memory means.
Claim 20
Dependent Claim
39 words
The method of claim 11, wherein the displaying step includes displaying a line segment on each of the desired slice planes, the line segment indicating a desired area to be covered by the desired tomographic image to be reconstructed.
Claim 21
Dependent Claim
32 words
The method of claim 18, wherein the image reconstructing step includes reconstructing a zoom tomographic image of the desired area indicated by the line segment for each of the desired slice planes.
Claim 22
Dependent Claim
30 words
The method of claim 18, wherein the displaying step includes displaying a marking on each line segment indicating a central position of the desired area indicated by the line segment.
References Cited (Backward Citations)
US4086492A
Cited
US4259725A
Cited
US4649555A
Cited
US4674046A
Cited
US4789929A
Cited
US5018178A
Cited
US5103469A
Cited
US5060246A
Cited
JPH02196383A
Cited
US5023895A
Cited
US4977588A
Cited
US5084908A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-06-07 | 1996-12-07 | 1997-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-06-07 | 2000-12-07 | 2001-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-06-07 | 2004-12-07 | 2005-06-08 | $7700.00 | Window Closed / Lapsed |