Whole-leg X-ray image processing and display techniques

• US 5,123,056 A
• Filed: 02/02/1990
• Issued: 06/16/1992
• Est. Priority Date: 02/02/1990
• Status: Expired due to Term

• Current Assignee: Siemens Medical Systems, Inc. (Siemens AG)
• Original Assignee: Siemens Medical Systems, Inc. (Siemens AG)
• Inventors: Wilson, David L.
• Primary Examiner(s): Razavi, Michael
• Application Number:
  US07/474,420
• Time in Patent Office: 865 Days
• Field of Search: 382/6, 382/19, 382/1, 382/54, 382/8, 364/413.13, 364/413.17, 364/413.15, 364/413.23, 364/413.22, 358/111, 358/167, 358/166, 358/169
• US Class Current: 382/132
• CPC Class Codes: A61B 6/4476 related to motor-assisted motion of the source unit
• CPC Class Codes: A61B 6/469 for selecting a region of interest [ROI]
• CPC Class Codes: A61B 6/5241 combining overlapping images of the same imaging modality, e.g. by stitching
• CPC Class Codes: H04N 5/3205 using subtraction imaging techniques
• CPC Class Codes: H05G 1/26 Measuring, controlling or protecting measuring X-ray radiation G01T
• CPC Class Codes: H05G 1/60 Circuit arrangements for obtaining a series of X-ray photographs or for X-ray cinematography

Abstract

An X-ray examination device having an imaging area which is less than the length of an object to be imaged, acquires a series of high-resolution input images at selected different positions which overlap along the length of the object. The high-resolution images are processed in accordance with first and second methods for later application to a display device. The first method creates a low-resolution composite image for display which is simutaneously representative of a plurality of the high-resolution acquired images, and the second method determines portions of each of the acquired images which are to be deleted and provides to the display the series of high-resolution images in a scroll fashion with the predetermined portions deleted from the adjacent images. The user has control means for controllably indicating a position (region of interest) on the display for causing the display to provide a high-resolution image which is centered about the region of interest. Additionally, the control means provides control signals to a gantry control apparatus for centering the X-ray examination device over the region of interest. Finally, a processing method and apparatus is provided for displaying the scrolled images in a visually pleasing manner wherein the portions of adjacent images to be deleted is determined by providing continuity for identifiable features of the high-resolution images.

Claims

1. A method for operating an X-ray examination device having an imaging area with a length which is less than the length of an object to be imaged, comprising:

acquiring a series of high-resolution input images at selected different positions which overlap along the length of said object;

processing said series of high-resolution images in accordance with both a first and a second method, said first method determining a low-resolution composite image for providing to said display a composite image which is simultaneously representative of a plurality of said high-resolution acquired images, and said second method determining a portion of each of said high-resolution images which is to be deleted so as to minimize double display of said overlapped length of said object for providing to said display said series of high-resolution images in a sequential fashion; and

using the display of the acquired images processed by either one of said first or second methods for controllably indicating a position (region of interest) on said display so as to cause said display to provide a high-resolution image which is centered about said region of interest.

5. The method of claim 1, wherein said second method of said processing step which determines a portion of each of said high-resolution images which is to be deleted, comprises, for adjacent ones of said series of high-resolution images;

searching for correspondingly positioned rows in each of said adjacent images which have at least a predetermined minimum degree of similarity for identifiable features contained therein, said searching beginning near an outer edge of said images and proceeding into said image in a row-by-row manner;

when a pair of correspondingly positioned rows are found having said predetermined minimum degree of similarity, deleting those rows of each of said images which are between said pair of rows and said outer edge of each of said images; and

joining a portion of each of said images which remains after said deletion together at said correspondingly positioned rows for subsequent display of said adjacent images as a single displayed image.

2. A method for operating an X-ray examination device having an imaging area with a length which is less than the length of an object to be imaged, comprising:

acquiring a series of high-resolution input images at selected different positions which overlap along the length of said object;

processing said series of high-resolution images in accordance with both a first and a second method, said first method determining a low-resolution composite image for providing to said display a composite image which is simultaneously representative of a plurality of said high-resolution acquired images, sand said second method determining a portion of each of said high-resolution images which is to be deleted so as to minimize double display of said overlapped length of said object for providing to said display said series of high-resolution images in a sequential fashion; and

using the display of the acquired images processed by either one of said first or second methods for controllably indicating a position (region of interest) on said display so as to cause control signals to be applied to a gantry control apparatus for centering said X-ray examination device over said region of interest.

6. The method of claim 2, wherein said second method of said processing step which determines a portion of each of said high-resolution images which is to be deleted, comprises, for adjacent ones of said series of high-resolution images:

searching for correspondingly positioned rows in each of said adjacent images which have at least a predetermined minimum degree of similarity for identifiable features contained therein, said searching beginning near an outer edge of said images and proceeding into said image in a row-by-row manner;

when a pair of correspondingly positioned rows are found having said predetermined minimum degree of similarity, deleting those rows of each of said images which are between said pair of rows and said outer edge of each of said images; and

joining a portion of each of said images which remains after said deletion together at said correspondingly positioned rows for subsequent display of said adjacent images as a single displayed image.

3. Apparatus for operating an X-ray examination device having an imaging area with a length which is less than the length of an object to be imaged, comprising:

means for acquiring a series of high-resolution input images at selected different positions which overlap along the length of said object;

processing said series of high-resolution images in accordance with both a first and a second method, said first method determining a low-resolution composite image for providing to said display a composite image which is simultaneously representative of a plurality of said high-resolution acquired images, and said second method determining a portion of each of said high-resolution images which is to be deleted so as to minimize double display of said overlapped length of said object for providing to said display said series of high-resolution images in a sequential fashion; and

means for using the display of the acquired images processed by either one of said first or second methods for controllably indicating a position (region of interest) on said display so as to cause said display to provide a high-resolution image which is centered about said region of interest.

7. The apparatus of claim 3, wherein said means for processing in accordance with said second method which determines a portion of each of said high-resolution images which is to be deleted, comprises:

means for searching for correspondingly positioned rows in each of adjacent ones of said plurality of images which have at least a predetermined minimum degree of similarity for identifiable features contained therein, and for indicating when a pair of correspondingly positioned rows are found having said predetermined minimum degree of similarity;

means for deleting those rows of each of said images which are between said pair of rows indicated to possess at least said minimum degree of similarity and an outer edge of each of said images; and

means for joining that portion of each of said images which remains after said deletion together at said correspondingly positioned rows for subsequent display of said adjacent images as a single displayed image.

4. Apparatus for operating an X-ray examination device having an imaging area with a length which is less than the length of an object to be imaged, comprising:

means for acquiring a series of high-resolution input images at selected different positions which overlap along the length of said object;

processing said series of high-resolution images in accordance with both a first and a second method, said first method determining a low-resolution composite image for providing to said display a composite image which is simultaneously representative of a plurality of said high-resolution acquired images, and said second method determining a portion of each of said high-resolution images which is to be deleted so as to minimize double display of said overlapped length of said object for providing to said display said series of high-resolution images in a sequential fashion; and

means for using the display of the acquired images processed by either one of said first or second methods for controllably indicating a position (region of interest) on said display so as to cause control signals to be applied to a gantry control apparatus for centering said X-ray examination device over said region of interest.

8. The apparatus of claim 4, wherein said means for processing in accordance with said second method which determines a portion of each of said high-resolution images which is to be deleted, comprises:

means for searching for correspondingly positioned rows in each of adjacent ones of said plurality of images which have at least a predetermined minimum degree of similarity for identifiable features contained therein, and for indicating when a pair of correspondingly positioned rows are found having said predetermined minimum degree of similarity;

means for deleting those rows of each of said images which are between said pair of rows indicated to possess at least said minimum degree of similarity and an edge of each of said images; and

means for joining that portion of each of said images which remains after said deletion together at said correspondingly positioned rows for subsequent display of said adjacent images as a single displayed image.

9. A method for joining together a series of electronically stored images, comprising:

acquiring a plurality of images at selected different positions which overlap each other along a given dimension of an object;

storing each of said acquired images in an electronic memory as a multiple-row array of image pixels;

searching for correspondingly positioned rows in a portion of each of said stored image arrays which have a position overlap therebetween, said searching being for correspondingly positioned rows which have at least a predetermined minimum degree of similarity for identifiable features contained therein and indicating when a pair of correspondingly positioned rows are found having at least said minimum degree of similarity;

deleting those rows of pixels in each of said stored image arrays which are between said indicated pair of rows having at least said minimum degree of similarity and an outer edge of said image array; and

joining a portion of each of said image array which remains after said deletion together, said joining being at said correspondingly positioned rows having said at least minimum degree of similarity.

10. An apparatus for joining together a series of electronically stored images, comprising:

means for acquiring a plurality of images at selected different positions which overlap each other along a given dimension of an object;

means for storing each of said acquired images in an electronic memory as a multiple-row array of image pixels;

means for searching for correspondingly positioned rows in a portion of each of said stored image arrays which have a position overlap therebetween, said searching being for correspondingly positioned rows which have at least a predetermined minimum degree of similarity for identifiable features contained therein and indicating when a pair of correspondingly positioned rows are found having at least said minimum degree of similarity;

means for deleting those rows of pixels in each of said stored image arrays which are between said indicated pair of rows having at least said minimum degree of similarity and an outer edge of said image array; and

means for joining a portion of each of said image array which remains after said deletion together, said joining being at said correspondingly positioned rows having said at least minimum degree of similarity.