Method and apparatus for imaging the anatomy

• US 5,222,499 A
• Filed: 03/26/1992
• Issued: 06/29/1993
• Est. Priority Date: 11/15/1989
• Status: Expired due to Term

• Current Assignee: Marker
• Original Assignee: George S. Allen, Hsuan Chang, John M. Fitzpatrick, Robert J. Maciunas, Venkateswara R. Mandava
• Inventors: Chang, Hsuan, Fitzpatrick, John M., Mandava, Venkateswara R., Maciunas, Robert J., Allen, George S.
• Primary Examiner(s): Smith, Ruth S.
• Application Number:
  US07/859,256
• Time in Patent Office: 460 Days
• Field of Search: 128/653.1, 128/653.2, 606/130, 382/6, 378/901, 364/413.13, 364/413.16, 364/413.18, 364/413.22
• US Class Current: 600/426
• CPC Class Codes: A61B 2090/363 Use of fiducial points
• CPC Class Codes: A61B 2090/3916 Bone tissue
• CPC Class Codes: A61B 6/12 Arrangements for detecting or locating foreign bodies
• CPC Class Codes: A61B 90/10 for stereotaxic surgery, e.g. frame-based stereotaxis
• CPC Class Codes: A61B 90/39 Markers, e.g. radio-opaque or breast lesions markers

Abstract

The present invention pertains to a fiducial implant for the human body that is detectable by an imaging system. The invention is comprised of a first portion and a second portion. The first portion is configured to be detected by an imaging system when place beneath the skin. The second portion is configured for fixed attachment to a bone beneath the skin without penetrating entirely through the bone and without penetrating entirely through the bone and without fracturing the bone. The first portion is sufficiently large and comprised of a material for detection by an imaging system, and sufficiently small to avoid the distortion of the skin when placed at an interface between the skin and the bone. The first portion also has at least a portion which is spherical and defines a surface for cooperating with a tool for securing the second portion to the bone. Additionally, the placement of n fiducial implants, where n≧4 and an integer, into a portion of anatomy of the human body allows for the recreation of a particular image slice of the portion of the anatomy taken by an imaging system with respect to a first time period, at subsequent imaging sessions and also with different scan modalities. This provides a doctor with the ability to accurately follow the progress of the portion of the anatomy of interest. Moreover, the existence of an fiducial implants allows a target to be identified within the portion of anatomy relative to an external coordinate system. The portion of anatomy with the target may then be operated on, for instance, robotically, or precisely irradiated.

Claims

1. A method for transforming and displaying images of the anatomy comprising:

providing a first set of actual reference markers by implanting at least three fiducial implants in spatial relationship to form a plane on a portion of the anatomy to be imaged;

taking a first set of images of a set of parallel cross-sectional slices of fixed thickness of said portion of the anatomy, said set of slices including points in space corresponding to those occupied by said first set of actual reference markers, said first set of images forming a first set of data;

storing said first set of data corresponding to said images in a storing device;

taking a second set of images of parallel cross-sectional slices of fixed thickness of said portion of the anatomy including points in space corresponding to said first set of actual reference markers, said second set of images forming a second set of data;

storing said second set of data corresponding to said second set of images in a storing device;

transmitting data corresponding to said first set of data and said second set of data to a database library;

displaying at least a first slice of said first set of images;

providing a first set of additional reference markers by assigning a number of computer generated reference points to the first slice;

localizing some of said first set of additional reference markers and said first set of actual reference markers in said first slice;

displaying a second slice of said second set of data;

providing a second set of additional reference markers by assigning a number of computer generated reference points to the second slice;

localizing some of said second set of additional markers and said first set of actual reference markers in said second slice;

labeling three of said first set of additional reference markers and said first set of actual reference markers in said first set of images at least one of which is from said first set of additional reference markers;

labeling three of said second set of additional reference markers and said first set of actual reference markers in said second set of images at least one of which is from said second set of additional reference markers;

calculating spatial transformation data relating said first set of images to said second set of images;

storing said spatial transformation data in said database library;

executing said spatial transformation of said second set of images with respect to said first set of images so that the second set of images is an spatial correspondence with said first set of images;

displaying at least one of said transformed second set of images.

2. The method of claim 1, wherein up to nine computer generated reference points are provided to each slice of said first and second set of images.

3. The method of claim 1, wherein up to nine computer generated reference points are provided with the second slice.

4. The method of claim 1, further comprising:

selecting a first point from either of said data sets;

selecting a second point in the same data set; and

computing the distance between the first and second data points.

5. The method of claim 1, wherein said calculating step includes the step of tracing a continuous line about a portion of a slice so that it may be displayed along with the slice.

6. An apparatus for imaging a portion of the anatomy comprising:

three fiducial implants for use as spatial reference markers, said fiducial implants being adapted for implantation in spatial relationship to form a plane in a portion of the anatomy to be imaged;

means for taking a first series of images at parallel cross-sectional slices of fixed thickness of said portion of the anatomy with some of said slices being taken through said fiducial implants;

means for providing a first set of additional reference markers by assigning at least one computer generated reference point to at least one slice within the first said series of images, said means for providing additional reference markers defining a plane from three of said fiducial implants and said first set of additional reference markers, at least one of which is from said first set of additional reference markers;

means for storing a first set of data corresponding to said images in a storage device with reference to the plane established by said fiducial implants; and

means for displaying at least one of said first series of images corresponding to said data for view by a user from said storage device.

7. The apparatus according to claim 6 further comprising:

means for taking a second series of images at parallel cross-section slices of fixed thickness of said portion of the anatomy with some of said slices being taken through said fiducial implants;

means for providing a second set of additional reference markers by assigning a number of computer generated reference points to at least one slice within the second series of images;

means for storing a second set of data corresponding to said second series of images in said storage device with reference to the plane established by said fiducial implants;

and

wherein said means for displaying is capable of displaying at least one portion of said second set of images corresponding to said data from said storage device and said means for displaying includes means for displaying images corresponding to planes defined by three of said fiducial implants and said first and second set of additional reference markers.

8. The apparatus according to claim 7 wherein said means for displaying includes means for displaying at least one of said first series of images simultaneously with at least one of said second series of images.

9. The apparatus according to claim 8 further comprising means for calculating a transformation angle between said first series of images at parallel cross-sectional slices and said second series of images at parallel cross-sectional slices.

10. The apparatus according to claim 9 wherein said means for calculating the transformation angle includes means for selecting a first image from said first series of images, means for selecting a second image to be transformed from said second series of images, means for labeling three of said first set of additional reference markers and said fiducial implants in the selected second image, means for calculating the transformation of said second image to said first image, means for storing transformation data in data base library, and means for executing the transformation of said second image to said first image.

11. The apparatus according to claim 10 wherein said means for calculating the transformation includes transforming the entire second series of images and means for replacing the data corresponding to said second series of images with data corresponding to said transformation in said data base library.

12. The apparatus according to claim 11 further comprising means for displaying the transformation data on said means for displaying for comparison with data from said first image.

13. The apparatus according to claim 8 further comprising means for inputting test parameters and means for calculating a transformation angle of one displayed image according to said test parameters.

14. The apparatus according to claim 13 wherein said means for inputting test parameters includes means for inputting three eulerian angles associated with the transformation angle.

15. An apparatus for imaging the anatomy comprising:

three fiducial implants for use as reference markers, said fiducial implants being adapted for implantation in spatial relationship to form a plane on a portion of the anatomy to be imaged;

means for taking a first series of images of a set of parallel cross-sectional slices of fixed thickness of said portion of the anatomy that includes said reference markers, said first series of images constituting a first set of data;

means for providing at least one slice from said first series of images at least one computer generated reference point;

means for storing said first set of data corresponding to said images in a storing device;

means for taking a second set of images at parallel cross-sectional slices of fixed thickness of said portion of the anatomy, said second series of images including points in space corresponding to said fiducial markers and constituting a second set of data;

means for providing to at least one slice from said second set of images at least one computer generated reference point;

means for storing said second set of data corresponding to said second series of images in said storing device;

means for transmitting data corresponding to said first set of data and said second set of data to a database library;

means for displaying at least a first slice of said first set of images;

means for localizing some of said fiducial markers and computer generated reference points in said first slice;

means for displaying a second slice of said second set of data;

means for localizing three some of said fiducial markers and computer generated reference points in said second slice;

means for labeling three fiducial markers and computer generated reference points in said first slice;

means for labeling said three localized fiducial markers and computer generated reference points in said second slice;

means for calculating the spatial transformation data relating said first slice to said second slice based on said labeled fiducial markers and computer generated reference points;

means for storing said transformation data in a database library;

means for executing a spatial transformation of said second image with respect to said first image using said transformation data; and

means for displaying said second transformed image.

16. The apparatus of claim 15, further comprising:

means for selecting a first point from either of said data sets;

means for selecting a second point in the same data set; and

means for computing the distance between the first and second data points.

17. The apparatus of claim 16, further comprising means for tracing a continuous line about a portion of a slice so that it may be displayed along with the slice, said means for tracing coupled to said means for displaying.

18. A method for transforming and displaying images of the anatomy comprising:

implanting at least three fiducial implants in spatial relationship to form a plane in a portion of an anatomy to be imaged;

taking a first set of images of a set of parallel cross-sectional slices of fixed thicknesses of said portion of the anatomy, said set of slices including points in space corresponding to points in space occupied by said fiducial implants, said first set of images forming a first set of data;

storing said first set of data corresponding to said first set of images in a storage device;

selecting at a user input device at least one of said first set of parallel cross-sectional slices for display on an image screen;

retrieving data from said storage device of said slices selected at said user input device;

displaying said slices selected at said user input device on said image screen;

selecting at said user input device three of said fiducial implants appearing in said slices displayed on said image screen;

localizing said fiducial implants selected at said user input device in said slices displayed on said image screen;

inputting transform parameters at said user input device; and

executing a spatial transformation of said first set of data in accordance with said transform parameters sufficiently to form a first set of modified data, said first set of modified data comprising cross-sectional slices of image data.

19. The method of claim 18 further comprising:

storing patient identification with said first set of data in said storage device; and

selecting a set of parallel cross-sectional slices of image data based on a desired patient identification.

20. The method of claim 18 further comprising:

displaying some of said cross-sectional slices of image data from said first set of modified data on said display screen.

21. A method for transforming and displaying images of the anatomy comprising:

implanting at least three fiducial implants in spatial relationship to form a plane in a portion of an anatomy to be imaged;

taking a first set of images of a set of parallel cross-sectional slices of fixed thickness of said portion of the anatomy, said first set of slices including points in space corresponding to points in space occupied by said fiducial implants, said first set of images forming a first set of data;

storing said first set of data corresponding to said first set of images in a storage device;

selecting at a user input device at least one of said first set of parallel cross-sectional slices for display on an image screen;

retrieving data from said storage device of said slices from said first set of images selected at said user input device;

displaying said slices from said first set of images selected at said user input device on said image screen;

selecting at said user input device three of said fiducial implants appearing in said slices from said first set of images displayed on said image screen;

localizing said fiducial implants selected at said user input device in said slices from said first set of imaged displayed on said image screen;

taking a second set of images of a set of parallel cross-sectional slices of fixed thickness of said portion of the anatomy, said second set of slices including points in space corresponding to points in space occupied by said fiducial implants, said second set of images forming a second set of data;

storing said second set of data corresponding to said second set of images in said storage device;

selecting at said user input device at least one of said second set of parallel cross-sectional slices for display on said image screen;

retrieving data from said storage device of said slices from said second set of images selected at said user input device;

displaying said slices from said second set of images selected at said user input device on said image screen;

selecting at said user input device three of said fiducial implants appearing in said slices from said second set of data displayed on said image screen;

localizing said fiducial implants selected at said user input device in said slices from said second set of data displayed on said image screen;

calculating spatial transformation data relating said slices from said first set of data to said slices from said second set of data;

storing said spatial transformation data in said storage device; and

executing transformation of said first set of data to said second set of data using said spatial transformation data, such that said second set of data is in spatial correspondence with said first set of data.

22. The method of claim 21, further comprising:

storing patient identification information with said first and second sets of data in said storage device; and

selecting sets of parallel cross-sectional slices of image data based on desired patient identification information.

23. The method of claim 22 further comprising:

displaying some of said cross-sectional slices of image data from said first and second sets of data on said display screen after executing transformation of said first set of data to said second set of data using said spatial transformation data.