Panoramic dental imaging using segmentation and a master arch

1. A method of generating a panoramic x-ray image, the method comprising:

obtaining, with an x-ray detector, volumetric x-ray image data having a first plurality of slices;

defining a vertical threshold based on an anatomical feature of a patient's head;

seperating, with a computer, the x-ray image data into a first portion above the vertical threshold and a second portion below the vertical threshold;

separating, with the computer, the second portion into a second plurality of slices;

generating, with the computer, a plurality of curves for each slice in the second plurality of slices;

generating, with the computer, a master arch for the second plurality of slices; and

generating, with the computer, a panoramic image based on the master arch.

2. The method as claimed in claim 1 , further comprising segmenting the second portion of the x-ray image data to separate image data that represents bone from image data that represents tissue.

3. The method as claimed in claim 2 , further comprising performing a seeding process, including a multi-thread seeding technique involving applying a two-dimensional grid net over an upper portion of each of the second plurality of slices.

4. The method as claimed in claim 1 , wherein generating a master arch for the plurality of slices includes determining a slice from the second plurality of slices that includes a predetermined anatomical feature and determining the longest curve in the slice.

5. The method as claimed in claim 1 , wherein generating a plurality of curves for each slice in the second plurality of slices includes generating an outer curve, an inner curve, and a central curve.

6. The method as claimed in claim 1 , further comprising making a plurality of projections from the master arch.

7. The method as claimed in claim 1 , further comprising; selecting a sagittal slice from the volumetric x-ray image data; and iteratively checking voxel values in the sagittal slice.

8. A panoramic x-ray system comprising:

a gantry;

an x-ray source mounted on the gantry;

an x-ray detector mounted opposite the x-ray source on the gantry; and

a computer that receives volumetric image data from the x-ray detector,

the computer defining a vertical threshold based on an anatomical feature within the image data separating the image data into a first portion above the vertical threshold and a second portion below the vertical threshold; separating the second portion of data into a plurality of slices; generating a plurality of curves for each slice of the plurality of slices; generating a master arch for the plurality of slices; and generating a panoramic image based on the master arch.

9. The system as claimed in claim 8 , wherein the computer segments the second portion of the image data to separate image data that represents bone from image data that represents tissue.

10. The system as claimed in claim 9 , wherein the computer performs a seeding process, including a multi-thread seeding technique involving applying a two-dimensional grid net over an upper portion of each slice.

11. The system as claimed in claim 8 , wherein generating a master arch for the plurality of slices includes determining a slice from the plurality of slices that includes a predetermined anatomical feature and determining the longest curve in the slice.

12. The system as claimed in claim 8 , wherein generating a plurality of curves for each slice includes generating an outer curve, an inner curve, and a central curve.

13. The system as claimed in claim 8 , wherein the computer generates a plurality of projections from the master arch.

14. A method of generating jaw image data, the method comprising:

obtaining, with an x-ray detector, volumetric x-ray image data including a plurality of slices, each slice having a plurality of voxel values;

selecting, with a computer, a vertical sagittal slice from the volumetric image data;

iteratively checking, with the computer, voxel values in the sagittal slice;

seeding, with the computer, each slice in the plurality of slices;

performing, with the computer, region growing;

generating, with the computer, a set of images based on the region growing; and

generating a three-dimensional image based on the set of images.