System and method for shape measurements on thick MPR images
First Claim
1. A method for measuring shapes in thick multi-planar reformatted (MPR) digital images, comprising the steps of:
- automatically measuring a shape in a digital MPR image;
scan-converting points corresponding to the identified shape on a starting plane of a thick MPR slab in an image volume from which the MPR was obtained to generate a plurality of starting points for the identified shape, wherein the thick MPR slab comprises a plurality of slices;
calculating an end point in the MPR slab corresponding to each starting point, wherein calculating an end point corresponding to each starting point comprises extending a normal of the MPR slab from each starting point until an end plane of the MPR slab is reached in the image volume, wherein the end point corresponds to a point of intersection of the extended normal and the end plane of the MPR slab;
propagating a ray from each starting point to each corresponding end point;
accumulating samples along each ray; and
computing a desired measurement value from the accumulated samples after reaching the end point for all rays,wherein the steps of automatically measuring a shape, scan-converting points, calculating an end point, propagating a ray, accumulating samples, and computing a desired measurement value are performed by a computer processor.
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Abstract
A method for measuring shapes in thick multi-planar reformatted (MPR) digital images, including identifying a shape in a digital MPR image, scan-converting points corresponding to the identified shape on a starting plane of an MPR slab in an image volume from which the MPR was obtained to generate a plurality of starting points for the identified shape, calculating an end point in the MPR slab corresponding to each starting point, propagating a ray from each starting point to each corresponding end point, accumulating samples along each ray, and computing a desired measurement value from the accumulated samples after reaching the end point for all rays.
17 Citations
20 Claims
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1. A method for measuring shapes in thick multi-planar reformatted (MPR) digital images, comprising the steps of:
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automatically measuring a shape in a digital MPR image; scan-converting points corresponding to the identified shape on a starting plane of a thick MPR slab in an image volume from which the MPR was obtained to generate a plurality of starting points for the identified shape, wherein the thick MPR slab comprises a plurality of slices; calculating an end point in the MPR slab corresponding to each starting point, wherein calculating an end point corresponding to each starting point comprises extending a normal of the MPR slab from each starting point until an end plane of the MPR slab is reached in the image volume, wherein the end point corresponds to a point of intersection of the extended normal and the end plane of the MPR slab; propagating a ray from each starting point to each corresponding end point; accumulating samples along each ray; and computing a desired measurement value from the accumulated samples after reaching the end point for all rays, wherein the steps of automatically measuring a shape, scan-converting points, calculating an end point, propagating a ray, accumulating samples, and computing a desired measurement value are performed by a computer processor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for measuring shapes in thick multi-planar reformatted (MPR) digital images, comprising the steps of:
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automatically measuring a shape in a digital MPR image; scan-converting points corresponding to the identified shape on a starting plane of a thick MPR slab in an image volume from which the MPR was obtained to generate a plurality of starting points for the identified shape, wherein the thick MPR slab comprises a plurality of slices; calculating an end point in the MPR slab corresponding to each starting point, wherein calculating an end point corresponding to each starting point comprises extending a normal of the MPR slab from each starting point fro a distance corresponding to a thickness of the slab, wherein an end point of the extended normal is the end point corresponding to the starting point; propagating a ray from each starting point to each corresponding end point; accumulating samples along each ray; and saving the sample accumulated for each ray, wherein the steps of automatically measuring a shape, scan-converting points, calculating an end point, propagating a ray, accumulating samples, and saving the sample are performed by a computer processor. - View Dependent Claims (11)
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12. A non-transitory program storage device readable by a computer, tangibly embodying a program of instructions executed by the computer to perform the method steps for measuring shapes in thick multi-planar reformatted (MPR) digital images, the method comprising the steps of:
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automatically measuring a shape in a digital MPR image; scan-converting points corresponding to the identified shape on a starting plane of a thick MPR slab in an image volume from which the MPR was obtained to generate a plurality of starting points for the identified shape, wherein the thick MPR slab comprises a plurality of slices; calculating an end point in the MPR slab corresponding to each starting point, wherein calculating an end point corresponding to each starting point comprises extending a normal of the MPR slab from each starting point until an end plane of the MPR slab is reached in the image volume, wherein the end point corresponds to a point of intersection of the extended normal and the end plane of the MPR slab; propagating a ray from each starting point to each corresponding end point; accumulating samples along each ray; and computing a desired measurement value from the accumulated samples after reaching the end point for all rays. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification