Method of determining physical parameters of bodily structures
First Claim
1. A method, comprising:
- accessing at least two digital images Ii of a bodily structure and a reference object, where each of the digital images shows the bodily structure and at least a portion of the reference object;
the view direction for each image Ii is defined by a unit vector vi; and
there are at least two images Ii1 and Ii2 taken at different instants, such that there is an angle α
between the normal vectors vi1 and vi2 of the respective images, where −
180°
<
α
<
180°
, and α
∉
{−
90°
, 0°
, 90°
}; and
quantifying one or more spatial parameters of the bodily structure using Ii1 and Ii2.
1 Assignment
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Accused Products
Abstract
A method is disclosed to accurately determine spatial parameters (for example, the diameter, cross-sectional area and segment length) of bodily structures like human arteries. This is done by determining the three-dimensional position of these structures from two monoplane X-ray angiographic images obtained at arbitrary but different orientations with respect to the structure of interest. The images may be taken at a different moment, so a monoplane X-ray system can be used. Movement of the structure of interest in between the two X-ray exposures is allowed. The three-dimensional information obtained this way is subsequently used to correct the measurements of above mentioned parameters for commonly encountered error sources.
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Citations
15 Claims
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1. A method, comprising:
-
accessing at least two digital images Ii of a bodily structure and a reference object, where each of the digital images shows the bodily structure and at least a portion of the reference object;
the view direction for each image Ii is defined by a unit vector vi; and
there are at least two images Ii1 and Ii2 taken at different instants, such that there is an angle α
between the normal vectors vi1 and vi2 of the respective images, where −
180°
<
α
<
180°
, and α
∉
{−
90°
, 0°
, 90°
}; and
quantifying one or more spatial parameters of the bodily structure using Ii1 and Ii2. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. A method, comprising:
-
accessing at least two digital images Ii of a bodily structure and a reference object, where each of the digital images shows the bodily structure and at least a portion of the reference object;
the view direction for each image Ii is defined by a unit vector vi; and
there are at least two images Ii1 and Ii2 taken at different instants, such that there is an angle α
between the normal vectors vi1 and vi2 of the respective images, where −
180°
<
α
<
180°
, and α
≠
0°
; and
quantifying one or more spatial parameters of the bodily structure using Ii1 and Ii2;
wherein the bodily structure moves between capture of images Ii1 and Ii2. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method, comprising:
-
acquiring a first image and a second image, each image showing a bodily structure and at least a portion of a calibration object;
selecting a first plurality of n points along a path in the first image;
selecting a second plurality of n points along the path in the second image;
converting each of the first plurality of points into three-dimensional coordinates using information derived from the portion said first image that shows the calibration object. - View Dependent Claims (14, 15)
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Specification