EP0974936A2
Expired / Lapsed
EP
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Three-dimensional reconstruction of intrabody organs
Assignee: Biosense Webster Inc
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Filing: 1999-07-23
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Granted: —
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Expires: 2019-07-23
Abstract
Abstract A method of reconstructing a map of a volume, including determining coordinates of a plurality of locations on a surface of the volume having a configuration, generating a grid of points defining a reconstruction surface in 3D space in proximity to the determined locations, for each of the points on the grid, defining a respective vector, dependent on a displacement between one or more of the points on the grid and one or more of the locations, and adjusting the reconstruction surface by moving substantially each of the points on the grid responsive to the respective vector, so that the reconstruction surface is deformed to resemble the configuration of the surface.
Inventors
- 👤 Daniel Reisfeld
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 22:25
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/24; A61B5/316; A61B5/318; A61B5/339; A61B5/341; G; G06; G06T; G06T17/00; G06T17/20; A61B2562/00; A61B2562/16; A61B2562/17; A61B5/25; A61B5/279; A61B5/28; A61B5/282; G06T2210/00; G06T2210/41
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
115 words
A method of constructing a map of a body organ having a volume
comprising: determining coordinates of a plurality of locations having a
configuration on a surface of the volume; generating a grid of points defining a reconstruction surface in 3D
space in proximity to the determined locations; for each of the points on the grid, defining a respective vector,
dependent on a displacement between one or more of the points on the grid
and one or more of the locations; and adjusting the reconstruction surface by moving substantially each of
the points on the grid responsive to the respective vector, so that the
reconstruction surface is deformed to resemble the configuration of the
surface.
Claim 2
Dependent Claim
31 words
A method according to claim 1, wherein generating the grid comprises
acquiring an image of the volume and defining the reconstruction surface
such that it resembles the image of the volume.
Claim 3
Dependent Claim
20 words
A method according to claim 1, wherein adjusting the surface
comprises a rough adjustment stage and a flexible matching stage.
Claim 4
Dependent Claim
42 words
A method according to claim 3, wherein the rough adjustment stage
comprises moving each point on the grid toward a respective weighted
center of mass of the determined locations, wherein locations closer to the
point on the grid are given larger weight.
Claim 5
Dependent Claim
52 words
A method according to claim 4, wherein moving each point comprises
defining, for each of the points on the grid, a respective rough adjustment
vector which comprises a weighted sum of vectors from the point to each of
the determined locations and moving the points a distance proportional to
the respective vector.
Claim 6
Dependent Claim
26 words
A method according to claim 3, wherein the flexible matching stage
comprises selecting a grid point to be associated respectively with each of
the determined locations.
Claim 7
Dependent Claim
22 words
A method according to claim 6, wherein the flexible matching stage
comprises moving the selected grid points toward their respective
determined locations.
Claim 8
Dependent Claim
32 words
A method according to claim 7, wherein the flexible matching stage
comprises defining a displacement function which comprises a weighted
sum of vectors, each vector connecting a location and its associated point.
Claim 9
Dependent Claim
27 words
A method according to claim 7, wherein the flexible matching stage
comprises moving the grid points according to the displacement function so
as to smooth the surface.
Claim 10
Dependent Claim
20 words
A method according to claim 1, wherein determining the coordinates
comprises positioning a catheter tip at the plurality of locations.
Claim 11
Dependent Claim
26 words
A method according to claim 10, wherein positioning the catheter tip
comprises positioning the catheter at a plurality of locations in a chamber of
the heart.
Claim 12
Dependent Claim
26 words
A method according to claim 1, and comprising acquiring a signal
indicative of a value of physiological activity at substantially each of the
plurality of locations.
Claim 13
Dependent Claim
26 words
A method according to claim 1, wherein the volume is in motion, and
wherein determining the coordinates comprises determining a correction
factor responsive to the motion.
Claim 14
Dependent Claim
30 words
A method according to claim 13, wherein the motion comprises cyclic
motion, and wherein determining the correction factor comprises determining
a factor responsive to a cycle frequency of the motion.
Claim 15
Dependent Claim
51 words
A method according to claim 1, and comprising estimating a measure
of the volume responsive to the reconstructed surface by choosing a point
inside the grid and calculating the volumes of tetrahedrons defined by the
chosen point and groups of three points on the grid which cover the entire
grid surface.
Claim 16
Dependent Claim
126 words
Apparatus for constructing a map of a body organ having volume from
coordinates of a plurality of determined locations having a configuration on a
surface of the volume, comprising: a processor, which receives the coordinates and generates a grid of
points defining a reconstruction surface in 3D space in proximity to the
determined locations, and which defines a respective vector for each of the points on the grid,
dependent on a displacement between one or more of the points on the grid
and one or more of the locations, and which adjusts the reconstruction surface by moving each of the points
on the grid responsive to the respective vector, so that the reconstruction
surface is deformed to resemble the configuration of the surface of the
volume.
Claim 17
Dependent Claim
43 words
Apparatus according to claim 16, and comprising a probe, which is brought
into engagement with the surface to determine the locations thereon, and wherein
the probe comprises a functional portion for acquiring a value of a physiological
activity at the plurality of locations.
Claim 18
Dependent Claim
43 words
Apparatus according to claim 17, and comprising a probe, which is brought
into engagement with the surface to determine the locations thereon, and further
comprising a reference catheter for registering the determined locations relative to
a frame of reference associated with the volume.
Claim 19
Independent Claim
79 words
A method of displaying values of a parameter which varies over a surface of
a portion of the human body, comprising: determining a value of the parameter at each of a plurality of points on the
surface; and rendering an image of the surface to a display with a different degree of
transparency in different areas of the surface, responsive in each of the areas to
the value of the parameter at one or more points in the area.
Claim 20
Dependent Claim
38 words
A method according to claim 19, wherein determining the value comprises
sampling a plurality of points and creating a map of the surface responsive thereto,
and wherein rendering the image comprises rendering a graphic representation of
the map.
Claim 21
Dependent Claim
40 words
A method according to claim 19, wherein rendering the image comprises
rendering one or more of the areas having a low measure of reliability relative to
another one or more of the areas with a relatively greater degree of transparency.
Claim 22
Dependent Claim
61 words
A method according to claim 20, wherein the plurality of points comprises
sampled points and interpolated points, and further comprising the value
comprises determining a measure of reliability of the map in each of the areas; wherein determining the measure of reliability comprises assigning
measures of reliability to the interpolated points according to their respective
distance from a closest sampled point.
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