Calibration for 3D reconstruction of medical images from a sequence of 2D images
First Claim
1. A method for calibrating images obtained from an ultrasound imaging device where the imaging device is supported by a positioning mechanism, comprising:
- obtaining at least first and second images from an ultrasound imaging device while said positioning device supports the ultrasound imaging device in first and second positions, respectively, wherein the first and second of images are obtained through rotation of said ultrasound imaging device about an axis of rotation wherein the first and second images are mirror images acquired at angles 180 degrees apart, wherein said positioning mechanism is designed to limit movement of said ultrasound imaging device to said axis of rotation between said first and second positions;
identifying a first distance between said an object in said first image and a known reference point in said first image;
identifying a second distance between said object in said second image and the known reference point in the second image;
determining a difference in said first and second distances; and
calculating a transformation, based on said differences of said first and second images, wherein said transformation defines a calibration of offsets between said reference point of said ultrasound images and said axis of movement of said positioning mechanism.
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Abstract
Provided herein are systems and methods (i.e., utilities) that are directed to correcting misalignments or offsets between a series or sequence of medical images. The utility corrects offsets between a series of medical images obtained where an imaging device (e.g., ultrasound probe) is supported by a positioning mechanism where there is misalignment between an imaging axis or other reference point of the imaging device and the axis of movement of the positioning device. The determination of this offset between these axis allows for calculating a transformation that allows for placing each of the series images into a common frame of reference.
54 Citations
23 Claims
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1. A method for calibrating images obtained from an ultrasound imaging device where the imaging device is supported by a positioning mechanism, comprising:
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obtaining at least first and second images from an ultrasound imaging device while said positioning device supports the ultrasound imaging device in first and second positions, respectively, wherein the first and second of images are obtained through rotation of said ultrasound imaging device about an axis of rotation wherein the first and second images are mirror images acquired at angles 180 degrees apart, wherein said positioning mechanism is designed to limit movement of said ultrasound imaging device to said axis of rotation between said first and second positions; identifying a first distance between said an object in said first image and a known reference point in said first image; identifying a second distance between said object in said second image and the known reference point in the second image; determining a difference in said first and second distances; and calculating a transformation, based on said differences of said first and second images, wherein said transformation defines a calibration of offsets between said reference point of said ultrasound images and said axis of movement of said positioning mechanism. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for calibrating images obtained from an ultrasound imaging device where the imaging device is supported by a positioning mechanism, comprising:
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obtaining at least first and second two dimensional (2D) images from an imaging device while said positioning device supports the ultrasound imaging device in first and second angular positions at angles 180 degrees apart, respectively, wherein said positioning mechanism is designed to limit movement of said ultrasound imaging device to a rotational axis of movement between said first and second angular positions; identifying a first distance between an object in said first image and an imaging axis of said first 2D ultrasound image; identifying a second distance between said object in said second image and the imaging axis of said second 2D ultrasound image; determining a difference in said first and second distances; and calculating a transformation, based on said difference, wherein said transformation defines a calibration of offsets between said imaging axis of said 2D ultrasound images and said rotational axis of said positioning mechanism. - View Dependent Claims (17, 18, 19, 20)
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21. A system for use in obtaining and calibrating images obtained from an ultrasound imaging device supported by a positioning mechanism, comprising:
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an ultrasound imaging probe operative to obtain two-dimensional (2D) ultrasound images; a positioning mechanism adapted to support said ultrasound imaging probe and move said ultrasound imaging probe between first and second mirror positions at angles 180 degrees apart, wherein said positioning mechanism limits movement of said probe to a single degree of freedom relative to a rotational axis; a processor operative to; receive first and second 2D ultrasound images from said ultrasound imaging device at said first and second mirror positions, identify a first distance between an object in said first 2D ultrasound image and an imaging axis of said first 2D ultrasound image; identify a second distance between said object in said second 2D ultrasound image and the imaging axis of said second 2D ultrasound image; and calculate a transformation, based on differences in said first and second distances, wherein said transformation defines a calibration of offsets between said imaging axis of said first and second 2D ultrasound images and said rotational axis of said positioning mechanism. - View Dependent Claims (22, 23)
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Specification