The Johns Hopkins University

The Brigham and Women's Hospital, Inc.

Ehsan Azimi

Peter Kazanzides

Nassir Navab

Long Qian

Bin Liu

Mark Brezinski

Camilo Molina

Judy Huang

A computer-implemented method includes: receiving, by an augmented reality device, a medical image of a surgical site, generating, by the augmented reality device, a virtual surgical site model based on the medical image; presenting, by the augmented reality device, the virtual surgical site model; receiving, by the augmented reality device, user calibration input; aligning, by the augmented reality device, the virtual surgical site model with a real-life surgical site based on the user calibration input; and displaying, by the augmented reality device and after the aligning, a virtual insertion path between an incision point and a target point to aid in inserting a tool as part of performing a surgical procedure.

Augmented reality based surgical navigation system

A calibration platform may obtain measurements for aligning a real-world coordinate system and a display coordinate system. For example, the calibration platform may display, via an optical see-through head-mounted display (OST-HMD), a three-dimensional virtual object and receive, from a positional tracking device, information that relates to a current pose of a three-dimensional real-world object to be aligned with the three-dimensional virtual object. The calibration platform may record a three-dimensional position of a plurality of points on the three-dimensional real-world object based on the current pose of the three-dimensional real-world object, based on an indication that the plurality of points on the three-dimensional real-world object respectively corresponds with a plurality of points on the three-dimensional virtual object. Accordingly, based on the obtained measurements, the calibration platform may generate a transformation function to provide a mapping between three-dimensional points in the real-world coordinate system and three-dimensional points in the display coordinate system.

Calibration system and method to align a 3D virtual scene and a 3D real world for a stereoscopic head-mounted display

A calibration platform may display, via an optical see-through head-mounted display (OST-HMD), a virtual image having at least one feature. The calibration platform may determine, based on information relating to a gaze of a user wearing the OST-HMD, that the user performed a voluntary eye blink to indicate that the at least one feature of the virtual image appears to the user to be aligned with at least one point on the three-dimensional real-world object. The calibration platform may record an alignment measurement based on a position of the at least one point on the three-dimensional real-world object in a real-world coordinate system based on a time when the user performed the voluntary eye blink. Accordingly, the alignment measurement may be used to generate a function providing a mapping between three-dimensional points in the real-world coordinate system and corresponding points in a display space of the OST-HMD.

Blink-based calibration of an optical see-through head-mounted display

Systems and methods for enhancing spectral domain optical coherence tomography (OCT] are provided. In particular, a system and method for calibration of spectral interference signals using an acquired calibration signal are provided. The calibration signal may be logarithmically amplified to further improve the accuracy of the calibration. From the calibration signal, a series of more accurate calibration data are calculated. An acquired spectral interference signal is calibrated using these calibration data. Moreover, systems that include logarithmic amplification of the spectral interference signal and variable band-pass filtering of the spectral interference signal are provided. Such systems increase the dynamic range and visualization capabilities relative to conventional spectral domain OCT systems.

Growing community of inventors

Baltimore, MD, United States of America

Ehsan Azimi