David William Roberts
Physician in Lyme, NH
License number
Utah 159403-1205
Issued Date
Jul 1, 1976
Expiration Date
Jan 31, 2004
Category
Physician
Type
Physician & Surgeon
Address
Address
Lyme, NH
Professional information
Method And Apparatus For Depth-Resolved Fluorescence, Chromophore, And Oximetry Imaging For Lesion Identification During Surgery
US Patent:
2011027, Nov 10, 2011
Filed:
Dec 4, 2009
Appl. No.:
13/145505
Inventors:
Frederic Leblond - West Lebanon NH, US
David W. Roberts - Lyme NH, US
Brian W. Pogue - Hanover NH, US
Keith D. Paulsen - Hanover NH, US
Alex Hartov - Enfield NH, US
Scott C. Davis - Woodsville NH, US
Dax Kepshire - West lebanon NH, US
David W. Roberts - Lyme NH, US
Brian W. Pogue - Hanover NH, US
Keith D. Paulsen - Hanover NH, US
Alex Hartov - Enfield NH, US
Scott C. Davis - Woodsville NH, US
Dax Kepshire - West lebanon NH, US
International Classification:
A61B 6/00
US Classification:
600425
Abstract:
A tomographic fluorescent imaging device for imaging fluorophores in biological tissues has a scanned laser for scanning the tissue and a camera for receiving light from the biological tissue at an angle to the beam at a second wavelength ten or more nanometers greater in wavelength than the wavelength of the laser. Use of both intrinsic and extrinsic fluorophores is described. Images are obtained at each of several positions of the beam. An image processing system receives the series of images, models a path of the beam through the tissue, and determines depth of fluorophore in tissue from intersections of the modeled path of the beam and the path of the received light. The laser is of 600 nm or longer wavelength, to provide penetration of tissue. The imaging device is used during surgery to visualize lesions of various types to ensure complete removal of malignant tumors. An alternative embodiment uses differences in intensity of fluorescent radiation from tissue as observed at different wavelengths to determine depth of fluorophore in tissue. An embodiment operates at multiple wavelengths to construct tomographic images of chromophores, such as hemoglobin, and is capable of dynamic imaging.
System And Method For Calibration For Image-Guided Surgery
US Patent:
2011015, Jun 23, 2011
Filed:
May 22, 2009
Appl. No.:
12/994044
Inventors:
Alexander Hartov - Enfield NH, US
Keith D. Paulsen - Hanover NH, US
David William Roberts - Lyme NH, US
Keith D. Paulsen - Hanover NH, US
David William Roberts - Lyme NH, US
International Classification:
G06F 19/00, G10K 15/00
US Classification:
702103
Abstract:
A method of calibrating a transformation of ultrasound data in an imaging system from a first coordinate system into a second coordinate system, the method comprising applying a transformation having parameters. The parameters are calibrated by imaging a planar object, extracting points corresponding to ultrasound rays intersecting the planar object, and fitting the parameters such that the points when transformed by the transformation describe a planar surface in the second coordinate system.
System And Method For Registering Ultrasound And Magnetic Resonance Images
US Patent:
2014005, Feb 27, 2014
Filed:
Nov 15, 2011
Appl. No.:
13/885270
Inventors:
Songbai Ji - Lebanon NH, US
David W. Roberts - Lyme NH, US
Alex Hartov - Enfield NH, US
Keith D. Paulsen - Hanover NH, US
David W. Roberts - Lyme NH, US
Alex Hartov - Enfield NH, US
Keith D. Paulsen - Hanover NH, US
Assignee:
Dartmouth College - Hanover NH
International Classification:
G06T 7/00
US Classification:
382131
Abstract:
A system and methods are presented for emulating the appearance of prominent features captured in ultrasound through directional dilation of a magnetic resonance gradient image along a direction determined by the relative ultrasound scan-head location with respect to the magnetic resonance gradient image in order to improve the robustness and reliability of registration.
System And Method For Providing Patient Registration Without Fiducials
US Patent:
2012021, Aug 23, 2012
Filed:
Aug 27, 2010
Appl. No.:
13/392173
Inventors:
Songbai Ji - Lebanon NH, US
David W. Roberts - Lyme NH, US
Alex Hartov - Enfield NH, US
Keith D. Paulsen - Hanover NH, US
David W. Roberts - Lyme NH, US
Alex Hartov - Enfield NH, US
Keith D. Paulsen - Hanover NH, US
Assignee:
Dartmouth College - Hanover NH
International Classification:
A61B 8/13, A61B 5/055
US Classification:
600411, 600443
Abstract:
A method for providing patient registration without fiducials comprises the steps of: spatially placing an ultrasound image of a patient randomly at different starting positions relative to a preoperative image; creating an independent registration corresponding to each different starting positions, by optimizing a spatial transformation between the preoperative image and the ultrasound image to provide a first batch of registrations; executing a second registration to fine-tune the alignment between the preoperative image and the ultrasound image; and concatenating the spatial transformation to obtain spatial transformation between the patient in an operating room and a corresponding preoperative image.
Apparatus And Method For Modulating Neurochemical Levels In The Brain
US Patent:
8473060, Jun 25, 2013
Filed:
Dec 30, 2009
Appl. No.:
12/649963
Inventors:
James C. Leiter - Woodstock VT, US
Mykyta M. Chernov - Lebanon NH, US
David W. Roberts - Lyme NH, US
Mykyta M. Chernov - Lebanon NH, US
David W. Roberts - Lyme NH, US
Assignee:
The Trustees of Dartmouth College - Hanover NH
International Classification:
A61N 1/18
US Classification:
607 45, 607 48
Abstract:
A treatment for Parkinson's Disease uses a stimulus electrode implanted in a subthalamic nucleus with a chemosensor implanted in a globus pallidus pars interna (GPi) of the subject. A level of a neurochemical is sensed with the chemosensor, and compared to a desired level. When the level of the neurochemical is less than desired, an electrical stimulation is provided to the stimulus electrode. In alternative embodiments, the neurochemical sensed is glutamate or dopamine. An alternative system uses a chemosensor implanted in the striatum instead of the GPi. An alternative system for treating benign essential tremor uses a stimulus electrode implanted in the thalamus with feedback taken from a chemosensor in the striatum.
Apparatus And Method For Modulating Neurochemical Levels In The Brain
US Patent:
8433415, Apr 30, 2013
Filed:
Apr 18, 2012
Appl. No.:
13/449559
Inventors:
James C. Leiter - Woodstock VT, US
Mykyta M. Chemov - Lebanon NH, US
David W. Roberts - Lyme NH, US
Mykyta M. Chemov - Lebanon NH, US
David W. Roberts - Lyme NH, US
Assignee:
The Trustees of Dartmouth College - Hanover NH
International Classification:
A61N 1/36
US Classification:
607 45, 607 48, 600544, 600545
Abstract:
A treatment for Parkinson's Disease uses a stimulus electrode implanted in a subthalamic nucleus with a chemosensor implanted in a globus pallidus pars interna (GPi) of the subject. A level of a neurochemical is sensed with the chemosensor, and compared to a desired level. When the level of the neurochemical is less than desired, an electrical stimulation is provided to the stimulus electrode. In alternative embodiments, the neurochemical sensed is glutamate or dopamine. An alternative system uses a chemosensor implanted in the striatum instead of the GPi. An alternative system for treating benign essential tremor uses a stimulus electrode implanted in the thalamus with feedback taken from a chemosensor in the striatum.
Deep Brain Stimulator
US Patent:
2006017, Aug 3, 2006
Filed:
Oct 5, 2005
Appl. No.:
11/244134
Inventors:
Kendall Lee - West Lebanon NH, US
David Roberts - Lyme NH, US
Alexander Hartov - Lebanon NH, US
David Roberts - Lyme NH, US
Alexander Hartov - Lebanon NH, US
International Classification:
A61N 1/32
US Classification:
607045000
Abstract:
The present invention relates to a method for the detection and ablation of aberrant thalamic oscillations leading to tremor and/or seizure. The invention provides a high frequency stimulator useful for treating and/or preventing the onset of tremor and seizure.