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Guillem E Pratx

from Mountain View, CA
Age ~42
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Also known as:
Pierrejean Pratz Guillem, Boos Guillem
Related to:
Lindsey E Pratx, 41
Connected to:
Brian J Pratz, 45Jordan P Pratz, 41Robert M Pratzel, 75Ryan G Pratzel, 46Loredana A Pratzner, 51Raimonds Praude, 46Donald P Praught, 88Shawn P Praught, 51Crystal S Praul, 45Diana F Praul, 72

Guillem Pratx Phones & Addresses

  • Mountain View, CA
  • Stanford, CA

Work

Company: Stanford university Dec 2012 Position: Assistant professor

Education

Degree: PhD School / High School: Stanford University 2004 to 2009 Specialities: Electrical Engineering

Skills

Molecular Biology • Biomedical Engineering • Latex • Physics • Medical Imaging • Optimization • Image Analysis • Science • Machine Learning • Image Processing • Monte Carlo Simulation • Algorithms • Nuclear Medicine • Radiation Therapy • Opengl • Cuda • Gpgpu • Signal Processing

Industries

Higher Education

Resumes

Resumes

Guillem Pratx Photo 1

Assistant Professor

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Location:
San Francisco, CA
Industry:
Higher Education
Work:
Stanford University since Dec 2012
Assistant Professor
Stanford University School of Medicine since Jan 2010
Postdoctoral Fellow
Education:
Stanford University 2004 - 2009
PhD, Electrical Engineering Ecole Centrale Paris 2002 - 2005
Ingenieur, Engineering
Skills:
Molecular Biology
Biomedical Engineering
Latex
Physics
Medical Imaging
Optimization
Image Analysis
Science
Machine Learning
Image Processing
Monte Carlo Simulation
Algorithms
Nuclear Medicine
Radiation Therapy
Opengl
Cuda
Gpgpu
Signal Processing

Publications

Us Patents

Method Of Reconstructing A Tomographic Image Using A Graphics Processing Unit

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US Patent:
8314796, Nov 20, 2012
Filed:
Feb 23, 2007
Appl. No.:
11/710273
Inventors:
Guillem Pratx - Stanford CA, US
Peter D. Olcott - Menlo Park CA, US
Craig S. Levin - Palo Alto CA, US
Assignee:
The Board of Trustees of the Leland Stanford Junior University - Palo Alto CA
International Classification:
G06T 17/00
G06K 9/00
US Classification:
345424, 345419, 382131, 378 4
Abstract:
The present invention provides a method of reconstructing a tomographic image. In a first step, a tomographic image is forward-projected along a list of geometrical lines in a GPU. This list of geometrical lines may be list-mode event data acquired from a tomographic scanner. Alternatively, the list may be a list of weighted lines derived from a sinogram, a histogram, or a timogram acquired from a tomographic scanner. Next, the list of geometrical lines is back-projected into a 3-dimensional volume using the GPU. The results of the forward- and back-projection are then used to reconstruct the tomographic image, which is then provided as an output, e. g. to make the image available for further processing. Examples of output include storage on a storage medium and display on a display device.

Method And Apparatus For Imaging Using Robust Bayesian Sequence Reconstruction

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US Patent:
8274054, Sep 25, 2012
Filed:
Oct 28, 2009
Appl. No.:
12/607853
Inventors:
Guillem Pratx - Stanford CA, US
Craig S. Levin - Palo Alto CA, US
Assignee:
The Board of Trustees of the Leland Standford Junior University - Stanford CA
International Classification:
G01T 1/00
US Classification:
25036302
Abstract:
Methods and systems for determining a sequence of energy interactions in a detector. A plurality of discrete energy interactions is received in a plurality of detector voxels. A plurality of possible sequences of interaction is formed based on the received plurality of discrete energy interactions. For each of the plurality of possible sequences of interaction, an a posteriori probability is computed, where the a posteriori probability is based on a likelihood that the possible sequence of interaction is consistent with the received plurality of discrete energy interactions. Additionally or alternatively, the a posteriori probability may be based on an a priori probability. One of the formed plurality of possible sequences of interaction is selected based on the computed a posteriori probability.

Shift-Varing Line Projection Using Graphics Hardware

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US Patent:
20110182491, Jul 28, 2011
Filed:
Jan 27, 2011
Appl. No.:
12/931263
Inventors:
Craig S. Levin - Palo Alto CA, US
Guillem Pratx - Mountain View CA, US
Jingyu Cul - Stanford CA, US
Sven P. Prevrhal - San Francisco CA, US
International Classification:
G06K 9/00
US Classification:
382131
Abstract:
Line segments are classified according to orientation to improve list mode reconstruction of tomography data using graphics processing units (GPUs). The new approach addresses challenges which include compute thread divergence and random memory access by exploiting GPU capabilities such as shared memory and atomic operations. The benefits of the GPU implementation are compared with a reference CPU-based code. When applied to positron emission tomography (PET) image reconstruction, the GPU implementation is 43× faster, and images are virtually identical. In particular, the deviation between the GPU and the CPU implementation is less than 0.08% (RMS) after five iterations of the reconstruction algorithm, which is of negligible consequence in typical clinical applications.

Molecular Imaging Using Radioluminescent Nanoparticles

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US Patent:
20110251484, Oct 13, 2011
Filed:
Apr 8, 2011
Appl. No.:
13/066190
Inventors:
Colin M. Carpenter - Redwood City CA, US
Lei Xing - Palo Alto CA, US
Guillem Pratx - Mountain View CA, US
Conroy Ghin Chee Sun - Sunnyvale CA, US
International Classification:
A61B 6/00
US Classification:
600431
Abstract:
Molecular imaging of radioluminescent nanoparticle probes injected into biological tissue is performed by irradiated the tissue with ionizing radiation to induce radioluminescence at optical wavelengths, preferably at predetermined near infrared wavelengths. The optical light is detected and processed to determine a spatial distribution of the probes. The radioluminescent nanoparticles may be inorganic or organic phosphors, scintillators, or quantum dots. Imaging systems realizing this technique include tomographic systems using an x-ray beam to sequentially irradiate selected regions, systems with a radioactive source producing the ionizing radiation from outside the tissue, such as with a beam, or inside the tissue, such as with an endoscope or injected radiopharmaceutical. The optical signals may be detected by a photodetector array external to the tissue, a photodetector integrated with an endoscope or mammographic paddle, integrated into a capsule endoscope, or an array positioned near the biological tissue.

Method For Tracking Moving Sources With Pet

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US Patent:
20150355347, Dec 10, 2015
Filed:
May 13, 2015
Appl. No.:
14/711396
Inventors:
- Palo Alto CA, US
Guillem Pratx - Mountain View CA, US
International Classification:
G01T 5/02
A61B 6/03
A61B 6/00
G01T 1/29
Abstract:
A method of reconstructing time-varying position of individual radioactive point sources directly from Positron Emission Tomography (PET) measurements is provided that includes using a PET scanner to acquire list-mode coincidence events of a moving radioactive point source, using an appropriately programmed computer to model a trajectory of the moving radioactive point source as a 3D function of a temporal variable, then apply an optimization procedure to find the trajectory that minimizes a distance between the trajectory and the recorded list-mode coincidence events, and using the PET scanner to output a real time position of the radioactive point source.

Imaging The Heterogeneous Uptake Of Radiolabeled Molecules In Single Living Cells

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US Patent:
20140242600, Aug 28, 2014
Filed:
Jun 8, 2012
Appl. No.:
13/492606
Inventors:
Lei Xing - Palo Alto CA, US
Colin Carpenter - Redwood City CA, US
Peter Olcott - Stanford CA, US
Guillem Pratx - Mountain View CA, US
Conroy Sun - Sunnyvale CA, US
Assignee:
THE BOARD OF TRUSTEES OF THE LELAND STANFORD JUNIOR UNIVERSITY - Palo Alto CA
International Classification:
G01N 33/50
US Classification:
435 618, 435 14, 4352887
Abstract:
A radioluminescence microscopy system and method for imaging the distribution of radiolabeled molecules in live cell cultures and tissue sections. Cells are grown and incubated with radiolabeled molecules on a scintillator plate or a scintillator plate is placed adjacent to the cells after incubation. Scintillation light produced by decay of radiolabeled molecules inside, bound to, or surrounding the cells, is recorded on an imaging device. Fluorescence microscopy of the same cells with other types of molecules of interest that are labeled with different fluorophores can be conducted concurrently and the biological activity of the labeled molecules can be correlated.
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Guillem E Pratx from Mountain View, CA, age ~42 Get Report