Yuan Xu

US Patent:

7573975, Aug 11, 2009

Filed:

Dec 21, 2005

Appl. No.:

11/794557

Inventors:

Yuan Xu - Eugene OR, US
Oleg Tischenko - München, DE
Christoph Hoeschen - Hebertshausen, DE

Assignee:

State of Oregon Acting By and Through the State Board of Higher Education on Behalf of the University of Oregon - Eugene OR
Helmholtz Zentrum Munchen Deutsches Forschungszentrum fur Gesundheit (GmbH) - Neuherberg

International Classification:

A61B 6/00

US Classification:

378 16, 378149

Abstract:

An irradiation method, in particular for imaging a region of investigation () of an object (), comprises generating at least one energy input beam () with at least one energy input beam source (), wherein the at least one energy input beam () comprises a plurality of individual energy input beam components (,. . . ), and irradiating the region of investigation () with the at least one energy input beam () along a plurality of projection directions, wherein the energy input beam components (,. . . ) are formed with at least one beam mask () made of an energy input shielding material with through holes. Furthermore, imaging methods and devices for irradiating or imaging the object are described.

US Patent:

8081807, Dec 20, 2011

Filed:

Dec 21, 2005

Appl. No.:

11/794558

Inventors:

Yuan Xu - Eugene OR, US
Oleg Tischenko - München, DE
Christoph Hoeschen - Hebertshausen, DE

Assignee:

State of Oregon Acting by and through the State Board of Higher Education on Behalf of the University of Oregon - Eugene OR
Helmholtz Zentrum München Deutsches Forschungszentrum für Gesundheit und Umwelt (GmbH) - Neuherberg

International Classification:

G06K 9/00
A61B 6/00

US Classification:

382128, 382280, 378 19

Abstract:

A method of reconstructing an (n+1)-dimensional image function ƒ representing a region of investigation comprises determining the image function ƒ from n-dimensional or less dimensional Radon data comprising a plurality of projection functions p(t) measured corresponding to a plurality of predetermined projection directions (Θ), wherein the image function ƒ is determined as a sum of polynomials multiplied with values of the projection functions p(t). Imaging methods, imaging devices, and computer tomography devices using this reconstruction method are described.

US Patent:

8090089, Jan 3, 2012

Filed:

Oct 25, 2006

Appl. No.:

12/089199

Inventors:

Oleg Tischenko - München, DE
Christoph Hoeschen - Hebertshausen, DE
Yuan Xu - Eugene OR, US

Assignee:

State of Oregon Acting by and through the State Board of Higher Education on Behalf of the University of Oregon - Eugene OR
Helmholtz Zentrum München Deutsches Forschungszentrum für Gesundheit und Umwelt (GmbH) - Neuherberg

International Classification:

G06T 11/00

US Classification:

379149, 378 4, 378 16, 378147, 382131

Abstract:

An imaging method for imaging a region of investigation of an object comprises the steps of generating an energy input beam with an energy beam source, irradiating the region of investigation with energy input beam components of the energy input beam along a plurality of projection directions, the energy input beam components being formed with a frame mask being arranged between the energy input beam and the object and including frame mask windows, measuring first integrated attenuation values of the energy input beam components with an outer detector device arranged outside the frame mask, measuring second integrated attenuation values of the energy input beam components with a frame mask detector device being arranged on an inner surface of the frame mask, and reconstructing an image of the region of investigation based on the first and second integrated attenuation values. Furthermore, an imaging device for imaging a region of investigation of an object is described.

US Patent:

8094910, Jan 10, 2012

Filed:

Mar 14, 2007

Appl. No.:

12/282877

Inventors:

Yuan Xu - Eugene OR, US
Oleg Tischenko - München, DE
Christoph Hoeschen - Hebertshausen, DE

Assignee:

State of Oregon Acting by and through the State Board of Higher Education on Behalf of the University of Oregon - Eugene OR
Helmholtz Zentrum München Deutsches Forschungszentrum für Gesundheit und Umwelt (GmbH) - Neuherberg

International Classification:

G06K 9/00
A61B 6/00

US Classification:

382131, 382280, 378 19

Abstract:

A method of reconstructing an image function on the basis of a plurality of projection profiles corresponding to a plurality of projection directions through a region of investigation, each projection profile including a series of value positions, wherein measured projection values corresponding to projection lines parallel to the respective projection direction are assigned to respective value positions and a plurality of remaining value positions are empty, comprises the steps of (a) assigning first interpolation values to the empty value positions for constructing a plurality of interpolation profiles on the basis of the projection profiles, wherein the first interpolation values are obtained from a first interpolation within a group of measured projection values having the same value position in different projection profiles, and (b) determining the image function by applying a predetermined reconstruction algorithm on the interpolation profiles.

US Patent:

8243875, Aug 14, 2012

Filed:

May 19, 2006

Appl. No.:

11/920941

Inventors:

Yuan Xu - Eugene OR, US
Oleg Tischenko - München, DE
Christoph Hoeschen - Hebertshausen, DE

Assignee:

State of Oregon Acting by and through the State Board of Higher Education - Eugene OR
Helmholtz Zentrum Munchen Deutsches Forschungszentrum fur Gesundheit und Umwelt (GmbH) - Neuherberg

International Classification:

G01K 23/00

US Classification:

378 16, 378 4

Abstract:

An imaging method for imaging a region of investigation of an object, comprises the step of irradiating the region of investigation with at least one energy input beam along a plurality of projection directions, wherein the at least one energy input beam comprises a plurality of individual energy input beam components, wherein the energy input beam is shaped such that at least two of the energy input beam components have different cross-sections and groups of parallel energy input beam components being parallel to one of the projection directions provide a continuous irradiation of the region of investigation. Furthermore, a device for imaging the object is described.

US Patent:

8571171, Oct 29, 2013

Filed:

Dec 4, 2009

Appl. No.:

13/132841

Inventors:

Oleg Tischenko - München, DE
Yuan Xu - Eugene OR, US
Christoph Hoeschen - Hebertshausen, DE

Assignee:

Helmholtz Zentrum Munchen Deutsches Forschungszentrum fur Gesundheit und Umwelt (GmbH) - Neuherberg
State of Oregon Acting by and through the State Board of Higher Education on Behalf of the University of Oregon - Eugene OR

International Classification:

A61B 6/00
G01T 1/161

US Classification:

378 4, 25036304

Abstract:

A method of reconstructing a tomographic image of a region of investigation with reduced artifacts, said method comprises the steps of (a) reconstructing a first partial image and a second partial image of the region of investigation from first and second projection profiles each of which including projection data collected at first and second different groups of parallel projection lines, resp. , wherein the first and second projection profiles are provided such that streak aliasing artifacts in the first and second partial images have different spatial phases, and (b) generating the tomographic image of the region of investigation by superimposing the first and second partial images. Preferably, the first and second projection profiles are constructed such that streak aliasing artifacts in the first and second partial images have opposite spatial phases relative to each other. Furthermore, an imaging method and an imaging device for imaging a region of investigation in an object are described.

US Patent:

8630466, Jan 14, 2014

Filed:

Feb 8, 2008

Appl. No.:

12/527188

Inventors:

Christoph Hoeschen - Hebertshausen, DE
Oleg Tischenko - München, DE
Yuan Xu - Eugene OR, US

Assignee:

State of Oregon Acting by and through the State Board of Higher Education on Behalf of the University of Oregon - Eugene OR
Helmholtz Zentrum Munchen Deutsches Forschungszentrum fur Gesundheit und Umwelt (GmbH) - Neuherberg

International Classification:

G06K 9/00

US Classification:

382128

Abstract:

An image processing method for providing a digitized image as an approximation of an image function ƒ, wherein the digitized image comprises a plurality of pixels with a predetermined pixel size, comprises the steps of providing the image function ƒ from Radon data comprising a plurality of projection functions measured corresponding to a plurality of predetermined projection directions (v), and determining pixel values from the image function, the pixel values representing the digitized image to be obtained, wherein the pixel values are determined in dependence on at least two image function values within the pixel size of the respective pixel. Furthermore, an imaging method and an imaging device using the image processing method are described.