Michael J Silver

US Patent:

6466638, Oct 15, 2002

Filed:

Feb 11, 2000

Appl. No.:

09/502451

Inventors:

Michael D. Silver - Northbrook IL
Anindya Sen - Vernon Hills IL

Assignee:

Kabushiki Kaisha Toshiba - Kawasaki

International Classification:

A61B 603

US Classification:

378 4, 378901

Abstract:

A method and system for reconstructing an x-ray image through mapping. The system rotates an x-ray source and an x-ray detector in an irregular path. A calibration factor matrix for each position of a source and detector is calculated using a calibration phantom and then stored for use during reconstruction. The image is reconstructed by mapping a reprojected image point from a known coordinate using the calibration factors. The mapping takes into consideration the non-idealities in the irregular path, improving the image reconstruction.

US Patent:

6542570, Apr 1, 2003

Filed:

Apr 14, 2000

Appl. No.:

09/549562

Inventors:

Michael D. Silver - Northbrook IL

Assignee:

Kabushiki Kaisha Toshiba - Kawasaki

International Classification:

A61B 603

US Classification:

378 4, 378901

Abstract:

A method and system for reconstructing an x-ray image from a partial orbit through the use of a âvirtualâ fan angle. The virtual fan angle is determined based upon the range of angular positions spanned by a source in a CT instrument or a selected smaller angle. Exposure data is obtained and he virtual fan angle is used to weight the exposure data. Image reconstruction can then proceed using the weighted exposure data. The described methods and system also function for data collected over a complete orbit.

US Patent:

6778630, Aug 17, 2004

Filed:

Mar 25, 2002

Appl. No.:

10/103781

Inventors:

Michael D. Silver - Northbrook IL
Katsuyuki Taguchi - Tochigi-ken, JP

Assignee:

Kabushiki Kaisha Toshiba - Tokyo

International Classification:

A61B 603

US Classification:

378 15, 378 4, 378901

Abstract:

A method and system for reconstructing an x-ray image from a partial orbit through the use of a âvirtualâ fan angle. The virtual fan angle is determined based upon the range of angular positions spanned by a source in a CT instrument or a selected smaller angle. Exposure data is obtained and he virtual fan angle is used to weight the exposure data. Image reconstruction can then proceed using the weighted exposure data. The described methods and system also function for data collected over a complete orbit.

US Patent:

7359478, Apr 15, 2008

Filed:

Nov 18, 2004

Appl. No.:

10/990464

Inventors:

Aleksandr A. Zamyatin - Buffalo Grove IL, US
Katsuyuki Taguchi - Buffalo Grove IL, US
Michael D. Silver - Northbrook IL, US

Assignee:

Toshiba Medical Systems Corporation - Otawara-shi
Kabushiki Kaisha Toshiba - Tokyo

International Classification:

A61B 6/03

US Classification:

378 15, 378 4, 378 19, 378901

Abstract:

A method, system, and computer program product for compensating for the unavailability of projection data of a scanned object at a selected point, the selected point located outside a detection range of a detector. The method include the steps of obtaining projection data of the scanned object, and compensating for the unavailability of the projection data at the selected point based on the obtained projection data and coordinates of the selected point relative to the detector. The compensating step includes determining at least one complementary projection angle and coordinates of at least one complementary point based on a source projection angle and the coordinates of the selected point relative to the detector, and estimating the projection data value at the selected point based on the acquired projection data, the at least one complementary projection angle, and the coordinates of the at least one complementary point.

US Patent:

7623691, Nov 24, 2009

Filed:

Aug 6, 2004

Appl. No.:

10/912183

Inventors:

Ilmar A. Hein - Schaumburg IL, US
Katsuyuki Taguchi - Buffalo Grove IL, US
Michael D. Silver - Northbrook IL, US

Assignee:

Kabushiki Kaisha Toshiba - Tokyo
Toshiba Medical Systems Corporation - Otawara-shi

International Classification:

G06K 9/00

US Classification:

382128, 382131, 378 4, 378 21, 600407

Abstract:

A method of removing an imaging artifact in a medical image, including obtaining a first plurality of images, the first plurality of images collectively defining a first image volume; filtering the first plurality of images to create a second plurality of images, each image in the second plurality of images comprising an average of at least two images in the first plurality of images; selecting a first image from the first plurality of images; adding a lost noise image to a second image in the second plurality of images to create a noise restored image, the second image in the second plurality of images corresponding to the first image in the first plurality of images; determining a gradient image based on pixel values in the second plurality of images, the gradient image comprising a gradient value at each pixel location in the second image; and combining, based on the determined gradient image, the first image and the noise restored image to obtain a corrected image that does not contain the imaging artifact.

US Patent:

7660383, Feb 9, 2010

Filed:

Aug 23, 2007

Appl. No.:

11/844048

Inventors:

Takuya Sakaguchi - Shioya-gun, JP
Michael D. Silver - Northbrook IL, US
Jingwu Yao - Wheeling IL, US
Mei Chen - Elk Grove Village IL, US
Stefan Bozhilov - LomBard IL, US
Satoru Ohishi - Otawara, JP

Assignee:

Kabushiki Kaisha Toshiba - Tokyo
Toshiba Medical Systems Corporation - Otawara-shi

International Classification:

A61B 6/00

US Classification:

378 8

Abstract:

A three dimensional image processing apparatus includes a storage unit storing data of images in different radiographing directions together with information concerning cardiac phases, a key image selection unit selecting key images from the images, a feature point designation unit designatting feature points on the selected key images in accordance with operation by an operator, and an image reconstruction unit reconstructing a three dimensional image from the images on the basis of positions of the designated feature points, wherein the key image selection unit selects, as the key images, a pair of images which are located at the same cardiac phase and whose radiographing directions are different by a substantially predetermined angle and images spaced apart from each other by an angle obtained by substantially equally dividing an interval between the pair of images by a predetermined number.

US Patent:

7912180, Mar 22, 2011

Filed:

Feb 19, 2009

Appl. No.:

12/388947

Inventors:

Yu Zou - Naperville IL, US
Michael D. Silver - Northbrook IL, US
Satoru Ohishi - Otawara, JP
Kozo Sato - Otawara, JP

Assignee:

Kabushiki Kaisha Toshiba - Tokyo
Toshiba Medical Systems Corporation - Otawara-shi

International Classification:

G01N 23/201
G01N 23/00

US Classification:

378 87, 378 7

Abstract:

Scattered radiation is estimated by using a reduced image generated from a projection image, and the scattered radiation image of the projection image is acquired by enlargement processing. The scattered radiation correction of the projection image is executed by subtracting the obtained scattered radiation image from the projection image. In addition, when a primary X-ray image and a scattered radiation image in each projection direction are to be obtained by sequential approximation calculation, a primary X-ray image which has already been identified in an adjacent projection direction is used as a first estimated value (initially set value) in next sequential calculation.

US Patent:

8005284, Aug 23, 2011

Filed:

Dec 7, 2006

Appl. No.:

11/608005

Inventors:

Takuya Sakaguchi - Shioya-gun, JP
Michael D. Silver - Northbrook IL, US

Assignee:

Kabushiki Kaisha Toshiba - Tokyo
Toshiba Medical Systems Corporation - Otawara-shi

International Classification:

G06T 15/00

US Classification:

382131, 382154

Abstract:

A three dimensional image processing apparatus includes a feature point designation unit which designates feature points on at least two selected images selected from a plurality of images in different radiographing directions, a three dimensional position calculation unit which calculates a three dimensional position associated with a feature point, a two dimensional position calculation unit which calculates the two dimensional position of a feature point on an unselected image on the basis of the calculated three dimensional position of the feature point, a feature point extraction unit which extracts a feature point from an unselected image, a positional shift calculation unit which calculates a positional shift of the two dimensional position of the extracted feature point with respect to the calculated two dimensional position of the feature point, and a correction unit which corrects the position of the unselected image on the basis of the calculated positional shift.