Terrence Chen

US Patent:

8005771, Aug 23, 2011

Filed:

Sep 24, 2008

Appl. No.:

12/236587

Inventors:

Terrence Chen - Princeton NJ, US
Chao Yuan - Secaucus NJ, US
Abdul Saboor Sheikh - Pittsburgh PA, US
Claus Neubauer - Monmouth Junction NJ, US

Assignee:

Siemens Corporation - Iselin NJ

International Classification:

G06F 15/18

US Classification:

706 12

Abstract:

A method and framework are described for detecting changes in a multivariate data stream. A training set is formed by sampling time windows in a data stream containing data reflecting normal conditions. A histogram is created to summarize each window of data, and data within the histograms are clustered to form test distribution representatives to minimize the bulk of training data. Test data is then summarized using histograms representing time windows of data and data within the test histograms are clustered. The test histograms are compared to the training histograms using nearest neighbor techniques on the clustered data. Distances from the test histograms to the test distribution representatives are compared to a threshold to identify anomalies.

US Patent:

8150126, Apr 3, 2012

Filed:

Sep 12, 2008

Appl. No.:

12/283582

Inventors:

Terrence Chen - Princeton NJ, US
Yunqiang Chen - Plainsboro NJ, US

Assignee:

Siemens Aktiengesellschaft - Munich

International Classification:

G06K 9/00

US Classification:

382130, 382128

Abstract:

A method and system for scale-based vessel enhancement in x-ray angiography images is disclosed. An input x-ray image is denoised. A lighting field is estimated in the denoised image. Vessels are extracted from the denoised image by dividing the denoised image by the estimated lighting field. Vessels are enhanced in the input x-ray image by linearly combining the extracted vessels with the input x-ray image, resulting in an enhanced image.

US Patent:

8311308, Nov 13, 2012

Filed:

Dec 6, 2010

Appl. No.:

12/960625

Inventors:

Terrence Chen - Princeton NJ, US
Xiaoguang Lu - West Windsor NJ, US
Thomas Pohl - Marloffstein, DE
Peter Durlak - Erlangen, DE
Dorin Comaniciu - Princeton Junction NJ, US

Assignee:

Siemens Corporation - Iselin NJ

International Classification:

G06K 9/00
A61B 6/02

US Classification:

382131, 382274, 378 42

Abstract:

Stent viewing is provided in medical imaging. Stent images are provided with minimal or no user input of spatial locations. Images showing contrast agent are distinguished from other images in a sequence. After aligning non-contrast images, the images are compounded to enhance the stent. The contrast agent images are used to identify the vessel. A contrast agent image is aligned with the enhanced stent or other image to determine the relative vessel location. An indication of the vessel wall may be displayed in an image also showing the stent. A preview images may be output. A guide wire may be used to detect the center line for vessel identification. Various detections are performed using a machine-trained classifier or classifiers.

US Patent:

8345944, Jan 1, 2013

Filed:

Jul 27, 2009

Appl. No.:

12/509514

Inventors:

Ying Zhu - Monmouth Junction NJ, US
Simone Prummer - Neunkirchen am Brand, DE
Terrence Chen - Princeton NJ, US
Martin Ostermeier - Buckenhof, DE
Dorin Comaniciu - Princeton Junction NJ, US

Assignee:

Siemens Aktiengesellschaft - Munich

International Classification:

G06K 9/00

US Classification:

382130, 382131, 382132, 378 9812

Abstract:

A method and system for extracting coronary vessels fluoroscopic image sequences using coronary digital subtraction angiography (DSA) are disclosed. A set of mask images of a coronary region is received, and a sequence of contrast images for the coronary region is received. For each contrast image, vessel regions are detected in the contrast image using learning-based vessel segment detection and a background region of the contrast image is determined based on the detected vessel regions. Background motion is estimated between one of the mask images and the background region of the contrast image by estimating a motion field between the mask image and the background image and performing covariance-based filtering over the estimated motion field. The mask image is then warped based on the estimated background motion to generate an estimated background layer. The estimated background layer is subtracted from the contrast image to extract a coronary vessel layer for the contrast image.

US Patent:

8374415, Feb 12, 2013

Filed:

Apr 5, 2011

Appl. No.:

13/079846

Inventors:

Sheng Yi - Raleigh NC, US
Terrence Chen - Princeton NJ, US
Peng Wang - Princeton NJ, US
Dorin Comaniciu - Princeton Junction NJ, US

Assignee:

Siemens Corporation - Iselin NJ

International Classification:

G06K 9/00
A61B 6/02

US Classification:

382131, 382274, 378 42

Abstract:

A method and system for detecting and modeling a catheter in a fluoroscopic image is disclosed. Catheter tip candidates and catheter body candidates are detected in the fluoroscopic image. One of a plurality of trained shape models is fitted to the catheter tip candidates and the catheter body candidates in order to model a shape of the catheter in the fluoroscopic image.

US Patent:

8423121, Apr 16, 2013

Filed:

Aug 10, 2009

Appl. No.:

12/538456

Inventors:

Peng Wang - Princeton NJ, US
Ying Zhu - Monmouth Junction NJ, US
Wei Zhang - Plainsboro NJ, US
Terrence Chen - Princeton NJ, US
Peter Durlak - Erlangen, DE
Ulrich Bill - Effeltrich, DE
Dorin Comaniciu - Princeton Junction NJ, US

Assignee:

Siemens Aktiengesellschaft - Munich

International Classification:

A61B 5/05

US Classification:

600424, 600425, 382102

Abstract:

A method and system for tracking a guidewire in a fluoroscopic image sequence is disclosed. In order to track a guidewire in a fluoroscopic image sequence, guidewire segments are detected in each frame of the fluoroscopic image sequence. The guidewire in each frame of the fluoroscopic image sequence is then detected by rigidly tracking the guidewire from a previous frame of the fluoroscopic image sequence based on the detected guidewire segments in the current frame. The guidewire is then non-rigidly deformed in each frame based on the guidewire position in the previous frame.

US Patent:

8548213, Oct 1, 2013

Filed:

Mar 16, 2011

Appl. No.:

13/048930

Inventors:

Michael Wels - Bamberg, DE
Peng Wang - Princeton NJ, US
Terrence Chen - Princeton NJ, US
Simone Prummer - Neunkirchen am Brand, DE
Dorin Comaniciu - Princeton Junction NJ, US

Assignee:

Siemens Corporation - Iselin NJ
Siemens Aktiengesellschaft - Munich

International Classification:

G06K 9/00

US Classification:

382128

Abstract:

A method and system for detecting a guiding catheter in a 2D fluoroscopic image is disclosed. A plurality of guiding catheter centerline segment candidates are detected in the fluoroscopic image. A guiding catheter centerline connecting an input guiding catheter centerline ending point in the fluoroscopic image with an image margin of the fluoroscopic image is detected based on the plurality of guiding catheter centerline segment candidates.

US Patent:

8565859, Oct 22, 2013

Filed:

Jun 29, 2011

Appl. No.:

13/171560

Inventors:

Peng Wang - Princeton NJ, US
Simone Prummer - Neunkirchen am Brand, DE
Terrence Chen - Princeton NJ, US
Dorin Comaniciu - Princeton Junction NJ, US
Olivier Ecabert - Pretzfeld, DE
Martin Ostermeier - Buckenhof, DE

Assignee:

Siemens Aktiengesellschaft - Munich

International Classification:

A61B 5/05
A61B 8/14
G06K 9/00

US Classification:

600427, 600462, 600467, 382128

Abstract:

A method and system for co-registration of angiography data and intra vascular ultrasound (IVUS) data is disclosed. A vessel branch is detected in an angiogram image. A sequence of IVUS images is received from an IVUS transducer while the IVUS transducer is being pulled back through the vessel branch. A fluoroscopic image sequence is received while the IVUS transducer is being pulled back through the vessel branch. The IVUS transducer and a guiding catheter tip are detected in each frame of the fluoroscopic image sequence. The IVUS transducer detected in each frame of the fluoroscopic image sequence is mapped to a respective location in the detected vessel branch of the angiogram image. Each of the IVUS images is registered to a respective location in the detected vessel branch of the angiogram image based on the mapped location of the IVUS transducer detected in a corresponding frame of the fluoroscopic image sequence.