Sameer V Tipnis

US Patent:

7352840, Apr 1, 2008

Filed:

Jun 21, 2005

Appl. No.:

11/158918

Inventors:

Vivek V. Nagarkar - Newton MA, US
Sameer V. Tipnis - Waltham MA, US

Assignee:

Radiation Monitoring Devices, Inc. - Watertown MA

International Classification:

A61B 6/03
G01T 1/161

US Classification:

378 19, 378 63, 25036302

Abstract:

The present invention provides internal gain charge coupled devices (CCD) and CT scanners that incorporate an internal gain CCD. A combined positron emission tomography and CT scanner is also provided.

US Patent:

7486766, Feb 3, 2009

Filed:

Feb 25, 2008

Appl. No.:

12/037018

Inventors:

Vivek V Nagarkar - Newton MA, US
Sameer V Tipnis - Waltham MA, US

Assignee:

Radiation Monitoring Devices, Inc. - Watertown MA

International Classification:

A61B 6/03

US Classification:

378 19, 378 43

Abstract:

The present invention provides internal gain charge coupled devices (CCD) and CT scanners that incorporate an internal gain CCD. A combined positron emission tomography and CT scanner is also provided.

US Patent:

8437836, May 7, 2013

Filed:

May 29, 2009

Appl. No.:

12/995685

Inventors:

Daniel Gagnon - Twinsburg OH, US
Sameer Tipnis - Mayfield Village OH, US
Raymond Muzic - Mentor OH, US

Assignee:

Koninklijke Philips Electronics N.V. - Eindhoven

International Classification:

A61B 6/00

US Classification:

600436, 600407, 600410, 382128, 382131, 382132

Abstract:

A diagnostic imaging device includes detector elements () for detecting y-rays indicative of nuclear decay events. Pairs of concurrently detected γ-rays define lines of response (LORs) which are collected, time stamped, and compiled in list-mode. In tissue perfusion studies, it is beneficial to use the data that concurrently maximizes contrast and signal-to-noise ratio in the reconstructed images. Using the list-mode data, events in an adjustable temporal window () are reconstructed and the reconstructed images are analyzed to determine a figure of merit based on contrast and signal-to-noise properties of the image. By iteratively adjusting the temporal window, extending its start point () backwards in time, and repeating the reconstructing, analyzing, and adjusting steps, an image with an optimal figure of merit is obtained.

US Patent:

20040042585, Mar 4, 2004

Filed:

Aug 27, 2002

Appl. No.:

10/228394

Inventors:

Vivek Nagarkar - Newton MA, US
Sameer Tipnis - Waltham MA, US

International Classification:

H05G001/64

US Classification:

378/098800, 250/483100, 250/367000

Abstract:

A method of fabricating an apparatus for an enhanced imaging sensor consisting of pixellated micro columnar scintillation film material for x-ray imaging comprising a scintillation substrate and a micro columnar scintillation film material in contact with the scintillation substrate. The micro columnar scintillation film material is formed from a doped scintillator material. According to the invention, the micro columnar scintillation film material is subdivided into arrays of optically independent pixels having interpixel gaps between the optically independent pixels. These optically independent pixels channel detectable light to a detector element thereby reducing optical crosstalk between the pixels providing for an X-ray converter capable of increasing efficiency without the associated loss of spatial resolution. The interpixel gaps are further filled with a dielectric and or reflective material to substantially reduce optical crosstalk and enhance light collection efficiency.