Daniel Grant Phillips

Address:

6160 Peach Orch Rd, Las Vegas, NV 89142

VIN:

1GNFK13067R184427

Make:

CHEVROLET

Model:

TAHOE

Year:

2007

US Patent:

6720766, Apr 13, 2004

Filed:

Jan 17, 2003

Appl. No.:

10/345988

Inventors:

Kevin J. Parker - Rochester NY 14625
Daniel B. Phillips - Rochester NY 14620

International Classification:

G01V 300

US Classification:

324308, 378207

Abstract:

Phantoms for testing and measuring the performance of magnetic resonance imaging (MRI) and x-ray computed tomography (CT) imaging systems have regions of precisely controlled magnetic resonance and x-ray absorption imaging properties. These regions contain subresolvable regions, or distinct micro regions, with pre-selected magnetic resonance or x-ray absorption properties, called scatterers. The regions are precisely positioned so as to define patterns which form images from which the performance of the imaging system can be evaluated to assure the quality of the images. The phantoms can reveal the combined influences of all the stages in the imaging chain in terms of modulation transfer function and resolution limits as well as other artifacts and defects in the system such as aliasing and degraded spatial frequency response which cannot be evaluated with conventional phantoms. The subresolution scattering regions may be formed by printing them on a thin film sheet or substrate using photo lithography, electrostatic xerographic printing or etching; the toner particles or deposited material forming the scatterers being sub-resolvable in size. Half-tone masks, such as blue noise masks, may be used to produce regions of precisely controlled sub-resolvable scatterers to be used for grey scale evaluation of the imaging system by producing images of different image density.

US Patent:

57568758, May 26, 1998

Filed:

Apr 14, 1995

Appl. No.:

8/423328

Inventors:

Kevin J. Parker - Rochester NY
Daniel B. Phillips - Rochester NY

Assignee:

The University of Rochester - Rochester NY

International Classification:

G01N 2900

US Classification:

73 1DV

Abstract:

Phantoms for testing and measuring the performance of ultrasonic imaging systems have regions of precisely controlled scattering or echogenicity which contain sub-resolvable scatterers. The regions are precisely positioned so as to define patterns which form images from which the performance of the ultrasonic imaging system can be evaluated to assure the quality of the images. The phantoms can reveal the combined influences of all the stages in the imaging chain in terms of modulation transfer function and resolution limits as well as other artifacts and defects in the system such as aliasing and degraded frequency response which cannot be evaluated with conventional ultrasound phantoms. The subresolution scattering regions may be formed by printing them on a thin film sheet or substrate using photo lithography, electrostatic xerographic printing or etching; the toner particles or deposited material forming the scatters being sub-resolvable in size. Half-tone masks, such as blue noise masks, may be used to produce regions of precisely controlled sub-resolvable scatters to be used for grey scale evaluation of the imaging system by producing speckle images of different echogenicity.