Thomas Magee

US Patent:

6816564, Nov 9, 2004

Filed:

Oct 21, 2003

Appl. No.:

10/415809

Inventors:

Thomas J. Beck - Baltimore MD
Howard S. Feldmesser - Columbia MD
Thomas C. Magee - Sykesville MD

Assignee:

The Johns Hopkins University - Baltimore MD

International Classification:

A61B 603

US Classification:

378 5, 378 18, 378901

Abstract:

Techniques for deriving bone properties from images generated by a dual-energy x-ray absorptiometry apparatus include receiving first image data having pixels indicating bone mineral density projected at a first angle of a plurality of projection angles. Second image data and third image data are also received. The second image data indicates bone mineral density projected at a different second angle. The third image data indicates bone mineral density projected at a third angle. The third angle is different from the first angle and the second angle. Principal moments of inertia for a bone in the subject are computed based on the first image data, the second image data and the third image data. The techniques allow high-precision, high-resolution dual-energy x-ray attenuation images to be used for computing principal moments of inertia and strength moduli of individual bones, plus risk of injury and changes in risk of injury to a patient.

US Patent:

7203274, Apr 10, 2007

Filed:

Aug 14, 2003

Appl. No.:

10/399617

Inventors:

Thomas J. Beck - Baltimore MD, US
Howard S. Feldmesser - Columbia MD, US
Thomas C. Magee - Sykesville MD, US

Assignee:

The Johns Hopkins University - Baltimore MD

International Classification:

G01N 23/06

US Classification:

378 54, 378 62

Abstract:

Methods and apparatuses for advanced, multiple-projection, dual-energy X-ray absorptiometry scanning systems include combinations of a conical collimator; a high-resolution two-dimensional detector; a portable, power-capped, variable-exposure-time power supply; an exposure-time control element; calibration monitoring; a three-dimensional anti-scatter-grid; and a gantry-gantry base assembly that permits up to seven projection angles for overlapping beams. Such systems are capable of high precision bone structure measurements that can support three dimensional bone modeling and derivations of bone strength, risk of injury, and efficacy of countermeasures among other properties.