Dan Thi Nguyen

US Patent:

8136418, Mar 20, 2012

Filed:

Aug 3, 2009

Appl. No.:

12/534168

Inventors:

Bruce W. Behar - Pasadena CA, US
James E. Flatt - Portage MI, US
David J. Gurrola - Fillmore CA, US
Dan T. Nguyen - Irvine CA, US

Assignee:

Parker-Hannifin Corporation - Cleveland OH

International Classification:

F16H 3/06
B64C 17/00

US Classification:

74 8923, 244 992

Abstract:

An electromechanical actuating assembly (), operable in a plurality of fault-tolerant modes to accommodate at least the most probable fault situations. In the M1D1-only mode, actuator-moving power is transferred only through the first drivetrain (A) and decoupling power transmitted through the second decoupling train (B) decouples the second drivetrain (B) from the actuator (). In the M2D2-only mode, actuator-moving power is transferred only through the second drivetrain (B) and decoupling power transmitted through the first decoupling train (A) decouples the first drivetrain (A) from the actuator ().

US Patent:

20190054316, Feb 21, 2019

Filed:

Oct 21, 2016

Appl. No.:

15/770489

Inventors:

- Oakland CA, US
Dan NGUYEN - Los Angeles CA, US
Dan RUAN - Los Angeles CA, US

International Classification:

A61N 5/10

Abstract:

In certain embodiments novel sparse orthogonal collimators (SOCs) for use in radiotherapy are provided. In certain embodiments the SOCs comprise 2 layer 4 bank orthogonal collimators with 2-8 leaves in each of the 4 banks. Instead of using the limited heuristic approach to create jaw-only IMRT, a novel fluence map optimization method is provided based on wavelet decomposition and this method is used for IMRT. An algorithm to simplify the fluence maps with minimal and predictable dose quality compromise is also provided.