Syngenta Participations Ag

Leland Stanford Junior University

Bin Han

Xun Wang

Tong Zhu

Paul Budworth

Bret Cooper

Devon L Brown

Sherman (Hur-Song) Chang

Lei Xing

A method of electronic portal imaging (EPID) for radiation dosimetric measurement and quality assurance (QA) in radiation therapy is provided that includes imaging a calibration photon beam and a treatment beam using an EPID imager disposed between a plastic water build-up phantom and a plastic water back-scatter phantom that is thicker than the plastic water build-up phantom, correcting the EPID images using an off-axis correction map that takes into account a horn-shape of a photon fluence profile, deconvolving the corrected EPID images using a Monte Carlo simulated EPID response kernel, the deconvolved corrected EPID images provide a primary photon fluence map, reconstructing a relative dose map using the primary photon fluence map convolving with a Monte Carlo simulated pencil-beam dose distribution kernel, and generating an absolute dose map using cross calibration to a 10&#xd7;10 cm2 square field that is compared with a planned dose distribution for QA analysis.

EPID dosimetry method and system for radiation therapy

The instant invention is directed to a constitutive promoter for use in plants. The plant genus from which the promoter is derived is. The invention encompasses the isolated promoter, expression cassettes comprising said promoter and a heterologous nucleic acid segment, and monocot and dicot plants and plant cells transformed with said expression cassettes.

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The invention provides a method to identify a plurality of plant promoters having specified characteristics and promoters identified by the method. The plant genus from which at least some of the promoters are derived is. Also provided are transgenic plants comprising the genes identified by the methods of the invention.

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Palo Alto, CA, United States of America

Bin Han