X-ray or gamma ray systems or devices – Specific application – Absorption
Reexamination Certificate
2007-07-31
2009-08-04
Ho, Allen C. (Department: 2882)
X-ray or gamma ray systems or devices
Specific application
Absorption
C378S008000, C378S020000, C378S041000, C378S042000, C378S095000, C600S428000
Reexamination Certificate
active
07570738
ABSTRACT:
A method for four-dimensional (4D) image verification in respiratory gated radiation therapy, includes: acquiring 4D computed tomography (CT) images, each of the 4D CT images representing a breathing phase of a patient and tagged with a corresponding time point of a first surrogate signal; acquiring fluoroscopic images of the patient under free breathing, each of the fluoroscopic images tagged with a corresponding time point of a second surrogate signal; generating digitally reconstructed radiographs (DRRs) for each breathing phase represented by the 4D CT images; generating a similarity matrix to assess a degree of resemblance in a region of interest between the DRRs and the fluoroscopic images; computing a compounded similarity matrix by averaging values of the similarity matrix across different time points of the breathing phase during a breathing period of the patient; determining an optimal time point synchronization between the DRRs and the fluoroscopic images by using the compounded similarity matrix; and acquiring a third surrogate signal and turning a treatment beam on or off according to the optimal time point synchronization.
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Celi Juan Carlos
Florin Charles Henri
Khamene Ali
Ofstad Barbara
Rousson Mikael
F. Chau & Associates LLC
Ho Allen C.
Paschburg Donald B.
Siemens Aktiengesellschaft
Siemens Medical Solutions USA , Inc.
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