Proportional attenuation of radiation in brachytherapy...

Details Proportional attenuation of radiation in brachytherapy... Proportional attenuation of radiation in brachytherapy...

2008-02-26

2011-11-22

Marmor, II, Charles A (Department: 3735)

Surgery

Radioactive substance applied to body for therapy

Radioactive substance placed within body

C250S496100, C250S515100, C250S519100

Reexamination Certificate

active

08062203

ABSTRACT:
Attenuating masks for selective attenuation of radiation, particularly from an x-ray source in brachytherapy, employ materials having atomic number in a specific range, so as to attenuate radiation dose intensity generally proportionally through a range of distance from the source. Some preferred attenuation materials are silver and molybdenum. A set of small masks can be provided for a particular design of catheter that holds a radiation source, each mask having a size and shape to define a different solid angle of masking, so that in a brachytherapy procedure, sensitive tissue such as bone or skin can be protected by proper selection of and positioning of the attenuating mask, to reduce the dose intensity to that tissue.

REFERENCES:
patent: 2003/0149327 (2003-08-01), Chin et al.
patent: 2006/0173235 (2006-08-01), Lim et al.
patent: 2007/0191668 (2007-08-01), Lubock et al.
patent: 2008/0039715 (2008-02-01), Wilson et al.

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