Spectrum-preserving heel effect compensation filter made...

Details Spectrum-preserving heel effect compensation filter made... Spectrum-preserving heel effect compensation filter made...

2008-01-23

2011-11-15

Thomas, Courtney (Department: 2882)

X-ray or gamma ray systems or devices

Beam control

Filter

C378S121000

Reexamination Certificate

active

08059787

ABSTRACT:
It is described a filter (300) for at least partially compensating for an X-ray tube (10) the target angle heel effect and preserving the tungsten spectrum of the X-rays. The filter (300) has an anode side (302) and a cathode side (304), wherein the cathode side (304) has a higher attenuation coefficient than the anode side (302). The attenuation coefficient is determined to at least partially compensate for the target angle heel effect. The filter (300) is from the same material as an anode plate (110) or the anode (108) of the X-raysource (10) which is usually tungsten or a tungsten alloy.

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patent: 2005010916 (2005-02-01), None
patent: 2005092195 (2005-10-01), None
Mori, S., et al.; Prototype heel effect compensation filter for cone-beam CT; 2005; Phys. Med. Biol.; 50:N359-N370.
Moore, C. J., et al.; Cone beam CT with zonal filters for simultaneous dose reduction, improved target contrast and automated set-up in radiotherapy; 2006; Phys. Med. Biol.; 51:2191-2204.

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