X-ray or gamma ray systems or devices – Electronic circuit – Exposure timer
Reexamination Certificate
2007-01-09
2007-01-09
Glick, Edward J. (Department: 2882)
X-ray or gamma ray systems or devices
Electronic circuit
Exposure timer
C378S054000, C378S108000, C378S095000
Reexamination Certificate
active
10497342
ABSTRACT:
The invention relates to a method to measure the entrance dose of a radiology apparatus of the type comprising an X-ray beam source, and a detector for the X-ray beam after it has passed an object of interest carried on a table placed between the source and the detector, wherein the X-ray beam source is placed above said table and wherein the distance between the X-ray beam source and the object is estimated taking into account the object's morphology, for determining said entrance dose. An attenuation-ratio is calculated depending on energy-levels of the X-ray beam leaving the X-ray beam source and arriving at the detector respectively, and that the object's thickness is calculated depending on said attenuation-ratio, said thickness together with the table-position defining said distance between the X-ray beam source and the object.
REFERENCES:
patent: 4158138 (1979-06-01), Hellstrom
patent: 4590603 (1986-05-01), Relihan et al.
patent: 4703496 (1987-10-01), Meccariello et al.
patent: 6094468 (2000-07-01), Wilting et al.
patent: 6222907 (2001-04-01), Gordon, III et al.
Glick Edward J.
Kiknadze Irakli
Koninklijke Philips Electronics , N.V.
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