X-ray or gamma ray systems or devices – Electronic circuit – With display or signaling
Reexamination Certificate
2007-12-25
2007-12-25
Ho, Allen C. (Department: 2882)
X-ray or gamma ray systems or devices
Electronic circuit
With display or signaling
C378S204000, C378S205000, C378S206000, C250S336100, C250S370090, C250S370100
Reexamination Certificate
active
11415990
ABSTRACT:
A unit (11) with a length (L) is utilized in a device for indicating the position of an edge (7a) of a first area (7) which is irradiated by an x-ray radiation source (2) in relation to an edge (9a) of a second area, completely or partially coinciding with the first area, which second area is illuminated by a light source. The unit is provided with a first and second parts separated by a mark (12), which parts are intended to extend inside the second area and outside the second area respectively. The unit (11) comprises x-ray radiation-indicating elements (14, 22) that assume a first indication state in the presence of x-ray radiation (6) and a second indication state in the absence of x-ray radiation. The position indication can be determined by means of the said mark and indication states. The invention also relates to an arrangement and a method for the said position indication. The unit can have small external dimensions, and constitutes a unit that is considerably simplified and easy to handle, while retaining a high degree of accuracy.
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Unfors Direct X-ray Ruler brochure.
“Written Opinion for Application No. PCT/SE2004/001539, date mailed Feb. 15, 2005”, 3 pages.
Van Deer Meer, Frits, et al., “A new x-ray and light field superimposition detector”,Med. Phys., vol. 19, No. 3, (May/Jun. 1992), 587.
Ho Allen C.
Schwegman Lundberg & Woessner, P.A.
Unfors Instruments AB
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