|Publication number||USRE41197 E1|
|Application number||US 11/800,521|
|Publication date||Apr 6, 2010|
|Filing date||May 4, 2007|
|Priority date||Feb 18, 2000|
|Also published as||DE60114573D1, DE60114573T2, EP1259162A1, EP1259162B1, US6731717, US6891921, US20030118147, US20040247072, WO2001060257A1|
|Publication number||11800521, 800521, US RE41197 E1, US RE41197E1, US-E1-RE41197, USRE41197 E1, USRE41197E1|
|Original Assignee||Palodex Group Oy|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (19), Classifications (11), Legal Events (1)|
|External Links: USPTO, USPTO Assignment, Espacenet|
The present application is a continuation application of U.S. patent application Ser. No. 10/204,104, filed Oct. 10, 2002, now U.S. Pat. No. 6,731,717.That application is the U.S. national stage application of International Application PCT/FI01/00137, filed Feb. 14, 2001, which application was published on Aug. 23, 2001 as International Publication WO 01/60257. The International Application claims the priority of Finnish Patent Application 20000369, filed Feb. 18, 2000.
The present application is a reissue application of U.S. patent application Ser. No. 10/795,638, filed Mar. 8, 2004, now U.S. Pat. No. 6,891,921. That application is a continuation of application Ser. No. 10/204,104, filed as Application No. PCT/FI01/00137 on Feb. 14, 2001, now U.S. Pat. No. 6,731,717. The International Application claims the priority of Finnish Patent Application 20000369, filed Feb. 18, 2000.
The present invention relates to a method for cephalometric imaging using an apparatus which comprises an X-ray source, a line detector camera equipped with a digital detector, which line detector camera is located to a position far away from the X-ray source for carrying out cephalometric imaging while the slot of the line detector camera is substantially vertical, whereby in cephalometric imaging, an X-ray beam located substantially on the vertical plane is directed from the X-ray source through the object being imaged, and the X-ray source is at the same time turned about the rotation centre located between the X-ray source and the line detector camera in order to scan the object being imaging in the horizontal direction, whereby the line detector camera is moved during the scanning movement in such a way that the ray beam meets the slot of the line detector camera. The publication U.S. Pat. No. 5,511,106 discloses this type of scanning method for cephalometric imaging.
When cephalometric imaging is carried out in the manner described above, the vertical ratio of enlargement remains the same as without the scanning movement, but the horizontal ratio of enlargement, on the other hand, changes because the rotation centre changes into the effective focal spot instead of the focal spot of the X-ray source. Accordingly, the object of the present invention is to provide a method by means of which the ratios of enlargement in cephalometric imaging can be maintained the same in the vertical and horizontal directions in cephalometric imaging, which is carried out by means of the turning movement taking place about the rotation centre of the X-ray source. A further object is to provide a method which can be implemented by using existing panoramic X-ray imaging apparatuses, which already comprise the means needed to perform the required movements. To achieve this object, the method relating to the invention is characterised in that in the method, the effective focal spot is transferred from the rotation centre to the focal spot of the X-ray source by transferring the rotation centre by means of a transverse linear movement with respect to the ray beam.
The invention is described in greater detail in the following, with reference to the accompanying drawings, in which:
The apparatus 1 according to
To the support part 2 is connected a supporting arm 3, at the other end of which is the cephalometric imaging apparatus 10, which comprises a line detector camera 8 to be placed behind the object being imaged, and a secondary collimator 9 to be placed in front of the object being imaged. In cephalometric imaging, the patient's head is scanned by means of the ray beam 11 from right to left or vice versa.
In the method according to the invention, cephalometric imaging is carried out by turning the X-ray source 5 about a rotation centre 13 to image the patient's head 12 by means of a vertically positioned ray beam 11.
It is for this reason that, according to the invention, in cephalometric imaging the rotation centre 13 is arranged to be transferred by linear movement transversely with respect to the ray beam 11, as shown by reference marking A in FIG. 1.
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|U.S. Classification||378/38, 378/197, 378/191|
|International Classification||A61B6/00, A61B6/14|
|Cooperative Classification||A61B6/501, A61B6/589, A61B6/06, A61B6/588|
|European Classification||A61B6/50B, A61B6/06|