Patent EP0215757A2 successfully refreshed from Google Patents.
EP0215757A2
Expired / Lapsed
EP
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Control system of an X-ray apparatus for panoramic tomography
Assignee: Planmeca Oy
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Filing: 1986-09-02
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Granted: —
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Expires: 2006-09-02
Abstract
Abstract A control system of an X-ray apparatus for panoramic tomography for controlling the functions of panoramic equipment, such as the transport of the X-ray film and the rotation of the arm (11) to which the tube head (10) of the X-ray generator (40) and the cartridge (20) for the X-ray film (RF) with the film transport equipment (21, 22, 23, 24, 25) are fastened. The control system (100) controls, on the basis of control data and program stored into it, the speed (v d ) of the rotary motion motor (31) of said arm (11) and the speed v f ) of the film transport motor (21) and the distribution of these speeds (v d , v,) during an exposure sequence (to) independently of each other. With the panoramic device it is possible to sharply and with suitable exposing time photograph dental systems of varying sizes (figure 4) and varying shapes (figure 5). In addition to the speeds (v f , v d ) of said motors (21,31), the control system (100) may also control the anode current and/or the anode voltage of the X-ray generator (40) during the exposure sequence (to).
Inventors
- 👤 Arto Virta
- 👤 Pekka Strömmer
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 00:46
CPC Classifications
A; A61; A61B; A61B6/00; A61B6/50; A61B6/51
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
166 words
A control system of an X-ray apparatus for panoramic tomography for controlling the functions of panoramic equipment, such as the transport of the X-ray film and the rotation of the arm (11) to which the tube head (10) of the X-ray generator (40) and the cartridge (20) for the X-ray film (RF) with the film transport equipment (21, 22, 23, 24, 25) are fastened, characterized in that the control (100) system is, on the basis of control data and program stored into it, arranged to control both the speed (v d ) of the rotary motion motor (31) of said arm (11) and the speed (v f ) of the film transport motor (21) and the distribution of these speeds (v d , v f ) during an exposure sequence (t 0 ) independently of each other so that it is possible to sharply and with suitable exposing time photograph dental systems of varying sizes (figure 4) and varying shapes (figure 5) with a panoramic device.
Claim 2
Dependent Claim
166 words
A control system of an X-ray apparatus for panoramic tomography for controlling the functions of panoramic equipment, such as the transport of the X-ray film and the rotation of the arm (11) to which the tube head (10) of the X-ray generator (40) and the cartridge (20) for the X-ray film (RF) with the film transport equipment (21, 22, 23, 24, 25) are fastened, characterized in that the control (100) system is, on the basis of control data and program stored into it, arranged to control both the speed (v d ) of the rotary motion motor (31) of said arm (11) and the speed (v f ) of the film transport motor (21) and the distribution of these speeds (v d , v f ) during an exposure sequence (t 0 ) independently of each other so that it is possible to sharply and with suitable exposing time photograph dental systems of varying sizes (figure 4) and varying shapes (figure 5) with a panoramic device.
Claim 3
Dependent Claim
50 words
A control system in accordance with claim 1, characterized in that, in addition to the speeds (v f , v d ) of said motors (21, 31), the control system (100) also controls the anode current and/or the anode voltage of the X-ray generator (40) during the exposure sequence (t0).
Claim 4
Dependent Claim
42 words
A control system in accordance with claim 1 or 2, characterized in that the control system (100) also controls the aperture of the automatic primary blind (15) (figure 8) and/or the change of apertures (62) of the blind (figures 9 and 10).
Claim 5
Dependent Claim
89 words
A control system in accordance with one of claims 1 to 3, characterized in that the control system comprises a combination of a microprocessor (108) comrising the program memory (106) and the working memory (105), equipment (102, 103) for controlling the system, a connecting part connected to the bus (104) of the microprocessor (108), with which connecting part the microprocessor (108) is arranged to control the rotating directions and speed distributions of the rotary motor (31) of the arm (11) of the device and the film transport motor (21).
Claim 6
Dependent Claim
35 words
A control system in accordance with claim 4, characterized in that said connecting part controls, in addition to the motors (21, 31), also the motor (14) of the primary blind (15) via control electronics (112).
Claim 7
Dependent Claim
54 words
A control system in accordance with claims 4 or 5, characterized in that said connecting part of the microprocessor (108) also controls the X-ray genarator (40) feeding the tube head (10) of the device, and that the microprocessor (108) is arranged to receive status information from the tube end (10) via the connecting part.
Claim 8
Dependent Claim
79 words
A control system in accordance with one of claims I to 6, characterized in that the control system (100) is programmed to control both the speed distribution (G) of the rotary motor (31) of said arm (11) and the speed distribution (H) of the film transport motor (21) independently of each other so that it is, under control of the system (100), possible to photograph with constant exposure in certain limits a chin profile of any shape or size.
Claim 9
Dependent Claim
36 words
A control system in accordance with one of claims 1 to 7, characterized in that the normal photographings are carried out with a constant anode voltage and/or a constant anode current of the X-ray generator (40).
Claim 10
Dependent Claim
55 words
A control system in accordance with one of claims 2 to 7, characterized in that by controlling the anode voltage of the X-ray generator (40) only certain areas of the dental arch are photographed so that areas being outside this area will not be photographed in order to minimize the radiation load of the patient.
Claim 11
Dependent Claim
65 words
A control system in accordance with one of claims 1 to 9, characterized in that in order to minimize the radiation load of the patient, the primary blind (14, 15) is, when there is no need to photograph the patient over the full picture height, controlled by the control system (100) so that the unnecessary X-ray beam can be cropped off in the horizontal direction.
Claim 12
Dependent Claim
37 words
A control system in accordance with one of claims 1 to 10, characterized in that the system is programmed to photograph only small squares of the patient (P) such as regions of salivary glands and maxillary sinuses.
Claim 13
Dependent Claim
44 words
A control system in accordance with one of claims 1 to 11, characterized in that the control system (100) is arranged to control the anode current, the anode voltage and/or the exposure time of the X-ray tube in accordance with requirements of cephalostatic photography.
Claim 14
Dependent Claim
48 words
A control system in accordance with claim 12, characterized in that the control system (100) is arranged to control the adjustment of the tube head (10) with respect to the cephalostat and/or the control system (100) is adjusted to control the change of blind required by cephalostatic photography.
References Cited (Backward Citations)
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