Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
272 words
In an apparatus for x-ray diagnosis comprising a unit rotatable about a vertical axis and having an x-ray tube and an opposed holder for x-ray film, a support for the head of a patient disposed between said x-ray tube and said holder, shutter means disposed in front of said holder for passage of x-rays to said film for producing tomograms, x-ray detector means disposed in a position for receiving at least the x-ray radiation passing through the jaw of a patient during the entire duration of a recording and for providing an electrical signal corresponding to the actual x-ray dose output, adjustable means for producing a reference electrical signal corresponding to the desired exposure time for the x-ray film, energizing means for said x-ray tube, and an x-ray dose regulator means having a first input for receiving the electrical signal from the detector means and a second input for receiving the reference electrical signal, said regulator means activating the energizing means to regulate the x-ray dose output supplied to the film to provide an optimum exposure thereof in response to a comparison of the actual x-ray dose output to the reference electrical signal, the improvements comprising means for producing an output signal related to the speed of transport of the holder and film, and means for receiving said output signal and adjusting the reference electrical signal of said adjustable means in relation thereto so that the reference signal for a desired value x-ray dose output is adjusted as a function of the speed of transport of the holder and film in addition to its dependent on the exposure time of the film.
Claim 2
Dependent Claim
272 words
In an apparatus for x-ray diagnosis comprising a unit rotatable about a vertical axis and having an x-ray tube and an opposed holder for x-ray film, a support for the head of a patient disposed between said x-ray tube and said holder, shutter means disposed in front of said holder for passage of x-rays to said film for producing tomograms, x-ray detector means disposed in a position for receiving at least the x-ray radiation passing through the jaw of a patient during the entire duration of a recording and for providing an electrical signal corresponding to the actual x-ray dose output, adjustable means for producing a reference electrical signal corresponding to the desired exposure time for the x-ray film, energizing means for said x-ray tube, and an x-ray dose regulator means having a first input for receiving the electrical signal from the detector means and a second input for receiving the reference electrical signal, said regulator means activating the energizing means to regulate the x-ray dose output supplied to the film to provide an optimum exposure thereof in response to a comparison of the actual x-ray dose output to the reference electrical signal, the improvements comprising means for producing an output signal related to the speed of transport of the holder and film, and means for receiving said output signal and adjusting the reference electrical signal of said adjustable means in relation thereto so that the reference signal for a desired value x-ray dose output is adjusted as a function of the speed of transport of the holder and film in addition to its dependent on the exposure time of the film.
Claim 3
Dependent Claim
29 words
In an apparatus according to claim 1, wherein said means for producing the output signal related to the speed of transport of the holder and film comprises a tachogenerator.
Claim 4
Dependent Claim
23 words
In an apparatus according to claim 2, wherein said means for regulating the reference electrical signal comprises an electromotor coupled to said tachogenerator.
Claim 5
Dependent Claim
41 words
In an apparatus according to claim 3, wherein said adjustable means comprises a reference signal transmitter with an adjustable tap, said electromotor being coupled to said adjustable tap to vary its position in response to the output signal of the tachogenerator.
Claim 6
Dependent Claim
30 words
In an apparatus according to claim 4, wherein said tap is manually adjustable for regulating the reference value of the x-ray dose output to the sensitivity of the x-ray film.