Medical diagnostics system having optimized signal acquisition for radiation exposure control

Claim 2

A medical diagnostic system comprising: an x-ray transmitter; an x-ray image intensifier for receiving x-rays from said transmitter after passing through an examination subject, said x-ray image intensifier generating an optical image corresponding to an x-ray image of said examination subject; a light sensor disposed in a path of said optical image, said light sensor generating an output signal; control means supplied with said output signal of said light sensor for controlling the operation of said x-ray transmitter dependant on said output signal; and a high-pass filter connected between said light sensor and said control means through which said output signal passes.

Claim 3

A system as claimed in claim 1, wherein said light sensor comprises: a matrix sensor which generates a plurality of output signals; a first matrix memory to which said output signals of said matrix sensor are supplied; a second matrix memory to which said output signals of said matrix sensor are supplied; a high-pass filter connected at an output of said second matrix memory; and means for subtracting said output signals stored in said first matrix memory from the high-pass filtered output signals stored in said second memory, for supply to said control means.

Claim 4

A system as claimed in claim 2, further comprising means for supplying said output signals of said matrix sensor to said second matrix memory at predetermined time intervals.

Claim 5

A system as claimed in claim 2, wherein the respective matrices of said first and second matrix memories are identical.

Claim 6

A system as claimed in claim 2, wherein said second matrix memory has a matrix which is reduced in comparison to a matrix of said first matrix memory.

Claim 7

A medical diagnostic system comprising: an x-ray transmitter; an x-ray image intensifier disposed to receive x-rays from said x-ray transmitter after passing through an examination subject, said x-ray image intensifier generating an optical image corresponding to an x-ray image of said examination subject; a first light sensor disposed in a path of said optical image, and generating a first output signal; a second light sensor disposed in the path of said optical image in the form of a matrix sensor, and generating second output signals; a matrix memory connected to said second light sensor for storing said second output signals; first means following said matrix memory for electrically simulating a dominant image; second means following said matrix memory for generating an arbitrarily selectable dominant image; difference-forming means for forming a difference of signals from said first and second means; means for superimposing said difference on a predetermined control signal; and control means, supplied with said difference superimposed on said predetermined control signal, for controlling the operation of said x-ray transmitter.

Claim 8

A medical diagnostic system comprising: an x-ray transmitter; an x-ray image intensifier disposed to receive x-rays from said x-ray transmitter after passing through an examination subject, said x-ray image intensifier generating an optical image corresponding to an x-ray image of said examination subject; a first light sensor disposed in a path of said optical image, and generating a first output signal; a second light sensor disposed in the path of said optical image in the form of a matrix sensor, and generating second output signals; a matrix memory connected to said second light sensor for storing said second output signals; first means following said matrix memory for electrically simulating a dominant image; second means following said matrix memory for generating an arbitrarily selectable dominant image; difference-forming means for forming a difference of signals from said first and second means; means for superimposing said difference on a predetermined control signal; and control means, supplied with said difference superimposed on said predetermined control signal, for controlling the operation of said x-ray transmitter.