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US 6,324,244 B1Granted
Computed tomography apparatus
AssigneeU.S. Philips Corporation
InventorsJosef Lauter, Stefan Schneider, Herfried Karl Wieczorek
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AssigneeU.S. Philips Corporation
InventorsJosef Lauter, Stefan Schneider, Herfried Karl Wieczorek
Estimating the term…
The invention relates to a computed tomography apparatus which includes a radiation source, a detector device and an analog-to-digital converter for converting the detector output signals into digital values. In order to realize a computed tomography apparatus in which the number of binary positions required for the encoding of the signal entering the analog-to-digital converter is reduced while using simple components which operate with a high degree of reliability, use is made of a read-out amplifier (1) which precedes the analog-to-digital converter (10), has a plurality of gain factors and a control system (12) for the relevant gain factor which, when a predetermined limit value of the integrated input signal is reached, automatically selects an appropriate, each time lower gain factor for the step-wise linear approximation of a proportional ratio between the digital values and the square root of the detector output signals.
A computed tomography apparatus which includes a radiation source, a detector device and an analog-to-digital converter for converting the detector output signals into digital values, characterized in that the apparatus includes a read-out amplifier (1) which precedes the analog-to-digital converter (10) and has a plurality of gain factors and a control system (12) for the respective, gain factor which, when a predetermined limit value of the integrated input signal is reached, automatically selects an appropriate, each time lower gain factor for the step-wise linear approximation of a proportional ratio between the digital values and the square root of the detector output signals.
Dependencies are inferred from the claim text.