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Digital-to-analog converter for multi-threshold counters that divide bits between resistor ladders and comparators

A comparator and resistor technology, used in digital-to-analog converters, analog-to-digital conversion, code conversion, etc., can solve problems such as increasing space requirements and restrictions, and achieve the effect of improving contrast.

Active Publication Date: 2019-08-30
SIEMENS HEALTHCARE GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Increased space requirements limit the size of the detector element

Method used

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  • Digital-to-analog converter for multi-threshold counters that divide bits between resistor ladders and comparators
  • Digital-to-analog converter for multi-threshold counters that divide bits between resistor ladders and comparators
  • Digital-to-analog converter for multi-threshold counters that divide bits between resistor ladders and comparators

Examples

Experimental program
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Embodiment Construction

[0056] figure 1 An exemplary embodiment of the concept of the X-ray detector 1 according to the invention according to the first embodiment is shown. The x-ray detector 1 has, for example, a detector element 3 . The detector element 3 has a first voltage source 5 , a switching element 71 , a second voltage source 81 and a discriminator unit 91 . The first voltage source 5 has an input voltage VDAC 13 . The first voltage source 5 also has a plurality of tapping points 7 . The first voltage source 5 can make available a plurality of first voltage values ​​at the tap point 7 . The first voltage values ​​are provided equidistantly and in a monotonic sequence. The first voltage source has at least 2 K+1 A tap point 7. The switch unit 71 includes N switch matrices 73 . The input 75 of the switch matrix 73 is conductively connected to the tapping point 7 of the monotonically sequential first voltage values ​​of the first voltage source 5 . A plurality of tapping points 7 is c...

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Abstract

An X-ray detector includes an N-channel digital-analogue converter controllable with K+L bits. In an embodiment, the digital-analogue converter includes a first voltage source to provide a plurality of first voltage values at tapping points; and a switch unit with N switch matrices, 2K inputs of the switch matrices being electrically conductively connected to 2K tapping points of the first voltage source. The digital-analogue converter also includes a second voltage source including N subunits. The X-ray detector further includes a discriminator unit including N comparators, at least one input of the comparators being electrically conductively connected to the associated output of the switch matrix and / or to the associated output of the subunit, so that the associated first voltage value and the associated second voltage value are associable with each comparator. A signal of an output of a pre-amplifier, and the associated first and second voltage values are comparable in the comparator.

Description

technical field [0001] The invention relates to an X-ray detector including an N-channel controllable digital-to-analog converter and a medical device. Background technique [0002] In the field of X-ray imaging (eg in computed tomography, angiography or radiography) counting direct conversion X-ray detectors may be used. X-ray radiation or photons can be converted into electrical pulses by means of suitable sensors. For example CdTe, CZT, CdZnTeSe, CdTeSe, CdMnTe, InP, TlBr2, HgI2, GaAs, or others can be used as sensor material. The electrical pulses are evaluated by an evaluation electronics system such as an integrated circuit (Application Specific Integrated Circuit, ASIC). [0003] In counting X-ray detectors, incident X-ray radiation is measured by counting electrical pulses triggered by the absorption of X-ray photons in the detector material. The size of the electrical pulse is generally proportional to the energy of the absorbed X-ray photons. By this means, spe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/66
CPCH03M1/662G01T1/247H03M1/68H03M1/808H03M1/785
Inventor M·格勒普E·格德尔T·祖托普
Owner SIEMENS HEALTHCARE GMBH
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