Detector module for CT and/or PET and/or SPECT tomography
A detector module is for CT and/or PET and/or SPECT examinations, and includes a number of measuring channels. Each measuring channel includes a direct converter for directly converting incident measuring radiation into analog electric signals, a pulse generator connected to the direct converter, for generating counting pulses as a function of the received electric signals, and a counting device that counts the received counting pulses over a prescribable time period and outputs the result. Arranged between the counting device and the pulse generator is an externally drivable changeover unit that can be used to switch over between the counting device and an event detector that registers and outputs for each received counting pulse the time and the associated measuring channel or an item of location information assigned to this measuring channel. The present detector module is of simple design.
1. A detector module, comprising:
a plurality of measuring channels, each measuring channel including
a direct converter, adapted to directly convert incident measuring radiation into analog electric signals,
a pulse generator, connected to the direct converter, adapted to generate counting pulses as a function of analog electric signals,
a counting device, adapted to count the counting pulses over a prescribable time period and output a result, and
an externally drivable changeover unit, arranged between the counting device and the pulse generator, adapted to switch over between the counting device and an event detector that registers and outputs, for each counting pulse, at least one of a time and an associated measuring channel, and an item of location information assigned to the associated measuring channel.
2. The detector module as claimed in claim 1 , wherein the direct converter includes a semiconductor detector.
3. The detector module as claimed in claim 2 , wherein the semiconductor detector is formed from at least one of HgI 2 , CdZnTe, CdTe and TlBr.
4. The detector module of claim 3 , wherein the detector module is for at least one of computed tomography (CT), positron emission tomography (PET) and Single Photon Emission Computed Tomography (SPECT).
5. The detector module as claimed in claim 3 , wherein the pulse generator includes a threshold logic unit.
6. The detector module as claimed in claim 5 , wherein the threshold logic unit is formed from a number of parallel-connected comparators, each with a threshold, each comparator being assigned a counter of the counting device, in order to increment the respectively assigned counter by one unit only whenever quantum energy of a radiation quantum of measured radiation exceeds the threshold of the respective comparator.
7. The detector module of claim 2 , wherein the detector module is for at least one of computed tomography (CT), positron emission tomography (PET) and Single Photon Emission Computed Tomography (SPECT).
8. The detector module as claimed in claim 2 , wherein the pulse generator includes a threshold logic unit.
9. The detector module as claimed in claim 8 , wherein the threshold logic unit is formed from a number of parallel-connected comparators, each with a threshold, each comparator being assigned a counter of the counting device, in order to increment the respectively assigned counter by one unit only whenever quantum energy of a radiation quantum of measured radiation exceeds the threshold of the respective comparator.
10. The detector module as claimed in claim 1 , wherein the pulse generator includes a threshold logic unit.
11. The detector module as claimed in claim 10 , wherein the threshold logic unit is formed from a number of parallel-connected comparators, each with a threshold, each comparator being assigned a counter of the counting device, in order to increment the respectively assigned counter by one unit only whenever quantum energy of a radiation quantum of measured radiation exceeds the threshold of the respective comparator.
12. The detector module of claim 1 , wherein the detector module is for at least one of computed tomography (CT), positron emission tomography (PET) and Single Photon Emission Computed Tomography (SPECT).
13. A detector module, comprising:
a plurality of measuring channels, each measuring channel including
means for directly converting incident measuring radiation into analog electric signals,
means for generating counting pulses as a function of the analog electric signals,
means for counting the generated counting pulses over a prescribable time period and outputting a result, and
means, arranged between the means for counting and the means for generating, for switching over between the means for counting and an event detector that registers and outputs, for each generated counting pulse, at least one of a time and an associated measuring channel, and an item of location information assigned to the associated measuring channel.
14. The detector module as claimed in claim 13 , wherein the means for directly converting includes a semiconductor detector.
15. The detector module as claimed in claim 14 , wherein the semiconductor detector is formed from at least one of HgI 2 , CdZnTe, CdTe and TlBr.
16. The detector module as claimed in claim 13 , wherein the means for generating includes a threshold logic unit.
17. The detector module as claimed in claim 16 , wherein the threshold logic unit is formed from a number of parallel-connected comparators, each with a threshold, each comparator being assigned a counter of the means for counting, in order to increment the respectively assigned counter by one unit only whenever quantum energy of a radiation quantum of the received measured radiation exceeds the threshold of the respective comparator.
18. The detector module of claim 13 , wherein the detector module is for at least one of computed tomography (CT), positron emission tomography (PET) and Single Photon Emission Computed Tomography (SPECT).