A multichannel, high linearity current digitizer for digital subtraction angiography

An experiment studying the application of synchrotron radiation for transvenous coronary angiography requires special electronics to read out a 600-element Si(Li) detector. To obtain high image quality, the electronic system must digitize the current in all 600 elements every 2 ms with a dynamic ran...

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Bibliographic Details
Published in:IEEE transactions on nuclear science 1988-02, Vol.35 (1), p.205-208
Main Authors: Nakamura, M., Katz, J.E., Thompson, A.C.
Format: Article
Language:English
Subjects:
Angiography
Costs
Dynamic range
Image quality
Linearity
Radiation detectors
Signal design
Synchrotron radiation
Table lookup
Voltage
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Summary:An experiment studying the application of synchrotron radiation for transvenous coronary angiography requires special electronics to read out a 600-element Si(Li) detector. To obtain high image quality, the electronic system must digitize the current in all 600 elements every 2 ms with a dynamic range of 40000 and a maximum nonlinearity of 0.02%. Each channel of electronics contains a current-to-voltage amplifier with computer-controlled gain and offset followed by a voltage-to-frequency converter used in the reciprocal counting mode. A high-speed digital readout method using a lookup table, digital multiplier and direct memory interface was developed. The entire system has been designed to have a low cost per channel and to be easily expanded by 1200 signal channels.< >
ISSN:0018-9499
1558-1578
DOI:10.1109/23.12708