US4583240A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Data acquisition circuitry for use in computerized tomography system
Assignee: General Electric Co
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Filing: 1983-08-15
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Granted: 1986-04-15
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Expires: 2003-08-15
Abstract
Abstract A digital acquisition system for use in a computerized radiation tomography system employs track and hold means associated with each channel of the radiation detector in the tomography system. Each channel of the radiation detector is connected to a voltage follower transistor and resistor. A signal from the voltage follower transistor and resistor is applied through a Butterworth filter and amplifier to a transconductance amplifier which provides a signal for application to a charge storage capacitor. The capacitor is connected to the detector channel except during each limited period of time when the charge is held for measurement and conversion to a digital form. The data acquisition system has fewer components, and the simplicity of the circuitry increases the circuit reliability.
Inventors
- 👤 Ronald A. Gatten
- 👤 Peter I. Granchukoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:19
CPC Classifications
A; A61; A61B; A61B6/00; A61B6/02; A61B6/03; A61B6/032
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
71 words
A data acquisition circuit for use with a radiation detector and the like comprising voltage follower transistor means, amplification and filter means connected with said voltage follower transistor means, transconductance amplifier means connected to receive a signal from said amplification and filter means, charge storage means connected to receive a signal from said transconductance amplifier means, and analog to digital conversion means connected to receive charge on said charge storage means.
Claim 2
Dependent Claim
71 words
A data acquisition circuit for use with a radiation detector and the like comprising voltage follower transistor means, amplification and filter means connected with said voltage follower transistor means, transconductance amplifier means connected to receive a signal from said amplification and filter means, charge storage means connected to receive a signal from said transconductance amplifier means, and analog to digital conversion means connected to receive charge on said charge storage means.
Claim 3
Dependent Claim
46 words
The data acquisition circuit as defined by claim 1 wherein said voltage follower transistor means includes a field effect transistor and a serially connected resistor, said amplification and filter means being connected to a common terminal of said field effect transistor and said serially connected resistor.
Claim 4
Dependent Claim
64 words
For use in measuring signals in a multichannel radiation detector and the like, a plurality of sample and hold means with each sample and hold means connected with a channel of said multiple channel radiation detector, each sample and hold means including transconductance amplifier means for receiving a signal and charge storage means connected to receive an output signal from said transconductance amplifier means.
Claim 5
Dependent Claim
64 words
For use in measuring signals in a multichannel radiation detector and the like, a plurality of sample and hold means with each sample and hold means connected with a channel of said multiple channel radiation detector, each sample and hold means including transconductance amplifier means for receiving a signal and charge storage means connected to receive an output signal from said transconductance amplifier means.
Claim 6
Dependent Claim
45 words
The plurality of sample and hold means as defined by claim 3 wherein each sample and hold means further includes a voltage follower transistor means connected with said channel, and amplification and filter means interconnecting said voltage follower transistor means with said transconductance amplifier means.
Claim 7
Dependent Claim
48 words
The plurality of sample hold means as defined by claim 4 wherein said voltage follower transistor means includes a field effect transistor and a serially connected resistor, said amplification and filter means being connected to a common terminal of said field effect transistor and said serially connected resistor.
Claim 8
Dependent Claim
22 words
The plurality of sample and hold means as defined by claim 5 wherein said amplification and filter means includes a Butterworth filter.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-04-14 | 1989-10-14 | 1990-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-14 | 1993-10-14 | 1994-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-14 | 1997-10-14 | 1998-04-15 | $7700.00 | Window Closed / Lapsed |