US4063074A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for measuring radiation absorption or radiation emission distributions in a plane through a body
Assignee: US Philips Corp
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Filing: 1975-09-04
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Granted: 1977-12-13
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Expires: 1995-09-04
Abstract
Abstract For measuring the absorption from measuring values whereby the radiation attenuation in a plane of a body is measured, a large number of calculations must be performed. When use is made of a digital computer, a large quantity of storage locations and a long calculating time are required. According to the invention, use is made of a charge storage tube wherein the correction values calculated in a preprocessing unit on the basis of the measuring values are superimposed, so that a substantial reduction of the calculation time and a reduction of the number of storage locations are realized.
Inventors
- 👤 Wolfgang Wagner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:06
CPC Classifications
A; A61; A61B; A61B6/00; A61B6/02; A61B6/025; A61B6/42; A61B6/4208; A61B6/4258; G; G01; G01N; G01N23/00; G01N23/02; G01N23/06; G01T; G01T1/00; G01T1/29; G01T1/2914; G01T1/2985; H; H05; H05G; H05G1/00; H05G1/08; H05G1/26; Y; Y10; Y10S; Y10S378/00; Y10S378/901
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
200 words
A device for measuring the spatial distribution of the absorption or emission of radiation in a plane of a body, comprising: means for measuring the absorption or emission of the body in a large number of directions all situated in the plane, the measurements forming a multiplicity of measuring series, each measuring series comprising a multiplicity of measuring values measured along approximately parallel straight lines, the lines of different series being oriented in different directions; a preprocessing unit for calculating a correction value corresponding to each measuring value from the measuring values of the same series in accordance with a predetermined function, a cathode-ray tube device having a charge storage target area for superposing correction values, the target area being scanned in parallel strips corresponding in position and direction with the straight lines of the measuring values, the amount of charge added or taken away from each strip being determined by the correction value of the corresponding measuring value; and a control section for controlling the preprocessing unit and the cathode-ray tube device such that while the cathode-ray tube scans a strip corresponding to a measuring value, the preprocessing unit calculates the correction value corresponding to the next measuring value.
Claim 2
Independent Claim
200 words
A device for measuring the spatial distribution of the absorption or emission of radiation in a plane of a body, comprising: means for measuring the absorption or emission of the body in a large number of directions all situated in the plane, the measurements forming a multiplicity of measuring series, each measuring series comprising a multiplicity of measuring values measured along approximately parallel straight lines, the lines of different series being oriented in different directions; a preprocessing unit for calculating a correction value corresponding to each measuring value from the measuring values of the same series in accordance with a predetermined function, a cathode-ray tube device having a charge storage target area for superposing correction values, the target area being scanned in parallel strips corresponding in position and direction with the straight lines of the measuring values, the amount of charge added or taken away from each strip being determined by the correction value of the corresponding measuring value; and a control section for controlling the preprocessing unit and the cathode-ray tube device such that while the cathode-ray tube scans a strip corresponding to a measuring value, the preprocessing unit calculates the correction value corresponding to the next measuring value.
Claim 3
Dependent Claim
102 words
A device as defined in claim 1 wherein the preprocessing unit comprises: a first shift register for receiving and storing successive measuring values as they are measured; a second shift register coupled to the first shift register for receiving and storing an entire measuring series from the first shift register; a third shift register for storing weighting factors; a multiplication unit coupled to the second and third shift registers for multiplying the measuring values of a stored measuring series by corresponding weighting factors; and an accumulating adding member coupled to the multiplication unit for adding the products calculated by the multiplication unit.
Claim 4
Dependent Claim
34 words
A device as defined in claim 2 wherein the second and third shift registers are shifted relative to each other for calculating correction values corresponding to different measuring values of the stored measuring series.
Claim 5
Dependent Claim
115 words
A device as claimed in claim 1, wherein the correction values are superimposed by means of two electronic storage tubes, the deflection systems of which are controlled in synchronism with each other, the electron beam of the one storage tube being modulated with the positive correction values and the electron beam of the other storage tube being modulated with the negative correction values, the negative correction values being applied to the control grid of the storage tube via an inverter stage, the charge distribution on the targets of the two storage tubes being read in synchronism with each other and being applied, via a differential amplifier, to an image display unit, or an image store.
Claim 6
Dependent Claim
58 words
A device as claimed in claim 1, wherein the cathode-ray tube device comprises a single electronic storage tube, the electron beam intensity of which is controlled by the amount of the correction value, the voltage between cathode and target being switched from a high value to a low value in accordance with the sign of the correction value.
Claim 7
Dependent Claim
77 words
A device as claimed in claim 1, wherein the cathode-ray tube device comprises a vidicon tube which is focussed on the display screen of a vidicon display tube the deflection of the two cathode-ray tubes being synchronously controlled, and, after uniform illumination of the vidicon tube, the scanning beam thereof being controlled by the positive correction values, the electron beam of the video display tube, however, being controlled by the negative correction values via an inverter stage.
Claim 8
Dependent Claim
86 words
A device as claimed in claim 1, wherein the electron beam of a video display tube directed in accordance with the position and the direction during the measurement of the measuring value, is modulated each time with the amount of the correction value, a titus tube being optically coupled to the display screen of the video display tube, the polarity of the direct voltage applied to the outer electrodes of the titus tube being switched over in accordance with the sign of the applied correction values.
Claim 9
Dependent Claim
33 words
A device as claimed in claim 1, wherein the electron beam of the cathode ray tube device is focussed such that the half-width value thereof corresponds approximately to the width of one strip.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-12-12 | 1981-06-13 | 1981-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-12 | 1985-06-13 | 1985-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-12 | 1989-06-13 | 1989-12-13 | $7700.00 | Window Closed / Lapsed |