EP0220770A2
Expired / Lapsed
EP
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Radioscopic image former
Assignee: Optische Industrie de Oude Delft NV
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Filing: 1986-10-20
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Granted: —
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Expires: 2006-10-20
Abstract
Abstract A radioscopic image former comprise a slit between an X-ray source and a subject to produce an X-ray fan beam to scan the subject. The transmission of the slit is adjusted locally during the scanning depending on local absorptions in the subject. The X-ray fan beam is cyclically modulated. The local modulation frequency depends on the coordinate in the longitudinal direction of the slit. The slit comprises a number of tongues each tongue being excited at or near its resonant frequency. Each tongue has its own frequency or phase and acts as a frequency-selective element.
Inventors
- 👤 Sipko Luu Boersma
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 23:26
CPC Classifications
H; H05; H05G; H05G1/00; H05G1/08; H05G1/60; A; A61; A61B; A61B6/00; A61B6/06; G; G21; G21K; G21K1/00; G21K1/02; G21K1/04; G21K1/043; H05G1/26; H05G1/30; H05G1/36
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
80 words
Radioscopic image former in which the X-ray beam passes through a moving slit-shaped X-ray diaphragm between source and subject to be imaged so that the subject is scanned by a flat X-ray beam, the transmission of said slit being adjusted LocaLLy during the scanning depending on LocaL absorptions in said subject, characterized in that said X-ray beam is at the same time cycLicaLLy modulated, the LocaL modulation frequencies depending on the coordinate in the LongitudinaL direction of the said sLit.
Claim 2
Dependent Claim
80 words
Radioscopic image former in which the X-ray beam passes through a moving slit-shaped X-ray diaphragm between source and subject to be imaged so that the subject is scanned by a flat X-ray beam, the transmission of said slit being adjusted LocaLLy during the scanning depending on LocaL absorptions in said subject, characterized in that said X-ray beam is at the same time cycLicaLLy modulated, the LocaL modulation frequencies depending on the coordinate in the LongitudinaL direction of the said sLit.
Claim 3
Dependent Claim
22 words
Radioscopic image former according to CLaim 1, characterized in that the said cyclic modulations are performed by one or more moving rasters.
Claim 4
Dependent Claim
45 words
Radioscopic image former according to CLaim 1, in which the said slit contains a number of movable tongues, characterized in that said cyclic modulations are brought about by exciting each tongue in or near its resonant frequency, each tongue having its own frequency or phase.
Claim 5
Dependent Claim
20 words
Radioscopic image former according to CLaim 3, characterized in that an X-ray or Light detector is situated behind said subject.
Claim 6
Dependent Claim
34 words
Radioscopic image former according to CLaim 4, characterized in that the signal from the said detector, if necessary after frequency transformation, is supplied to a number of frequency-selective elements which control the individual tongues.
Claim 7
Dependent Claim
18 words
Radioscopic image former according to CLaim 5, characterized in that said control consists of deflecting the individual tongues.
Claim 8
Dependent Claim
22 words
Radioscopic image former according to CLaim 5, characterized in that said control consists of modulation of the vibration amplitudes of said tongues.
Claim 9
Dependent Claim
18 words
Radioscopic image former according to CLaim 5, characterized in that said selective elements are the said tongues themselves.
References Cited (Backward Citations)
No citation records indexed.
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