Radiography apparatus
US4464777A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 16, 1981 |
| Grant date | Aug 7, 1984 |
| Priority date | — |
| Expiry date | Oct 16, 2001 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B6/589
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
Disclosed is a radiography apparatus comprising an X-ray tube for radiating X-ray beam in a fan shape, a detector for detecting the X-ray beam coming through a living body at a plurality of angular components of the X-ray beam, and a sampling circuit for sampling an output signal of the detector when the living body moves at a given speed in a direction orthogonal to the plane of the X-ray beam, whereby a radiogram is formed by using the output signal of the sampling circuit. In the radiography apparatus, the distance between the living body and the X-ray tube is variable and is detected by a potentiometer interlocked with the movement of the living body. A pulse signal at a frequency corresponding to an output level of the potentiometer is produced by a pulse frequency modulation circuit, and is supplied as a timing signal to the sampling circuit. Thus, a sampling frequency of the sampling circuit is determined by the distance between the X-ray tube 10 and the living body, so that a radiogram with the same enlargement factor in the X and Y directions is obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.