Fixed septum collimator for electron beam tomography
US5442673A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 30, 1994 |
| Grant date | Aug 15, 1995 |
| Priority date | — |
| Expiry date | Mar 30, 2014 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B6/032
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An x-ray collimator is described which is useful in an electron beam (EB) computed tomography (CT) scanner of the type in which a rotating electron beam is directed to impinge upon a ring-shaped target and the x-rays generated in response thereto are directed to a ring shaped detector array spaced therefrom. The collimator consists of an x-ray blocking septum having an aperture therein, the septum being located in a fixed position substantially co-planer with the planes of the target and the detector, so as to block all x-rays directed from said target to said detector except those which pass through said aperture. Tomographic slice width is determined by the "view" from the spot where the electron beam impinges upon the target, through the aperture, to the detector, and is variable by adjusting the position where the electron beam impinges upon the width of the x-ray target, and in a preferred embodiment, the position of a movable ring. In the preferred embodiment, a movable ring is provide which has a longitudinal axis positioned coaxial with the axis of the aperture and an end face opposed to and parallel with the septum. As well as forming part of the collimator, this ring acts…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.