Transmission line source assembly for spect cameras
US5479021A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 19, 1993 |
| Grant date | Dec 26, 1995 |
| Priority date | — |
| Expiry date | Nov 19, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2211/432
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A rotatable gantry portion (16) is rotatably mounted on the stationary gantry portion (18) of a SPECT camera. A plurality of radiation detector heads (10a, 10b, 10c) are mounted to the rotating gantry. A transmission radiation source holder and collimator assembly (40, 42) is mounted to the rotatable gantry portion opposite one of the detector heads. A transmission radiation source (60) is mounted in a lead shield (62) with an opening (64) pointing toward an examination region (12). A shutter (66) is rotatable between a closed position in which a lead arc segment (70) blocks the opening (64), a calibration orientation in which tin (72) covers opening (64), and an open position in which an opening (74) is aligned with the opening (64). A safety interlock means (80) locks the shutter in the closed position and against rotation when the radiation source holder is removed from the rotatable gantry portion. A collimator (42) has lead side walls (200) and tin or tin alloy septa (202). When radiation from the radiation source strikes the lead side walls, they emit characteristic lead x-rays of about 88 keV whereas the tin radiates x-rays of only about 30 keV. A filter (210) includes an in…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.