Calibration phantom for computer tomography system
US4985906A · kind A · utility
Inventor
Key dates
| Filing date | Oct 2, 1989 |
| Grant date | Jan 15, 1991 |
| Priority date | — |
| Expiry date | Oct 2, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N23/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A calibration phantom for the quantitative computer tomography (QCT) system for bone or other tissue measurement in which a series of graduated reference solutions are retained within cavities formed in a translucent member having x-ray attenuation characteristics closely approximate to human tissue. In preferred embodiment, the reference solutions are sealed under pressure in direct contact with the material forming the base of the phantom. Only a very thin wall separates the solution from the upper and lower surfaces of the phantom. In addition, the cavities are closely adjacent one another. As a result, phantoms constructed in accordance with this invention minimize the size and mass of the phantom and thus minimize x-ray beam hardening, scatter and image are the facts.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.