Positron emission computed tomography apparatus and image reconstruction method
US5703369A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 18, 1996 |
| Grant date | Dec 30, 1997 |
| Priority date | — |
| Expiry date | Oct 18, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01T1/2985
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
In a positron emission computed tomography apparatus of the present invention, a calibration radiation source is rotated in a measurement space in a detector ring comprised of a lot of photon detectors to perform blank measurement, and sensitivity data are produced on the basis of photon pair detection frequencies obtained for every photon detector pair of the detector ring. Subsequently, an object is set in the measurement space to perform emission measurement, and detection pair identification signals (I, J) from a coincidence counting circuit are subjected to compensation for body motion of the object measured by a position-direction measuring section and then are converted into polar coordinate values of a detector line. At the same time, cumulative data inversely proportional to corresponding values of sensitivity data are produced on the basis of the detection pair identification signals (I, J). Then this cumulative data is cumulated at an address in an address space corresponding to the coordinate values of the detector line to be accumulated as projection data. Therefore, even with an object moving during measurement, an accurate reconstructed image can be attained by effec…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.