Noise balance pre-reconstruction data decomposition in spectral CT
US8965095B2 · kind B2 · utility
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Key dates
| Filing date | May 30, 2013 |
| Grant date | Feb 24, 2015 |
| Priority date | — |
| Expiry date | Aug 22, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2211/408
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
More than two acquired energy or spectral M bins are used for photon counting detectors in a CT system. In the pre-reconstruction data decomposition, the measured photo counts in the M acquired spectral bines are combined into a predetermined fewer number of processed or weighted spectral bines N, which is at least two in number and represents a number of selected basic materials. Since the N basis materials are selected in the imaged subject where N<M, the noise is balanced in the pre-reconstruction data decomposition. In some more detail, after the photon counts n(E) is acquired in each of the M spectral bins as indicated by E=1 to M at each of the detector units for every view, the M acquired spectral bins is combined into the N processed spectral bins so that the photon counts in the N processed spectral bins are substantially balanced to have a least number of differences among the N processed spectral bins. Subsequently, the substantially balanced photon counts in each of the processed spectral bins are related to the material thickness L(i), where i=1 to M. Using a coordinate pursuit technique, the non-zero L(i) is found. The above is repeated for each of the detector units …
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