| 发明名称 | Noise balance pre-reconstruction data decomposition in spectral CT | ||
| 摘要 | 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 and for all views before reconstructing images based upon the non-zero thickness. | ||
| 申请公布号 | US8965095(B2) | 申请公布日期 | 2015.02.24 |
| 申请号 | US201313906110 | 申请日期 | 2013.05.30 |
| 申请人 | Kabushiki Kaisha Toshiba;Toshiba Medical Systems Corporation | 发明人 | Zou Yu;Wang Xiaolan |
| 分类号 | G06K9/00;G06T7/00 | 主分类号 | G06K9/00 |
| 代理机构 | Yoshida & Associates, LLC | 代理人 | Yoshida & Associates, LLC |
| 主权项 | 1. A method of noise balancing in spectral data, comprising: acquiring from a subject spectral data including a first set of photon counts in a first number of at least three acquired spectral bins according to fixed thresholds for a predetermined number of views each having a family of ray-sums; combining the first set of the photon counts in the acquired spectral bins into a second set of photon counts in a second number of two or more processed spectral bins according to a third set of weights that are related to one of basis materials in the subject and one of the acquired spectral bins, the second number also being equal to a number of the basis materials and being smaller than the first number so as to balance noise in the spectral data among the processed spectral bins; relating the photon counts in the processed spectral bins to a material thickness for each of the basis materials; and reconstructing images from the material thickness of each of the basis materials and the processed spectral bins. | ||
| 地址 | Tokyo JP | ||