论文信息 - Evaluation of an ultra-fast photon-counting energy-resolved ASIC for spectral CT

Evaluation of an ultra-fast photon-counting energy-resolved ASIC for spectral CT

We have developed an ultra-fast photon-counting energy-resolved application specific integrated circuit (ASIC) for spectral computed tomography (CT). A comprehensive characterization has been carried out to investigate the performance of the ASIC in terms of energy resolution under different photon flux rates and the count rate linearity in photon-counting mode. An energy resolution of 4.7 % has been achieved for 59.5 keV low flux photons. The count rate performance of the ASIC was measured with 120 kVp polychromatic x-rays. The results indicate that the count rate linearity can be kept for a flux rate up to 150 Mphotons s-1 mm-2 with retained energy information, and this value is increased to be 250 Mphotons s-1 mm-2 in photon-counting mode.

[1] Cheng Xu,et al. Performance characterization of a silicon strip detector for spectral computed tomography utilizing a laser testing system , 2011, Medical Imaging.

[2] Cheng Xu,et al. Design considerations to overcome cross talk in a photon counting silicon strip detector for computed tomography , 2010 .

[3] Cheng Xu,et al. A High-Rate Energy-Resolving Photon-Counting ASIC for Spectral Computed Tomography , 2012, IEEE Transactions on Nuclear Science.

[4] Mats Danielsson,et al. Performance evaluation of a sub-millimeter spectrally resolved CT system on pediatric imaging tasks: a simulation , 2011, Medical Imaging.

[5] Cheng Xu,et al. Photon-counting CT with silicon detectors: feasibility for pediatric imaging , 2009, Medical Imaging.

[6] M. Danielsson,et al. Photon-counting spectral computed tomography using silicon strip detectors: a feasibility study , 2010, Physics in medicine and biology.

[7] Erik Fredenberg,et al. Energy resolution of a photon-counting silicon strip detector , 2010, 2101.07789.

[8] B. Schmitt,et al. Performance of single-photon-counting PILATUS detector modules , 2009, Journal of synchrotron radiation.

[9] G. De Geronimo,et al. A CMOS baseline holder (BLH) for readout ASICs , 1999, 1999 IEEE Nuclear Science Symposium. Conference Record. 1999 Nuclear Science Symposium and Medical Imaging Conference (Cat. No.99CH37019).