Increasing the dose efficiency in silicon photon-counting detectors utilizing dual shapers

Silicon photon-counting spectral detectors are promising candidates as the next generation detectors for medical CT. For silicon detectors, a low noise floor is necessary to obtain good detection efficiency. A low noise floor can be obtained by having a slow shaping filter in the ASIC, but this leads to a long dead-time, thus decreasing the count-rate performance. In this work, we evaluate the benefit of utilizing two sub-channels with different shaping times. It is shown by simulation that utilizing a dual shaper can increase the dose efficiency for equal count-rate capability by up to 17%.

[1]  S. G. Basiladze,et al.  Application specific integrated circuits in radiation measuring systems (Review, Part 2) , 2016, Instruments and Experimental Techniques.

[2]  Cheng Xu,et al.  Energy resolution of a segmented silicon strip detector for photon-counting spectral CT , 2013 .

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

[4]  J. Sempau,et al.  PENELOPE-2006: A Code System for Monte Carlo Simulation of Electron and Photon Transport , 2009 .

[5]  C Lartizien,et al.  GATE: a simulation toolkit for PET and SPECT. , 2004, Physics in medicine and biology.

[6]  M. Danielsson,et al.  Count statistics of nonparalyzable photon‐counting detectors with nonzero pulse length , 2018, Medical physics.

[7]  Cheng Xu,et al.  Spectral response model for a multibin photon-counting spectral computed tomography detector and its applications , 2016, Journal of medical imaging.

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

[9]  Robert Szczygiel,et al.  N-XYTER, a CMOS read-out ASIC for high resolution time and amplitude measurements on high rate multi-channel counting mode neutron detectors , 2006 .

[10]  C. Svensson,et al.  Evaluation of a Second-Generation Ultra-Fast Energy-Resolved ASIC for Photon-Counting Spectral CT , 2013, IEEE Transactions on Nuclear Science.

[11]  Ben Huber,et al.  Energy-resolved CT imaging with a photon-counting silicon-strip detector , 2014, Medical Imaging.

[12]  C. Svensson,et al.  Preliminary evaluation of a silicon strip detector for photon-counting spectral CT , 2012 .

[13]  F. Scholze,et al.  Mean energy required to produce an electron-hole pair in silicon for photons of energies between 50 and 1500 eV , 1998 .

[14]  Dirk Meier,et al.  A readout ASIC for SPECT , 2005 .