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PerssonM.et al., “Upper limits of the photon fluence rate on CT detectors: case study on a commercial scanner,” Med. Phys. 43(7), 4398 (2016).MPHYA60094-240510.1118/1.495400827370155PerssonM.et al., “Upper limits of the photon fluence rate on CT detectors: case study on a commercial scanner,” Med. Phys. 43(7), 4398 (2016).MPHYA60094-240510.1118/1.495400827370155, PerssonM.et al., “Upper limits of the photon fluence rate on CT detectors: case study on a commercial scanner,” Med. Phys. 43(7), 4398 (2016).MPHYA60094-240510.1118/1.495400827370155
Jacob Wikner, and Mats Danielsson have financial interests in Prismatic Sensors AB
J. Schlomka, E. Roessl, R. Dorscheid, S. Dill, G. Martens, T. Istel, C. Bäumer, C. Herrmann, R. Steadman, G. Zeitler, Amir Livne, R. Proksa (2008)
Experimental feasibility of multi-energy photon-counting K-edge imaging in pre-clinical computed tomographyPhysics in Medicine & Biology, 53
H. Bornefalk, M. Danielsson (2010)
Photon-counting spectral computed tomography using silicon strip detectors: a feasibility studyPhysics in Medicine & Biology, 55
Abstract.Purpose: Photon-counting silicon strip detectors are attracting interest for use in next-generation CT scanners. For CT detectors in a clinical environment, it is desirable to have a low power consumption. However, decreasing the power consumption leads to higher noise. This is particularly detrimental for silicon detectors, which require a low noise floor to obtain a good dose efficiency. The increase in noise can be mitigated using a longer shaping time in the readout electronics. This also results in longer pulses, which requires an increased deadtime, thereby degrading the count-rate performance. However, as the photon flux varies greatly during a typical CT scan, not all projection lines require a high count-rate capability. We propose adjusting the shaping time to counteract the increased noise that results from decreasing the power consumption.Approach: To show the potential of increasing the shaping time to decrease the noise level, synchrotron measurements were performed using a detector prototype with two shaping time settings. From the measurements, a simulation model was developed and used to predict the performance of a future channel design.Results: Based on the synchrotron measurements, we show that increasing the shaping time from 28.1 to 39.4 ns decreases the noise and increases the signal-to-noise ratio with 6.5% at low count rates. With the developed simulation model, we predict that a 50% decrease in power can be attained in a proposed future detector design by increasing the shaping time with a factor of 1.875.Conclusion: Our results show that the shaping time can be an important tool to adapt the pulse length and noise level to the photon flux and thereby optimize the dose efficiency of photon-counting silicon detectors.
Journal of Medical Imaging – SPIE
Published: Sep 1, 2020
Keywords: silicon photon-counting detector; dose efficiency; photon-counting detector; shaping time; application-specific integrated circuit
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