TY - GEN
T1 - Scintillator-specific optimization of 2-bit sigma-delta modulation A/D for gamma-ray pulse waveform capture
AU - Ruiz-Gonzalez, Maria
AU - Furenlid, Lars R.
N1 - Funding Information:
This work was supported in part by NIH/NIBIB under grants P41-EB002035 and R01-EB022521. The work of M. Ruiz-Gonzalez was supported in part by the Mexican National Council of Science and Technology (CONACYT).
Publisher Copyright:
© 2018 SPIE.
PY - 2018
Y1 - 2018
N2 - Scintillator-based gamma-ray detectors convert gamma-ray photons into a burst of scintillation photons, and then into a pulse-shaped electrical signal. By digitizing the pulse waveform, analyses that require information about the shape of the pulse can be performed, such as pulse-shape discrimination, pile-up detection and maximum-likelihood event-parameter estimation of position, energy and time. We have developed an analog-to-digital conversion (ADC) method that hugely reduces the complexity of the data-acquisition (DAQ) system while retaining pulse-shape information, and increases the amount of information that can be extracted from detected gamma rays compared to analog methods. The new DAQ system is based on a modified 2-bit sigma-delta modulator (SDM), in which the possible outputs (00, 01, 10 and 11) are decoded in such a way that they don't necessarily maintain a linear relationship between them. This makes it possible to optimize the SDM algorithm for different characteristic pulse shapes in order to extract as much information as possible. The optimization method that we present in this work is scintillation-crystal specific, but the use of the ADC method is not limited to gamma-ray detection.
AB - Scintillator-based gamma-ray detectors convert gamma-ray photons into a burst of scintillation photons, and then into a pulse-shaped electrical signal. By digitizing the pulse waveform, analyses that require information about the shape of the pulse can be performed, such as pulse-shape discrimination, pile-up detection and maximum-likelihood event-parameter estimation of position, energy and time. We have developed an analog-to-digital conversion (ADC) method that hugely reduces the complexity of the data-acquisition (DAQ) system while retaining pulse-shape information, and increases the amount of information that can be extracted from detected gamma rays compared to analog methods. The new DAQ system is based on a modified 2-bit sigma-delta modulator (SDM), in which the possible outputs (00, 01, 10 and 11) are decoded in such a way that they don't necessarily maintain a linear relationship between them. This makes it possible to optimize the SDM algorithm for different characteristic pulse shapes in order to extract as much information as possible. The optimization method that we present in this work is scintillation-crystal specific, but the use of the ADC method is not limited to gamma-ray detection.
KW - Analog-to-digital conversion
KW - Pulse waveform
KW - Scintillation crystal
KW - Sigma-delta modulation
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U2 - 10.1117/12.2326393
DO - 10.1117/12.2326393
M3 - Conference contribution
AN - SCOPUS:85057380529
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Radiation Detectors in Medicine, Industry, and National Security XIX
A2 - Barber, H. Bradford
A2 - Furenlid, Lars R.
A2 - Grim, Gary P.
PB - SPIE
T2 - Radiation Detectors in Medicine, Industry, and National Security XIX 2018
Y2 - 22 August 2018 through 23 August 2018
ER -