We investigated technical and theoretical aspects of a photodiode TIA (Trans Impedance Amplifier) circuit in order to design a low-cost multi-channel dosimeter for diagnostic radiology. The detectors are Hamamatsu s2506-02/04 (PIN) and Silonex SLSD 71N100 (PN) silicon photodiodes. These showed good sensitivity and a fairly low angular dependence towards incident x-ray radiation at the typical energies used in CT [1][2]. To minimize the angular sensitivity of the sensors several photodiodes can be used in parallel. Selecting the electrical components required a bandwidth and noise analysis in order to stabilize the circuit and increase the SNR (Signal to Noise Ratio). These devices are promising as low cost, real time systems for dose measurements inside dedicated CT phantoms.
Characterization and development of a low cost system to evaluate beam quality in diagnostic radiology
CIOLINI, RICCARDO;D'ERRICO, FRANCESCO
2015-01-01
Abstract
We investigated technical and theoretical aspects of a photodiode TIA (Trans Impedance Amplifier) circuit in order to design a low-cost multi-channel dosimeter for diagnostic radiology. The detectors are Hamamatsu s2506-02/04 (PIN) and Silonex SLSD 71N100 (PN) silicon photodiodes. These showed good sensitivity and a fairly low angular dependence towards incident x-ray radiation at the typical energies used in CT [1][2]. To minimize the angular sensitivity of the sensors several photodiodes can be used in parallel. Selecting the electrical components required a bandwidth and noise analysis in order to stabilize the circuit and increase the SNR (Signal to Noise Ratio). These devices are promising as low cost, real time systems for dose measurements inside dedicated CT phantoms.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
