A detector readout circuit, comprising: a charge-sensitive amplifier, comprising: an amplifier configured to receive an input signal from a radiation detector and to output an amplified signal; a reset switch configured to receive a reset signal; and a capacitor in electrical connection with the reset switch and amplifier; a shaping amplifier configured to receive the amplified signal and perform a shaping operation on the amplified signal to generate a shaped signal, wherein the shaping operation has a shaping time on the order of 50 ns or less; energy readout and control circuitry configured to receive the shaped signal from the shaping amplifier, the circuitry comprising: an integrator configured to receive the shaped signal and to integrate the shaped signal over time to generate an integrated signal; a comparator configured to receive the integrated signal and determine a true detection event such that the integrated signal is greater than a preset threshold, and a peak analog-to-digital converter configured to receive inputs signals from the comparator and the shaping amplifier and to output energy information of a detected true event; a delay circuit configured to receive an output from the comparator and to generate a delay signal to operate the reset switch of the charge-sensitive amplifier. a charge-sensitive amplifier, comprising: an amplifier configured to receive an input signal from a radiation detector and to output an amplified signal; a reset switch configured to receive a reset signal; and a capacitor in electrical connection with the reset switch and amplifier; an amplifier configured to receive an input signal from a radiation detector and to output an amplified signal; a reset switch configured to receive a reset signal; and a capacitor in electrical connection with the reset switch and amplifier; a shaping amplifier configured to receive the amplified signal and perform a shaping operation on the amplified signal to generate a shaped signal, wherein the shaping operation has a shaping time on the order of 50 ns or less; energy readout and control circuitry configured to receive the shaped signal from the shaping amplifier, the circuitry comprising: an integrator configured to receive the shaped signal and to integrate the shaped signal over time to generate an integrated signal; a comparator configured to receive the integrated signal and determine a true detection event such that the integrated signal is greater than a preset threshold, and a peak analog-to-digital converter configured to receive inputs signals from the comparator and the shaping amplifier and to output energy information of a detected true event; an integrator configured to receive the shaped signal and to integrate the shaped signal over time to generate an integrated signal; a comparator configured to receive the integrated signal and determine a true detection event such that the integrated signal is greater than a preset threshold, and a peak analog-to-digital converter configured to receive inputs signals from the comparator and the shaping amplifier and to output energy information of a detected true event; a delay circuit configured to receive an output from the comparator and to generate a delay signal to operate the reset switch of the charge-sensitive amplifier.