A transconductance cell includes a positive rail for providing a positive power supply voltage and a negative rail for providing a negative power supply voltage. The present invention further relates to a corresponding detector element for a detector, an X-ray imaging device, a method for determining a count result from a detector element, a computer program, a data carrier and a detector for an X-ray imaging device. The system also includes a digital data processor executing said executable program instructions to: i. to give copolymers having molecular weights of from 500 to 20,000 gmol, and said agglomerated polymer particles are used as thickeners for textile pigment print pastes.