Radiographic imaging based on detection of ionizing particles

A method of radiographic imaging based on detection of ionizing particles that have traversed an object to be imaged, wherein use is made of:

• an ionizing particle detector comprising:
• an ionization chamber adapted to produce a local ionization in an ionizable medium within the ionization chamber in response to an ionizing particle traversing the ionization chamber;
• a matrix of detection pads being a two-dimensional array in which the detection pads are comprised in a plane and arranged in rows and columns, the matrix of detection pads facing the ionization chamber so that respective detection pads cover respective zones in the ionization chamber;
• a plurality of detection channels wherein respective detection channels comprise respective mutually exclusive groups of detection pads that are electrically interconnected with each other according to the following rules:
• the detection pads of a detection channel are nonadjacent and dispersed throughout the matrix;
• two detection channels have a maximum of two detection pads next to each other, one of the two detection pads belonging to one of the two detection channels, the other of the two detection pads belonging to the other of the two detection channels,
• a detection channel being adapted to provide an indication of a local ionization occurring somewhere within the respective zones in the ionization chamber covered by the respective detection pads of the detection channel,
• the method comprising:
• identifying a cluster of detection pads among the detection pads belonging to detection channels simultaneously providing indications of local ionization;
• and
• providing a traversing point indication on the basis of the cluster that has been identified if the cluster comprises a predefined minimum number of detection pads, the traversing point indication indicating where the ionizing particle has traversed the ionization chamber.