An imaging apparatus comprising: a detection unit including a plurality of pixels arranged in row and column directions, wherein each of the pixels includes a conversion element (S1-1 - S6-6) for converting an incident radiation or an incident light into an electric charge and a switch element (T1-1 - T1-6) for transferring an electric signal corresponding to the electric charge; a drive circuit unit for driving a plurality of the switch elements (T1-1 - T1-6) of the detection unit arranged in the row direction to transfer the electric signals in parallel from the pixels arranged in the row direction; a read out circuit unit for reading out the electric signals of the columns of the detection unit in parallel, wherein the read out circuit unit comprises at least, for each set of columns of the detection unit, a first sampling and holding circuit (Sn1,C1) having a first capacitive element and a first switch for sampling an electric signal from pixels arranged along one column of the detection unit by turning on the first switch and holding the electric signal to the first capacitive element by turning off the first switch, and a second sampling and holding circuit (Sn2,C2) having a second capacitive element and a second switch for sampling an electric signal from pixels arranged along another column of the detection unit by turning on the second switch and holding the electric signal to the second capacitive element by turning off the second switch, wherein the one column and the another column are arranged adjacent to each other, respectively; and a control unit for controlling the read out circuit unit, characterized in that the control unit is adapted to supply at least, for each set of columns of the detection unit, a first sampling and holding signal (SMPL1) to the first sampling and holding circuit (Sn1, C1) and a second sampling and holding signal (SMPL2) to the second sampling and holding circuit (Sn2, C2), wherein the first sampling and holding signal (SMPL1) and the second sampling and holding signal (SMPL2) are configured to control the read out circuit unit such that, for each set of columns of the detection unit, the second switch is ON during an ON period of the first switch, and a timing of turning OFF the first switch is different from a timing of turning OFF the second switch. a detection unit including a plurality of pixels arranged in row and column directions, wherein each of the pixels includes a conversion element (S1-1 - S6-6) for converting an incident radiation or an incident light into an electric charge and a switch element (T1-1 - T1-6) for transferring an electric signal corresponding to the electric charge; a drive circuit unit for driving a plurality of the switch elements (T1-1 - T1-6) of the detection unit arranged in the row direction to transfer the electric signals in parallel from the pixels arranged in the row direction; a read out circuit unit for reading out the electric signals of the columns of the detection unit in parallel, wherein the read out circuit unit comprises at least, for each set of columns of the detection unit, a first sampling and holding circuit (Sn1,C1) having a first capacitive element and a first switch for sampling an electric signal from pixels arranged along one column of the detection unit by turning on the first switch and holding the electric signal to the first capacitive element by turning off the first switch, and a second sampling and holding circuit (Sn2,C2) having a second capacitive element and a second switch for sampling an electric signal from pixels arranged along another column of the detection unit by turning on the second switch and holding the electric signal to the second capacitive element by turning off the second switch, wherein the one column and the another column are arranged adjacent to each other, respectively; and a control unit for controlling the read out circuit unit, characterized in that the control unit is adapted to supply at least, for each set of columns of the detection unit, a first sampling and holding signal (SMPL1) to the first sampling and holding circuit (Sn1, C1) and a second sampling and holding signal (SMPL2) to the second sampling and holding circuit (Sn2, C2), wherein the first sampling and holding signal (SMPL1) and the second sampling and holding signal (SMPL2) are configured to control the read out circuit unit such that, for each set of columns of the detection unit, the second switch is ON during an ON period of the first switch, and a timing of turning OFF the first switch is different from a timing of turning OFF the second switch.