| 摘要 |
<p>A control system for an X-ray scanner, the system comprising an input arranged to receive an input signal identifying which of a plurality of electron emitters is to be active, and to produce a plurality of outputs each arranged to control operation of one of the emitters, wherein each of the outputs can be in a first state arranged to activate its respective emitter, and a second state arranged to de-activate said emitter, the system further comprising blanking means arranged to fix all of the outputs in the second state irrespective of which state the input signal indicates they should nominally be in. The system may be operated in a sequential access mode in which the blanking means is turned off while each of the emitters is activated in turn, or in a non-sequential access mode in which emitters are activated for respective activation periods and the blanking means is turned on between said activation periods.</p> |
