Systems and methods for scanning objects

A scanner system comprising:

• a radiation generator arranged to generate radiation to irradiate an object, having a velocity, wherein the radiation generator comprises an adjustable collimator and wherein the object comprises areas of a first attenuation level and areas of a second attenuation level, said first attenuation level being higher than said second attenuation level;
• a detector structure arranged to detect the radiation after it has interacted with the object and generate a sequence of detector data sets as the object is moved relative to the generator;
• and
• a processor arranged to obtain and process each of the detector data sets thereby to generate a control output arranged to adjust the collimator and subsequently vary the radiation from the radiation generator as the object is scanned, wherein the processor is arranged to modulate a rate at which the data sets are obtained such that said rate varies with the velocity of the object and wherein the control output is arranged to adjust the collimator and subsequently vary said radiation such that said radiation comprises a first dose rate and a second dose rate, said first dose rate being higher than said second dose rate, and such that radiation of said first dose rate is directed toward the areas of the first attenuation level and radiation of said second dose rate is directed toward the areas of the second attenuation level.