| http://www.w3.org/ns/prov#value | - Transmitting regions 98 may be apertures, for example, or rods or hollow tubes of a material, such as plastic, that attenuates the x-rays substantially less than the surrounding attenuating material. [0041] Advantages of preferred embodiments of the present invention include electromagnetic control of the region over which the particles scan the target and, consequently, control of the region over
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