We demonstrate a contrast improvement of nearly a factor of 5 in a pha
ntom medical x-ray image, using time-gated detection. This improvement
is accomplished by temporal discrimination against scattered x-ray fl
ux and may permit a significant reduction in patient x-ray exposure. A
multiterawatt ultrashort-pulse laser-produced-plasma x-ray source (<1
ps) and a time-gated microchannel plate detector (similar to 100 ps)
are used.