The authors report a carbon nanotube ͑CNT͒ field emission multipixel x-ray array source for microradiotherapy for cancer research. The developed multipixel x-ray array source has 50 individually controllable pixels and it has several distinct advantages over other irradiation source including high-temporal resolution ͑millisecond level͒, the ability to electronically shape the form, and intensity distribution of the radiation fields. The x-ray array was generated by a CNT cathode array ͑5 ϫ 10͒ chip with electron field emission. A dose rate on the order of Ͼ1.2 Gy/ min per x-ray pixel beam is achieved at the center of the irradiated volume. The measured dose rate is in good agreement with the Monte Carlo simulation result.

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