Hitachi, Ltd.

Kana Tanaka

Koichi Hirokawa

Yukio Kumagai

Ryo Yoshida

In order to provide an X-ray CT apparatus and the like capable of obtaining an optimal X-ray dose for a dynamically changing X-ray irradiation region and reliably irradiating the X-ray irradiation region in a case where X-rays are applied with a spreading angle in a body axis direction, an X-ray CT apparatusdynamically changes an X-ray irradiation regionfor each view angle during scanning, and a system control devicechanges a position of an analysis lineused to calculate an optimal tube current during scanning according to a position of the X-ray irradiation regionat each view angle, so as to obtain an optimal irradiation X-ray dose.

X-ray CT apparatus and scanning method

In an X-ray CT apparatus, a tube current value calculation unit calculates a tube current value of an X-ray tube based on a successive approximation process condition and based on an input scanning condition and/or a reconstruction condition. A scanning control unit performs scanning based on the calculated tube current value of the X-ray tub, and an image reconstruction unit reconstructs a tomographic image of an object, in accordance with the selected successive approximation process condition and the reconstruction condition. The tomographic image is reconstructed from an amount of transmitted X-rays detected by an X-ray detector after being emitted from an X-ray source to the object, in accordance with the calculated tube current value of the X-ray tube, and being transmitted through the object.

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Tokyo, Japan

Kana Tanaka