Abstract: There are a medical image processing apparatus and a medical image processing method that are capable of maintaining the estimation accuracy of noise intensity even though a system noise ratio rises. A medical image processing apparatus includes a difference image generating unit that divides projection data obtained by applying radiation to an examinee to create a difference image between tomographic images reconstructed for every divided piece of projection data; a local variance computing unit that computes local variance in the difference image; and a noise estimation unit that corrects the local variance using a correction function found in advance to estimate noise intensity of a tomographic image of the examinee. The correction function includes system noise.

Abstract: 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 apparatus 1 dynamically changes an X-ray irradiation region 201 for each view angle during scanning, and a system control device 124 changes a position of an analysis line 300 used to calculate an optimal tube current during scanning according to a position of the X-ray irradiation region 201 at each view angle, so as to obtain an optimal irradiation X-ray dose.

Abstract: 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.

Abstract: 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 apparatus 1 dynamically changes an X-ray irradiation region 201 for each view angle during scanning, and a system control device 124 changes a position of an analysis line 300 used to calculate an optimal tube current during scanning according to a position of the X-ray irradiation region 201 at each view angle, so as to obtain an optimal irradiation X-ray dose.

Abstract: In order to provide an X-ray CT apparatus with little image quality degradation even though a tube current value of the X-ray tube is suppressed, an X-ray CT apparatus of the present invention includes: a system controller that calculates a tube current value of an X-ray tube based on a successive approximation process condition selected from a plurality of successive approximation process conditions and input a scanning condition and/or a reconstruction condition and that performs scanning based on the calculated tube current value of the X-ray tube; and an image reconstruction device that reconstructs a tomographic image of an object, based on the selected successive approximation process condition and the reconstruction condition, from an amount of transmitted X-rays detected by an X-ray detector after being emitted from an X-ray source to the object based on the calculated tube current value of the X-ray tube and being transmitted through the object.