Ge Medical Systems Global Technology Company, LLC

Tokyo Shibaura Electric Co., Ltd.

Mitsuru Yahata

Masaya Kumazaki

Akira Hagiwara

Akihiko Nishide

Makoto Gohno

Yasuhiro Imai

Haruo Kurochi

Akira Izuhara

Masashi Maida

Kentaro Ogata

Takuji Sawaya

Kazumitu Kawamura

A CT image reconstruction method includes substituting other projection data, which has a predetermined positional relationship to projection data that is found defective during scanning, for the defective data, and interpolating back projection data using a value and information on a scanned position that are contained in the substitute data.

CT image reconstruction method, CT apparatus, and program

The present invention provides a detector which suppress the crosstalk between detector cells while improving the acquisition efficiency of X-ray radiation. The detector includes a plurality of detector cells, arranged along a detection plane of X-ray, in which each detector cell has a scintillator unit made of a scintillator, and a photodiode for transduce the light incoming from the scintillator unit into electric signals. The scintillator units are partitioned each from another by the border, which has a groove extending in the channel and row directions. A scintillator is provided in some part of the border in the incident X-ray direction.

X-ray radiation detector, X-ray imaging apparatus, X-ray CT apparatus and method of manufacturing X-ray detector

With the object of realizing an X-ray CT apparatus which performs a plurality of pieces of imaging small in resolution degradation too simultaneously while suppressing an expansion of a data acquisition section that receives an electric signal of an X-ray detector, such an array that X-ray detectors in a channel direction are operated with the two as one pair is made by first detector switching means of a switching unit. This array moved by one X-ray detector in the channel direction is alternately repeated in the row or channel direction. Therefore, even when the number of receivers is small, data extending over a wide imaging range can simultaneously be collected while the degradation of resolution is being suppressed to a minor degree. By extension, imaging more coincident with an operator-aimed image can be done by making the switching use of imaging in high resolution.

X-ray CT apparatus

An X-ray CT system comprises: an X-ray generator that generates two cone beam X-radiations which pass through two successive slabs; an X-ray detector that detects a two-dimensional distribution of intensities exhibited by the two cone beam X-radiations having passed through the two slabs; an acquisition unit that acquires a plurality of view of projection data representing the two slabs on the basis of detection signals sent from the X-ray detector; and a reconstruction unit that reconstructs an image according to the projection data.

X-ray CT system and X-ray apparatus

An X-ray distribution adjusting filter apparatus for supplying a desired X-ray intensity distribution or adjusting the X-ray distribution to a desired profile, the bowtie filter as the X-ray distribution adjusting filter apparatus has a fixed section having a base portion and inclined portions, first and second movable sections configured to be tiltable pivoting on a center point, and first and second deformable sections whose cavities defined by the fixed section, the movable sections and an expansible bellows is to be filled with fluid, wherein the inclined faces of the fixed section and the flat faces of the movable sections are caused to approach or move away from each other by the tilting of the movable sections pivoting on the center point to vary the quantity of the fluid in the cavities of the movable sections, and to vary the sectional shape of the X-ray absorbing portion of the bowtie filter.

X-ray distribution adjusting filter apparatus and X-ray CT apparatus using the same

A capacitor connected between the anode and cathode of an X-ray tube through an X-ray switch is charged by a DC output voltage including ripple component from a rectifier connected to the secondary of a high-tension transformer. The primary of the high-tension transformer is connected to a switching circuit. A switching control circuit produces a turn-on signal for the switching circuit when a pulse signal derived from a phase detector in synchronism with a given phase of the ripple component, an X-ray exposure instruction signal and a charge instruction signal formed in a comparator are logically processed, and a turn-off signal when the charge voltage of the capacitor reaches a given value. The switching circuit is ON-OFF controlled by the switching control circuit.

Growing community of inventors

Tokyo, Japan

Mitsuru Yahata