公开(公告)号：US20200278461A1

公开(公告)日：2020-09-03

申请号：US16797609

申请日：2020-02-21

Applicant: Hitachi, Ltd.

Inventor： Kazuma YOKOI ,  Isao TAKAHASHI

IPC: G01T7/00 ,  G01T1/16 ,  A61B6/00

Abstract: A radiation imaging device capable of reducing the number of measurement times of calibration data used in pile up correction while maintaining the accuracy of the pile up correction. The radiation imaging device has a photon counting type detector to output an electric signal corresponding to energy of an incident radiation photon. The radiation imaging device includes: an extraction unit that extracts a component by the number of pile ups from a material spectrum, as a photon energy spectrum, obtained by detecting a radioactive ray transmitted through a calibration member, formed by combining plural basal substances having different radiation attenuation coefficients, with the photon counting type detector; and a synthesis unit that generates a calibrated equivalent spectrum, as a photon energy spectrum to be collated with an imaging spectrum obtained by imaging a subject by synthesizing the components by the number of pile ups based on the imaging spectrum.

公开(公告)号：US20180049707A1

公开(公告)日：2018-02-22

申请号：US15560291

申请日：2016-03-18

Applicant: HITACHI, LTD.

Inventor： Takafumi ISHITSU ,  Isao TAKAHASHI ,  Kazuma YOKOI

IPC: A61B6/00 ,  A61B6/03

CPC classification number: A61B6/4241 ,  A61B6/032 ,  A61B6/037 ,  A61B6/4233 ,  A61B6/4258 ,  A61B6/4291 ,  G01T1/17 ,  G01T1/172 ,  G01T1/36

Abstract: To improve performance in Photon Counting CT, pixel miniaturization, a reduction in circuit dead time, and dealing with scattered radiation and charge sharing are important. In addition, because the number of circuits increases, a reduction in power consumption of each circuit is important. Under these constraints, circuitry that deals with the scattered radiation is provided. Each pixel includes a circuit that determines whether radiation has been detected by another, adjacent pixel at the same time, and counters that count the radiation are switched on the basis of the result of the determination. On the basis of this result, counts of non-coincident events are primarily used, and coincident counts are used after being corrected, for reconstruction data.

公开(公告)号：US20160348270A1

公开(公告)日：2016-12-01

申请号：US15116532

申请日：2014-10-08

Applicant: HITACHI, LTD.

Inventor： Takayuki KANDA ,  Shinya KOMINAMI ,  Yuichiro UENO ,  Takafumi ISHITSU ,  Tomoyuki SEINO ,  Isao TAKAHASHI

IPC: C30B13/08 ,  C01G15/00 ,  C30B29/46 ,  C30B13/14 ,  C30B13/16

CPC classification number: C30B13/08 ,  C01G15/00 ,  C30B11/00 ,  C30B11/002 ,  C30B11/007 ,  C30B13/14 ,  C30B13/16 ,  C30B29/12 ,  C30B29/42 ,  C30B29/46 ,  C30B29/48 ,  C30B35/002 ,  C30B35/007

Abstract: A crucible provided with a holding section (12) for holding a raw material (20), an initial distillate recovery section (14) for recovering an initial distillate (24) when the raw material (20) held in the holding section (12) has been vaporized, a main distillate condensing section (16) for condensing a main distillate when the raw material (20) held in the holding section (12) has been vaporized, and a crystal growing section (18) for holding the main distillate (30) comprising a raw material melt (28) condensed by the main distillate condensing section (16) and producing crystals when crystals are grown from the held main distillate (30) is used as a crucible (10) for crystal growth used to grow crystals. This makes it possible to raise the efficiency of manufacturing crystals while achieving high purification of a raw material for semiconductor crystals.

Abstract translation: 一种具有用于容纳原料的保持部（12）的坩埚，当保持在保持部（12）中的原料（20）时，用于回收初馏体（24）的初馏点回收部（14） 被蒸发的主蒸馏冷凝部分（16），用于当保持在保持部分（12）中的原料（20）已经蒸发时冷凝主馏分;以及晶体生长部分（18），用于保持主馏出物 30）包括由主馏出物冷凝部（16）冷凝的原料熔体（28），并且当从保持的主馏出物（30）生长晶体时产生晶体，作为晶体生长用的坩埚（10），用于生长晶体 。 这使得可以提高制造晶体的效率，同时实现半导体晶体的原料的高纯化。