公开(公告)号：US09633814B2

公开(公告)日：2017-04-25

申请号：US14288753

申请日：2014-05-28

Applicant: TOSHIBA MEDICAL SYSTEMS CORPORATION

Inventor： Daizo Oikawa ,  Fumio Ishiyama

IPC: H01J35/02 ,  H01J37/24 ,  H05G1/32 ,  H05G1/46 ,  G05F1/10 ,  G05F1/56 ,  G05F1/565 ,  H01J37/302 ,  H01J37/248 ,  A61B6/00 ,  A61B6/03

CPC classification number: H01J35/025 ,  A61B6/032 ,  A61B6/405 ,  A61B6/4241 ,  A61B6/54 ,  A61B6/542 ,  A61B6/58 ,  G05F1/10 ,  G05F1/565 ,  H01J37/241 ,  H01J37/248 ,  H01J37/3023 ,  H01J2237/2487 ,  H05G1/32 ,  H05G1/46

Abstract: X-ray CT apparatus is provided in which the photon energy distribution of X-rays to be radiated is flattened. X-ray CT apparatus includes an X-ray tube, a detector, a data acquisition system, a tube voltage generator, and a grid controller. The X-ray tube radiates X-rays onto a subject. The detector includes multiple detection elements for detecting photons forming the X-rays. The data acquisition system counts the number of the detected photons to acquire projection data based on the counted photons. The tube voltage generator applies the tube voltage to the X-ray tube while changing the tube voltage of the X-ray tube in a predetermined cycle. A tube current controller decreases the tube current upon an increase in the tube voltage, and increases the tube current upon a decrease in the tube voltage. Thus, the photon energy distribution of the X-rays radiated from the X-ray tube is flattened.

公开(公告)号：US10182775B2

公开(公告)日：2019-01-22

申请号：US14873710

申请日：2015-10-02

Applicant: Toshiba Medical Systems Corporation

Inventor： Hiroaki Nakai ,  Daizo Oikawa

IPC: A61B6/03 ,  A61B6/00 ,  A61B6/06 ,  A61B6/04

Abstract: An X-ray computed tomography apparatus according to an embodiment stores a plurality of reference count data indicative of energy spectra of X-rays, which are associated with a plurality of tube voltages or tube currents. Estimation circuitry estimates a tube voltage or a tube current at a time of X-ray irradiation, based on a comparison of energy spectra between second count data and each of the plurality of reference count data. Correction circuitry corrects first count data acquired together with the second count data, by using an energy spectrum calculated based on the estimated tube voltage or tube current. Reconstruction circuitry reconstructs medical image data, based on the corrected first count data.

公开(公告)号：US09595101B2

公开(公告)日：2017-03-14

申请号：US14744645

申请日：2015-06-19

Applicant: Toshiba Medical Systems Corporation

Inventor： Tooru Kato ,  Daizo Oikawa ,  Hiroaki Nakai

IPC: G06T7/00 ,  A61B6/03 ,  A61B6/00 ,  G06T11/00 ,  G06K9/46 ,  G06T5/00

CPC classification number: G06T7/0012 ,  A61B6/032 ,  A61B6/4241 ,  A61B6/482 ,  A61B6/5205 ,  G06K9/46 ,  G06K2009/4666 ,  G06T5/001 ,  G06T11/005 ,  G06T2207/10081 ,  G06T2207/10116 ,  G06T2211/408

Abstract: An X-ray CT apparatus according to an embodiment includes acquiring circuitry and processing circuitry. The acquiring circuitry is configured to count photons derived from X-rays that have passed through a subject and to acquire a result obtained by discriminating energy levels of the counted photons as a counting result. The processing circuitry is configured to notify the acquiring circuitry of an energy dividing set that is set in accordance with an X-ray absorption characteristic of a substance designated by an operator, to receive the counting result acquired by the acquiring circuitry by allocating a counted value to each of a plurality of energy discrimination regions that are set in the energy dividing set, and to reconstruct image data by using the received counting result.

Abstract translation: 根据实施例的X射线CT装置包括采集电路和处理电路。 获取电路被配置为对已经通过被摄体的X射线衍生的光子进行计数，并且获得通过将计数的光子的能级判别为计数结果而获得的结果。 所述处理电路被配置为向所述获取电路通知根据由操作者指定的物质的X射线吸收特性设置的能量分配集，以通过分配计数值来接收由所述获取电路获取的计数结果 分配给能量分割集中的多个能量鉴别区域中的每一个，并且通过使用所接收的计数结果来重构图像数据。