公开(公告)号：US07043114B2

公开(公告)日：2006-05-09

申请号：US10886342

申请日：2004-07-07

申请人： Stefan Popescu

发明人： Stefan Popescu

IPC分类号： G02B6/26 ,  G02B6/32 ,  H04B10/00

CPC分类号： A61B6/56 ,  G02B6/3604 ,  G02B6/4202 ,  G02B6/4214

摘要： The present invention concerns an apparatus for transmission of optical signals between a rotating part and a stationary part of a machine, particularly a computer tomograph, in which an optical transmitter is arranged on a first of the two parts and an optical receiver with an optical detector is arranged on a second of the two parts, via which optical signals emitted by the optical transmitter are received, whereby the optical receiver comprises an optical concentrator with an at least approximately horn-shaped geometry that concentrates incident optical radiation via internal reflection on side surfaces of the concentrator onto a detection area of the detector. The optical concentrator is formed from a material filling the entire inner volume of the concentrator and optically transparent for at least one wavelength with which the transmitter transmits. A signal-to-noise ratio improved relative to that of known apparatuses for data transmission can be achieved with the present apparatus.

摘要翻译： 本发明涉及一种用于在机器的旋转部件和固定部件之间传输光学信号的装置，特别是计算机断层摄影机，其中在两个部件中的第一部分上布置光学发射器，以及具有光学检测器的光学接收器 被布置在两个部分中的第二部分上，通过该第二部分接收由光发射器发射的光信号，由此光接收器包括具有至少近似喇叭形几何形状的光集中器，其通过内反射将入射光辐射集中在侧表面 的集中器到检测器的检测区域。 光聚集器由填充聚光器的整个内部体积的材料形成，并且对于发射器透射的至少一个波长是光学透明的。 相对于用于数据传输的已知装置的信噪比可以用本装置实现。

公开(公告)号：US20050013535A1

公开(公告)日：2005-01-20

申请号：US10886342

申请日：2004-07-07

申请人： Stefan Popescu

发明人： Stefan Popescu

IPC分类号： H04B10/10 ,  A61B6/00 ,  G02B6/02 ,  G02B6/36 ,  G02B6/42 ,  H04B10/105 ,  H04B10/22 ,  G02B6/26 ,  G11B7/00

CPC分类号： A61B6/56 ,  G02B6/3604 ,  G02B6/4202 ,  G02B6/4214

摘要： The present invention concerns an apparatus for transmission of optical signals between a rotating part and a stationary part of a machine, particularly a computer tomograph, in which an optical transmitter is arranged on a first of the two parts and an optical receiver with an optical detector is arranged on a second of the two parts, via which optical signals emitted by the optical transmitter are received, whereby the optical receiver comprises an optical concentrator with an at least approximately horn-shaped geometry that concentrates incident optical radiation via internal reflection on side surfaces of the concentrator onto a detection area of the detector. The optical concentrator is formed from a material filling the entire inner volume of the concentrator and optically transparent for at least one wavelength with which the transmitter transmits. A signal-to-noise ratio improved relative to that of known apparatuses for data transmission can be achieved with the present apparatus.

摘要翻译： 本发明涉及一种用于在机器的旋转部件和固定部件之间传输光学信号的装置，特别是计算机断层摄影机，其中在两个部件中的第一部分上布置光学发射器，以及具有光学检测器的光学接收器 被布置在两个部分中的第二部分上，通过该第二部分接收由光发射器发射的光信号，由此光接收器包括具有至少近似喇叭形几何形状的光集中器，其通过内反射将入射光辐射集中在侧表面 的集中器到检测器的检测区域。 光聚集器由填充聚光器的整个内部体积的材料形成，并且对于发射器透射的至少一个波长是光学透明的。 相对于用于数据传输的已知装置的信噪比可以用本装置实现。

公开(公告)号：US5867555A

公开(公告)日：1999-02-02

申请号：US811338

申请日：1997-03-04

申请人： Stefan Popescu ,  Dietmar Hentschel ,  Karl-Ernst Strauss ,  Heiko Wolf

发明人： Stefan Popescu ,  Dietmar Hentschel ,  Karl-Ernst Strauss ,  Heiko Wolf

IPC分类号： A61B6/03 ,  G01N23/04

CPC分类号： A61B6/542 ,  A61B6/032 ,  G01N23/046 ,  A61B6/027 ,  G01N2223/419 ,  G01N2223/612

摘要： In a method for reducing a radiation dose in an x-ray CT (computed tomography) system, a maximum x-ray attenuation per projection is computed for every projection or for every n.sup.th projection and the measured angular attenuation profile for a last half rotation of the x-ray beam around a subject is stored, an extrapolation method is conducted for computing an extrapolated attenuation profile for a next half rotation based on the measured angular attenuation profile for the last half rotation, and a process is conducted for setting a dose level for the x-ray beam for a next projection, based on the extrapolated attenuation profile. The x-ray beam can be modulated, with characteristics of the beam modulation being set or controlled dependent on the extrapolated attenuation profile.

摘要翻译： 在用于减少X射线CT（计算机断层摄影）系统中的辐射剂量的方法中，针对每个投影或每第n个投影计算每个投影的最大x射线衰减，以及针对每个投影的最后半个旋转的测量的角衰减曲线 存储被摄体周围的X射线束，进行外插法，用于基于所测量的下一半旋转的角衰减曲线计算下一半旋转的外推衰减曲线，并且进行用于设定剂量水平的处理 对于用于下一个投影的X射线束，基于外推衰减曲线。 可以调制x射线束，其特征在于根据外推衰减曲线来设置或控制波束调制。

公开(公告)号：US5822393A

公开(公告)日：1998-10-13

申请号：US831411

申请日：1997-04-01

申请人： Stefan Popescu

发明人： Stefan Popescu

IPC分类号： A61B6/03 ,  H05G1/20

CPC分类号： A61B6/488 ,  A61B6/032 ,  A61B6/542 ,  A61B6/544

摘要： In a method for adaptively modulating the power level of an x-ray tube of a computer tomography (CT) system for reducing an x-ray dose of an x-ray beam radiating through a patient and reaching detector means of said CT system during the acquisition of projections of body slices of the patient, the value of the maximum attenuation level per projection is established out of the patient projection data acquired for the respective projection and stored in a memory. The value of the maximum attenuation level for the next projection is predicted based on at least one of the stored values of the maximum attenuation levels and the respective power level of the x-ray tube for the next projection is established. Finally the respective power level of the x-ray tube for the next projection is accordingly adjusted.

摘要翻译： 在一种用于自适应地调制计算机断层摄影（CT）系统的X射线管的功率水平的方法中，用于减少通过患者辐射的X射线束的X射线剂量，并在所述CT系统的到达检测器装置 获取患者身体切片的投影，每个投影的最大衰减水平的值被建立在针对各个投影获得的患者投影数据中并存储在存储器中。 基于用于下一个投影的最大衰减水平和X射线管的相应功率电平的存储值中的至少一个被建立来预测下一个投影的最大衰减电平的值。 最后，相应地调整用于下一个投影的X射线管的相应功率水平。

公开(公告)号：US09784810B2

公开(公告)日：2017-10-10

申请号：US14087239

申请日：2013-11-22

申请人： Stefan Popescu

发明人： Stefan Popescu

IPC分类号： G01V3/00 ,  G01R33/48

CPC分类号： G01R33/4804

摘要： In a method and apparatus to quickly determine regions of modified temperature in a sample volume by magnetic resonance tomography using a multi-echo sequence, one or more one-dimensional or two-dimensional images of regions of modified temperature are respectively determined.

公开(公告)号：US09480414B2

公开(公告)日：2016-11-01

申请号：US13927401

申请日：2013-06-26

申请人： Stefan Popescu

发明人： Stefan Popescu

IPC分类号： A61B5/055 ,  G01R33/563 ,  A61B8/08 ,  A61B5/02

CPC分类号： A61B5/055 ,  A61B5/02007 ,  A61B8/485 ,  G01R33/56358

摘要： In a methods for elastography in a defined region of an examined person, a radio-frequency pulse is radiated to manipulate a transverse magnetization in the defined region and at least one additional radio-frequency pulse with a spatial selectivity of the amplitude is radiated to generate shear waves in the defined region. A magnetic resonance signal from the defined region is detected and a determination of a value describing the tissue elasticity in the defined region is made based on the magnetic resonance signal.

摘要翻译： 在被检查人员的限定区域中的弹性成像方法中，辐射射频脉冲以操纵限定区域中的横向磁化，并且辐射具有幅度空间选择性的至少一个附加射频脉冲以产生 定义区域内的剪切波。 检测来自限定区域的磁共振信号，并且基于磁共振信号确定描述限定区域中的组织弹性的值。

公开(公告)号：US09476954B2

公开(公告)日：2016-10-25

申请号：US14096301

申请日：2013-12-04

申请人： Stefan Popescu

发明人： Stefan Popescu

IPC分类号： G01V3/00 ,  G01R33/48 ,  G01R33/565 ,  G01R33/561

CPC分类号： G01R33/4824 ,  G01R33/561 ,  G01R33/56545

摘要： In a method, a magnetic resonance system, and a computer-readable storage medium to generate magnetic resonance measurement data of an imaging area of an examination subject, the imaging area being located in a measurement volume of the magnetic resonance system, by operation of the magnetic resonance system, during the acquisition of the magnetic resonance measurement data, at least one additional nonlinear gradient is switched in addition to the gradients for spatial coding, and k-space is read out according to a random pattern, less densely than is required by the Nyquist condition.

摘要翻译： 在一种方法中，磁共振系统和计算机可读存储介质，用于产生检查对象的成像区域的磁共振测量数据，该成像区域位于磁共振系统的测量体积中， 磁共振系统在获取磁共振测量数据期间除了用于空间编码的梯度之外还切换了至少一个附加的非线性梯度，并且根据随机模式读出k空间，其密度低于 奈奎斯特条件。

公开(公告)号：US20160011284A1

公开(公告)日：2016-01-14

申请号：US14792792

申请日：2015-07-07

申请人： Stefan Popescu

发明人： Stefan Popescu

IPC分类号： G01R33/24 ,  G01R33/36 ,  G01R33/385 ,  G01R33/30

CPC分类号： G01R33/56563 ,  G01R33/56572 ,  G01R33/5659 ,  G01R33/58

摘要： The embodiments relate to methods and an apparatus for measuring a magnetic field in a magnetic resonance tomography device with at least one field probe, wherein at least one generated delete signal may be applied to reduce a residual magnetization in the at least one field probe.

摘要翻译： 这些实施例涉及用于利用至少一个场探头来测量磁共振断层摄影装置中的磁场的方法和装置，其中可施加至少一个产生的删除信号以减小至少一个场探头中的剩余磁化强度。

公开(公告)号：US20150208946A1

公开(公告)日：2015-07-30

申请号：US14607896

申请日：2015-01-28

申请人： Stefan Popescu

发明人： Stefan Popescu

IPC分类号： A61B5/055 ,  A61B5/11 ,  A61B6/03

CPC分类号： A61B5/0555 ,  A61B5/0035 ,  A61B5/11 ,  A61B5/113 ,  A61B5/6892 ,  A61B5/721 ,  A61B6/032 ,  A61B6/037 ,  A61B6/0428 ,  A61B6/527 ,  G01R33/28 ,  G01R33/3685 ,  G01R33/4814

摘要： The embodiments relate to a device for positioning an examination object when using an imaging system. The device includes a positioning device for the purpose of positioning the examination object for data capture by the imaging system, and at least one sensor fixed to the positioning device. The at least one sensor is configured to capture a movement of the examination object relative to the positioning device. The device is configured to provide the movement to the imaging system.

摘要翻译： 实施例涉及在使用成像系统时用于定位检查对象的装置。 该装置包括用于定位用于由成像系统进行数据捕获的检查对象的定位装置，以及固定到定位装置的至少一个传感器。 所述至少一个传感器被配置成捕获所述检查对象相对于所述定位装置的运动。 该装置被配置为向成像系统提供移动。

公开(公告)号：US20140073902A1

公开(公告)日：2014-03-13

申请号：US14021088

申请日：2013-09-09

申请人： Stefan Popescu

发明人： Stefan Popescu

IPC分类号： A61B6/00

CPC分类号： A61B6/541 ,  A61B5/02 ,  A61B5/022 ,  A61B5/02422 ,  A61B5/055 ,  A61B5/7285 ,  A61B6/032 ,  A61B6/037 ,  A61B6/504 ,  G16H40/63

摘要： A medical imaging device includes a sensor unit for detecting a physiological signal, and a data evaluation unit which, on the basis of the detected physiological signals, determines a trigger signal for a medical imaging examination on a patient. The sensor unit includes at least one sensor element which is designed for detection of at least one blood circulation signal.

摘要翻译： 医疗成像装置包括用于检测生理信号的传感器单元，以及数据评估单元，其基于检测到的生理信号，确定用于对患者进行医学成像检查的触发信号。 传感器单元包括至少一个被设计用于检测至少一个血液循环信号的传感器元件。