公开(公告)号：US06173039B2

公开(公告)日：2001-01-09

申请号：US09140108

申请日：1998-08-25

Applicant: Willi W. Hampel ,  Russell W. Hum ,  Carmine F. Vara, Jr. ,  Steven J. Woloschek

Inventor： Willi W. Hampel ,  Russell W. Hum ,  Carmine F. Vara, Jr. ,  Steven J. Woloschek

IPC: A61B603

CPC classification number: A61B6/5205 ,  A61B6/032 ,  A61B6/06 ,  A61B6/4021 ,  A61B6/4085 ,  A61B6/542

Abstract: Methods and apparatus for dose reduction in a computed tomography (CT) system are described. In one embodiment, the CT system includes a pre-patient collimator and a configurable multislice detector array. The pre-patient collimator includes a plurality of eccentric cams and a filtration device for altering the x-ray beam radiated from a x-ray source. The eccentric cams are positioned to collimate the x-ray beam and may be independently positioned to provide z-axis correction of the x-ray beam. The filtration device includes a plurality of filters for altering the x-ray beam. In operation, an operator selects the type of test and the quantity and thickness of the slices. After altering the detector and collimator configuration, slice data for each slice is gathered.

Abstract translation: 描述了计算机断层摄影（CT）系统中剂量减少的方法和装置。 在一个实施例中，CT系统包括患者前准直仪和可配置多层检测器阵列。 患者前准直仪包括多个偏心凸轮和用于改变从x射线源辐射的X射线束的过滤装置。 偏心凸轮被定位成准直x射线束，并且可以独立地定位以提供x射线束的z轴校正。 过滤装置包括用于改变X射线束的多个过滤器。 在操作中，操作者选择测试的类型以及切片的数量和厚度。 在更改检测器和准直器配置后，收集每个切片的切片数据。

公开(公告)号：US5175754A

公开(公告)日：1992-12-29

申请号：US880833

申请日：1992-05-11

Applicant: Colin J. Casey ,  Russell W. Hum ,  Phil E. Pearson ,  Judith A. Clifford ,  Harold Dalman

Inventor： Colin J. Casey ,  Russell W. Hum ,  Phil E. Pearson ,  Judith A. Clifford ,  Harold Dalman

IPC: A61B6/00 ,  A61B6/03 ,  H05G1/26

CPC classification number: A61B6/4476 ,  A61B6/035 ,  H05G1/26

Abstract: A CT apparatus produces a trigger position signal having a programmable angular spacing, for triggering the acquisition of projections, from an encoder index pulse having a different fixed angular spacing. An estimation circuit estimates the time of occurrence of a next pulse in the trigger position signal by evaluating the timing of the encoder index pulses. The estimation circuit may be a phase-locked-loop or a set of lookup tables keyed to gantry position and speed.

公开(公告)号：US06298117B1

公开(公告)日：2001-10-02

申请号：US09693367

申请日：2000-10-20

Applicant: Willi W. Hampel ,  Russell W. Hum ,  Carmine F. Vara, Jr. ,  Steven J. Woloschek

Inventor： Willi W. Hampel ,  Russell W. Hum ,  Carmine F. Vara, Jr. ,  Steven J. Woloschek

IPC: A61B603

CPC classification number: A61B6/5205 ,  A61B6/032 ,  A61B6/06 ,  A61B6/4021 ,  A61B6/4085 ,  A61B6/542

Abstract: Methods and apparatus for dose reduction in a computed tomography (CT) system are described. In one embodiment, the CT system includes a pre-patient collimator and a configurable multislice detector array. The pre-patient collimator includes a plurality of eccentric cams and a filtration device for altering the x-ray beam radiated from a x-ray source. The eccentric cams are positioned to collimate the x-ray beam and may be independently positioned to provide z-axis correction of the x-ray beam. The filtration device includes a plurality of filters for altering the x-ray beam. In operation, an operator selects the type of test and the quantity and thickness of the slices. After altering the detector and collimator configuration, slice data for each slice is gathered.

Abstract translation: 描述了计算机断层摄影（CT）系统中剂量减少的方法和装置。 在一个实施例中，CT系统包括患者前准直仪和可配置多层检测器阵列。 患者前准直仪包括多个偏心凸轮和用于改变从X射线源辐射的X射线束的过滤装置。 偏心凸轮被定位成准直x射线束，并且可以独立地定位以提供x射线束的z轴校正。 过滤装置包括用于改变X射线束的多个过滤器。 在操作中，操作者选择测试的类型以及切片的数量和厚度。 在更改检测器和准直器配置后，收集每个切片的切片数据。