Point Spread Function Radial Component Implementation in Joseph's Forward Projector
    51.
    发明申请
    Point Spread Function Radial Component Implementation in Joseph's Forward Projector 有权
    约瑟夫前向投影仪中点扩散函数径向分量实现

    公开(公告)号:US20100067758A1

    公开(公告)日:2010-03-18

    申请号:US12561139

    申请日:2009-09-16

    IPC分类号: G06K9/00 G01N23/04

    CPC分类号: G06T11/006 G06T2211/424

    摘要: Point spread function (PSF) radial filtering in a line of response space. Modeling a radial component, R, of a point spread filter as a function of at least a radial projection index ρ, a radial image space coordinate r, and an azimuth θ. The index ρ is characterized by an asymmetrical Gaussian distribution having where σleft(r) and σright(r) derived from point source measurements, and an adjustment σJ(r, θ) estimated from point source sinogram by Josephs' projector.

    摘要翻译: 点扩散函数(PSF)径向滤波在一行响应空间。 将点扩展滤波器的径向分量R建模为至少径向投影指数&rgr;径向图像空间坐标r和方位角的函数。 指数 其特征在于具有不对称高斯分布,其具有来自点源测量的&sgr; left(r)和&sgr; right(r)以及通过Josephs投影仪从点源正弦图估计的调整&sgr; J(r,&thetas)。

    Normalization apparatus for panel detector PET scanners
    54.
    发明授权
    Normalization apparatus for panel detector PET scanners 失效
    面板检测仪PET扫描仪的归一化装置

    公开(公告)号:US06963065B2

    公开(公告)日:2005-11-08

    申请号:US10418520

    申请日:2003-04-18

    CPC分类号: G01T1/2985 A61B6/037

    摘要: A normalization apparatus and method for a PET scanner with panel detectors for obtaining an estimate of a normalization array, for correction for count rate effects on the normalization array, and for measurement of the relation between the normalization array and the count rate. The method of the present invention is based on two quasi-independent radial and axial components, which are count rate dependent due to sensitivity changes across the detector blocks. A scatter source is disposed at the center of the FOV and a scatter-free source is disposed at the outer edge of the FOV. The method computes the normalization array through several steps which evaluate the geometric profile, the axial profile, and the correction factor. A count rate correction is introduced to extend the normalization array to any count rate.

    摘要翻译: 一种具有面板检测器的PET扫描仪的归一化装置和方法,用于获得归一化阵列的估计,用于校正对归一化阵列的计数率影响,以及用于测量归一化阵列与计数率之间的关系。 本发明的方法是基于两个准独立的径向和轴向分量,其由于检测器块两端的灵敏度变化而依次计数。 散射源设置在FOV的中心,并且不分散源设置在FOV的外边缘处。 该方法通过评估几何轮廓,轴向轮廓和校正因子的几个步骤来计算归一化阵列。 引入计数率校正以将归一化数组扩展到任何计数率。

    Process for fabricating tuned light guide for photoelectrons
    56.
    发明授权
    Process for fabricating tuned light guide for photoelectrons 失效
    制造光电子调谐光导的工艺

    公开(公告)号:US4750972A

    公开(公告)日:1988-06-14

    申请号:US39916

    申请日:1987-04-20

    CPC分类号: G01T1/202 G01T1/2985

    摘要: A two dimensional photon position encoder system (10) and process which includes a detector (20) for enhancing the spatial resolution of the situs of the origin of incident photons of gamma rays. A plurality of scintillator material members (22) interact with the incident photons and produce a quantifiable number of photons which exit the scintillation material members. A tuned light guide (68) having a plurality of radiation barriers (92) of predetermined lengths define slots which are operatively associated with one of the scintillator material members. Photons exiting the scintillator material members (22) enter an operatively associated slot in said slotted light guide. These slots (90) serve to enhance the predictability of the statistical distribution of photons along the length of the slotted light guide (68). A detector (20) detects the distribution of the photons at preselected locations along the length of the slotted light guide. In one embodiment, this detector (20) comprises a photomultiplier (70) which gathers information concerning the photoelectrons which are then counted. The statistical distribution of these photoelectrons is processed by an improved pattern recognition technique such that the positioning information can be determined.

    摘要翻译: 一种二维光子位置编码器系统(10),其包括用于增强伽马射线入射光子原点的位置的空间分辨率的检测器(20)的处理。 多个闪烁体材料构件(22)与入射的光子相互作用并产生可从数量上闪烁的材料构件的数量的光子。 具有多个具有预定长度的辐射屏障(92)的调谐光导(68)限定与闪烁体材料构件之一可操作地相关的槽。 离开闪烁体材料构件(22)的光子进入所述开槽光导中的可操作地关联的狭槽。 这些槽(90)用于增强沿着带槽光导(68)的长度的光子的统计分布的可预测性。 检测器(20)沿着狭缝光导的长度检测预选位置处的光子的分布。 在一个实施例中,该检测器(20)包括光电倍增器(70),其收集关于光电子的信息,然后对其进行计数。 这些光电子的统计分布通过改进的模式识别技术来处理,使得可以确定定位信息。

    Two dimensional photon counting position encoder system and process
    57.
    发明授权
    Two dimensional photon counting position encoder system and process 失效
    二维光子计数位置编码器系统及过程

    公开(公告)号:US4743764A

    公开(公告)日:1988-05-10

    申请号:US677931

    申请日:1984-12-04

    IPC分类号: G01T1/202 G01T1/29 G01T1/20

    CPC分类号: G01T1/202 G01T1/2985

    摘要: A two dimensional photon position encoder system (10) and process which includes a detector (20) for enhancing the spatial resolution of the situs of the origin of incident photons of gamma rays. A plurality of scintillator material members (22) interact with the incident photons and produce a quantifiable number of photons which exit the scintillation material members. A tuned light guide (68) having a plurality of radiation barriers (92) of predetermined lengths define slots which are operatively associated with one of the scintillator material members. Photons exiting the scintillator material members (22) enter an operatively associated slot in said slotted light guide. These slots (90) serve to enhance the predictability of the statistical distribution of photons along the length of the slotted light guide (68). A detector (20) detects the distribution of the photons at preselected locations along the length of the slotted light guide. In one embodiment, this detector (20) comprises a photomultiplier (70) which gathers information concerning the photoelectrons which are then counted. The statistical distribution of these photoelectrons is processed by an improved pattern recognition technique such that the positioning information can be determined.

    摘要翻译: 一种二维光子位置编码器系统(10),其包括用于增强伽马射线入射光子原点的位置的空间分辨率的检测器(20)的处理。 多个闪烁体材料构件(22)与入射的光子相互作用并产生可从数量上闪烁的材料构件的数量的光子。 具有多个具有预定长度的辐射屏障(92)的调谐光导(68)限定与闪烁体材料构件之一可操作地相关的槽。 离开闪烁体材料构件(22)的光子进入所述开槽光导中的可操作地关联的狭槽。 这些槽(90)用于增强沿着带槽光导(68)的长度的光子的统计分布的可预测性。 检测器(20)沿着狭缝光导的长度检测预选位置处的光子的分布。 在一个实施例中,该检测器(20)包括光电倍增器(70),其收集关于光电子的信息,然后对其进行计数。 这些光电子的统计分布通过改进的模式识别技术来处理,使得可以确定定位信息。

    Point spread function radial component implementation in Joseph's forward projector
    59.
    发明授权
    Point spread function radial component implementation in Joseph's forward projector 有权
    约瑟夫向前投影机的点扩散功能径向元件实现

    公开(公告)号:US08509504B2

    公开(公告)日:2013-08-13

    申请号:US12561139

    申请日:2009-09-16

    IPC分类号: G06K9/00 G06K9/62

    CPC分类号: G06T11/006 G06T2211/424

    摘要: Point spread function (PSF) radial filtering in a line of response space. Modeling a radial component, R, of a point spread filter as a function of at least a radial projection index ρ, a radial image space coordinate r, and an azimuth θ. The index ρ is characterized by an asymmetrical Gaussian distribution having where σleft(r) and σright(r) derived from point source measurements, and an adjustment σJ(r, θ) estimated from point source sinogram by Josephs' projector.

    摘要翻译: 点扩散函数(PSF)径向滤波在一行响应空间。 将点扩展滤波器的径向分量R作为至少径向投影指数rho,径向图像空间坐标r和方位角θ的函数建模。 索引rho的特征在于具有不对称高斯分布,其中从点源测量得到sigmaleft(r)和sigmaright(r),以及通过Josephs投影仪从点源正弦图估计的调节σJ(r,θ)。

    Iterative image processing
    60.
    发明授权
    Iterative image processing 失效
    迭代图像处理

    公开(公告)号:US07949172B2

    公开(公告)日:2011-05-24

    申请号:US11771197

    申请日:2007-06-29

    IPC分类号: G06K9/00

    CPC分类号: G06T11/006 G06T2211/424

    摘要: A method for processing an image which has the steps of a) receiving acquired data necessary to obtain an image and estimating a preliminary image; b) selecting at least one image element within the image; c) performing an iterative algorithm for processing the image at least on the at least one image element; d) computing a difference between the processed at least one image element and the at least one image element; and e) repeating the steps c) and d) until the difference is below a predefined threshold.

    摘要翻译: 一种用于处理图像的方法,该方法具有以下步骤:a)接收获取图像所需的获得的数据并估计初步图像; b)选择图像内的至少一个图像元素; c)执行至少在所述至少一个图像元素处理所述图像的迭代算法; d)计算所处理的至少一个图像元素与所述至少一个图像元素之间的差异; 和e)重复步骤c)和d),直到该差值低于预定阈值。