公开(公告)号：US20150146952A1

公开(公告)日：2015-05-28

申请号：US14523776

申请日：2014-10-24

Applicant: SHIMADZU CORPORATION

Inventor： Nobuya HASHIZUME ,  Keishi KITAMURA ,  Yoshiyuki YAMAKAWA ,  Tetsuya KOBAYASHI

IPC: G06T11/00 ,  A61B6/03 ,  A61B6/00

CPC classification number: A61B6/5235 ,  A61B6/037 ,  A61B6/4208 ,  A61B6/483 ,  A61B6/502 ,  A61B6/5205 ,  G06T11/005

Abstract: In a reconstruction processing (S1), reconstruction processing is performed to list mode data to firstly capture a reconstruction image. Then, in a projection step (S2), the reconstruction image obtained in the reconstruction processing step is projected to capture a projection image. In a scatter component extracting step S4, low-frequency components are extracted from the projection image obtained in the projection step to obtain scatter components. Even when the data contains a missing region, the reconstruction processing unlikely to be influenced by the missing region suppresses the influence by the missing, and the resultant reconstruction image is projected. Consequently, the projection image having dummy data being interpolated to the missing region is obtainable. As a result, projection from the list mode data through the reconstruction image achieves the projection image with no missing data. Accordingly, precious estimation of the scatter components is obtainable.

Abstract translation: 在重建处理（S1）中，进行重构处理以列出模式数据，以首先捕获重建图像。 然后，在投影步骤（S2）中，投影在重建处理步骤中获得的重建图像以捕获投影图像。 在散射分量提取步骤S4中，从投影步骤中获得的投影图像中提取低频分量，以获得散射分量。 即使数据包含缺失区域，不可能受缺失区域影响的重构处理也能够抑制缺失区域的影响，并且投影出所得到的重建图像。 因此，可以获得具有内插到缺失区域的伪数据的投影图像。 结果，从列表模式数据通过重建图像的投影实现了没有丢失数据的投影图像。 因此，可以获得散射分量的宝贵估计。

公开(公告)号：US20240037818A1

公开(公告)日：2024-02-01

申请号：US18221161

申请日：2023-07-12

Applicant: SHIMADZU CORPORATION

Inventor： Yoshiyuki YAMAKAWA

IPC: G06T11/00

CPC classification number: G06T11/008 ,  G06T2211/424

Abstract: An image processing method includes a reconstruction step of reconstructing a radiographic image of a subject by performing reconstruction processing on radiological data of the subject, a count number calculation step of calculating a count number in a subject area in the radiographic image, a standard deviation calculation step of calculating a noise standard deviation in the radiographic image from a relation between the count number in each of a plurality of pre-acquired function calculation radiographic images and the noise standard deviation, by substituting the count number in the subject area into a pre-acquired basic noise deviation function a function in which a value of the count number and a value of the noise standard deviation correspond to each other, and a noise reduction processing step of performing NLM filter processing on the radiographic image using the noise standard deviation calculated in the standard deviation calculation step.

公开(公告)号：US20160278726A1

公开(公告)日：2016-09-29

申请号：US15034148

申请日：2013-11-05

Applicant: SHIMADZU CORPORATION

Inventor： Yoshiyuki YAMAKAWA

IPC: A61B6/00 ,  G01T1/29 ,  A61B6/03

CPC classification number: A61B6/5217 ,  A61B6/037 ,  A61B6/502 ,  A61B6/5205 ,  G01T1/2985 ,  G06T7/149 ,  G06T2207/10104 ,  G06T2207/20161 ,  G06T2207/30068

Abstract: A contour extracting unit of a contour image generating device performs one-time contour extraction to a two-dimensional reconstruction image by a contour extracting model so as to extract a second shape of a contour from a first shape of a contour. A completion determining unit determines whether or not a rate of change is smaller than a threshold. The rate of change is a ratio of a varied area and a sum of pixel values of pixels in the varied area, the varied area being between the first shape of the contour and the second shape of the contour. When the rate of change is large, a repetitive controller performs control to operate the contour extracting unit and the like again. When the rate of change is small, the repetitive controller performs control to output a two-dimensional contour image containing the second shape of the contour.

Abstract translation: 轮廓图像生成装置的轮廓提取单元通过轮廓提取模型对二维重建图像进行一次轮廓提取，以从轮廓的第一形状提取轮廓的第二形状。 完成确定单元确定变化率是否小于阈值。 变化率是变化区域与变化区域中像素的像素值之和的比率，变化区域在轮廓的第一形状和轮廓的第二形状之间。 当变化率大时，重复控制器再次执行操作轮廓提取单元等的控制。 当变化率小时，重复控制器执行控制以输出包含轮廓的第二形状的二维轮廓图像。

公开(公告)号：US20200174144A1

公开(公告)日：2020-06-04

申请号：US16627151

申请日：2017-07-25

Applicant: Shimadzu Corporation

Inventor： Yoshiyuki YAMAKAWA

IPC: G01T1/29

Abstract: A scattering estimation method includes determining a convolution kernel for smoothing a single scattering distribution based on a scattered radiation index value (R) of a radioactive image (5) (S4) and fitting, to positron emission tomography measurement data, a scattering distribution smoothed by applying the convolution kernel to the single scattering distribution (S5).