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公开(公告)号：US20090141854A1
公开(公告)日：2009-06-04
申请号：US12301713
申请日：2007-05-24
申请人： Koichi Hirokawa , Taiga Goto , Yoshiaki Sugaya , Osamu Miyazaki
发明人： Koichi Hirokawa , Taiga Goto , Yoshiaki Sugaya , Osamu Miyazaki
摘要： An X-ray CT apparatus is provided, having a function for deciding an X-ray imaging condition prior to scanning, the X-ray imaging condition allowing an acquisition of contrast to noise ratio appropriate for identifying a diagnostic object. Prior to the real scan, a three-dimensional model of an object is estimated from scanogram projection data of the object, a contrast to noise ratio enabling identification of the diagnostic object is calculated, based on the diagnostic object size set by an operator via an operating device when planning the scan, the three-dimensional model, and a standard imaging condition that is stored in a storage device. Then, an optimum irradiated X-ray condition (tube current and tube voltage) is calculated for achieving the contrast to noise ratio enabling identification. The X-ray condition being calculated is displayed in the form of information such as image SD value and exposure dose, under the calculated X-ray condition and under other condition.
摘要翻译： 提供一种X射线CT装置，其具有用于在扫描之前决定X射线成像条件的功能，所述X射线成像条件允许获取适于识别诊断对象的对比度与噪声比。 在真实扫描之前，根据对象的扫描图投影数据估计对象的三维模型，基于由操作者经由操作者设置的诊断对象尺寸来计算能够识别诊断对象的对比度与噪声比 规划扫描时的操作装置，三维模型以及存储在存储装置中的标准成像条件。 然后，计算最佳照射X射线条件（管电流和管电压），以实现能够识别的对比度与噪声比。 在计算的X射线条件下和其他条件下，计算的X射线条件以诸如图像SD值和曝光剂量的信息的形式显示。
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公开(公告)号：US09208582B2
公开(公告)日：2015-12-08
申请号：US12092528
申请日：2006-10-31
申请人： Yasuo Omi , Ryo Takagi , Osamu Miyazaki , Yoshiaki Sugaya
发明人： Yasuo Omi , Ryo Takagi , Osamu Miyazaki , Yoshiaki Sugaya
CPC分类号： G06T7/608 , A61B6/03 , A61B6/461 , A61B6/469 , A61B6/501 , A61B6/507 , G06T7/0012 , G06T7/68 , G06T2207/30016
摘要： An image analysis system that analyzes an image of an object's organ having an anatomically symmetric shape includes: an image data read means that reads image data of the organ, a memory means that is connected to the image data read means, and stores the read image data, a display means that is connected to the memory means, and displays the image data as an image, a centerline setting means that is connected to the memory means, and sets a centerline of the organ in the image displayed on the display means, a region-of-interest setting means that is connected to the memory means, and uses the centerline to set a plurality of or at least one pair of regions of interest at anatomically symmetric opposite positions in the image of the organ, and an input means that is connected to the region-of-interest setting means, and inputs conditions for setting of the regions of interest in the image.
摘要翻译： 分析具有解剖学对称形状的物体的器官的图像的图像分析系统包括：读取器官的图像数据的图像数据读取装置，连接到图像数据读取装置的存储装置，并存储读取的图像 数据，连接到存储装置的显示装置，并将图像数据显示为图像;中心线设置装置，连接到存储装置，并且设置显示装置上显示的图像中的器官的中心线; 感兴趣区域设置装置连接到存储装置，并且使用中心线来在器官的图像中的解剖学对称的相对位置处设置多个或至少一对感兴趣的区域，以及输入装置 其连接到感兴趣区域设置装置，并且输入用于设置图像中的感兴趣区域的条件。
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公开(公告)号：US08983025B2
公开(公告)日：2015-03-17
申请号：US12525707
申请日：2008-02-07
申请人： Koichi Hirokawa , Yoshiaki Sugaya , Toshiyuki Irie
发明人： Koichi Hirokawa , Yoshiaki Sugaya , Toshiyuki Irie
CPC分类号： A61B6/542 , A61B6/032 , A61B6/4085 , A61B6/583 , G01T1/00
摘要： An X-ray CT apparatus is configured capable of properly calculating a radiation dosed amount more approximating to an actually exposed radiation dose that includes scattering rays of an examined object from data measured at the scanning time.A function or table showing a relationship between data obtained on the basis of the measured data of the object detected by an X-ray detector at the scanning time and the radiation dosed amount is stored in advance; and the X-ray CT apparatus calculates the radiation dosed amount of the object in accordance with the data obtained on the function or table showing the relationship between the data obtained on the basis of the measured data of the object stored in advance and the radiation dosed amount.
摘要翻译： X射线CT装置被配置为能够根据在扫描时间测量的数据，适当地计算更近似于实际暴露的辐射剂量的辐射剂量，其包括被检查物体的散射光线。 预先存储表示基于扫描时刻的X射线检测器检测出的被检体的测定数据和放射剂量之间的关系的函数或表， 并且X射线CT装置根据在功能或表上获得的数据来计算物体的辐射计量量，该数据表示基于预先存储的物体的测量数据与辐射计量获得的数据之间的关系 量。
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公开(公告)号：US20140226887A1
公开(公告)日：2014-08-14
申请号：US14112276
申请日：2012-04-04
CPC分类号： G06T7/0012 , A61B6/032 , A61B6/5205 , A61B6/5258 , A61B6/583 , G06T5/002 , G06T11/006 , G06T2207/10081 , G06T2207/20182 , G06T2207/30004 , G06T2211/424
摘要： With respect to projection data covering a plurality of sites, in order to create a medical image in which a uniform noise reduction effect is achieved for all sites within the projection data, an arithmetic device (5) determines one or more of proper subsets on the basis of scanning conditions and reconstruction conditions (step 2). Next, the arithmetic device (5) calculates a penalty-term weight for each proper subset on the basis of a detector output weight corresponding to a set element contained in the proper subset (step 3). Then, the arithmetic unit (5) performs an iterative approximation by using the penalty-term weight for each proper subset (step 4).
摘要翻译： 关于覆盖多个位置的投影数据，为了创建其中对投影数据内的所有位置实现均匀的降噪效果的医学图像，运算装置（5）确定一个或多个适当的子集， 扫描条件和重建条件的基础（步骤2）。 接下来，算术装置（5）基于与包含在适当子集中的集合元素相对应的检测器输出权重来计算每个适当子集的惩罚项权重（步骤3）。 然后，算术单元（5）通过使用每个适当子集的惩罚项权重来执行迭代近似（步骤4）。
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公开(公告)号：US08175217B2
公开(公告)日：2012-05-08
申请号：US12742797
申请日：2008-11-17
申请人： Yoshiaki Sugaya , Taiga Goto , Koichi Hirokawa , Osamu Miyazaki
发明人： Yoshiaki Sugaya , Taiga Goto , Koichi Hirokawa , Osamu Miyazaki
IPC分类号： A61B6/03
摘要： An X-ray CT apparatus is provided with an X-ray tube current modulation pattern calculation means that calculates an X-ray tube current modulation pattern based on a 3-dimensional model of an object calculated based on a scanogram image of the object, start-up shape acquisition means that acquires a start-up shape of CT values of a predetermined region of the object or CT value time differences after injecting contrast agent into the object, time contrast curve prediction means that predicts a time contrast curve indicative of a time sequential change of contrast in a diagnostic portion of the object at each slice position at a scan time based on the acquired start-up shape of the CT values or CT value time differences, object 3-dimensional model modification means that modifies a 3-dimensional model of the object based on the predicted time contrast curve, and X-ray tube electric current modulation pattern modification means that modifies the X-ray tube electric current modulation pattern based on the modified 3-dimensional model of the object.
摘要翻译： X射线CT装置设置有：X射线管电流调制图案计算装置，其基于基于对象的扫描图像计算的对象的3维模型来计算X射线管电流调制图案，起始 - 对象形状获取装置，用于获取对象的预定区域的CT值的启动形状或将对比剂注入对象后的CT值时间差;时间对比度曲线预测装置，其预测指示时间的时间对比度曲线 基于获取的CT值的启动形状或CT值时间差，在扫描时刻的每个切片位置处的对象的诊断部分中的对比度的顺序变化，对象3维模型修改装置，其修改3维 基于预测时间对比曲线的对象模型和X射线管电流调制模式修改装置，其修改X射线管电流调制拍摄 基于对象的修改后的三维模型。
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公开(公告)号：US20110091008A1
公开(公告)日：2011-04-21
申请号：US12999186
申请日：2009-06-29
申请人： Koichi Hirokawa , Yoshiaki Sugaya , Taiga Goto
发明人： Koichi Hirokawa , Yoshiaki Sugaya , Taiga Goto
CPC分类号： A61B6/032 , A61B6/482 , A61B6/5217 , A61B6/542
摘要： There is provided an X-ray CT apparatus that can control an irradiation X-ray dose in accordance with a displacement of an internal organ due to breathing of an examinee or the like with satisfying both of enhancement of image quality and lessening of exposed dose. In preparation processing before scan is started, an X-ray CT apparatus 1 generates a three-dimensional cross-section model from scanogram projection data of an examinee. An operator is made to input a site of interest, an assumed displacement amount of the site and a desired image quality index value. A scan planning unit 405d calculates an X-ray attenuation index from the three-dimensional cross-section model, and corrects the calculated X-ray attenuation index on the basis of the input site of interest, assumed displacement amount and image quality index value. The scan planning unit 405d further determines a tube current modulating pattern (irradiation X-ray dose modulating pattern) on the basis of the corrected X-ray attenuation index. When scanning is executed, an X-ray tube is controlled according to the determined irradiation X-ray dose modulating pattern, and controlled so as to obtain an optimum X-ray dose.
摘要翻译： 提供一种X射线CT装置，其可以满足受检者等的呼吸而根据内部器官的位移控制照射X射线剂量，同时满足图像质量的提高和暴露剂量的减少。 在扫描开始之前的准备处理中，X射线CT装置1从受检者的扫描图投影数据生成三维横截面模型。 使操作者输入感兴趣的位置，假定位置的位移量和期望的图像质量指标值。 扫描计划单元405d根据三维横截面模型计算X射线衰减指数，并且根据感兴趣的输入位置，假定位移量和图像质量指标值来校正所计算的X射线衰减指数。 扫描计划单元405d还基于校正的X射线衰减指数来确定管电流调制模式（照射X射线剂量调制模式）。 当执行扫描时，根据确定的照射X射线剂量调制图案来控制X射线管，并且被控制以获得最佳X射线剂量。
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公开(公告)号：US09254107B2
公开(公告)日：2016-02-09
申请号：US13820539
申请日：2011-09-04
申请人： Yoshiaki Sugaya , Taiga Goto , Koichi Hirokawa
发明人： Yoshiaki Sugaya , Taiga Goto , Koichi Hirokawa
CPC分类号： A61B6/032 , A61B6/4035 , A61B6/405 , A61B6/4085 , A61B6/465 , A61B6/467 , A61B6/542 , A61B6/544 , A61B6/545
摘要： In order to provide a technique of obtaining an image having high diagnosability without degrading the operability in an X-ray CT apparatus that suppresses the amount of exposure of an object by controlling the amount of radiation by setting a target image SD and determining the imaging conditions (tube current) satisfying the target image SD, there is provided an X-ray CT apparatus that controls the amount of radiation according to the size of an object in consideration of the contrast by simply inputting one image quality level as a reference of the image quality level that the operator desires. The input image quality level is set as a target image SD when scanning an object having a standard size with a standard tube voltage.
摘要翻译： 为了提供一种获得具有高诊断性的图像的技术，而不会降低通过设置目标图像SD来控制辐射量来抑制对象的曝光量的X射线CT装置中的可操作性，并且确定成像条件 （管电流）满足目标图像SD，提供了一种X射线CT装置，其通过简单地输入一个图像质量水平作为图像的参考来根据对象的尺寸来考虑对象的尺寸来控制辐射量 运营商所期望的质量水平。 当用标准管电压扫描具有标准尺寸的物体时，将输入图像质量等级设置为目标图像SD。
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18.发明授权Medical image processing device and medical image processing method, applying weighted penalty term in iterative approximation 有权医学图像处理装置和医学图像处理方法，迭代近似应用加权惩罚项公开(公告)号：US09123098B2
公开(公告)日：2015-09-01
申请号：US14112276
申请日：2012-04-04
CPC分类号： G06T7/0012 , A61B6/032 , A61B6/5205 , A61B6/5258 , A61B6/583 , G06T5/002 , G06T11/006 , G06T2207/10081 , G06T2207/20182 , G06T2207/30004 , G06T2211/424
摘要： With respect to projection data covering a plurality of sites, in order to create a medical image in which a uniform noise reduction effect is achieved for all sites within the projection data, an arithmetic device (5) determines one or more of proper subsets on the basis of scanning conditions and reconstruction conditions (step 2). Next, the arithmetic device (5) calculates a penalty-term weight for each proper subset on the basis of a detector output weight corresponding to a set element contained in the proper subset (step 3). Then, the arithmetic unit (5) performs an iterative approximation by using the penalty-term weight for each proper subset (step 4).
摘要翻译： 关于覆盖多个位置的投影数据，为了创建其中对投影数据内的所有位置实现均匀的降噪效果的医学图像，运算装置（5）确定一个或多个适当的子集， 扫描条件和重建条件的基础（步骤2）。 接下来，算术装置（5）基于与包含在适当子集中的集合元素相对应的检测器输出权重来计算每个适当子集的惩罚项权重（步骤3）。 然后，算术单元（5）通过使用每个适当子集的惩罚项权重来执行迭代近似（步骤4）。
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公开(公告)号：US08744040B2
公开(公告)日：2014-06-03
申请号：US13144326
申请日：2010-01-21
申请人： Yoshiaki Sugaya , Taiga Goto , Koichi Hirokawa
发明人： Yoshiaki Sugaya , Taiga Goto , Koichi Hirokawa
IPC分类号： A61B6/03
CPC分类号： A61B6/032 , A61B6/0407 , A61B6/0457 , A61B6/4035 , A61B6/405 , A61B6/469 , A61B6/542 , A61B6/544 , A61B6/545
摘要： An X-ray CT apparatus includes: an X-ray source which emits X-rays while rotating around a subject; a compensation filter which adjusts at least one of the output distribution and the spectral distribution of the X-rays emitted from the X-ray source to the subject; an X-ray detector which is disposed opposite to the X-ray source with the subject interposed therebetween, rotates together with the X-ray source, and detects the amount of X-rays transmitted through the compensation filter and the subject; an image operation unit which reconstructs a tomographic image of the subject on the basis of the detected amount of X-rays; a display unit which displays the tomographic image; a control unit which controls each of the constituent components; and a compensation unit which compensates for deterioration of image quality, which is based on the amount of displacement between the rotation center of the X-ray source and a desired position of the subject, by changing an X-ray tube current modulation pattern indicating a time-series change of emission of the X-rays and/or by moving the position of the subject.
摘要翻译： X射线CT装置包括：X射线源，其在围绕被检体旋转的同时发射X射线; 补偿滤波器，其将从X射线源发射的X射线的输出分布和光谱分布中的至少一个调整到被摄体; 与X射线源相对设置的X射线检测器，其间插入有对象，X射线检测器与X射线源一起旋转，并且检测通过补偿滤波器和被摄体传输的X射线的量; 图像操作单元，其基于检测到的X射线量重建对象的断层图像; 显示单元，其显示所述断层图像; 控制单元，其控制每个构成组件; 以及补偿单元，其通过改变表示X射线源的X射线管电流调制图案来补偿基于X射线源的旋转中心与被摄体的期望位置之间的位移量的图像质量的劣化 X射线发射的时间序列变化和/或移动被摄体的位置。
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公开(公告)号：US20110274240A1
公开(公告)日：2011-11-10
申请号：US13144326
申请日：2010-01-21
申请人： Yoshiaki Sugaya , Taiga Goto , Koichi Hirokawa
发明人： Yoshiaki Sugaya , Taiga Goto , Koichi Hirokawa
IPC分类号： A61B6/03
CPC分类号： A61B6/032 , A61B6/0407 , A61B6/0457 , A61B6/4035 , A61B6/405 , A61B6/469 , A61B6/542 , A61B6/544 , A61B6/545
摘要： An X-ray CT apparatus includes: an X-ray source which emits X-rays while rotating around a subject; a compensation filter which adjusts at least one of the output distribution and the spectral distribution of the X-rays emitted from the X-ray source to the subject; an X-ray detector which is disposed opposite to the X-ray source with the subject interposed therebetween, rotates together with the X-ray source, and detects the amount of X-rays transmitted through the compensation filter and the subject; an image operation unit which reconstructs a tomographic image of the subject on the basis of the detected amount of X-rays; a display unit which displays the tomographic image; a control unit which controls each of the constituent components; and a compensation unit which compensates for deterioration of image quality, which is based on the amount of displacement between the rotation center of the X-ray source and a desired position of the subject, by changing an X-ray tube current modulation pattern indicating a time-series change of emission of the X-rays and/or by moving the position of the subject.
摘要翻译： X射线CT装置包括：X射线源，其在围绕被检体旋转的同时发射X射线; 补偿滤波器，其将从X射线源发射的X射线的输出分布和光谱分布中的至少一个调整到被摄体; 与X射线源相对设置的X射线检测器，其间插入有对象，X射线检测器与X射线源一起旋转，并且检测通过补偿滤波器和被摄体传输的X射线的量; 图像操作单元，其基于检测到的X射线量重建对象的断层图像; 显示单元，其显示所述断层图像; 控制单元，其控制每个构成组件; 以及补偿单元，其通过改变表示X射线源的X射线管电流调制图案来补偿基于X射线源的旋转中心与被摄体的期望位置之间的位移量的图像质量的劣化 X射线发射的时间序列变化和/或移动被摄体的位置。
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