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公开(公告)号：US20130156151A1
公开(公告)日：2013-06-20
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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公开(公告)号：US20110135182A1
公开(公告)日：2011-06-09
申请号：US13056830
申请日：2009-07-30
申请人： Taiga Goto , Yoshiaki Sugaya , Koichi Hirokawa
发明人： Taiga Goto , Yoshiaki Sugaya , Koichi Hirokawa
IPC分类号： G06K9/00
CPC分类号： G06T11/006 , A61B6/032 , A61B6/5258 , G06T2211/421
摘要： In order to provide a CT image forming method that can reduce an artifact caused by an image reconstructing method, and an X-ray CT apparatus using the same, an X-ray CT image forming method according to the invention is characterized in that an artifact component caused by the image reconstructing method of the projection data is obtained by calculation; the determined artifact component is subtracted from the projection data to create corrected projection data containing an inverted artifact component, and image reconstruction is executed on the corrected projection data to obtain a reconstructed image from which the artifact is reduced. The inverted artifact component is obtained as differential between the projection data and re-projection data obtained by inversely projecting a reconstructed image which is obtained by reconstructing the projection data concerned.
摘要翻译： 为了提供可以减少由图像重建方法引起的伪影的CT图像形成方法和使用其的X射线CT装置，根据本发明的X射线CT图像形成方法的特征在于， 通过计算获得由投影数据的图像重建方法引起的分量; 从投影数据中减去所确定的伪影分量，以产生包含反向伪像分量的校正投影数据，并且对校正的投影数据执行图像重建以获得从其中减少伪像的重建图像。 通过反投影通过重构相关投影数据而获得的重建图像获得的投影数据和再投影数据之间的差分，获得反向伪像分量。
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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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4.发明授权公开(公告)号：US08737711B2
公开(公告)日：2014-05-27
申请号：US13056830
申请日：2009-07-30
申请人： Taiga Goto , Yoshiaki Sugaya , Koichi Hirokawa
发明人： Taiga Goto , Yoshiaki Sugaya , Koichi Hirokawa
IPC分类号： G06K9/00
CPC分类号： G06T11/006 , A61B6/032 , A61B6/5258 , G06T2211/421
摘要： In order to provide a CT image forming method that can reduce an artifact caused by an image reconstructing method, and an X-ray CT apparatus using the same, an X-ray CT image forming method according to the invention is characterized in that an artifact component caused by the image reconstructing method of the projection data is obtained by calculation; the determined artifact component is subtracted from the projection data to create corrected projection data containing an inverted artifact component, and image reconstruction is executed on the corrected projection data to obtain a reconstructed image from which the artifact is reduced. The inverted artifact component is obtained as differential between the projection data and re-projection data obtained by inversely projecting a reconstructed image which is obtained by reconstructing the projection data concerned.
摘要翻译： 为了提供可以减少由图像重建方法引起的伪影的CT图像形成方法和使用其的X射线CT装置，根据本发明的X射线CT图像形成方法的特征在于， 通过计算获得由投影数据的图像重建方法引起的分量; 从投影数据中减去所确定的伪影分量，以产生包含反向伪像分量的校正投影数据，并且对校正的投影数据执行图像重建以获得从其中减少伪像的重建图像。 通过反投影通过重构相关投影数据而获得的重建图像获得的投影数据和再投影数据之间的差分，获得反向伪像分量。
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公开(公告)号：US08270560B2
公开(公告)日：2012-09-18
申请号：US12866484
申请日：2009-02-25
申请人： Koichi Hirokawa , Taiga Goto , Yoshiaki Sugaya
发明人： Koichi Hirokawa , Taiga Goto , Yoshiaki Sugaya
摘要： There are provided an X-ray CT scan simulator and an X-ray CT apparatus in which a lesion postulated by an operator can be displayed on a simulation image and a high-precision simulation containing a postulation of occurrence of a new lesion can be performed. They comprise an image storing device for storing a reference image, a target noise value setting device for setting a target noise value of a desired image, a simulated lesion setting device for setting a condition for a simulated lesion postulated by the operator, a simulation image generating device for generating a simulation image containing a simulated lesion by using the reference image on the basis of the set target noise value and the condition for the simulated lesion, and an image display device for displaying the simulation image containing the simulated lesion.
摘要翻译： 提供了X射线CT扫描模拟器和X射线CT装置，其中可以在模拟图像上显示由操作者假设的病变，并且可以执行包含新病变的发生假设的高精度模拟 。 它们包括用于存储参考图像的图像存储装置，用于设置所需图像的目标噪声值的目标噪声值设置装置，用于设置由操作者假定的模拟病变的条件的模拟病变设置装置，模拟图像 生成装置，用于基于设定的目标噪声值和模拟病变的条件，通过使用参考图像来生成包含模拟病变的模拟图像;以及图像显示装置，用于显示包含模拟病变的模拟图像。
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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：US08744039B2
公开(公告)日：2014-06-03
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： An X-ray CT apparatus is provided that generates a three-dimensional cross-section model from scanogram projection data of an examinee. An operator inputs a site of interest, an assumed displacement amount of the site and a desired image quality index value. A scan planning unit 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 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： 提供了一种由受检者的扫描图投影数据生成三维横截面模型的X射线CT装置。 操作员输入感兴趣的位置，假定位置的位移量和期望的图像质量指标值。 扫描计划单元从三维横截面模型计算X射线衰减指数，并根据感兴趣的输入位置，假定的位移量和图像质量指标值来校正计算的X射线衰减指数。 扫描计划单元进一步基于校正的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：US07813471B2
公开(公告)日：2010-10-12
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
IPC分类号： A61B6/00
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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