公开(公告)号：US20100014630A1

公开(公告)日：2010-01-21

申请号：US12527009

申请日：2008-02-14

申请人： Taiga Goto ,  Koichi Hirokawa ,  Toshiyuki Irie

发明人： Taiga Goto ,  Koichi Hirokawa ,  Toshiyuki Irie

IPC分类号： A61B6/03 ,  A61B6/00

CPC分类号： A61B5/4869 ,  A61B6/50 ,  A61B6/505 ,  A61B6/542

摘要： An X-ray CT apparatus acquires a scanogram of an object to be examined, generates an ellipse model having an X-ray attenuation coefficient equivalent to that of water and approximated to a tomographic image of the obtained imaged portion from the feature quantity of the projection value profile, determines whether or not the generated elliptic model is adequate as a model of the imaged portion from another feature quantity with respect to the projection value profile, generates a corrected elliptic model according to yet another feature quantity with respect to the projection value profile if the elliptic model is determined to be inadequate, and controls the modulation of the tube current in an X-ray source so that a predetermined target SD value is maintained in any scanning position when a tomographic image is reconstructed according to X-rays transmitted through the object by using the elliptic model or the corrected elliptic model.

摘要翻译： X射线CT装置获取待检查对象的扫描图，生成具有与水的X射线衰减系数相当的X射线衰减系数的椭圆模型，并从投影的特征量近似于所获得的成像部的断层图像 值轮廓，根据另一特征量相对于投影值轮廓确定生成的椭圆模型是否足够作为成像部分的模型，根据与投影值轮廓相关的另一特征量生成校正的椭圆模型 如果椭圆模型被确定为不足，并且控制X射线源中的管电流的调制，使得当根据透射的X射线重建断层图像时，在任何扫描位置保持预定的目标SD值 该对象通过使用椭圆模型或校正的椭圆模型。

公开(公告)号：US07945013B2

公开(公告)日：2011-05-17

申请号：US12527009

申请日：2008-02-14

申请人： Taiga Goto ,  Koichi Hirokawa ,  Toshiyuki Irie

发明人： Taiga Goto ,  Koichi Hirokawa ,  Toshiyuki Irie

IPC分类号： A61B6/00

CPC分类号： A61B5/4869 ,  A61B6/50 ,  A61B6/505 ,  A61B6/542

摘要： An X-ray CT apparatus acquires a scanogram of an object to be examined, generates an ellipse model having an X-ray attenuation coefficient equivalent to that of water and approximated to a tomographic image of the obtained imaged portion from the feature quantity of the projection value profile, determines whether or not the generated elliptic model is adequate as a model of the imaged portion from another feature quantity with respect to the projection value profile, generates a corrected elliptic model according to yet another feature quantity with respect to the projection value profile if the elliptic model is determined to be inadequate, and controls the modulation of the tube current in an X-ray source so that a predetermined target SD value is maintained in any scanning position when a tomographic image is reconstructed according to X-rays transmitted through the object by using the elliptic model or the corrected elliptic model.

摘要翻译： X射线CT装置获取待检查对象的扫描图，生成具有与水的X射线衰减系数相当的X射线衰减系数的椭圆模型，并从投影的特征量近似于所获得的成像部的断层图像 值轮廓，根据另一特征量相对于投影值轮廓确定生成的椭圆模型是否足够作为成像部分的模型，根据与投影值轮廓相关的另一特征量生成校正的椭圆模型 如果椭圆模型被确定为不足，并且控制X射线源中的管电流的调制，使得当根据透射的X射线重建断层图像时，在任何扫描位置保持预定的目标SD值 该对象通过使用椭圆模型或校正的椭圆模型。

公开(公告)号：US08971607B2

公开(公告)日：2015-03-03

申请号：US13989564

申请日：2011-12-07

申请人： Taiga Goto ,  Hisashi Takahashi ,  Koichi Hirokawa

发明人： Taiga Goto ,  Hisashi Takahashi ,  Koichi Hirokawa

IPC分类号： G06K9/00 ,  G06T11/00 ,  A61B6/03 ,  A61B6/00

CPC分类号： G06T11/003 ,  A61B6/032 ,  A61B6/4078 ,  G06T11/006 ,  G06T2211/421

摘要： In order to execute a high-resolution reconstructible distance-driven back projection process and to generate a high-resolution tomographic image, an X-ray CT apparatus 1 determines the presence/absence of opposing data corresponding to each piece of target data on the basis of scanning conditions, and calculates a phase range where opposing data is present (Step 21). The X-ray CT apparatus 1 performs high-resolution conversion of a zero-insertion method on a phase range where opposing data is present, and performs high-resolution conversion using a data interpolation method on a phase range where no opposing data is present, thereby creating double sampled high-resolution projection data, and calculates a view weight (Step 22). The X-ray CT apparatus 1 performs a distance-driven high-resolution back projection process using high-resolution projection data and generates a reconstructed image (Step 23).

摘要翻译： 为了执行高分辨率可重构的距离驱动反投影处理并生成高分辨率断层图像，X射线CT装置1基于每个目标数据确定对应的数据的存在/不存在 并计算相对数据存在的相位范围（步骤21）。 X射线CT装置1在存在相对数据的相位范围上执行零插入方式的高分辨率变换，并且在不存在相反数据的相位范围上使用数据插值方法进行高分辨率转换， 从而产生双重采样的高分辨率投影数据，并计算视图权重（步骤22）。 X射线CT装置1使用高分辨率投影数据进行距离驱动的高分辨率反投影处理，并生成重构图像（步骤23）。

公开(公告)号：US20140193055A1

公开(公告)日：2014-07-10

申请号：US14128769

申请日：2012-07-05

申请人： Hisashi Takahashi ,  Taiga Goto ,  Koichi Hirokawa

发明人： Hisashi Takahashi ,  Taiga Goto ,  Koichi Hirokawa

IPC分类号： G06T11/00

CPC分类号： G06T11/006 ,  G06T2211/412 ,  G06T2211/424

摘要： To provide an image reconstruction device capable of creating an image with image quality matching the operator's request when a cross-sectional image is reconstructed through a repeated calculation, the image reconstruction device which performs a repeated calculation on the basis of a difference between calculated projection data and measured projection data, the calculated projection data being obtained by performing a forward projection calculation on a reconstructed image which is reconstructed based on the measured projection data, includes an input section to which an image quality parameter which is considered to be important by an operator is input, a weight calculation section that calculates a weighting coefficient on the basis of the image quality parameter, and a repeated calculation section that performs a repeated calculation on the basis of a value obtained by weighting and adding a pixel value obtained in the previous iteration to a pixel value obtained from now using the weighting coefficient.

摘要翻译： 为了提供一种能够通过重复计算重建横截面图像时，能够创建具有与操作者的请求相匹配的图像质量的图像重建装置，该图像重建装置基于计算出的投影数据之间的差进行重复计算 并且测量的投影数据，通过对基于测量的投影数据重建的重建图像执行前向投影计算而获得的所计算的投影数据包括输入部分，被认为对于运营商来说重要的图像质量参数 基于图像质量参数计算加权系数的权重计算部分，以及基于通过对在先前迭代中获得的像素值进行加权和相加而获得的值来执行重复计算的重复计算部分 到从现在使用的像素值 加权系数。

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

IPC分类号： A61B6/03 ,  A61B6/00

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。

公开(公告)号：US20130028500A1

公开(公告)日：2013-01-31

申请号：US13635391

申请日：2011-03-29

申请人： Hisashi Takahashi ,  Taiga Goto ,  Koichi Hirokawa

发明人： Hisashi Takahashi ,  Taiga Goto ,  Koichi Hirokawa

IPC分类号： G06K9/00

CPC分类号： A61B6/032 ,  A61B6/06 ,  A61B6/5205 ,  G06T11/006 ,  G06T2211/424

摘要： In order to provide a reconstruction computing device, a reconstruction computing method, and an X-ray CT apparatus capable of improving the image quality while reducing the amount of computation when reconstructing an X-ray CT image using an iterative method, a reconstruction computing device divides an initial image 50 reconstructed using an analytical method such as an FBP method into a bed region 51, an object region 52, and the other air region 53, sets reconstruction conditions including at least convergence conditions and a pixel size for each of the divided regions, updates estimation images by performing an iterative process, and fixes estimation images or forward projection data of a subset satisfying the convergence conditions until other subsets satisfy the convergence conditions.

摘要翻译： 为了提供一种重建计算装置，重构计算方法和能够在使用迭代方法重建X射线CT图像的同时减少计算量的同时提高图像质量的X射线CT装置，重建计算装置 将使用诸如FBP方法的分析方法重建的初始图像50划分到床区域51，对象区域52和另一空气区域53中，设置至少包括收敛条件的重建条件和分割的每个的像素大小 区域，通过执行迭代处理更新估计图像，并且修正满足收敛条件的子集的估计图像或前向投影数据，直到其他子集满足收敛条件。

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。

公开(公告)号：US20090257553A1

公开(公告)日：2009-10-15

申请号：US12374161

申请日：2007-07-18

申请人： Taiga Goto ,  Koichi Hirokawa

发明人： Taiga Goto ,  Koichi Hirokawa

IPC分类号： H05G1/60

CPC分类号： G06T11/005 ,  A61B6/032

摘要： An X-ray CT apparatus that can obtain a tomogram having high spatial resolution without increasing the effect of system noise and dosage is provided. The X-ray CT apparatus has an X-ray source for emitting X-ray, an X-ray detector having plural X-ray detecting elements that detect X-ray transmitted through an examinee as attenuation data and are arranged in a channel direction, a data combining unit for combining attenuation data of plural X-ray detecting elements in the channel direction to obtain composite data, a data decomposing unit for decomposing composite data to obtain respective decomposition data of the plural X-ray detecting elements, and an image re-constructing unit for re-constructing an image of the examinee by using the decomposition data.

摘要翻译： 提供了可以获得具有高空间分辨率而不增加系统噪声和剂量的影响的X射线CT装置。 X射线CT装置具有用于发射X射线的X射线源，具有多个X射线检测元件的X射线检测器，该X射线检测元件检测通过受检者发射的X射线作为衰减数据并沿通道方向排列， 数据组合单元，用于组合在信道方向上的多个X射线检测元件的衰减数据以获得复合数据;数据分解单元，用于分解复合数据以获得多个X射线检测元件的各自的分解数据;以及图像恢复 - 构造单元，用于通过使用分解数据重新构造受检者的图像。

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

IPC分类号： H05G1/66 ,  G06K9/00

CPC分类号： A61B6/032 ,  A61B6/542 ,  A61B6/545

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。

公开(公告)号：US07505550B2

公开(公告)日：2009-03-17

申请号：US11629756

申请日：2005-06-15

申请人： Taiga Goto ,  Osamu Miyazaki ,  Koichi Hirokawa ,  Hiroto Kokubun

发明人： Taiga Goto ,  Osamu Miyazaki ,  Koichi Hirokawa ,  Hiroto Kokubun

IPC分类号： A61B6/00

CPC分类号： G06T11/005 ,  A61B6/027 ,  A61B6/032 ,  A61B6/4085 ,  A61B6/503 ,  A61B6/541 ,  G06T2211/412

摘要： A radiotomograph comprises radiation detecting means which applies radiation from a radiation source to a subject from many direction and detects radiation transmitted through the subject from the directions, a bed on which the subject lies and which can move the subject in the direction of the body axis of the subject, reconstruction parameter setting means which sets reconstruction parameters including the amount of movement of the bed in the direction of the body axis and used to reconstruct, an image of the subject, reconstruction view area calculating means which calculates the reconstruction view area for at least one data segment necessary for reconstruction calculation determined for each position in a space reconstructed according to the set reconstruction parameters, reference segment position setting means which sets a reference segment position in the calculated reconstruction view area according to a phase signal generated by dynamic state analysis of the subject, effective segment calculating means which calculates an effective segment from the data segment containing the set reference segment position using a predetermined weight function, and image creating means for creating an image by reconstructing the calculated effective segment. With this, a radiotomograph both having an improved time resolution and enabling reduced effective radiation exposure can be provided.

摘要翻译： 放射图像仪包括辐射检测装置，其从多个方向向受检者施加辐射，并从被检者所在的方向上检测通过被检体的方向传播的辐射，并且可以沿着身体轴线的方向移动受检者 重建参数设置装置，其重建参数，其包括床体在身体轴线方向上的运动量并用于重构对象的重建参数，重建视区计算装置，其计算重建视区， 根据所设定的重建参数重建的空间中的每个位置确定重建计算所需的至少一个数据段，基准段位置设定装置，根据由动态生成的相位信号，在计算出的重建视区内设定基准段位置 分析主题，效果 e段计算装置，其使用预定的权重函数从包含所述设置的参考段位置的数据段计算有效段;以及图像创建装置，用于通过重建所计算的有效段来创建图像。 因此，可以提供具有改善的时间分辨率并且能够实现减少的有效辐射暴露的放射图像仪。