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公开(公告)号：US5590165A
公开(公告)日：1996-12-31
申请号：US335772
申请日：1994-11-09
申请人： Makoto Gohno , Tetsuya Horiuchi
发明人： Makoto Gohno , Tetsuya Horiuchi
CPC分类号： G06T7/0081 , A61B5/4872 , A61B6/032 , A61B6/4035 , A61B6/405 , A61B6/482 , A61B6/583 , G06T7/0012 , G06F19/321 , G06F19/3487 , G06T2207/10081 , G06T2207/30004 , Y10S378/901
摘要： A method of generating an image representing fat distributions, comprising the steps of scanning two different levels of tube voltage using a phantom containing a sample rod of a fat standard material and a plurality of sample rods with different densities of a bone mineral equivalent material, to generate two cross sectional image data; detecting the CT number of each pixel in an entire region or an objective region of the cross sectional image data as the CT number of a tissue including fat (.alpha.wf); detecting the CT number of the bone mineral equivalent material to calculate a linear regression between the CT number and the density of the bone mineral equivalent material and to define the CT number of a tissue excluding fat (.alpha.nf); detecting the CT number of the fat standard material (.alpha.ff), while detecting the CT number of a soft tissue standard material (.alpha.st), wherein individual CT numbers are applied to the equation.alpha.wf=.alpha.nf+.beta..multidot.(.alpha.ff-.alpha.st)with .beta. defined as a fat ratio parameter; calculating the fat ratio parameter .beta. of each pixel in the entire region or an objective region of the cross sectional image data using the foregoing equation, with attention focused on the finding that the density of the bone mineral equivalent material is constant at scanning at any different level of tube voltage, and finally generating an image based on the fat ratio parameter .beta..
摘要翻译： PCT No.PCT / JP93 / 00696 Sec。 371日期：1994年11月9日 102（e）1994年11月9日日期PCT提交1993年5月25日PCT公布。 出版物WO93 / 24054 日期1993年12月9日一种产生代表脂肪分布的图像的方法，包括以下步骤：使用包含脂肪标准材料的样品棒的体模和具有不同密度的骨的多个样品棒来扫描两个不同级别的管电压 矿物当量材料，产生两个截面图像数据; 检测横截面图像数据的整个区域或目标区域中的每个像素的CT数作为包括脂肪（αwf）的组织的CT数; 检测骨矿物当量材料的CT数，以计算CT数和骨矿物当量材料的密度之间的线性回归，并定义不包括脂肪（αnf）的组织的CT数; 检测脂肪标准物质的CT数（αff），同时检测软组织标准物质（αst）的CT数，其中各个CT数应用于方程αwf =αnf +βx（αff- αst），β被定义为脂肪比参数; 使用上述等式计算整个区域或横截面图像数据的每个像素的每个像素的脂肪比参数β，注意力集中在以下发现：骨矿物当量材料的密度在任何不同的扫描处是恒定的 管电压水平，最后根据脂肪比参数β生成图像。
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公开(公告)号：US20070286332A1
公开(公告)日：2007-12-13
申请号：US11757732
申请日：2007-06-04
摘要： The present invention aims to obtain a tomographic image similar in image quality to a tomographic image obtained by executing a scan at X-ray tube current value set by an X-ray automatic exposure function even when the X-ray tube current value set by the X-ray automatic exposure function are not within a standard range of the X-ray tube current values settable at the X-ray tube (21). X-ray tube current value supplied to the X-ray tube (21) are set by the X-ray automatic exposure function. Thereafter, when the X-ray tube current value set by the X-ray automatic exposure function is not within in the standard range of the X-ray tube current value settable at the X-ray tube, the X-ray tube current value at a portion not within the standard range are changed so as to be within the standard range, and the set value of helical pitch is changed so as to correspond to the ratio between the pre-changed x-ray tube current value and the post-changed X-ray tube current value.
摘要翻译： 本发明的目的在于获得与通过由X射线自动曝光功能设定的X射线管电流值执行扫描而获得的断层图像相似的断层图像，即使当由X射线管电流值 X射线自动曝光功能不在X射线管（21）可设定的X射线管电流值的标准范围内。 通过X射线自动曝光功能设定供给X射线管（21）的X射线管电流值。 此后，当通过X射线自动曝光功能设定的X射线管电流值不在可设置在X射线管的X射线管电流值的标准范围内时，X射线管电流值在 不在标准范围内的部分被改变为在标准范围内，并且改变螺距的设定值，以便对应于预先改变的X射线管电流值和后变化的X射线管电流值之间的比率 X射线管电流值。
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公开(公告)号：US06445764B1
公开(公告)日：2002-09-03
申请号：US09747545
申请日：2000-12-22
申请人： Makoto Gohno , Masatake Nukui , Tetsuya Horiuchi , Akira Hagiwara
发明人： Makoto Gohno , Masatake Nukui , Tetsuya Horiuchi , Akira Hagiwara
IPC分类号： A61B600
摘要： For the purpose of reconstructing a plurality of X-ray tomographic images having a plurality of practical slice thicknesses while reducing the number of X-ray detector arrays and simplifying configuration, X-rays generated by an X-ray tube 4 are emitted via a slit 15 of a collimator 6 toward a detector 8 disposed opposite to the X-ray tube 4; the length (width) of the collimator 6's slit 15 in the D1 direction and the position of the collimator 6 in the D1 direction are adjustable; the detector 8 is comprised of four X-ray detector arrays; and the widths of the two outer X-ray detector arrays in the D1 direction are larger than the widths of the two center X-ray detector arrays.
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公开(公告)号：US07639776B2
公开(公告)日：2009-12-29
申请号：US11757732
申请日：2007-06-04
IPC分类号： A61B6/00
摘要： The present invention aims to obtain a tomographic image similar in image quality to a tomographic image obtained by executing a scan at X-ray tube current value set by an X-ray automatic exposure function even when the X-ray tube current value set by the X-ray automatic exposure function are not within a standard range of the X-ray tube current values settable at the X-ray tube (21). X-ray tube current value supplied to the X-ray tube (21) are set by the X-ray automatic exposure function. Thereafter, when the X-ray tube current value set by the X-ray automatic exposure function is not within in the standard range of the X-ray tube current value settable at the X-ray tube, the X-ray tube current value at a portion not within the standard range are changed so as to be within the standard range, and the set value of helical pitch is changed so as to correspond to the ratio between the pre-changed x-ray tube current value and the post-changed X-ray tube current value.
摘要翻译： 本发明的目的在于获得与通过由X射线自动曝光功能设定的X射线管电流值执行扫描而获得的断层图像相似的断层图像，即使当由X射线管电流值 X射线自动曝光功能不在X射线管（21）可设定的X射线管电流值的标准范围内。 通过X射线自动曝光功能设定供给X射线管（21）的X射线管电流值。 此后，当通过X射线自动曝光功能设定的X射线管电流值不在可设置在X射线管的X射线管电流值的标准范围内时，X射线管电流值在 不在标准范围内的部分被改变为在标准范围内，并且改变螺距的设定值，以便对应于预先改变的X射线管电流值和后变化的X射线管电流值之间的比率 X射线管电流值。
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5.发明授权Tomographic imaging scan condition determining method, tomographic imaging method and X-ray CT apparatus 有权断层扫描成像扫描条件确定方法，断层成像方法和X射线CT装置公开(公告)号：US06404844B1
公开(公告)日：2002-06-11
申请号：US09718165
申请日：2000-11-21
申请人： Tetsuya Horiuchi , Makoto Gohno
发明人： Tetsuya Horiuchi , Makoto Gohno
IPC分类号： A61B603
摘要： For the purpose of determining a radiation dose without excess or insufficiency with respect to an allowed value of image noise in performing a helical scan by a CT apparatus comprising a multi-detector, a method comprises the steps of: selecting an image thickness of an X-ray tomographic image to be produced by a helical scan by an X-ray CT apparatus comprising a multi-detector (Step ST1); provisionally determining an X-ray dose in obtaining the X-ray tomographic image having the image thickness by single-slice CT using a single-slice CT radiation dose determining algorithm (Step ST2); selecting a scan protocol (Step ST3); reading a dose correction factor from a dose correction factor table that matches the selected image thickness (Step ST4); correcting the X-ray dose by the dose correction factor (Step ST5); determining tomographic imaging scan conditions by specifying at least one of the tube current and the emission time (Step ST6); and performing the helical scan and displaying an X-ray tomographic image (Step ST7). Consequently, a disadvantage that a subject is exposed more than necessary can be prevented.
摘要翻译： 为了在通过包括多检测器的CT装置进行螺旋扫描时确定相对于图像噪声的允许值而没有过多或不足的辐射剂量的目的，方法包括以下步骤：选择X的图像厚度 通过由包括多检测器的X射线CT装置进行螺旋扫描而生成的片断层析图像（步骤ST1）; 使用单片CT辐射剂量确定算法临时确定通过单层CT获得具有图像厚度的X射线断层图像的X射线剂量（步骤ST2）; 选择扫描协议（步骤ST3）; 从与所选图像厚度匹配的剂量校正因子表读取剂量校正因子（步骤ST4）; 通过剂量校正因子校正X射线剂量（步骤ST5）; 通过规定管电流和发射时间中的至少一个来确定层析成像扫描条件（步骤ST6）; 并执行螺旋扫描并显示X射线断层图像（步骤ST7）。 因此，可以防止受试者暴露于需要以外的缺点。
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公开(公告)号：US5521955A
公开(公告)日：1996-05-28
申请号：US343510
申请日：1994-11-21
申请人： Makoto Gohno , Tetsuya Horiuchi
发明人： Makoto Gohno , Tetsuya Horiuchi
IPC分类号： C12N15/09 , A61B6/00 , A61B6/03 , A61K48/00 , A61K49/00 , C07H21/04 , C12N5/10 , C12N9/14 , C12N9/88 , C12N15/12 , C12Q1/68
摘要： A method for quantitatively determining bone mineral mass by a CT system, comprising scanning an objective region together with a plurality of samples produced by mixing a water equivalent material with various ratios of a standard material equivalent to bone mineral mass and determining the bone mineral density of the objective region with reference to the CT numbers of the samples, wherein a plurality of samples are scanned together with the objective region at one or multiple levels of tube voltage and a corrected CT number of each sample is calculated by substituting the CT number of each of the samples with the CT number of blood or a standard material equivalent to blood. By scanning at a single level of tube voltage, bone mineral density is determined, on the basis of the CT number of the objective region and with reference to the corrected CT numbers. On the other hand, by scanning at multiple levels of tube voltage, bone mineral density is determined on the basis of the CT number of the objective region and with reference to the corrected CT numbers while excluding the effect of fat. In the foregoing manner errors due to blood and fat are corrected.
摘要翻译： PCT No.PCT / JP93 / 00698 Sec。 371日期：1994年11月21日 102（e）日期1994年11月21日PCT提交1993年5月25日PCT公布。 出版物WO93 / 24055 日期：1993年12月9日。一种用于通过CT系统定量测定骨矿物质量的方法，包括将目标区域与多个样品一起扫描，所述多个样品通过混合具有等同于骨矿物质质量的标准材料的各种比例的水当量材料 并且参照样本的CT号确定目标区域的骨矿物质密度，其中多个样本与管电压的一个或多个级别与目标区域一起扫描，并且计算每个样品的校正CT数 通过用CT数量的血液或相当于血液的标准物质代替每个样品的CT数。 通过在单电压管电压下进行扫描，根据目标区域的CT数量和参照校正的CT数确定骨矿物质密度。 另一方面，通过在管电压的多个级别进行扫描，基于目标区域的CT数，参照校正的CT号码，而不考虑脂肪的影响，确定骨矿物质密度。 以上述方式校正由血液和脂肪引起的错误。
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公开(公告)号：US20080144764A1
公开(公告)日：2008-06-19
申请号：US11956813
申请日：2007-12-14
申请人： Akihiko Nishide , Makoto Gohno
发明人： Akihiko Nishide , Makoto Gohno
IPC分类号： A61B6/03
CPC分类号： A61B6/405 , A61B6/027 , A61B6/4035 , A61B6/542 , A61B6/583
摘要： The present invention provides an X-ray CT apparatus capable of improving image quality of a dual energy image. The X-ray CT apparatus comprises an X-ray tube for applying X rays having a first energy spectrum and X rays having a second energy spectrum different from the first energy spectrum to a subject, an X-ray data acquisition unit for acquiring X-ray projection data of the first energy spectrum projected onto the subject and X-ray projection data of the second energy spectrum projected thereonto, dual energy image reconstructing unit for image-reconstructing tomographic images indicative of X-ray tube voltage-dependent information at X-ray absorption coefficients related to a distribution of atoms, based on the X-ray projection data of the first energy spectrum and the X-ray projection data of the second energy spectrum, and adjusting unit for adjusting conditions for the image reconstruction in order to optimize the tomographic images indicative of the X-ray tube voltage-dependent information.
摘要翻译： 本发明提供能够提高双能量图像的图像质量的X射线CT装置。 X射线CT装置包括：X射线管，用于将具有第一能谱的X射线和具有与第一能谱不同的第二能谱的X射线施加到被检体; X射线数据获取单元， 投影到被摄体上的第一能量谱的射线投影数据和投射到其上的第二能量谱的X射线投影数据，双能量图像重建单元，用于将X射线管电压依赖信息的X射线管电压依赖性信息进行图像重建， 基于第一能谱的X射线投影数据和第二能谱的X射线投影数据的与原子分布相关的射线吸收系数，以及用于调整图像重建的条件的调整单元，以优化 所述断层图像指示所述X射线管电压依赖性信息。
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公开(公告)号：US20070110210A1
公开(公告)日：2007-05-17
申请号：US11559494
申请日：2006-11-14
CPC分类号： A61B6/032 , A61B6/027 , A61B6/4085
摘要： Tomography or X-ray CT fluoroscopy reduced in exposure to radiation in an X-ray CT apparatus or an X-ray CT fluoroscopic apparatus is to be substantialized. A channel-direction X-ray collimator or a beam forming X-ray filter is positionally controlled in the channel direction to carry out X-ray data acquisition while irradiation with X-rays limited to only the region of interest. Either the profile area of the whole subject is obtained or the profile area of the whole subject is predicted from views or scout images of irradiation of the whole subject out of X-ray projection data. Image reconstruction of views not irradiating the whole subject out of the collected X-ray projection data is carried out by predicting lacking parts from the profile area of the whole subject and making corrections accordingly. It is thereby made possible to irradiate only the region of interest with X-rays to reduce the exposure of the subject of tomography by the X-ray CT apparatus to X-rays or the exposure the subject to X-rays and the exposure of the operator's hands to radiation at the time of puncturing in X-ray CT fluoroscopy.
摘要翻译： X射线CT装置或X射线CT荧光检查装置中的放射线照射减少的层析成像术或X射线CT透视图被实质化。 在通道方向上位置地控制通道方向X射线准直仪或束形成X射线滤波器，以在仅限于感兴趣区域的X射线的照射下进行X射线数据采集。 获得整个被摄体的轮廓区域，或者通过X射线投影数据从整个被摄体的照射的视图或侦察图像中预测整个被摄体的轮廓区域。 通过从整个被摄体的轮廓区域预测缺少的部分并进行相应的校正来进行从收集的X射线投影数据中不照射整个被摄体的视图的图像重建。 由此，能够仅利用X射线照射感兴趣区域，以将X射线CT装置的X线摄影对象的X射线照射或X射线照射， 手术时用X射线CT透视时穿刺手术。
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公开(公告)号：US07187756B2
公开(公告)日：2007-03-06
申请号：US10924111
申请日：2004-08-23
申请人： Makoto Gohno , Akira Hagiwara
发明人： Makoto Gohno , Akira Hagiwara
IPC分类号： H01J35/10
CPC分类号： A61B6/405 , A61B6/032 , A61B6/4028 , A61B6/4035 , A61B6/482 , G01N23/046 , G01N2223/419 , H01J35/10 , H01J35/14 , H01J2235/086
摘要： An X-ray CT apparatus capable of imaging a subject based on X-rays of multiple energy levels while using an ordinary X-ray detector includes an X-ray tube which generates X-rays from multiple focal points of different 3-dimensional positions sequentially on a time-division basis, a plurality of filters which implement the filtering individually for the X-rays generated individually from the focal points, a collimator which equalizes the irradiation range of the X-rays generated individually from the focal points, collection means which collects projection data of multiple views of a subject of imaging for the X-rays generated individually from the focal points, and reconstruction means which reconstructs an image based on the projection data. The anode of the X-ray tube has multiple impingement portions where electrons released by the cathode impinge at multiple positions on the trajectory of electrons sequentially on a time-division basis.
摘要翻译： 在使用普通X射线检测器的情况下，能够基于多个能级的X射线成像被检体的X射线CT装置包括从不同的3维位置的多个焦点依次产生X射线的X射线管 在时分的基础上，对从焦点分别生成的X射线分别进行滤波的多个滤波器，使来自焦点单独产生的X射线的照射范围相等的准直仪，收集装置， 收集从焦点单独产生的X射线的成像对象的多个视图的投影数据，以及基于投影数据重建图像的重建装置。 X射线管的阳极具有多个冲击部分，其中由阴极释放的电子在时间基础上依次冲击电子轨迹上的多个位置。
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公开(公告)号：US20050053188A1
公开(公告)日：2005-03-10
申请号：US10926697
申请日：2004-08-26
申请人： Makoto Gohno
发明人： Makoto Gohno
CPC分类号： A61B6/032 , A61B6/027 , A61B6/4035 , A61B6/5282 , G01N23/046 , G01N2223/419
摘要： An apparatus for improving the tomographic image quality by preventing the tomographic image contrast from degrading and preventing artifact from occurring even if many scattered radiations occur. An X-ray detection array obtains first detection data using the X-ray detection elements corresponding to an area not shielded by a collimator. Further, the X-ray detection array obtains second detection data using the X-ray detection elements corresponding to an area shielded by the collimator. A central processing unit corrects the first detection data based on the detection data including the first and second detection data. Finally, the central processing unit generates a tomographic image for an imaging area of the imaging object.
摘要翻译： 一种用于通过防止层析图像对比度降低并且即使发生许多散射辐射也不发生伪像而改善断层图像质量的装置。 X射线检测阵列使用与未被准直仪遮蔽的区域对应的X射线检测元件来获取第一检测数据。 此外，X射线检测阵列使用与由准直仪屏蔽的区域相对应的X射线检测元件来获得第二检测数据。 中央处理单元基于包括第一和第二检测数据的检测数据来校正第一检测数据。 最后，中央处理单元生成成像对象的成像区域的断层图像。
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