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1.发明申请公开(公告)号：US20120098535A1
公开(公告)日：2012-04-26
申请号：US13377275
申请日：2010-06-04
CPC分类号： G01R33/56518
摘要： An object is to correct a magnetic field caused by an eddy current, which is generated due to application of a gradient magnetic field, not only in the application direction of the gradient magnetic field but also in a direction different from the application direction of the gradient magnetic field. In the present invention, in order to achieve this object, a compensation magnetic field which compensates for an eddy current magnetic field generated in each of an application direction of a test gradient magnetic field and a direction different from the application direction in each direction is calculated using the test gradient magnetic field. When generating an arbitrary gradient magnetic field, a compensation magnetic field which compensates for an eddy current magnetic field according to application of an arbitrary gradient magnetic field on the basis of the measured eddy current magnetic field in each direction is generated together with the arbitrary gradient magnetic field.
摘要翻译： 目的是校正由于施加梯度磁场而产生的涡流引起的磁场，不仅在梯度磁场的施加方向上，而且在与梯度的施加方向不同的方向上 磁场。 在本发明中，为了达到上述目的，计算出补偿磁场，该补偿磁场补偿在测试梯度磁场的施加方向和与各方向上的施加方向不同的方向中的每一方产生的涡流磁场 使用测试梯度磁场。 当产生任意梯度磁场时，根据任意梯度磁场的应用，根据在每个方向上测量的涡流磁场来补偿涡流磁场的补偿磁场与任意梯度磁场一起产生 领域。
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公开(公告)号：US09297876B2
公开(公告)日：2016-03-29
申请号：US13377275
申请日：2010-06-04
IPC分类号： G01R33/58 , G01R33/38 , G01R33/565
CPC分类号： G01R33/56518
摘要： An object is to correct a magnetic field caused by an eddy current, which is generated due to application of a gradient magnetic field, not only in the application direction of the gradient magnetic field but also in a direction different from the application direction of the gradient magnetic field. In the present invention, in order to achieve this object, a compensation magnetic field which compensates for an eddy current magnetic field generated in each of an application direction of a test gradient magnetic field and a direction different from the application direction in each direction is calculated using the test gradient magnetic field. When generating an arbitrary gradient magnetic field, a compensation magnetic field which compensates for an eddy current magnetic field according to application of an arbitrary gradient magnetic field on the basis of the measured eddy current magnetic field in each direction is generated together with the arbitrary gradient magnetic field.
摘要翻译： 目的是校正由于施加梯度磁场而产生的涡流引起的磁场，不仅在梯度磁场的施加方向上，而且在与梯度的施加方向不同的方向上 磁场。 在本发明中，为了达到上述目的，计算出补偿磁场，该补偿磁场补偿在测试梯度磁场的施加方向和与各方向上的施加方向不同的方向中的每一方产生的涡流磁场 使用测试梯度磁场。 当产生任意梯度磁场时，根据任意梯度磁场的应用，根据在每个方向上测量的涡流磁场来补偿涡流磁场的补偿磁场与任意梯度磁场一起产生 领域。
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公开(公告)号：US09541623B2
公开(公告)日：2017-01-10
申请号：US14116228
申请日：2012-05-23
申请人： Yusuke Hoshino , Akiko Kaneta , Shinji Kurokawa
发明人： Yusuke Hoshino , Akiko Kaneta , Shinji Kurokawa
IPC分类号： G01V3/00 , G01R33/56 , G01R33/561 , G01R33/58
CPC分类号： G01R33/56 , G01R33/5617 , G01R33/583
摘要： The purpose of the present invention is to obtain an image with a desired contrast while minimizing specific absorption rate and without deteriorating image quality in a variable refocus flip angle sequence. To this end, Teequiv specified by a signal decay pattern SSP obtained by a flip angle changing pattern FAP is compared with a designated Teequiv, and the flip angle changing pattern FAP is changed according to the comparison result to search for the flip angle changing pattern FAP which gives a desired contrast. Then, the flip angle changing pattern FAP which is capable of realizing the designated Teequiv is determined. Then, imaging is performed using each flip angle constitutes the determined flip angle changing pattern FAP.
摘要翻译： 本发明的目的是获得具有期望对比度的图像，同时最小化比吸收率并且不会使可变重聚焦翻转序列中的图像质量恶化。 为此，将通过翻转角度改变图案FAP获得的信号衰减图案SSP指定的Teequiv与指定的Teequiv进行比较，并且根据比较结果改变翻转角度改变图案FAP，以搜索翻转角度改变图案FAP 这给出了所需的对比度。 然后，确定能够实现指定的Teequiv的翻转角变化模式FAP。 然后，使用每个翻转角构成确定的翻转角改变图案FAP来执行成像。
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