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公开(公告)号：US20210208222A1
公开(公告)日：2021-07-08
申请号：US16735228
申请日：2020-01-06
IPC分类号： G01R33/385 , G01R33/563 , G01R33/48
摘要： The techniques discussed herein relate to a reduced acoustic noise and vibration magnetic resonance imaging (MRI) acquisition. In certain implementations acoustic noise levels for one or more MRI pulse sequences are characterized and modified by limiting the frequencies and amplitudes of the gradient waveforms so as to produce less noise and vibration when the modified waveform is used during an MRI examination. In this manner, relatively low sound pressure levels can be attained.
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2.发明申请公开(公告)号：US20200265318A1
公开(公告)日：2020-08-20
申请号：US16276135
申请日：2019-02-14
摘要： A method of reconstructing imaging data into a reconstructed image may include training a generative adversarial network (GAN) to reconstruct the imaging data. The GAN may include a generator and a discriminator. Training the GAN may include determining a combined loss by adaptively adjusting an adversarial loss based at least in part on a difference between the adversarial loss and a pixel-wise loss. Additionally, the combined loss may be a combination of the adversarial loss and the pixel-wise loss. Training the GAN may also include updating the generator based at least in part on the combined loss. The method may also include receiving, into the generator, the imaging data and reconstructing, via the generator, the imaging data into a reconstructed image.
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公开(公告)号：US09766314B2
公开(公告)日：2017-09-19
申请号：US14257713
申请日：2014-04-21
IPC分类号： G01R33/28 , G01R33/56 , G01R33/561 , G01R33/36 , G01R33/483
CPC分类号： G01R33/4833
摘要： A system, non-transitory computer-readable medium, and method of designing quiet variable-rate MRI slice-select pulses includes creating discretized first slice-select constant-amplitude gradient and RF waveforms, associating discretized time points having a first constant time increment with the first waveforms, selecting a scaling function that smooths the gradient waveform when multiplied together, multiplying the gradient and RF waveforms by the corresponding value of the scaling function to create second gradient and RF waveforms, dividing the time increment between the discretized time points by the corresponding value of the scaling function to create a remapped time increment, cumulatively summing the remapped time increments to create a remapped time scale, interpolating the second gradient and RF waveforms along the remapped time scale to form final gradient and RF waveforms, and providing the final gradient and RF waveforms for incorporation into an MRI pulse sequence.
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公开(公告)号：US20170132788A1
公开(公告)日：2017-05-11
申请号：US14936903
申请日：2015-11-10
CPC分类号： G06T7/0014 , A61B5/02007 , A61B5/022 , A61B5/026 , A61B5/0285 , A61B5/055 , A61B5/7275 , G06T7/11 , G06T7/62 , G06T2207/10088 , G06T2207/30104 , G16H30/40 , G16H50/30
摘要： A method for determining an arterial pulse wave velocity representative of a health condition of a blood vessel includes receiving an image data set comprising a plurality of images of a subject, from an imaging modality. The method also involves determining a blood vessel region in an image from the plurality of images. The method further includes determining a plurality of cross-sectional area values of a blood vessel at a plurality of locations in the blood vessel region, corresponding to a plurality of phases of a cardiac cycle of the subject and determining a plurality of flow rate values of blood flowing in the blood vessel corresponding to the plurality of cross-sectional area values. The method also includes determining a hemodynamic model based on the plurality of cross-sectional area values and the plurality of blood flow rate values and determining the arterial pulse wave velocity based on the hemodynamic model.
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公开(公告)号：US09513352B2
公开(公告)日：2016-12-06
申请号：US13629636
申请日：2012-09-28
IPC分类号： G01R33/3415 , G01R33/54 , G01R33/36
CPC分类号： G01R33/3642 , G01R33/3415 , G01R33/3692
摘要： A system for inductively communicating signals in a magnetic resonance imaging system is presented. The system includes first array of primary coils configured to acquire data from a patient positioned on a patient cradle. Furthermore, the system includes a second array of secondary coils operatively coupled to the first array of primary coils. Moreover, the system includes a third array of tertiary coils disposed at a determined distance from the second array of secondary coils. In addition, the system includes a tuning unit operatively coupled to the third array of tertiary coils by a cable having a quarter-wave electrical wavelength and configured to control the first array of primary coils through impedance transformation, where the second array of secondary coils is configured to inductively communicate the acquired data to the third array of tertiary coils.
摘要翻译： 提出了一种用于在磁共振成像系统中感应地传达信号的系统。 该系统包括被配置为从位于病人支架上的患者获取数据的第一阵列的初级线圈。 此外，该系统包括可操作地耦合到第一初级线圈阵列的次级线圈的第二阵列。 此外，该系统包括第三阵列的三级线圈，其布置在与第二阵列的次级线圈确定的距离处。 另外，该系统包括调谐单元，该调谐单元通过具有四分之一波电波长的电缆可操作地耦合到第三阵列的第三线圈，并被配置为通过阻抗变换来控制第一阵列的初级线圈，其中第二阵列的次级线圈是 被配置为将获取的数据感应地传送到第三线圈的第三阵列。
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6.发明申请SYSTEMS AND METHODS FOR COMPRESSED SENSING FOR MULTI-SHELL MAGNETIC RESONANCE IMAGING 有权用于多小波磁共振成像的压缩感测系统和方法公开(公告)号：US20150310640A1
公开(公告)日：2015-10-29
申请号：US14261623
申请日：2014-04-25
发明人： Christopher Judson Hardy , Luca Marinelli , Marion Irene Menzel , Ek Tsoon Tan , Jonathan Immanuel Sperl
CPC分类号： G06T11/006 , G01R33/4826 , G01R33/5611 , G01R33/56341 , G06T7/0012 , G06T2207/10088 , G06T2207/20056
摘要： A method of compressed sensing for multi-shell magnetic resonance imaging includes obtaining magnetic resonance imaging data, the data being sampled along multi-shell spherical coordinates, the spherical coordinates coincident with a plurality of spokes that converge at an origin, constructing a symmetric shell for each respective sampled multi-shell to create a combined set of data, performing a three-dimensional Fourier transform on the combined set of data to reconstruct an image, and de-noising the reconstructed image by iteratively applying a sparsifying transform on non-sampled data points of neighboring shells. The method can also include randomly under-sampling the imaging data to create missing data points. A system configured to implement the method and a non-transitory computer readable medium are also disclosed.
摘要翻译： 一种用于多壳磁共振成像的压缩感测方法包括：获得磁共振成像数据，所述数据沿着多壳球面坐标进行采样，所述球面坐标与在原点收敛的多个辐条重合，构成对称壳体 每个相应的采样多壳以产生一组组合数据，对该组合数据进行三维傅里叶变换以重构图像，并通过对非采样数据迭代地应用稀疏变换来对重构图像进行去噪 相邻炮弹点。 该方法还可以包括随机对取样数据进行低采样以创建丢失的数据点。 还公开了一种被配置为实现该方法的系统和一种非暂时计算机可读介质。
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公开(公告)号：US20150094562A1
公开(公告)日：2015-04-02
申请号：US14043220
申请日：2013-10-01
IPC分类号： G01R33/567 , A61B5/055 , G01R33/48
CPC分类号： G01R33/5673 , A61B5/0205 , A61B5/0402 , A61B5/055 , A61B5/7285 , G01R33/5602 , G01R33/5607
摘要： A magnetic field may be applied to a subject having a plurality of tissues, including first and second tissues, causing a net longitudinal magnetization in the tissues. An inversion radio frequency pulse may be generated to invert the longitudinal magnetization from the tissues. Heart-rate timing information associated with a current ECG of the subject may be measured, and an inversion time TI may be dynamically calculated based at least in part on the heart-rate timing information. An excitation radio frequency pulse may then be generated. The generation of the excitation radio frequency pulse may occur a period of time after the generation of the inversion radio frequency pulse, and the period of time may be based on the dynamically calculated inversion time TI. Magnetic resonance imaging data may then be acquired.
摘要翻译： 可以向具有多个组织的对象施加磁场，包括第一和第二组织，从而在组织中产生净纵向磁化强度。 可以产生反转射频脉冲以反转来自组织的纵向磁化强度。 可以测量与对象的当前ECG相关联的心率定时信息，并且可以至少部分地基于心率定时信息动态地计算反转时间TI。 然后可以产生激发射频脉冲。 激发射频脉冲的产生可以在产生反向射频脉冲之后的一段时间内发生，并且该时间段可以基于动态计算的反转时间TI。 然后可以获取磁共振成像数据。
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公开(公告)号：US11307278B2
公开(公告)日：2022-04-19
申请号：US16733037
申请日：2020-01-02
摘要： The subject matter discussed herein relates to a fast magnetic resonance imaging (MRI) method to suppress fine-line artifact in Fast-Spin-Echo (FSE) images reconstructed with a deep-learning network. The network is trained using fully sampled NEX=2 (Number of Excitations equals to 2) data. In each case, the two excitations are combined to generate fully sampled ground-truth images with no fine-line artifact, which are used for comparison with the network generated image in the loss function. However, only one of the excitations is retrospectively undersampled and inputted into the network during training. In this way, the network learns to remove both undersampling and fine-line artifacts. At inferencing, only NEX=1 undersampled data are acquired and reconstructed.
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公开(公告)号：US10438355B2
公开(公告)日：2019-10-08
申请号：US14936903
申请日：2015-11-10
IPC分类号： A61B6/00 , G06T7/00 , A61B5/02 , A61B5/022 , A61B5/026 , A61B5/055 , A61B5/00 , A61B5/0285 , G06T7/11 , G06T7/62 , G16H50/30 , G16H30/40
摘要： A method for determining an arterial pulse wave velocity representative of a health condition of a blood vessel includes receiving an image data set comprising a plurality of images of a subject, from an imaging modality. The method also involves determining a blood vessel region in an image from the plurality of images. The method further includes determining a plurality of cross-sectional area values of a blood vessel at a plurality of locations in the blood vessel region, corresponding to a plurality of phases of a cardiac cycle of the subject and determining a plurality of flow rate values of blood flowing in the blood vessel corresponding to the plurality of cross-sectional area values. The method also includes determining a hemodynamic model based on the plurality of cross-sectional area values and the plurality of blood flow rate values and determining the arterial pulse wave velocity based on the hemodynamic model.
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公开(公告)号：US09897678B2
公开(公告)日：2018-02-20
申请号：US13866820
申请日：2013-04-19
发明人： Ek Tsoon Tan , Christopher Judson Hardy , Kevin Franklin King , Zachary William Slavens , Luca Marinelli , Robert Marc Lebel
IPC分类号： G01V3/00 , G01R33/565 , G01R33/563
CPC分类号： G01R33/56581 , G01R33/56341 , G01R33/56572
摘要： Systems and methods for correcting magnetic resonance (MR) data are provided. One method includes receiving the MR data and correcting errors present in the MR data due to non-uniformities in magnetic field gradients used to generate the diffusion weighted MR signals. The method also includes correcting errors present in the MR data due to concomitant gradient fields present in the magnetic field gradients by using one or more gradient terms. At least one of the gradient terms is corrected based on the correction of errors present in the MR data due to the non-uniformities in the magnetic field gradients.
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