Two-dimensional imaging in a lightweight portable MRI scanner without gradient coils.
Two-dimensional imaging in a lightweight portable MRI scanner without gradient coils.
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DOI：
10.1002/mrm.25147
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发表时间：
2015-02
影响因子：
3.3
通讯作者：
Wald, Lawrence L.
中科院分区：
文献类型：
--
作者：
Cooley, Clarissa Zimmerman;Stockmann, Jason P.;Armstrong, Brandon D.;Sarracanie, Mathieu;Lev, Michael H.;Rosen, Matthew S.;Wald, Lawrence L.
作为脑部成像的首要模式，如果轻便、便携式系统可用于非常规位置，如重症监护室、医生办公室、外科手术室、救护车、急诊室、体育设施或农村医疗保健场所，那么MRI可以找到更广泛的适用性。我们构建并验证了一个真正便携式（<100 kg）和无声的概念验证MRI扫描仪，它用一个旋转的轻质无冷冻剂低场磁体取代了传统的梯度编码。当围绕对象旋转时，非均匀场图案用作旋转空间编码磁场（rSEM）以创建对迭代重建的2D图像进行编码的广义投影。多个接收通道用于消除非双射编码字段的歧义。该系统是验证与实验图像的2D测试体模。与其他非线性场编码方案类似，空间分辨率是位置相关的，中心模糊，但被证明可能足以用于许多医疗应用。所提出的MRI扫描仪通过同时放松磁体均匀性标准和消除梯度线圈来展示便携性的潜力。这种新的架构和编码方案显示了令人信服的概念图像证明，预计将进一步改进校准和方法。
As the premiere modality for brain imaging, MRI could find wider applicability if lightweight, portable systems were available for siting in unconventional locations such as Intensive Care Units, physician offices, surgical suites, ambulances, emergency rooms, sports facilities, or rural healthcare sites. We construct and validate a truly portable (<100kg) and silent proof-of-concept MRI scanner which replaces conventional gradient encoding with a rotating lightweight cryogen-free, low-field magnet. When rotated about the object, the inhomogeneous field pattern is used as a rotating Spatial Encoding Magnetic field (rSEM) to create generalized projections which encode the iteratively reconstructed 2D image. Multiple receive channels are used to disambiguate the non-bijective encoding field. The system is validated with experimental images of 2D test phantoms. Similar to other non-linear field encoding schemes, the spatial resolution is position dependent with blurring in the center, but is shown to be likely sufficient for many medical applications. The presented MRI scanner demonstrates the potential for portability by simultaneously relaxing the magnet homogeneity criteria and eliminating the gradient coil. This new architecture and encoding scheme shows convincing proof of concept images that are expected to be further improved with refinement of the calibration and methodology.
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影响因子：
3.3
作者：
Knoll F;Schultz G;Bredies K;Gallichan D;Zaitsev M;Hennig J;Stollberger R
通讯作者：
Stollberger R
影响因子：
2
作者：
GORDON, R;BENDER, R;HERMAN, GT
通讯作者：
HERMAN, GT
影响因子：
2.9
作者：
Sharp, Jonathan C.;King, Scott B.;Tomanek, Boguslaw
通讯作者：
Tomanek, Boguslaw
影响因子：
2.2
作者：
Perlo, J;Casanova, F;Blümich, B
通讯作者：
Blümich, B
影响因子：
2.2
作者：
JACKSON, JA;BURNETT, LJ;HARMON, JF
通讯作者：
HARMON, JF