The Wave Controlled Aliasing In Parallel Imaging (Wave-CAIPI) technique manifests great potential to highly accelerate three-dimensional (3D) balanced steady-state free precession (bSSFP) through substantially reducing the geometric factor (g-factor) and aliasing artifacts of image reconstruction. However, severe banding artifacts appear in bSSFP imaging due to unbalanced gradients with nonzero 0 ^th moment applied by the conventional Wave-CAIPI technique. In this study, we propose a 3D Wave-bSSFP scheme that adopts truncated wave gradients with zero 0 ^th moment to avoid introducing additional banding artifacts and to maintain the advantages of wave encoding. The simulation results indicate that the number of wave cycles that are truncated and different options of applying wave gradients affect both the g-factor reduction and image quality, but the influence is limited. In phantom experiments, the proposed technique shows similar acceleration performance as the conventional Wave-CAIPI technique and effectively eliminates its introduced banding artifacts. Additionally, Wave-bSSFP obtains up to $12\times $ retrospective acceleration at 0.8 mm isotropic resolution in in vivo 3D brain experiments and is superior to the state-of-the-art Controlled Aliasing In Parallel Imaging Results IN Higher Acceleration (CAIPIRINHA) technique, according to both visual validation and quantitative analysis. Moreover, in vivo 3D spine and abdomen imaging demonstrate the potential clinical applications of Wave-bSSFP with fast acquisition speed, improved isotropic resolution and fine image quality.

中文翻译：

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使用带有截断波梯度的改进Wave-CAIPI技术加速3D bSSFP。

并行成像中的波控混叠（Wave-CAIPI）技术显示出极大的潜力，可以通过大大减少图像的几何因子（g-factor）和混叠伪像来极大地加速三维（3D）平衡稳态自由进动（bSSFP）重建。然而，严重的带状伪影，由于不平衡梯度具有非零0出现在bSSFP成像 ^个时刻施加通过常规波CAIPI技术。在这项研究中，我们建议采用截波梯度零0 3D波bSSFP方案 ^日避免引入额外的带状伪像，并保持波形编码的优势。仿真结果表明，被截断的波周期数和应用波梯度的不同选项都会影响g因子的减小和图像质量，但是影响是有限的。在幻像实验中，提出的技术显示出与常规Wave-CAIPI技术相似的加速性能，并有效消除了其引入的条带伪影。此外，Wave-bSSFP最多可获得 $ 12 \次$ 根据视觉验证和定量分析，在体内3D脑实验中以0.8毫米各向同性分辨率实现了回顾性加速，并且优于并行加速高成像并行成像结果（CAIPIRINHA）技术中最新的控制别名。此外，体内3D脊柱和腹部成像证明Wave-bSSFP具有潜在的临床应用，其采集速度快，各向同性分辨率提高和图像质量优良。