TSENSE ACCELERATED BILATERAL 3D SPIRAL BREAST IMAGING

该子项目是利用该技术的众多研究子项目之一 资源由 NIH/NCRR 资助的中心拨款提供。子项目和 研究者 (PI) 可能已从 NIH 的另一个来源获得主要资金， 因此可以在其他 CRISP 条目中表示。列出的机构是 对于中心来说，它不一定是研究者的机构。 目的：动态对比乳腺 MRI 需要高时间和空间分辨率。为了提高需要覆盖两个大体积的双侧乳腺成像的时间分辨率，我们将快速 3D 螺旋成像和时间灵敏度编码 (TSENSE) 加速结合起来。 方法：使用双波段光谱空间脉冲来激发两个乳房，以提供强大的脂肪抑制功能以及每个乳房体积的独立空间和光谱轮廓。 “螺旋堆栈”成像轨迹用于快速 k 空间采集。我们通过在板层方向应用 TSENSE 来加快成像速度。 对于时间帧，所有偶数 kz 平面在所有奇数 kz 平面之前获取。 奇数帧和偶数帧一起可用于估计线圈灵敏度函数。 然后，可以使用灵敏度编码 (SENSE) 来填充奇数组和偶数组中缺失的平面，从而将帧速率加快两倍。

This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. The subproject and investigator (PI) may have received primary funding from another NIH source, and thus could be represented in other CRISP entries. The institution listed is for the Center, which is not necessarily the institution for the investigator. PURPOSE: Dynamic contrast breast MRI requires both high temporal and spatial resolution. To increase temporal resolution in bilateral breast imaging which needs to cover two large volumes, we combine rapid 3D spiral imaging and temporal sensitivity-encoding (TSENSE) acceleration. METHODS: A dual-band spectral-spatial pulse was used to excite both breasts for providing robust fat suppression and an independent spatial and spectral profile for each breast volume. The "stack-of-spirals" imaging trajectory was used for a rapid k-space acquisition. We accelerated an imaging speed by applying TSENSE in the slab direction. All even kz-planes are acquired before all odd kz-planes for time frame. The odd and even frames together can be used to estimate coil sensitivity functions. Then sensitivity-encoding (SENSE) can be used to fill in missing planes in both the odd and even sets, to accelerate the frame rate by a factor of two.