Improved B1 homogeneity of 3 Tesla breast MRI using dual-source parallel radiofrequency excitation.
Improved B1 homogeneity of 3 Tesla breast MRI using dual-source parallel radiofrequency excitation.
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DOI：
10.1002/jmri.23571
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发表时间：
2012-05
影响因子：
4.4
通讯作者：
Lehman, Constance D.
中科院分区：
文献类型：
--
作者：
Rahbar, Habib;Partridge, Savannah C.;DeMartini, Wendy B.;Gutierrez, Robert L.;Parsian, Sana;Lehman, Constance D.
关键词：
比较使用和不使用双源平行射频(RF)激励时，乳腺MRI B1在3特斯拉时的同质性。在机构审查委员会批准后，我们评估了在3特斯拉进行的14次连续乳腺MR检查，其中包括分别使用传统的单源和双源并行RF激励技术创建的3D B1图。我们测量了双侧多个位置：前、外侧、中央、内侧和后部的每个B1图上的B1值(以预期B1值的百分比表示)。计算平均全乳房和特定部位的B1值，并使用配对t检验对左右乳房进行比较。标准单源射频激励的左右乳房平均B1值差异有统计学意义(L-R，Δ=9.2%；p<；0.001)，而双源并行射频激励无明显差异(Δ=2.3%；p=0.085)。在单一来源的侧位(p=0.014)、中位(p=0.0001)、内位(p=0.0013)和后位(p<；0.0001)位置上，右侧和左侧的B1值有显著差异。相反，在双源平行射频激励下，只有前部(p=0.030)和侧部(p=0.0003)的B1值有显著差异。与标准的单源射频激励技术相比，双源并行射频激励在3T乳腺MRI上提高了B1的均匀性。
To compare breast MRI B1 homogeneity at 3 Tesla with and without dual-source parallel radiofrequency (RF) excitation. After institutional review board approval, we evaluated 14 consecutive breast MR examinations performed at 3 Tesla that included 3D B1 maps created separately with conventional single-source and dual-source parallel RF excitation techniques. We measured B1 values (expressed as % of intended B1) on each B1 map at nipple level in multiple bilateral locations: anterior, lateral, central, medial, and posterior. Mean whole breast and location specific B1 values were calculated and compared between right and left breasts using paired t-test. Mean whole breast B1 values differed significantly between right and left breasts with standard single-source RF excitation (difference L-R, Δ=9.2%; p<0.001) but not with dual-source parallel RF excitation (Δ=2.3%; p=0.085). Location specific B1 values differed significantly between right and left on single-source in the lateral (p=0.014), central (p=0.0001), medial (p=0.0013), and posterior (p<0.0001) locations. Conversely, mean B1 values differed significantly on dual-source parallel RF excitation for only the anterior (p=0.030) and lateral (p=0.0003) locations. B1 homogeneity is improved with dual-source parallel RF excitation on 3T breast MRI when compared to standard single-source RF excitation technique.
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