Improved Spatiotemporal Resolution in Echocardiography Using Mixed Geometry Imaging Sequences.
Improved Spatiotemporal Resolution in Echocardiography Using Mixed Geometry Imaging Sequences.
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使用混合几何成像序列提高超声心动图的时空分辨率。
DOI：
10.1109/tuffc.2024.3364051
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发表时间：
2024
期刊：
影响因子：
--
通讯作者：
Bottenus,Nick
中科院分区：
文献类型：
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作者：
Herrema,BlakeA;Eshkalak,NazliJavadi;Bottenus,Nick
心脏超声试图对人体最动态的环境——运动的心脏——进行成像。许多现代超声成像技术解决了空间和时间分辨率之间的权衡，要么使用窄聚焦光束，要么使用宽光束，合成孔径（SA）序列，这些序列被证明会受到运动伪影的影响。传统超声序列的回顾性编码（REFoCUS）统一了这些不同几何序列的处理，但这种方法的运动灵敏度还有待研究。我们假设，由REFoCUS方法实现的“混合序列”包含几个光束几何形状，可以更好地解决宽视场（FOV）和高帧率下的心脏运动。首先，在多个聚焦和宽传输剖面的仿真中评估了REFoCUS的运动灵敏度。聚焦传输比宽传输更有效地解决横向和轴向运动，其性能与传统波束形成技术相似。其次，设计了一种混合序列，用平面波传输对全视场进行失谐，用聚焦传输对关键运动目标进行失谐。这种混合序列在模拟和体内进行了测试，并用于对心脏和肝脏进行成像，这是一种低运动控制。通过将稀疏的PW序列（）与一小组靶向聚焦传输（= 10）相结合，可以更好地分辨出尖顶二尖瓣小叶（AML）。我们相信混合序列在临床相关帧率下具有强大的解决心脏运动的潜力。
Cardiac ultrasound seeks to image the most dynamic environment in the body—the moving heart. Many modern ultrasound imaging techniques address the tradeoff between spatial and temporal resolution using either narrow focused beams or with broad beam, synthetic aperture (SA) sequences that have been shown to suffer from motion artifacts. Retrospective encoding for conventional ultrasound sequences (REFoCUS) unifies the processing of these various geometric sequences, but the motion sensitivity of this approach has yet to be investigated. We hypothesize that a “mixed sequence” enabled by the REFoCUS method incorporating several beam geometries may better resolve cardiac motion over a wide field of view (FOV) and at a high frame rate. First, the motion sensitivity of REFoCUS was evaluated in simulation for several focused and broad transmit profiles. Focused transmissions resolve both lateral and axial motion much more effectively than broad transmissions, with performance similar to conventional beamforming techniques. Second, a mixed sequence was designed that insonifies the full field-of-view with plane wave (PW) transmissions and key moving targets with focused transmissions. This mixed sequence was tested in simulation and in vivo and was used to image the heart as well as the liver, a low-motion control. By combining a sparse PW sequence () with a small group of targeted focused transmissions (= 10), the anterior mitral valve leaflet (AML) at its peak observed velocity was better resolved. We believe that mixed sequences have strong potential to resolve cardiac motion at clinically relevant frame rates.