Frame rate considerations for real-time abdominal acoustic radiation force impulse imaging
Frame rate considerations for real-time abdominal acoustic radiation force impulse imaging
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DOI：
10.1177/016173460602800401
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发表时间：
2006-10-01
影响因子：
2.3
通讯作者：
Trahey, Gregg E.
中科院分区：
文献类型：
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作者：
Fahey, Brian J.;Palmeri, Mark L.;Trahey, Gregg E.
随着实时声辐射力脉冲 (ARFI) 成像的出现，从临床角度来看，提高帧速率既是可取的，也是相关的。然而，与入射辐射力脉冲相关的热安全问题对帧速率造成了根本限制。腹部 ARFI 成像利用曲线扫描几何形状，产生与之前研究的线性阵列或机械平移凹面换能器明显不同的组织加热模式。有限元法 (FEM) 模型用于模拟这些组织加热模式，并分析组织加热对腹部 ARFI 成像可用帧速率的影响。实施灌注模型来考虑由于血流和帧速率限制造成的冷却效应，并在存在正常、减少和可忽略的组织灌注的情况下进行评估。传统的 ARFI 采集技术与采用并行接收跟踪的 ARFI 成像在热效率方面也进行了比较。此外，还获取了换能器表面温度增加的热电偶测量值，以评估成像阵列的累积加热所施加的帧速率限制。研究发现，利用现有的 ARFI 成像技术可以安全地实现足以满足许多腹部成像应用的帧速率。
With the advent of real-time Acoustic Radiation Force Impulse (ARFI) imaging, elevated frame rates are both desirable and relevant from a clinical perspective. However, fundamental limitations on frame rates are imposed by thermal safety concerns related to incident radiation force pulses. Abdominal ARFI imaging utilizes a curvilinear scanning geometry that results in markedly different tissue heating parterns than those previously studied for linear arrays or mechanically-translated concave transducers. Finite Element Method (FEM) models were used to simulate these tissue heating patterns and to analyze the impact of tissue heating on frame rates available for abdominal ARFI imaging. A perfusion model was implemented to account for cooling effects due to blood flow and frame rate limitations were evaluated in the presence of normal, reduced and negligible tissue perfusions. Conventional ARFI acquisition techniques were also compared to ARFI imaging with parallel receive tracking in terms of thermal efficiency. Additionally, thermocouple measurements of transducer face temperature increases were acquired to assess the frame rate limitations imposed by cumulative heating of the imaging array. Frame rates sufficient for many abdominal imaging applications were found to be safely achievable utilizing available ARFI imaging techniques.