Polyvinyl Alcohol Cryogels for Acoustic Characterization of Phase-Change Contrast Agents.

Polyvinyl Alcohol Cryogels for Acoustic Characterization of Phase-Change Contrast Agents.
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DOI:
10.1016/j.ultrasmedbio.2022.01.007
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发表时间:
2022-05
影响因子:
2.9
通讯作者:
Dayton, Paul A.
Dayton, Paul A.
中科院分区:
医学3区
文献类型:
--
作者:
Durham, Phillip G.;Kim, Jinwook;Eltz, Katherine M.;Caskey, Charles F.;Dayton, Paul A.

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由脂质封装的低沸点全氟化碳组成的相变造影剂(pcca)可与超声结合使用,用于诊断和治疗。pcca的一个好处是部位特异性激活,即液体核心在声学上汽化成可通过超声成像检测到的气泡。为了进一步评估pcca在各种应用中的应用,将这些纳米液滴分散到声学相容的固定基质中是有用的。然而,许多传统的幻影制剂需要加热,这导致低沸点pcca过早热激活。聚乙烯醇(PVA)冰箱不需要加热即可定型。在这里,我们提出了一种简单的方法,利用八氟丙烷(OFP)和十氟丁烷(DFB)将低沸点pcca掺入PVA冷冻机中,用于各种声学表征应用。然后,我们通过聚焦换能器激活液滴,用超声成像可视化病变,来演示幻影的效用。在1 MHz下,OFP和DFB分别在2.0 MPa和4.0 MPa下观察到一致的液滴活化。
Phase-change contrast agents (PCCAs) consisting of lipid-encapsulated low-boiling point perfluorocarbons can be used in conjunction with ultrasound for diagnostic and therapeutic applications. One benefit of PCCAs is site-specific activation, whereby the liquid core is acoustically vaporized into a bubble detectable via ultrasound imaging. For further evaluation of PCCAs in a variety of applications, it is useful to disperse these nanodroplets into an acoustically compatible stationary matrix. However, many traditional phantom preparations require heating, which causes premature thermal activation of low-boiling point PCCAs. Polyvinyl alcohol (PVA) cryogels do not require heat to set. Here we propose a simple method for the incorporation of the low-boiling point PCCAs utilizing octafluoropropane (OFP) and decafluorbutane (DFB) into PVA cryogels for a variety of acoustic characterization applications. We then demonstrate the utility of the phantoms by activating droplets with a focused transducer, visualizing the lesions with ultrasound imaging. At 1 MHz, consistent droplet activation was consistently observed at 2.0 MPa and 4.0 MPa for OFP and DFB respectively.
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