کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1761070 | 1019632 | 2012 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Intracellular Growth of Nanoscale Perfluorocarbon Droplets for Enhanced Ultrasound-Induced Phase-Change Conversion
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
آکوستیک و فرا صوت
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![عکس صفحه اول مقاله: Intracellular Growth of Nanoscale Perfluorocarbon Droplets for Enhanced Ultrasound-Induced Phase-Change Conversion Intracellular Growth of Nanoscale Perfluorocarbon Droplets for Enhanced Ultrasound-Induced Phase-Change Conversion](/preview/png/1761070.png)
چکیده انگلیسی
Perfluorocarbon (PFC) nanodroplets (NDs) have been proposed as phase-change contrast agents for ultrasound imaging. Since the ultrasound energy required to convert PFC droplets to microbubbles is inversely related to size, the conversion of PFC NDs at clinically-relevant pressures is challenging. We propose that if PFC NDs can accumulate in a close-packed configuration and grow in size in situ, phase-change conversion can occur at lower ultrasound pressures compared with isolated NDs. In this article, we show that PFC NDs can be designed to grow in size after loading in cells, from 0.26 ± 0.09 μm to 1.7 ± 0.6 μm after 2 h. This growth allowed for a substantial decrease in the ultrasound conversion threshold (to 1.4 MPa and 4.8 MPa at 1 MHz and 18 MHz, respectively), whereas non-coalesced NDs in cells and NDs alone were not converted up to the maximum applied pressure (2.1 MPa and 6.3 MPa at 1 MHz and 18 MHz, respectively). These results indicate that PFC NDs with conversion pressures too high for diagnostically feasible conversion can be used as phase-change agents if they can be induced to grow in size in situ.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ultrasound in Medicine & Biology - Volume 38, Issue 10, October 2012, Pages 1799-1810
Journal: Ultrasound in Medicine & Biology - Volume 38, Issue 10, October 2012, Pages 1799-1810
نویسندگان
Amanda L. Martin, Minseok Seo, Ross Williams, Grace Belayneh, F. Stuart Foster, Naomi Matsuura,