Transcranial application of focused ultrasound (FUS) combined with vascular introduction of microbubble contrast agents (MBs) has emerged as a non-invasive technique that can temporarily create a localized opening in the blood–brain barrier (BBB). Under image-guidance, we administered FUS to sheep brain after intravenous injection of microbubbles. BBB opening was confirmed by performing dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) to detect the extravasated gadolinium-based magnetic resonance contrast agents. Through pharmacokinetic analysis as well as independent component analysis of the DCE-MRI data, we observed localized enhancement in BBB permeability at the area that subjected to acoustic pressure of 0.48 MPa (mechanical index = 0.96). On the other hand, application of a higher pressure at 0.58 MPa resulted in localized, minor cerebral hemorrhage. No animals exhibited abnormal behavior during the post-FUS survival periods up to 2 mo. Our data suggest that monitoring for excessive BBB disruption is important for safe translation of the method to humans.
|Number of pages||14|
|Journal||Ultrasound in Medicine and Biology|
|Publication status||Published - 2019 Sept|
Bibliographical noteFunding Information:
This study was supported by the National Institutes of Health ( R01 MH111763 to S.S.Y.). We acknowledge Dr. Yongzhi Zhang for supporting tissue extraction, Ms. Linda B. Xu for editorial support and Dr. Christine G. Lian for her contribution to histologic analysis. We thank the Dana–Farber/Harvard Cancer Center in Boston, Massachusetts, for use of the Specialized Histopathology Core, which provided histology and immunohistochemistry service. The Dana–Farber/Harvard Cancer Center is supported in part by National Cancer Institute Cancer Center Support Grant P30 CA06516 .
© 2019 World Federation for Ultrasound in Medicine & Biology
All Science Journal Classification (ASJC) codes
- Radiological and Ultrasound Technology
- Acoustics and Ultrasonics