Abstract
High intensity focused ultrasound was employed to modify the permeability of the normal feline and canine blood-brain barrier (BBB) to a circulating vial dye — Evans blue (EB). The threshold doses (W sec/cm2) for focally increasing the permeability of the BBB in white matter (WM) and gray matter (GM) were as follows: internal capsule (WM) — 340 to 680; thalamus (GM) — approximately 1326; and caudate nucleus (GM) — 2284 to 2952. In the presence of supralesioning doses of ultrasound, the cross sectional area occupied by the EB was consistently greater than that of the attendant nonhemorrhagic lesion — thus suggesting that BBB changes may be inducible at sublesioning doses. These findings, in conjunction with those of others, suggest that high intensity focused ultrasound may have a role in the treatment of brain tumors based on cell destruction by two mechanisms: (a) direct, by the ultrasound and (b) indirect, by ari antineoplastic agent which is delivered via an ultrasonically modified BBB.
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© 1990 Plenum Press, New York
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Patrick, J.T. et al. (1990). Ultrasound and the Blood-Brain Barrier. In: Bicher, H.I., McLaren, J.R., Pigliucci, G.M. (eds) Consensus on Hyperthermia for the 1990s. Advances in Experimental Medicine and Biology, vol 267. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-5766-7_36
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DOI: https://doi.org/10.1007/978-1-4684-5766-7_36
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