Physics

Synopsis: Focusing Ultrasound with Holographic Lenses  

July 10, 2019

3D-printed acoustic lenses can enhance the efficiency of ultrasound beams concentrating on the mind by correcting for the impact of the cranium.

Synopsis figure

S. Jiménez-Gambín et al., Phys. Rev. Utilized (2019)

Concentrating on the mind with targeted ultrasound might improve drug therapies by quickly opening the blood-brain barrier. It may be a approach to modulate mind exercise noninvasively, doubtlessly treating pathologies of the central nervous system corresponding to Parkinson’s illness. Each of those functions require ultrasound power to be targeted exactly onto focused mind constructions, however that is made tough by the distortion produced by the cranium. Addressing this problem, Sergio Jiménez-Gambín and colleagues on the Technical College of Valencia in Spain devised a 3D-printed acoustic lens that compensates for the aberration by shaping an ultrasound beam earlier than it reaches the pinnacle.

The workforce created a pc mannequin that included the detailed anatomy of the mind and the form and acoustic properties of the cranium. They then attacked the issue within the reverse time course by simulating ultrasound sources contained in the mind and calculating the lens designs that will flip the disordered part of the exiting sound waves into coherent beams. Within the ahead time course, the identical lenses represent acoustic holograms, distorting incoming planar beams by the mandatory quantity to supply the specified sound “picture” contained in the mind.

To check the strategy, Jiménez-Gambín and colleagues used their simulations to 3D print plastic lenses with textured surfaces constituted of stacks of little columns. The workforce directed an ultrasound beam by every lens and measured the ensuing sound discipline inside a phantom, or mannequin head, whose cranium form matched their pc mannequin. In a scientific setting, the method could possibly be used to create lenses shortly and cheaply for particular person sufferers. Docs would first characterize an individual’s cranium form with CT and MRI scans after which 3D print the acoustic lens that yields the required ultrasound distribution.

This analysis is printed in Bodily Evaluate Utilized.

–Marric Stephens

Marric Stephens is a contract science author primarily based in Bristol, UK.

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