The adult brain must be limited to which frequencies to enhance penetration?

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Multiple Choice

The adult brain must be limited to which frequencies to enhance penetration?

Explanation:
The key idea is how frequency affects how well waves get through the skull. The adult skull heavily attenuates and scatters ultrasound, and this attenuation grows with frequency. Lower frequencies pass through bone with less loss, so they reach deeper brain tissue more effectively. The trade-off is that lower frequencies sacrifice resolution and focusing ability, but for penetration into the brain, very low frequencies are favored.

The key idea is how frequency affects how well waves get through the skull. The adult skull heavily attenuates and scatters ultrasound, and this attenuation grows with frequency. Lower frequencies pass through bone with less loss, so they reach deeper brain tissue more effectively. The trade-off is that lower frequencies sacrifice resolution and focusing ability, but for penetration into the brain, very low frequencies are favored.

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