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In this March 23, 2017 photo provided by the Sunnybrook Health Sciences Centre, patient Rick Karr is prepared for treatment at the facility in Toronto, Canada. Karr was the first Alzheimer's patient treated with focused ultrasound to open the blood-brain barrier. Scientists are using ultrasound waves to temporarily jiggle an opening in the brain’s protective shield, in hopes the technique one day might help drugs for Alzheimer’s, brain tumors and other diseases better reach their target. (Kevin Van Paassen/Sunnybrook Health Sciences Centre via AP)

In this March 23, 2017 photo provided by the Sunnybrook Health Sciences Centre, patient Rick Karr is prepared for treatment at the facility in Toronto, Canada. Karr was the first Alzheimer's patient treated with focused ultrasound to open the blood-brain barrier. Scientists are using ultrasound waves to temporarily jiggle an opening in the brain’s protective shield, in hopes the technique one day might help drugs for Alzheimer’s, brain tumors and other diseases better reach their target. (Kevin Van Paassen/Sunnybrook Health Sciences Centre via AP)

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