A randomized trial published April 24 in JAMA suggests patients with lower-extremity peripheral artery disease (PAD) can’t be expected to improve walking performance on their own, even with the aid of wearable activity trackers and telephone coaching sessions.

Cocaine addiction can ruin a person physically and financially, and with an estimated 1.4 million cocaine users in the U.S., thousands will become trapped by their habit. While previous research on the drug and its addictive potential were observational and subjective, imaging is reshaping how we see addiction—and how it will be treated.

PET with 11C-PIB provides a noninvasive method for visualizing amyloid deposits in the heart, according to a study published in the February issue of the Journal of Nuclear Medicine. The researchers suggest that 11C-PIB eventually may be used in the clinical setting as both a diagnostic tool and a treatment follow-up method.