Amphetamine Use Disorder

The goal of this clinical trial is to investigate the safety and efficacy of applying low-intensity focused ultrasound targeting the nucleus accumbens in individuals with opioid or amphetamine use disorders. The main questions it aims to answer is: \- Low-intensity focused ultrasound targeting the nucleus accumbens demonstrates sufficient safety and predictable therapeutic efficacy in individuals with opioid or amphetamine use disorders. Participants will: * Received Low-intensity focused ultrasound neuromodulation once * Visit the clinic for checkups and asessment at 1 week, 1 month, 3 months, 6 months, 9 months, 1 year, 1.5 years, and 2 years after received Low-intensity focused ultrasound neuromodulation.

Amphetamine Use Disorder (AUD) is a major public health issue in Taiwan, where it is the most commonly abused illegal drug. There are currently no effective approved medications to treat it, which makes finding new treatment options urgent. Repetitive Transcranial Magnetic Stimulation (rTMS), a non-invasive brain stimulation method, has shown promise in reducing cravings and drug use in people with addiction, but its effects on AUD are not well studied. To explore this, the investigators plan to conduct a double-blind, sham-controlled study with 20 people diagnosed with AUD. Half will receive real rTMS treatment, and half will receive a placebo-like sham treatment. The treatment targets a specific brain area (the left dorsolateral prefrontal cortex) and will be given 10 times over two weeks. The investigators will assess the effectiveness of rTMS by tracking drug cravings, urine test results, and side effects with follow-up over 12 weeks. The investigators also include brain imaging using near-infrared spectroscopy (NIRS) after the treatment. The study aims to better understand how rTMS might help reduce amphetamine cravings and improve outcomes, potentially leading to new treatment options for AUD.

During the first funding period (1st FP), the investigators developed a novel full Pavlovian-to-instrumental transfer (PIT) task that allows assessing both, general and specific PIT to investigate whether specific PIT differs between alcohol use disorder (AUD) and control subjects. Preliminary analyses of the full transfer task indicate that AUD participants exhibit a stronger specific PIT effect compared to controls. Based on these findings, the investigators want to compare specific and general PIT effects in patients with moderate to severe substance use disorders (alcohol, cannabis, methamphetamine, amphetamine and cocaine) to healthy controls on the behavioral and neural level (fMRI).