[Clinical practice guideline for integrated PET/MRI in Alzheimer's disease (2026 edition)].

To further standardize the clinical use of integrated PET/MRI brain imaging for Alzheimer's disease (AD) in China, improve early identification and precision diagnosis and management of AD, promote standardized care, and provide evidence-based and consensus recommendations for clinicians and imaging professionals, experts in nuclear medicine, radiology, neurology, and related fields developed this guideline through a consensus process informed by the available research evidence and clinical practice. AD is one of the most common forms of dementia in older adults, with an insidious course; early diagnosis and timely intervention are crucial to improving patient outcomes. Integrated PET/MRI enables the simultaneous, one-stop acquisition of multidimensional information-including cerebral amyloid burden, brain metabolism, and high-resolution anatomical detail-and can be used for early diagnosis, clinical staging, assessment of disease progression, and clinical trial research, making it an important imaging tool for precision care in AD. As integrated PET/MRI systems become increasingly available in China, broader clinical implementation continues to face challenges, including appropriate patient selection and indications, standardization of scanning workflows, image quality control, consistency in image interpretation, and reporting standards. With a focus on clinical feasibility, this guideline provides recommendations across key domains-indications, examination and quality-control procedures, image interpretation, and standardized reporting-with the aim of promoting the standardized use of integrated PET/MRI in AD care and advancing research and translation of relevant imaging biomarkers.