18F-fluorodeoxyglucose positron emission tomography/computed tomography as an adjunctive tool in the diagnosis of brain death/death by neurologic criteria (BD/DNC) with abnormal spinal reflexes: a series of case descriptions - Cui, Ke; Geng, Caizheng; Yang, Chunyan; Zhao, Weili; Di, Haibo; Laureys, Steven; Xu, Yinghe; Wu, Gang (Quantitative Imaging in Medicine and Surgery, 2025)