Abstract: Metabolic imaging with ¹⁸F-fluorine-2-deoxy-D-gluc (¹⁸F-FDG) has unique clinical application value in the investigation and diagnosis for clinical oncology、myocardial viability and some central nervous system disorders. The standardized uptake value is regularly used as analyzing way of demi-quantuative. It reflects indirectly constitution glucose metabolic rate, and it is also convenient and quick.But, because it may be affected by many factors such as body height, body weight, blood sugar and insulin level, and the image time after injection FDG, layout to regional of interest et al, it is very important that the standardized to SUV assay be payed attention in the process of clinical application.