PET-MRI has the potential to detect and diagnose certain complex cancerous growths, including cancers of the neck, pelvis, and neck, with high level of accuracy and confidence. This technique allows doctors to provide better disease and treatment planning, therefore improving your care. The scan also allows the doctor to monitor how certain drugs are travelling in your body to determine how well they are working. With the use of PET-MRI, researchers are able to monitor stem cells (undifferentiated biological cells) as they are maturing and transforming into different types of body tissues.