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There are numerous drugs that can be abused including tobacco, alcohol, marijuana, opiates, stimulants, sedatives, and hallucinogens. However, opiates have become a major problem in the United States in the past 10 to 15 years.
Respiratory syncytial virus (RSV) is the leading cause of lower respiratory infections in infants and children. Most reported cases of bronchiolitis and pneumonia in the pediatric population can be attributed to RSV. According to the Centers for Disease Control (CDC), nearly 100% of children in childcare contract the virus within the first two years of life.
Since its introduction to clinical imaging nearly two decades ago, magnetic resonance imaging (MRI) has radically modified the practice of medicine in general and radiology in particular.
T1 is the longitudinal relaxation time. T1 is the longitudinal relaxation time. It indicates the time required for a substance to become magnetized after first being placed in a magnetic field or, alternatively, the time required to regain longitudinal magnetization following an RF pulse.