It is the radiologist's role to know some of the normal and abnormal findings of gastric band positioning. Radiologists should know what next study to do and why.  

Obesity has become a major medical problem throughout the world. Approximately 400 million people are obese, and about 1.6 billion are overweight. A study performed in the United States in 2005–2006 showed that approximately 1/3 of the population was obese.

Body mass index (BMI) is used to determine obesity by estimating body fat as a calculation of height and weight (kg/m²). A BMI of <18.5 is considered underweight, 18.5–24.9 is normal, 25.0–29.9 is overweight, and ≥30 is obese.