A common concern now is how much radiation exposure occurs with common radiological testing such as x-rays and CT scans, especially given the small increased risk of cancer with accumulated exposure over years. Of note, ultrasounds and MRI scans do not emit radiation. MRI scans use magnets while ultrasounds use sound waves in order to obtain imaging information. So, here's a chart comparing such tests with common environmental radiation exposure such as sunlight. Information taken fro…