Editing Medical ultrasound (section)

==Advantages and drawbacks==
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Compared to other medical imaging modalities, ultrasound has several advantages. It provides images in real-time, is [[Portable ultrasound|portable]], and can consequently be brought to the bedside. It is substantially lower in cost than other imaging strategies. Drawbacks include various limits on its field of view, the need for patient cooperation, dependence on patient physique, difficulty imaging structures obscured by [[bone]], air or gases,<ref group="note">It is for this reason that the person subjected to ultrasound of organs that can contain quantities of air or gas, such as the stomach, intestine and bladder, must follow a food preparation designed to reduce their quantity: specific diet and supplements for the intestine and intake of non-carbonated water to fill the bladder; sometimes, during the examination, it may be required to fill the stomach with non-carbonated water.</ref> and the necessity of a skilled operator, usually with professional training.