<b>Ultrasound Scans</b>
which bounce sound waves off structures, seem to work best in picturing cystic type structures.  Those are things that are like water balloons, skins filled with fluid or homogeneous tissue.  

Ultrasound is good for imaging uterus and ovaries, kidneys, liver, spleen, and cardiac structures.  It is inexpensive, and free of radiation exposure.  It can be better than CT at picking up pelvic lesions.  It can pick up LMS lesions that are embedded in muscle.  As a cardiac echo exam it can be used to calculate an ejection fraction before, during, and after doxorubicin or other anthracycline chemotherapy treatment.  

Ultrasound is interactive. While doing the scan, if the technician is uncertain about an element in the image, the probe or the patient can be repositioned, or displacement pressure can be provided, to provide a more definitive image.

It is not good for visualization of the lung.

NIH/Medline Site
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Information on Imaging of the body
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