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Your cancer, your life - methods for indirectly visualising internal organs not involving radiation YOUR CANCER, YOUR LIFE - METHODS FOR INDIRECTLY VISUALISING INTERNAL ORGANS NOT INVOLVING RADIATION
I'm sure you've heard of the depth-finders that ships use. These instruments send out a beam of ultrasound waves. By measuring how^otig these waves take to bounce back from the ocean floor, the depth at that point can be worked out. Ultrasound waves are not electromagnetic. They are the same as sound waves but of a frequency and wavelength that the human ear cannot pick up. They bounce back off some surfaces just as sound waves bounce back as echoes from cliffs.
Ultrasound can be used in medical diagnosis, because it bounces off some tissues in the body more readily than others and passes through different body tissues at different speeds. A machine that produces ultrasound waves is placed on the skin overlying the part of the body to be checked. The 'picture' formed by the waves echoing back can be 'read' by experienced people, but is not as clear as those of X-rays and scans. This method was developed originally for pregnant women because of the great importance of avoiding radiation to the delicate foetus. It is now used for many other purposes. Because it doesn't involve any radiation it is especially useful when repeated examinations are needed, for example, to check the effects of treatment on a growth. However, it can only be used on certain parts of the body and only shows up certain types of abnormalities clearly. Ask your doctor if you want to know more about its possible use in your particular case—it may or may not be suitable and/or available.
Thermography is a means of getting a 'picture' of various parts of the body by measuring the amount of heat coming off. For example, a thermographic picture of the breast might show excessive heat coming from a known lump. This would mean the lump was unlikely to be a fluid-filled cyst and more likely to be cancer or an abscess. This method is not very reliable because many factors can influence the amount of heat coming off different parts of the body.
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