Wouldn't it be great if we could receive full-body scans every year to check for early signs of cancer and other disease? Even if possible and affordable -- right now, scans cost about $900 -- it still wouldn't be such a great idea.

Full-body scans often result in false alarms. People with harmless abnormalities may end up facing more tests, more risks, and more worry in order to rule out illness. The scan itself can present health hazards too. It exposes patients to more radiation than a chest X-ray and could slightly increase the risk of cancer, especially for those scanned every year.

How do we know, then, if something has gone awry in our bodies? Well, we can do our self-exams -- breast exams, testicular exams, skin exams -- and we can report for annual check-ups. We can respond to symptoms we experience -- if headaches are bothersome and persistent, your doctor may prescribe a head scan -- and we can pursue tests and screening that we really need for cancer prevention and early detection. Here are just a few:

Ovarian cancer is hard to detect and is usually found in the advanced stages. It is the most deadly of all gynecological cancers. Transvaginal sonography (TVS) screening has been associated with detecting ovarian cancer at earlier stages of the disease.

TVS is a procedure used to examine the vagina, uterus, fallopian tubes, ovaries, and bladder. An instrument is inserted into the vagina that causes sound waves to bounce off organs inside the pelvis. These sound waves create echoes that are sent to a computer, which creates a picture called a sonogram. The test is also known as a transvaginal ultrasound.

The researchers' findings appear in the May issue of Cancer. In the study, colleagues assessed the value of annual TVS screenings in over 25,000 women. Participants had to be at least 50 years of age with no cancer symptoms or at least 25 years of age with a family history of ovarian cancer.