Imaging tests are also used to screen for and detect colorectal cancer. These tests use technologies that visualize your body organs and present them like a picture. Imaging tests are also used to determine how far the cancer has spread or how well it is responding, or has responded, to treatment. While some tests still use X-rays, newer technologies use radioactivity (in very tiny doses), ultrasound, or magnetic fields to obtain the pictures.
The imaging test for the initial detection of colorectal cancer is virtual colonoscopy.
When you're the Queen Mum of heavy metal's royal family, everything's a bit different -- even cancer. "I had a whole team of people to take me to and from chemotherapy, to cook for me, to do everything for me," recalls Sharon Osbourne, wife of metal madman Ozzy Osbourne, of her bout with colon cancer in 2002.
Osbourne, 59, now a host of The Talk on CBS and a judge on NBC's America's Got Talent, will celebrate 10 years of being cancer-free this year, but she still remembers the rigors. "The stuff...
New technology has made it possible for a computer to take CT images of the colon and reconstruct a three-dimensional model of your colon. The inside of this model can be inspected, without causing any pain to you, to search for abnormalities. The test involves enlargement or distension of the colon with air. Early results show promise for screening the colon and detecting small polyps or asymptomatic colorectal cancers.
The main disadvantage of virtual colonoscopy is that any abnormalities have to be evaluated and treated by real-time colonoscopy. However, it is likely to have a place in screening for colorectal cancer.