It has just recently been discovered that CT scans for children have been inappropriately used in two Ontario hospitals. As a result, some children have received excessive doses of radiation, putting them at greater risk of developing cancer later in life.

Staff at the two hospitals -- Peterborough Regional Health Centre is one -- reported that in close to 50 percent of selected cases, the appropriate equipment settings were not used.

Herein lies the problem -- developing organs are more susceptible to damage, and giving a small child an adult dose of radiation in a CT scan delivers the same amount of radiation as 4,000 traditional X-rays. Research shows that increased exposure to radiation over time can cause radiation-induced cancer.

CT scans are valuable diagnostic tools because they create 3-D images of organs, offering a better view of head injuries, chest trauma, cancer, and fractures. So they should not be disregarded -- but clearly, hospitals need to improve the management of all scanning procedures.

In Ontario, a diagnostic image safety committee has already been formed. The goal of this committee is to develop standards and do a better job of tracking radiation levels.

Experts are encouraging Ontario parents to refrain from worry unless their children have received many CT scans. And all parents are encouraged to speak up before their children receive CT scans. "Is my child receiving a pediatric protocol?" is all it takes.

Virtual colonoscopies, using a three-dimensional computed tomography colonography, is a non-invasive procedure for colorectal cancer screening and as accurate as the traditional very invasive procedure, according to the conclusion of a study conducted by University of Wisconsin researchers.

"Virtual colonoscopy produces precise and detailed 3-D fly-through images of the entire colon's interior without having to insert a scope -- there is essentially no risk of bleeding or of perforating the colon," stated Dr. Perry J. Pickhardt.

Virtual colonoscopies take an estimated ten minutes to perform, as the patient passes through a scanning machine. The researchers suggest that this new way of testing might bring more reluctant patients -- who avoid the invasive and uncomfortable colonoscopies available now -- in to be screened. Oh, ya think? Virtual colonoscopy is the screening test I would choose. Who wouldn't? Of course, if polyps or cancers are found, they must be removed by optical colonoscopy.

I cannot imagine anyone who would forego a colonoscopy if they can be offered the virtual colonoscopy screening. I certainly hope this becomes a standard in every part of the country.

To learn more about virtual colonoscopies, visit Viatronix.