Huge increase of cancer risk from overuse of CT scans and medical radiation

I have written about this issue of cancer risk from overuse of radiation and CT scanning several times in the last few years. This is an article by a cardiologist who notes that the use of medical radiation has increased by six times in the last 20 years. The radiation doses of CT scans are 100 to 1,000 times higher than conventional X-rays. A 2009 study from the National Cancer Institute estimates that CT scans conducted in 2007 will cause a projected 29,000 excess cancer cases and 14,500 excess deaths over the lifetime of those exposed. "Given the many scans performed over the last several years, a reasonable estimate of excess lifetime cancers would be in the hundreds of thousands." Has anyone had a CT scan that they thought was unnecessary?
http://www.nytimes.com/2014/01/31/opinion/we-are-giving-ourselves-cancer.html?_r=0