Hello, and good question! The short answer is that your risk of getting cancer from the radiation you received from your tests is VERY low - but not zero. If you are having health issues requiring the tests, you should not at all be worried about receiving the tests, because the benefits of figuring out what is going on is MUCH greater than your cancer risk.Up front, I should also mention that neither MRIs or ultrasounds have any ionizing radiation in them, and therefore do not cause any cancers.X-rays and CT-scans do give the patients who receive them some radiation, however the dose is typically quite low. How low depends upon where you are scanning and how many scans you've had done. The doses used to quantify the radiation an individual receives can be a bit confusing, but the best measure to use when considering that risk of getting a cancer secondary to the radiation is the "effective dose" which is measured in Sieverts - or milliSieverts (mSv = 1/1000 of a Sv). The best estimates of cancer risk from radiation is estimated to be abotu 4-5% per Sievert received.To put this in perspective, a typical chest X-ray results in an effective dose of about 0.1mSv while an abdominal CT is considered to give "a lot" of radiation or about 8-10mSv. Using the risk estimate of 4-5%/Sv, this means a CXR increases your risk of getting cancer by 0.000 5% (5 per million) and an abdo CT increases the risk by 0.05% - or 5 per 10000. A few more important points bear mentioning:1. Overall an individuals baseline risk of developing cancer (i.e. the risk everyone has just by being alive) is much greater than that due to any radiation received from x-rays. (And the risk of cancer from smoking is so much greater than any you get from radiation: ~1% of cancers are caused by radiation exposure, whereas ~40% of cancers are cause by smoking.)2. For those who get cancers from radiation exposure, these take at LEAST 10 years to form and typically develop 15-30 years after.3. The risk of developing cancer following radiation also depends upon the age when the radiation/x-rays were received. The risk is highest in individuals who receive radiation as children, with moderate risks for those in early adulthood. The risks are negligible for those over 50 years. To put this in perspective, though, in the higest risk cases whereby children ~10years old receive radiation to treat cancer we typically treat to doses 2000x that which you receive with a CT scan. This is thought to cause a lifetime risk of cancers in the neighbourhood of 10-20%. In your case, you are an adult and the doses you receive with your diagnostic tests are much smaller, so your risk is almost negligible.I hope that this helps.