X-Ray risk from overexposure to radiation, danger and safety by Ray Sahelian, M.D. X-Ray Diagnosis

X-rays are a form of electromagnetic radiation with a wavelength in the range of 10 to 0.01 nanometers, corresponding to frequencies in the range 30 to 30 000 PHz (1015 hertz). X-rays are primarily used for diagnostic radiography and crystallography. X-rays are a form of ionizing radiation and as such have risks and can be dangerous.
 

X-Ray risk
Since x-rays are a type of radiation, people undergoing these tests are concerned that the radiation may increase their risk of cancer. It's true that overexposure to x-rays can damage or destroy living tissue. There is a concern that excessive exposure to x-rays can raise the risk for cancer.

Chest X-ray and Breast Cancer

Exposure to chest X-rays may increase the risk for breast cancer risk in mutation carriers. Studies have shown that young girls who receive repeated X-rays for assessment of scoliosis have an increased risk of breast cancer. Dr. David Goldgar of Case Western Reserve University in Cleveland, Ohio, and colleagues retrospectively evaluated 1601 women who were either BRCA1 or BRCA2 carriers and were exposed to routine, occasional and conventional chest X-rays for screening or diagnosis to assess risk of breast cancer. These women already have a high risk of breast cancer without the possible risk increase conveyed by chest X-rays. The IBCCS members found that any reported exposure to chest X-rays was associated with a hazard ratio (HR) of 1.54. Women 40 years old or younger had an even higher risk of breast cancer after chest X-ray exposure with an HR of 1.97. Women born after 1949 had an HR of 2.56. BRCA1/2 carriers exposed to chest X-rays before age 20 had the highest risk, with an HR of 4.64. Journal of Clinical Oncolology 2006;24:3361-3366.

Computed tomography (CT) coronary angiography raises breast cancer risk
A special type of X-ray used to diagnose heart disease may cause cancer in women and young adults. The procedure, called a computed tomography (CT) coronary angiography can see inside the heart and its arteries without invading the body. But it gives a high dose of radiation, enough to cause cancer in vulnerable people. The CT angiography is sometimes used in emergency rooms when someone comes in with chest pain and doctors need to assess quickly whether a heart attack is likely.

Patients are receiving the equivalent of 600 chest X-rays when they get CT scans for heart disease and not enough clinics are using known ways to reduce this exposure. While the potential risk of developing cancer after a cardiac CT scan is slight, at less than 1 percent, researchers in a large, international study found the radiation doses from such tests varied widely among hospitals, suggesting more can be done to minimize patients' exposure. Dr. Thomas Gerber of the Mayo Clinic in Jacksonville, Florida was a co-author in the study published in Jan 2009.
 

X-ray machine
An X-ray machine is used by radiologists to obtain an x-ray image. X-ray machines are used in various fields, mostly in medicine and security.

Excess radiation exposure
Younger Americans are being exposed to high amounts of radiation from medical scans that increase their risk of cancer. The cumulative risk of repeated exposure to radiation from medical scans is a public health threat that needs to be addressed. Dr. Reza Fazel of Emory University in Atlanta did a three-year study of nearly 1 million Americans aged 18 to 64. It reveals that as many as 4 million Americans a year are exposed high doses of radiation. The findings heap new pressure on imaging equipment makers such as General Electric Co, Siemens AG and Philips Electronics NV, already facing efforts in Congress to cut payments for imaging procedures as a way to find money to expand U.S. health insurance coverage. A report in March 2009 by the National Council on Radiation Protection and Measurement found that Americans are exposed to seven times more radiation from diagnostic scans than in 1980. The two biggest contributors to radiation exposure were an advanced kind of X-ray called a computed tomography or CT scan and nuclear medicine scans -- in which a small amount of radioactive material is injected into the bloodstream and read by special cameras. One of the nuclear medicine procedures, an advanced heart stress test called a myocardial perfusion scan, is the single-biggest contributor. "It was easily the procedure that accounted for the greatest proportion of the overall radiation exposure," Dr. Reza Fazel said. Most procedures were done in outpatient settings such as doctor's offices instead of a hospital. New England Journal of Medicine, August 27, 2009.

Questions received by email
I'm a flight attendant with a quick question. I routinely carry with me BHRT meds, bioidentical hormone replacement therapy, as well as vitamins which are placed through the X-ray machines at airports all over the world. Does this affect the efficacy of these pills and estrogen creams?
    I don't have any reason to believe the weak radiation would have any effect or cause any damage.