Is a CT Scan an Ethical Issue?

All third-year students at Texas A&M are required to attend Saturday-morning radiology lectures, and I was surprised to hear my professor speak for the final 30 minutes yesterday on when not to order imaging.   Radiology is his life’s calling, but he recognizes that imaging studies like the CT scan can be harmful.  Of the $2.3 trillion spent on healthcare in the U.S., the largest share is spent on imaging, totaling $800 million.  CT scans have become a part of the American vernacular, but it is estimated that 1/3 of them are unnecessary.  What ethical issues concern the use of imaging in healthcare?

  • Patient Safety: Concerning chest scans, an X-Ray exposes the patient to 0.1-0.2 mSv of radiation, but the CT dose is 8.0 mSv.  At 50 mSv a person is at increased risk of cancer, so minimizing the number of exposures to a CT scan should be an important goal in healthcare.
  • Cost: Some of the ballooning in healthcare costs over the last decade is due to tests ordered by physicians.  Many doctors order tests not because they are indicated by the patient’s symptoms but because they serve as an extra layer of protection in the case of a lawsuit.  The irony of such defensive medicine is that one day a doctor may find himself in court for exposing the patient to too much radiation.  Patients never see the thousands of dollars of imaging charges, so they often authorize such studies and let the insurance companies handle the rest.
  • Physicians Lining Their Pockets: Research has shown that physicians increase the number of scans ordered when they are able to bill for the use of their own equipment.  One gastroenterologist related to me how his clinic moves a number of unnecessary endoscopies through his office for various reasons.  An endoscopy does entail some risk and is certainly not comfortable, but every CT scan is sure to expose the patient to radiation.  Physicians should refrain from allowing revenue strategies to trump good medical practice.

For more information on radiology, visit www.radiologyinfo.org.

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