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In the diagnosis of patient disease states, physicians can select from an array of medical diagnostic modalities. A few of these involve the use of ionizing energy to create a medical image. If a physician is concerned about the use of ionizing radiation, he or she may choose to order any of the following diagnostic modalities EXCEPT:
a. Thermograms.
b. Medical sonography.
c. Radiography.
d. Magnetic resonance imaging.