Which of the diagnostic modalities listed below does not employ the use of ionizing radiation?

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Magnetic resonance imaging (MRI)is an imaging modality using powerful magnetic and radiofrequency waves to reproduce cross-sectional images of the human body without exposing the patient to ionizing radiation.CT scans are radiographic studies that visualize structures by producing serial sections,many times clinically referred to as "cuts," through planes of the head and neck.Two types of audiometric testing,pure tone and speech audiometry,are performed on patients with suspected hearing loss.

Which of the Diagnostic Modalities Listed Below Does Not Employ