Wikipedia
A sonographer, or ultrasonographer, is a healthcare professional, frequently a radiographer but may be any healthcare professional with the appropriate training, who specialise in the use of ultrasonic imaging devices to produce diagnostic images, scans, videos, or 3D volumes of anatomy and diagnostic data. The requirements for clinical practice vary greatly by country. Sonography requires specialized education and skills to view, analyze and modify the scan to optimize the information in the image. Because of the high levels of decisional latitude and diagnostic input, sonographers have a high degree of responsibility in the diagnostic process. Many countries require that medical sonographers have professional certification. Sonographers must understand ultrasound physics, cross sectional anatomy, physiology and pathology.
Usage examples of "sonographer".
The sonographer has a pleasant, professional air as she looks down at me.
The sonographer raises an eyebrow and squeezes some transparent gloop on my stomach.
The sonographer gave me this huge great lecture about how I could have done damage to myself or broken the machine, and we only managed to get away after Luke promised a big donation to the scanner appeal.