Sometime in the past few million years, collapse at the top of the cave and surface erosion created the natural entrance of Carlsbad Cavern. This opened previously hidden underground cave passageways to the world above for the first time.
The Society of Diagnostic Medical Sonography (SDMS) defines sonography as diagnostic medical procedure that uses high frequency sound waves (ultrasound) to produce dynamic visual images of organs, tissues, or blood flow inside the body. This type of procedure is often referred to as a sonogram or ultrasound scan.
Ultrasound technicians, also known as diagnostic medical sonographers, operate machines called sonographic scanners that create images of patients' internal organs.Sonographers can work in physicians' offices, clinics or hospitals, and night and weekend shifts may be required.ltrasound technicians, also known as diagnostic medical sonographers, operate machines called sonographic scanners that create images of patients' internal organs.