When the Texas and New Orleans and Angelina and Neches River railroads were built around the turn of the century, other new towns sprang into life, including Garrison and Appleby. The construction of the railroads also spurred the development of the lumber industry, which emerged at the end of the nineteenth century as one of Nacogdoches County's most important industries.
Echo technicians are ultrasound technicians who have specialized in using echocardiogram technology to produce images of patient's hearts. This field requires an associate's degree in medical sonography, and further specialization within the field is possible.
An echocardiogram (echo) is a test that uses high frequency sound waves (ultrasound) to make pictures of your heart. The test is also called echocardiography or diagnostic cardiac ultrasound. Quick facts.1  An echo uses sound waves to create pictures of your heartâs chambers, valves, walls and the blood vessels (aorta, arteries, veins) attached to your heart. 2  A probe called a transducer is passed over your chest.uick facts. 1  An echo uses sound waves to create pictures of your heartâs chambers, valves, walls and the blood vessels (aorta, arteries, veins) attached to your heart. 2  A probe called a transducer is passed over your chest.