E-Z-EM, Inc. was headquartered in New York and developed, manufactured and marketed diagnostic imaging products used by radiologists like the MRI bowel marker Gadolite® Oral Suspension.
In addition to medical diagnostics systems, the company's products included interventional devices, such as biopsy needles. E-Z-EM was also a third-party contract manufacturer of contrast media.

Bracco Diagnostics, Inc., the US-based subsidiary of Bracco Imaging S.p.A. and part of the Bracco Group, announced in Oct. 2007 that it has entered into a merger agreement to acquire E-Z-EM, Inc. (NASDAQ: EZEM). Bracco Imaging's portfolio offering has been broadened with completion of the acquisition in 2008.

The echo is the part of the transmitted ultrasound that is reflected back to the receiving transducer crystal.

See also Sonographic Features.

The echo location is the location of a target relative to the sensor face. The echo is located by measuring the time that it takes for a sound wave to travel to the target and be reflected back to the sensor.

See also Time of Flight.

Echo ranging is the ultrasound relationship between transit time and reflector depth expressed as:
t = 2d//c

Echocardiography is the ultrasound examination of the heart. Depending on the used ultrasound system, echocardiograms can be two-dimensional slices or 3D real-time images of the heart. Based on the ultrasound principles the direction and speed of blood flow can be utilized e.g., to diagnose a leaking or stenosed valve or to identify intracardiac shunts.

Different types of echocardiography:
The transthoracic echocardiogram (images are taken through the chest wall) is a non-invasive, highly accurate and quick assessment of the overall health of the heart.
A more invasive method is to insert a specialized scope containing an echocardiography transducer (TEE probe) into the esophagus, and record images from there. The advantages are clearer images, since the transducer is closer to the heart.
Contrast echocardiogram (CE) is already a valuable tool to delineate endocardial borders, direct invasive procedures, detect intracardiac shunts, assess myocardial perfusion and viability, and quantify coronary flow reserve and blood volumes (see also hemoglobin). The mechanism of microbubble CE is based on the physical principles of rarefaction and compression, leading to volume pulsations of microbubbles, and it is this change that results in CE signal.
Stress echocardiograms are echocardiography exams used for detection of coronary artery disease.

See also Diastole, Bicycle Stress Echocardiography, Resistive Index, and M-Mode Echocardiography.