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Some exams may use different transducers (with different capabilities) during a single exam.

The transducer sends out high-frequency sound waves (that the human ear cannot hear) into the body and then listens for the returning echoes from the tissues in the body.

High-frequency sound waves are transmitted from the probe through the gel into the body.

The transducer collects the sounds that bounce back and a computer then uses those sound waves to create an image.

The principles are similar to sonar used by boats and submarines.

The ultrasound image is immediately visible on a video display screen that looks like a computer or television monitor.

A computer collects and processes the sounds and creates graphs or color pictures that represent the flow of blood through the blood vessels.

For most ultrasound exams, you will be positioned lying face-up on an examination table that can be tilted or moved.The image is created based on the amplitude (loudness), frequency (pitch) and time it takes for the ultrasound signal to return from the area within the patient that is being examined to the transducer (the device placed on the patient's skin to send and receive the returning sound waves), as well as the type of body structure and composition of body tissue through which the sound travels.A small amount of gel is put on the skin to allow the sound waves to travel from the transducer to the examined area within the body and then back again.Ultrasound examinations do not use ionizing radiation (as used in x-rays), thus there is no radiation exposure to the patient.Because ultrasound images are captured in real-time, they can show the structure and movement of the body's internal organs, as well as blood flowing through blood vessels.Ultrasound scanners consist of a console containing a computer and electronics, a video display screen and a transducer that is used to do the scanning.

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