ultrasonography

ULTRASONOGRAPHY It uses a very high frequency (3.5-10 MHz) pulsed echography send off which is directed in to the body from a transducer placed at a time in spot with the skin. It produces echoes, which ar converted in to signals and thence in to black,white and colourize visual echo insure icon ,which is displayed on the television.screen. It represents a topograohical map of the depth of the tissue interfaces. illusion DOPPLER This is a upstart advance which utilizes a change in the frequency of full reflected from a moving source to invent arterial and venous blood flow.The computer then adds the distinguish colour ,to the vascular structures in the visual echo picture image, making distinction among structures easy. ADVANTAGES Uses nonionising actinotherapy,so there is decreased radiation dose. Non invasive ,easily available and brassy Images show good differentiation between soft tissues and are very sensitive for evaluation of salivary gland disease. DISADVANTAGES It has particular use in the head and sleep together area as the sound waves are not draped by the bone.Its use is restricted to yhe superficiakl structures. Technique is opereator dependent Images can be difficult to interpret for inexperienced operators as the image blockage is poor.

APPLICATIONS Evaluation of the swelling of the head and neck-lymph nodes,thyroid and salivary gland. It is used as a diagnostic modality for salivary gland ultrasonography in children to avoid the radiation effects of CT and in adults with allergy to contrast agents. It is the investigation of choice to diffrenciate between trustworthy and cy stic lesions. Determination of the relation! ship of vascular structures to masses with the alliance of COLOR DOPPLER imaging. Detection of salivary gland and duct calculi. RADIONUCLEIDE resource It requires the wasting disease /injection of specific radioactive materials such as isotopes with unfit nuclei which undergo radioactive...If you want to get a full essay, position it on our website: OrderEssay.net

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