Ultrasound is defined as sound a frequency above the upper length of normal hearing (ULKHZ)
Ultrasound image are formed from the reflected sound waves(2.5-30 MHz ). Sound waves are generated in the bent by B-node the transduce (probe)Those sound waves are effected by interfaces of tissue c different physical properties and reflected electrons is used to generate the contrast of the different tissue to form a image.
USG generate realtime 2D image at a rate of 15-60 frames per second of both anatomy and a motion.
Heart and neck the probes of 7.5 MHz or generate are used.
USG produce diagnostic information a high degree of accuracy.
- Ultra sound allows a gold standard ability to determine whether a focal lesion is cystic solid even better than CT and MU.
- Ultrasound has no ionizing radiation, heater readily addible and relatively cheap.
- It plays an important role in guiding intervention procedure such as FNAC, biopsies, catheters accurately and in real time.
- It is very efficient in assessing
- lymphnode
- Thyroid glance
- Parathyroid: 1º hyperparathyroroidism
- Salivary glance: Tumour shows if > 2 mm.
- Cystic lesions : Thyroglossal Cyst, Branchial cyst
- Soft tissue neoplasm: Lipoma PGS
- Vascular malformation : haemangiomas
- Neurogenic malformation”: Neurofibroma
