Speckle Reduction Techniques for Ultrasound Images

Images of different body organs play very important role in medical diagnosis. Images can be taken by using different techniques like x-rays, gamma rays, ultrasound etc. Ultrasound images are widely used as a diagnosis tool because of its non invasive nature and low cost. The medical images which uses the principle of coherence suffers from speckle noise, which is multiplicative in nature. Ultrasound images are coherent images so speckle noise is inherited in ultrasound images which occur at the time of image acquisition. There are many factors which can degrade the quality of image but noise present in ultrasound image is a prime factor which can negatively affect result while autonomous machine perception. In this paper we will discuss types of noises and speckle reduction techniques. In the end, study about speckle reduction in ultrasound of various researchers will be compared.