Abstract:
Ultrasound imaging is a widely used medical tool that can help physician evaluate
,diagnose and treat medical conditions and, due to its noninvasive nature, low cost
and capability of forming real time imaging it is widely used technique and
considered very safe due to non ionizing radiation properties unlike X-ray .the
ultrasound image shows granular appearance called speckle ,this noise decrease the
human ability to identify pathological from normal tissue because it depends on the
structure of the image tissue and various imaging parameters. The main purpose
for speckle reduction in medical ultrasound imaging to improve the human into
keep in mind that certain speckle contains diagnostic information and should be
retained.
The objective of this thesis is to give an overview about types of speckle reduction
techniques in ultrasound imaging and to present tow new techniques of speckle
reduction. And to carry out comparative evaluation of despeckle filtering based on
image quality evaluation metrics.
A new speckle suppression methods and coherence enhancement of medical
ultrasound images where proposed: The first one is modified of hybrid median
filter, the second one is combining of SRAD with hybrid median filter.
It has been found that quality evaluation metrics the proposed methods performed
better than all other methods while the structural details and results preserved
edges and features in a better way than other despeckling filters