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Advanced Imaging
 Since the near-field image width limited by width of
transducer, difficult to obtain a wide view of shallow
 Transducer moved along patient's anatomy
 Multiple images blended to form single long image with
wide field of view
 Uses cross-correlation techniques to compare consecutive
images, rotating and stitching them together to form final
Spatial Compound
 Combines multiple lines of sight
 Sound beam steered to set of predetermined angles, typically within 20
degrees from perpendicular.
 Form single composite image at real-time frame rates.
 Benefits
 Reduction of angle-dependent artifacts
 Improved image quality through reduced speckle
 A method to assess the mechanical properties of tissue
 Stress applied to tissue
 Displacement measured using ultrasound
 Strain (compression)
 Most common technique
 Allows real-time visualisation of elastographic map on
 Effect that makes a tendon appear
 bright when it runs 90o to sound beam
 dark when the angle is changed.
 At very smooth boundaries, angle of reflection &
incidence equal
 Similar to mirror
 Probe only receives reflected sound if beam strikes
surface at 90o