Advanced Imaging

Panoramic Imaging Since the near-field image width limited by width of transducer, difficult to obtain a wide view of shallow structures 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 image.

Spatial Compound Imaging 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

Elastography 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 monitor

Anistropy 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