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phyrev ch.4 - Ch 9 Axial and Lateral Resolution Axial...

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Ch 9. Axial and Lateral Resolution Axial Resolution – to distinguish two structures that are close to each other front to back , parallel to or along the beam main axis. Only changed with new transducer, sonographer can’t change Also called, Longitudinal, axial, range, radial, depth = ½ SPL Is best in transducers with the highest frequency and the fewest numbers of cycles per pulse, Is worst in transducers with the lowest frequency and the largest number of cycles / pulse Lateral Resolution – minimum distance that 2 structures are separated by side-to-side , or perpendicular to the sound beam that produces 2 distinct echoes. Also called – lateral, angular, transverse, azimuthal Varies with depth, and is best at the focus or one near zone length because the sound beam is narrowest at that point. Equal to beam diameter . Wider reflections at depths further away from the focus exhibit poor lateral resolution. High frequency improves axial res. everywhere in the image and lateral res in the far field only. AXIAL – determined by pulse length, best with shortest pulse highest frequency and fewest cycles, does
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