Abstract

RTI is a method of imaging relative attenuation using a single, ideally strongly focused, transducer in pulse echo mode. RTI using a linear (ID) array has not previously been attempted but would have considerable practical advantages. Performance was assessed by imaging attenuating tiles set in a uniform scattering background. The average speckle to noise ratio was 5.6. For an attenuation contrast of -62%, the contrast to noise ratio was 4.4. The width of the 2D RTI edge step function was 2.2 by 2.4 mm /spl plusmn/ 0.6 mm. Such a spatial resolution should be adequate to image thermal lesions.. The phantom design provided a useful means of measuring performance and hence optimising scanner:settings for RTI.

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