Deformation measurement of liquid-filled elastic tube embedded in soft material using optimal pulse width method under photoacoustic excitation

[摘要] To pursue higher precision and wider range of noninvasive vascular deformation measurement for medical diagnosis, this paper presents a photoacoustic measurement method based on the acoustic resonance perspective other than usual imaging-based method. In-vitro experiments were conducted for red-ink-filled soft tubes having diameter of less than 1mm embedded in a tissue-mimicking phantom. A 3-W laser diode and a 2-MHz ultrasound transducer together with an external compressing device were used. Percentage error of 4% was marked in estimating the inner diameter of tube samples. The results demonstrated that the proposed method was feasible to detect a sub-millimeter deformation for thin tubes with ultrasound transducer of relatively low center frequency and electronic circuit of limited temporal resolution.

[学科分类] 电子、光学、磁材料

[关键词] photoacoustic;pulse width;measurement;small deformation