Noninvasive measurement of aortic aneurysm sac tension with vibrometry

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Presentation transcript:

Noninvasive measurement of aortic aneurysm sac tension with vibrometry Geza Mozes, MD, PhD, Randall R. Kinnick, Peter Gloviczki, MD, Russell E. Bruhnke, Michele Carmo, MD, Tanya L. Hoskin, MS, Kevin E. Bennet, James F. Greenleaf, PhD Journal of Vascular Surgery Volume 42, Issue 5, Pages 963-971 (November 2005) DOI: 10.1016/j.jvs.2005.07.012 Copyright © 2005 The Society for Vascular Surgery Terms and Conditions

Fig 1 The nitrile rubber aneurysm sac model was connected to a pressure source through silicone rubber tubes. A 7F angiocatheter was inserted through a side connection to monitor pressure in the aneurysm sac (black arrowhead). Journal of Vascular Surgery 2005 42, 963-971DOI: (10.1016/j.jvs.2005.07.012) Copyright © 2005 The Society for Vascular Surgery Terms and Conditions

Fig 2 An amplitude-modulated ultrasound beam (black arrowhead) vibrated the surface of the aneurysm model (porcine aorta is shown). Continuous-wave Doppler imaging (white arrowhead) was used to detect the phase of the generated wall motion. Journal of Vascular Surgery 2005 42, 963-971DOI: (10.1016/j.jvs.2005.07.012) Copyright © 2005 The Society for Vascular Surgery Terms and Conditions

Fig 3 Measurement of phase shift. The radiation force of an amplitude-modulated ultrasound (US) beam vibrated the surface of the aneurysm. Continuous-wave Doppler imaging detected the phase of the propagating wave at different pressures (P1 and P2). The difference between the phase of the wave at P1 and P2 is the phase shift. Journal of Vascular Surgery 2005 42, 963-971DOI: (10.1016/j.jvs.2005.07.012) Copyright © 2005 The Society for Vascular Surgery Terms and Conditions

Fig 4 In the nitrile rubber aneurysm model, the square of the hydrostatic pressure applied by a static fluid column (50-110 mm Hg) correlated well with the cumulative phase shift. Different shapes (square and rhombus) of the plots label different sessions, whereas empty and dark plots with the same shape label different series within one session (R2 = 0.99; P < .0001). Journal of Vascular Surgery 2005 42, 963-971DOI: (10.1016/j.jvs.2005.07.012) Copyright © 2005 The Society for Vascular Surgery Terms and Conditions

Fig 5 In the nitrile rubber aneurysm model, the square of the hydrostatic pressure applied by a pressure bag (110-200 mm Hg) correlated well with the cumulative phase shift. Different shapes (square and rhombus) of the plots label different sessions, whereas empty and dark plots with the same shape label different series within one session (R2 = 0.96; P < .0001). Journal of Vascular Surgery 2005 42, 963-971DOI: (10.1016/j.jvs.2005.07.012) Copyright © 2005 The Society for Vascular Surgery Terms and Conditions

Fig 6 In the nitrile rubber aneurysm model, cumulative phase shift correlated poorly with the pulse pressure. Different shapes (square, rhombus, and triangle) of the plots label different sessions, whereas empty and dark plots with the same shape label different series within one session (r = 0.38; P < .02). Journal of Vascular Surgery 2005 42, 963-971DOI: (10.1016/j.jvs.2005.07.012) Copyright © 2005 The Society for Vascular Surgery Terms and Conditions

Fig 7 In the porcine model, the cumulative phase shift detected by Doppler correlated well with the aneurysm pressure. Different shapes (square, rhombus, and triangle) of the plots label different sessions, whereas empty and dark plots with the same shape label different series within one session (r = 0.96-0.99; P < .0001). Journal of Vascular Surgery 2005 42, 963-971DOI: (10.1016/j.jvs.2005.07.012) Copyright © 2005 The Society for Vascular Surgery Terms and Conditions