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Ultrasound-Based Measurement of Molecular Marker Concentration in Large Blood Vessels: A Feasibility Study

Authors
Journal
Ultrasound in Medicine & Biology
0301-5629
Publisher
Elsevier
Identifiers
DOI: 10.1016/j.ultrasmedbio.2014.07.001
Keywords
  • Ultrasound
  • Molecular Imaging
  • Quantitative Measurement
  • Acoustic Radiation Force
Disciplines
  • Medicine
  • Musicology
  • Physics

Abstract

Abstract Ultrasound molecular imaging has demonstrated efficacy in pre-clinical studies for cancer and cardiovascular inflammation. However, these techniques often require lengthy protocols because of waiting periods or additional control microbubble injections. Moreover, they are not capable of quantifying molecular marker concentration in human tissue environments that exhibit variable attenuation and propagation path lengths. Our group recently investigated a modulated acoustic radiation force-based imaging sequence, which was found to detect targeted adhesion independent of control measurements. In the present study, this sequence was tested against various experimental parameters to determine its feasibility for quantitative measurements of molecular marker concentration. Results indicated that measurements obtained from the sequence (residual-to-saturation ratio, Rresid) were independent of acoustic pressure and attenuation (p > 0.13, n = 10) when acoustic pressures were sufficiently low. The Rresid parameter exhibited a linear relationship with measured molecular marker concentration (R2 > 0.94). Consequently, feasibility was illustrated in vitro, for quantification of molecular marker concentration in large vessels using a modulated acoustic radiation force-based sequence. Moreover, these measurements were independent of absolute acoustic reflection amplitude and used short imaging protocols (3 min) without control measurements.

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