title: Detection of tissue coagulation by decorrelation of ultrasonic echo signals in cavitation-enhanced high-intensity focused ultrasound treatment.
abstract: BACKGROUND
  A noninvasive technique to monitor thermal lesion formation is necessary to ensure the accuracy and safety of high-intensity focused ultrasound (HIFU) treatment. The purpose of this study is to ultrasonically detect the tissue change due to thermal coagulation in the HIFU treatment enhanced by cavitation microbubbles.
  
  
  METHODS
  An ultrasound imaging probe transmitted plane waves at a center frequency of 4.5 MHz. Ultrasonic radio-frequency (RF) echo signals during HIFU exposure at a frequency of 1.2 MHz were acquired. Cross-correlation coefficients were calculated between in-phase and quadrature (IQ) data of two B-mode images with an interval time of 50 and 500 ms for the estimation of the region of cavitation and coagulation, respectively. Pathological examination of the coagulated tissue was also performed to compare with the corresponding ultrasonically detected coagulation region.
  
  
  RESULTS
  The distribution of minimum hold cross-correlation coefficient between two sets of IQ data with 50-ms intervals was compared with a pulse inversion (PI) image. The regions with low cross-correlation coefficients approximately corresponded to those with high brightness in the PI image. The regions with low cross-correlation coefficients in 500-ms intervals showed a good agreement with those with significant change in histology.
  
  
  CONCLUSIONS
  The results show that the regions of coagulation and cavitation could be ultrasonically detected as those with low cross-correlation coefficients between RF frames with certain intervals. This method will contribute to improve the safety and accuracy of the HIFU treatment enhanced by cavitation microbubbles.
authors.affiliation: Graduate School of Engineering, Tohoku University, Sendai, 980-8579 Japan.
authors.forename: Shin
authors.initials: S
authors.lastname: Yoshizawa
authors.affiliation: Graduate School of Biomedical Engineering, Tohoku University, Sendai, 980-8579 Japan.
authors.forename: Keiko
authors.initials: K
authors.lastname: Matsuura
authors.affiliation: Graduate School of Engineering, Tohoku University, Sendai, 980-8579 Japan.
authors.forename: Ryo
authors.initials: R
authors.lastname: Takagi
authors.affiliation: Graduate School of Engineering, Tohoku University, Sendai, 980-8579 Japan.
authors.forename: Mariko
authors.initials: M
authors.lastname: Yamamoto
authors.affiliation: Graduate School of Biomedical Engineering, Tohoku University, Sendai, 980-8579 Japan.
authors.forename: Shin-Ichiro
authors.initials: S
authors.lastname: Umemura
keywords: Cavitation; Coagulation detection; Decorrelation; HIFU; Ultrasound imaging