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For: Tsujimoto Y, Morimoto M, Nitta N, Akiyama I. Ultrasonic measurement of sound velocity fluctuations in biological tissue due to ultrasonic heating and estimation of thermo-physical properties. J Med Ultrason (2001) 2018;46:35-43. [DOI: 10.1007/s10396-018-0916-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2018] [Accepted: 10/14/2018] [Indexed: 10/27/2022]

For:	Tsujimoto Y, Morimoto M, Nitta N, Akiyama I. Ultrasonic measurement of sound velocity fluctuations in biological tissue due to ultrasonic heating and estimation of thermo-physical properties. J Med Ultrason (2001) 2018;46:35-43. [DOI: 10.1007/s10396-018-0916-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2018] [Accepted: 10/14/2018] [Indexed: 10/27/2022]

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Cited by Other Article(s)

Saito N, Tanaka T, Minamiguchi K, Taiji R, Nishiofuku H, Matsumoto T, Hirai T, Kichikawa K, Kawahara N, Matsuda D, Akiyama I. Ultrasonic Heating Detects Lipiodol Deposition within Liver Tumors after Transarterial Embolization: An In Vivo Approach. BIOLOGY 2021;10:biology10090901. [PMID: 34571777 PMCID: PMC8466351 DOI: 10.3390/biology10090901] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/23/2021] [Revised: 09/07/2021] [Accepted: 09/09/2021] [Indexed: 11/16/2022]

Abstract

Simple Summary

The accumulation of Lipiodol (ethiodized oil) after transarterial embolization is known to reflect tumor necrosis. In general, the treatment effect is evaluated by computed tomography; there has been no development in imaging modalities for several decades. A new technique, ultrasonic heating, can differentiate biological tissues based on the fact that tissues’ characteristic sound velocity varies depending on the temperature. This technique could have the potential to evaluate treatment effect after transarterial embolization as an alternative to computed tomography.

Abstract

Computed tomography (CT) is the standard method to evaluate Lipiodol deposition after transarterial embolization (TAE) for a long period. However, iodine but not Lipiodol can be observed on CT. A minimally invasive other method to detect Lipiodol has been needed to evaluate accurate evaluation after procedure. The purpose of this study was to evaluate the efficacy of using the rate of change in sound velocity caused by ultrasonic heating to reflect Lipiodol accumulation after TAE in a rat liver tumor model. We analyzed the association of this developed technique with CT images and histological findings. Eight rats bearing N1S1 cells were prepared. After confirmation of tumor development in a rat liver, Lipiodol was injected via the hepatic artery. Seven days after TAE, CT scan and sound velocity changes caused by ultrasonic heating were measured, and then the rats were sacrificed. An ultrasonic pulse-echo method was used to measure the sound velocity. The temperature coefficient of the sound velocity in each treated tumor was evaluated and compared with the mean CT value and the histological Lipiodol accumulation ratio. Pearson’s correlation coefficients were calculated to assess the correlation between the measured values. The correlation coefficient (r) of the mean CT value and histological Lipiodol accumulation ratio was 0.835 (p = 0.010), which was considered statistically significant. Also, those of the temperature coefficient of the sound velocity and the histological Lipiodol accumulation ratio were statistically significant (r = 0.804; p = 0.016). To our knowledge, this is the first study that reported the efficacy of ultrasonic heating to detect Lipiodol accumulation in rat liver tumors after TAE. Our results suggest that the rate of change in sound velocity caused by ultrasonic heating can be used to evaluate Lipiodol accumulation in liver tumors after TAE, and thus could represent an alternative to CT in this application. This new innovative technique is easy to treat and less invasive in terms of avoiding radiation compared with CT.

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Affiliation(s)

Natsuhiko Saito Department of Radiology and Nuclear Medicine, Nara Medical University, Kashihara Nara 634-8521, Japan; (T.T.); (K.M.); (R.T.); (H.N.); (T.M.); (T.H.); (K.K.) Correspondence:
Toshihiro Tanaka Department of Radiology and Nuclear Medicine, Nara Medical University, Kashihara Nara 634-8521, Japan; (T.T.); (K.M.); (R.T.); (H.N.); (T.M.); (T.H.); (K.K.)
Kiyoyuki Minamiguchi Department of Radiology and Nuclear Medicine, Nara Medical University, Kashihara Nara 634-8521, Japan; (T.T.); (K.M.); (R.T.); (H.N.); (T.M.); (T.H.); (K.K.)
Ryosuke Taiji Department of Radiology and Nuclear Medicine, Nara Medical University, Kashihara Nara 634-8521, Japan; (T.T.); (K.M.); (R.T.); (H.N.); (T.M.); (T.H.); (K.K.)
Hideyuki Nishiofuku Department of Radiology and Nuclear Medicine, Nara Medical University, Kashihara Nara 634-8521, Japan; (T.T.); (K.M.); (R.T.); (H.N.); (T.M.); (T.H.); (K.K.)
Takeshi Matsumoto Department of Radiology and Nuclear Medicine, Nara Medical University, Kashihara Nara 634-8521, Japan; (T.T.); (K.M.); (R.T.); (H.N.); (T.M.); (T.H.); (K.K.)
Toshiko Hirai Department of Radiology and Nuclear Medicine, Nara Medical University, Kashihara Nara 634-8521, Japan; (T.T.); (K.M.); (R.T.); (H.N.); (T.M.); (T.H.); (K.K.)
Kimihiko Kichikawa Department of Radiology and Nuclear Medicine, Nara Medical University, Kashihara Nara 634-8521, Japan; (T.T.); (K.M.); (R.T.); (H.N.); (T.M.); (T.H.); (K.K.)
Naoki Kawahara Department of Medical Ultrasound Research Center, Doshisha University, Kyotanabe Kyoto 610-0321, Japan; (N.K.); (D.M.); (I.A.)
Daiki Matsuda Department of Medical Ultrasound Research Center, Doshisha University, Kyotanabe Kyoto 610-0321, Japan; (N.K.); (D.M.); (I.A.)
Iwaki Akiyama Department of Medical Ultrasound Research Center, Doshisha University, Kyotanabe Kyoto 610-0321, Japan; (N.K.); (D.M.); (I.A.)

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Alves TO, Lopes FC, Yamin PA, Navas EA, da Cruz Filho AM, De-Deus G, Sousa-Neto MD, Silva RG. An ultrasonic-based experimental model to evaluate the setting time of endodontic sealers. Int Endod J 2021;54:1948-1956. [PMID: 34181754 DOI: 10.1111/iej.13594] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2021] [Accepted: 06/25/2021] [Indexed: 11/28/2022]