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Edsall C, Huynh L, Mustafa W, Hall TL, Durmaz YY, Vlaisavljevich E. Nanoparticle-Mediated Histotripsy Using Dual-Frequency Pulsing Methods. ULTRASOUND IN MEDICINE & BIOLOGY 2024:S0301-5629(24)00186-8. [PMID: 38797630 DOI: 10.1016/j.ultrasmedbio.2024.04.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2023] [Revised: 04/19/2024] [Accepted: 04/21/2024] [Indexed: 05/29/2024]
Abstract
OBJECTIVE Nanoparticle-mediated histotripsy (NMH) is a novel ablation method that combines nanoparticles as artificial cavitation nuclei with focused ultrasound pulsing to achieve targeted, non-invasive, and cell-selective tumor ablation. The study described here examined the effect of dual-frequency histotripsy pulsing on the cavitation threshold, bubble cloud characteristics, and ablative efficiency in NMH. High-speed optical imaging was used to analyze bubble cloud characteristics and to measure ablation efficiency for NMH inside agarose tissue phantoms containing perfluorohexane-filled nanocone clusters, which were previously developed to reduce the histotripsy cavitation threshold for NMH. METHODS Dual-frequency histotripsy pulsing was applied at a 1:1 pressure ratio using a modular 500 kHz and 3 MHz dual-frequency array transducer. Optical imaging results revealed predictable, well-defined bubble clouds generated for all tested cases with similar reductions in the cavitation thresholds observed for single-frequency and dual-frequency pulsing. RESULTS Dual-frequency pulsing was seen to nucleate small, dense clouds in agarose phantoms, intermediate in size of their component frequencies but closer in area to that of the higher component frequency. Red blood cell experiments revealed complete ablations were generated by dual-frequency NMH in all phantoms in <1500 pulses. This result was a significant increase in ablation efficiency compared with the ∼4000 pulses required in prior single-frequency NMH studies. CONCLUSION Overall, this study indicates the potential for using dual-frequency histotripsy methods to increase the ablation efficacy of NMH.
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Affiliation(s)
- Connor Edsall
- Department of Biomedical Engineering and Mechanics, Virginia Polytechnic Institute and State University, Blacksburg, VA, USA.
| | - Laura Huynh
- Department of Materials Science and Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA, USA
| | - Waleed Mustafa
- Department of Biomedical Engineering, Istanbul Medipol University, İstanbul, Turkey
| | - Timothy L Hall
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI, USA
| | - Yasemin Yuksel Durmaz
- Department of Biomedical Engineering, Istanbul Medipol University, İstanbul, Turkey; Research Institute of Health Science and Technologies (SABITA), Istanbul Medipol University, Istanbul, Turkey
| | - Eli Vlaisavljevich
- Department of Biomedical Engineering and Mechanics, Virginia Polytechnic Institute and State University, Blacksburg, VA, USA; ICTAS Center for Engineered Health, Virginia Polytechnic Institute and State University, Blacksburg, VA, USA
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Huang Y, Ouyang W, Lai Z, Qiu G, Bu Z, Zhu X, Wang Q, Yu Y, Liu J. Nanotechnology-enabled sonodynamic therapy against malignant tumors. NANOSCALE ADVANCES 2024; 6:1974-1991. [PMID: 38633037 PMCID: PMC11019498 DOI: 10.1039/d3na00738c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/05/2023] [Accepted: 02/09/2024] [Indexed: 04/19/2024]
Abstract
Sonodynamic therapy (SDT) is an emerging approach for malignant tumor treatment, offering high precision, deep tissue penetration, and minimal side effects. The rapid advancements in nanotechnology, particularly in cancer treatment, have enhanced the efficacy and targeting specificity of SDT. Combining sonodynamic therapy with nanotechnology offers a promising direction for future cancer treatments. In this review, we first systematically discussed the anti-tumor mechanism of SDT and then summarized the common nanotechnology-related sonosensitizers and their recent applications. Subsequently, nanotechnology-related therapies derived using the SDT mechanism were elaborated. Finally, the role of nanomaterials in SDT combined therapy was also introduced.
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Affiliation(s)
- Yunxi Huang
- Department of Medical Ultrasound, Guangxi Medical University Cancer Hospital 77 He Di Road 530021 Nanning China
| | - Wenhao Ouyang
- Guangdong Provincial Key Laboratory of Malignant Tumor Epigenetics and Gene Regulation, Department of Medical Oncology, Yat-sen Supercomputer Intelligent Medical Joint Research Institute, Phase I Clinical Trial Centre, Sun Yat-sen Memorial Hospital, Sun Yat-sen University 510120 Guangzhou China
| | - Zijia Lai
- First Clinical Medical College, Guangdong Medical University 524000 Zhanjiang China
| | - Guanhua Qiu
- Department of Medical Ultrasound, Guangxi Medical University Cancer Hospital 77 He Di Road 530021 Nanning China
| | - Zhaoting Bu
- Department of Medical Ultrasound, Guangxi Medical University Cancer Hospital 77 He Di Road 530021 Nanning China
| | - Xiaoqi Zhu
- Department of Medical Ultrasound, Guangxi Medical University Cancer Hospital 77 He Di Road 530021 Nanning China
| | - Qin Wang
- Department of Medical Ultrasound, Guangxi Medical University Cancer Hospital 77 He Di Road 530021 Nanning China
| | - Yunfang Yu
- Guangdong Provincial Key Laboratory of Malignant Tumor Epigenetics and Gene Regulation, Department of Medical Oncology, Yat-sen Supercomputer Intelligent Medical Joint Research Institute, Phase I Clinical Trial Centre, Sun Yat-sen Memorial Hospital, Sun Yat-sen University 510120 Guangzhou China
- Faculty of Medicine, Macau University of Science and Technology Taipa Macao PR China
| | - Junjie Liu
- Department of Medical Ultrasound, Guangxi Medical University Cancer Hospital 77 He Di Road 530021 Nanning China
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Appadurai V, Kinno M, Minga I, Slostad B, Cascino GJ, Nayak T, Kane B, Maganti K. The value of ultrasound enhancing agents in the echocardiographic acquisition of pulmonary artery systolic pressure: An invasive to non-invasive correlation study. THE INTERNATIONAL JOURNAL OF CARDIOVASCULAR IMAGING 2024:10.1007/s10554-024-03051-9. [PMID: 38236363 DOI: 10.1007/s10554-024-03051-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2023] [Accepted: 01/07/2024] [Indexed: 01/19/2024]
Abstract
PURPOSE Right heart catheterization (RHC) is the gold standard for the assessment of pulmonary artery systolic pressures (PASP). Despite high utilization of echocardiography for the non-invasive assessment of PASP, the data comparing real-time non-invasive echocardiographic PASP with invasive PASP is limited. Furthermore, evidence regarding the utility and diagnostic accuracy of ultrasound enhancing agents (UEA) for non-invasive PASP assessment is lacking. To evaluate the accuracy of non-invasive PASP assessment with real-time invasive measures and the incremental benefit of UEA in this setting. METHODS This was a prospective cohort study of 90 patients, undergoing clinically indicated RHC for hemodynamic assessment. All patients underwent a limited echocardiogram during RHC. Tricuspid regurgitant velocity (TRV) was measured on unenhanced echo, in the setting of centrally administrated agitated saline, then as either centrally administered or peripherally administered UEA. RESULTS Of the 90 patients enrolled in our study, 41% had pulmonary hypertension. The overall mean PASP measured by RHC was 32.8 mmHg (+/- 11.3 mmHg). Unenhanced echocardiograms had a moderate correlation with invasive PASP (r = 0.57; p = < 0.001) which improved to a strong correlation with administration of agitated saline (r = 0.75; p = < 0.001) or centrally administered UEA (r = 0.77; p = < 0.001), with the best correlation noted with peripherally administered UEA (r = 0.83; p = < 0.001). Against invasive PASP, agitated saline enhanced PASP had the lowest bias (0.12mmHg; -15.6 to 15.8mmHg) when compared with all other non-invasive measures of PASP. CONCLUSIONS Unenhanced echocardiographic estimation of TRV was found to have a poorer correlation with invasively measured PASP when compared to agitated saline and centrally administered UEA. Agitated saline enhanced PASP demonstrated the lowest bias with invasive PASP when compared to other non-invasive measures of PASP.
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Affiliation(s)
- Vinesh Appadurai
- Division of Cardiology, Feinberg School of Medicine, Northwestern Memorial Hospital, Chicago, IL, USA
- School of medicine, The University of Queensland, St Lucia, QLD, Australia
| | - Menhel Kinno
- Division of Cardiology, Loyola University Stritch School of Medicine, Chicago, IL, USA
| | - Iva Minga
- Northshore University Health System, Evanston, IL, USA
- University of Chicago Medical Center, Chicago, IL, USA
| | - Brody Slostad
- Division of Cardiology, Feinberg School of Medicine, Northwestern Memorial Hospital, Chicago, IL, USA
| | - Gregory J Cascino
- Division of Cardiology, Feinberg School of Medicine, Northwestern Memorial Hospital, Chicago, IL, USA
| | - Tanvi Nayak
- Division of Cardiology, Feinberg School of Medicine, Northwestern Memorial Hospital, Chicago, IL, USA
| | - Bonnie Kane
- Division of Cardiology, Feinberg School of Medicine, Northwestern Memorial Hospital, Chicago, IL, USA
| | - Kameswari Maganti
- Division of Cardiovascular Disease, Rutgers Robert Wood Johnson Medical School, 1 Robert Wood Johnson Place, New Brunswick, NJ, 08901, USA.
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Mano T, Grutman T, Ilovitsh T. Versatile Ultrasound-Compatible Microfluidic Platform for In Vitro Microvasculature Flow Research and Imaging Optimization. ACS OMEGA 2023; 8:47667-47677. [PMID: 38144052 PMCID: PMC10734021 DOI: 10.1021/acsomega.3c05849] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/09/2023] [Revised: 11/16/2023] [Accepted: 11/22/2023] [Indexed: 12/26/2023]
Abstract
Ultrasound localization microscopy (ULM) enables the creation of super-resolved images and velocity maps by localizing and tracking microbubble contrast agents through a vascular network over thousands of frames of ultrafast plane wave images. However, a significant challenge lies in developing ultrasound-compatible microvasculature phantoms to investigate microbubble flow and distribution in controlled environments. In this study, we introduce a new class of gelatin-based microfluidic-inspired phantoms uniquely tailored for ULM studies. These devices allow for the creation of complex and reproducible microvascular networks featuring channel diameters as small as 100 μm. Our experiments focused on microbubble behavior under ULM conditions within bifurcating and converging vessel phantoms. We evaluated the impact of bifurcation angles (25, 45, and 55°) and flow rates (0.01, 0.02, and 0.03 mL/min) on the acquisition time of branching channels. Additionally, we explored the saturation time effect of narrow channels branching off larger ones. Significantly longer acquisition times were observed for the narrow vessels, with an average increase of 72% when a 100 μm channel branched off from a 300 μm channel and an average increase of 90% for a 200 μm channel branching off from a 500 μm channel. The robustness of our fabrication method is demonstrated through the creation of two trifurcating microfluidic phantoms, including one that converges back into a single channel, a configuration that cannot be achieved through traditional methods. This new class of ULM phantoms serves as a versatile platform for noninvasively studying complex flow patterns using ultrasound imaging, unlocking new possibilities for in vitro microvasculature research and imaging optimization.
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Affiliation(s)
- Tamar Mano
- Department
of Biomedical Engineering, Tel Aviv University, Tel Aviv 6997801, Israel
| | - Tal Grutman
- Department
of Biomedical Engineering, Tel Aviv University, Tel Aviv 6997801, Israel
| | - Tali Ilovitsh
- Department
of Biomedical Engineering, Tel Aviv University, Tel Aviv 6997801, Israel
- The
Sagol School of Neuroscience, Tel Aviv University, Tel Aviv 6997801, Israel
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Deng L, Lea-Banks H, Jones RM, O’Reilly MA, Hynynen K. Three-dimensional super resolution ultrasound imaging with a multi-frequency hemispherical phased array. Med Phys 2023; 50:7478-7497. [PMID: 37702919 PMCID: PMC10872837 DOI: 10.1002/mp.16733] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2023] [Accepted: 08/27/2023] [Indexed: 09/14/2023] Open
Abstract
BACKGROUND High resolution imaging of the microvasculature plays an important role in both diagnostic and therapeutic applications in the brain. However, ultrasound pulse-echo sonography imaging the brain vasculatures has been limited to narrow acoustic windows and low frequencies due to the distortion of the skull bone, which sacrifices axial resolution since it is pulse length dependent. PURPOSE To overcome the detect limit, a large aperture 256-module sparse hemispherical transmit/receive array was used to visualize the acoustic emissions of ultrasound-vaporized lipid-coated decafluorobutane nanodroplets flowing through tube phantoms and within rabbit cerebral vasculature in vivo via passive acoustic mapping and super resolution techniques. METHODS Nanodroplets were vaporized with 55 kHz burst-mode ultrasound (burst length = 145 μs, burst repetition frequency = 9-45 Hz, peak negative acoustic pressure = 0.10-0.22 MPa), which propagates through overlying tissues well without suffering from severe distortions. The resulting emissions were received at a higher frequency (612 or 1224 kHz subarray) to improve the resulting spatial resolution during passive beamforming. Normal resolution three-dimensional images were formed using a delay, sum, and integrate beamforming algorithm, and super-resolved images were extracted via Gaussian fitting of the estimated point-spread-function to the normal resolution data. RESULTS With super resolution techniques, the mean lateral (axial) full-width-at-half-maximum image intensity was 16 ± 3 (32 ± 6) μm, and 7 ± 1 (15 ± 2) μm corresponding to ∼1/67 of the normal resolution at 612 and 1224 kHz, respectively. The mean positional uncertainties were ∼1/350 (lateral) and ∼1/180 (axial) of the receive wavelength in water. In addition, a temporal correlation between nanodroplet vaporization and the transmit waveform shape was observed, which may provide the opportunity to enhance the signal-to-noise ratio in future studies. CONCLUSIONS Here, we demonstrate the feasibility of vaporizing nanodroplets via low frequency ultrasound and simultaneously performing spatial mapping via passive beamforming at higher frequencies to improve the resulting spatial resolution of super resolution imaging techniques. This method may enable complete four-dimensional vascular mapping in organs where a hemispherical array could be positioned to surround the target, such as the brain, breast, or testicles.
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Affiliation(s)
- Lulu Deng
- Physical Sciences Platform, Sunnybrook Research Institute, Toronto, Ontario, M4N 3M5, Canada
| | - Harriet Lea-Banks
- Physical Sciences Platform, Sunnybrook Research Institute, Toronto, Ontario, M4N 3M5, Canada
| | - Ryan M. Jones
- Physical Sciences Platform, Sunnybrook Research Institute, Toronto, Ontario, M4N 3M5, Canada
| | - Meaghan A. O’Reilly
- Physical Sciences Platform, Sunnybrook Research Institute, Toronto, Ontario, M4N 3M5, Canada
- Department of Medical Biophysics, University of Toronto, Toronto, Ontario, M5G 1L7, Canada
| | - Kullervo Hynynen
- Physical Sciences Platform, Sunnybrook Research Institute, Toronto, Ontario, M4N 3M5, Canada
- Department of Medical Biophysics, University of Toronto, Toronto, Ontario, M5G 1L7, Canada
- Institute of Biomedical Engineering, University of Toronto, Toronto, Ontario, M5S 3E2, Canada
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Martinez P, Song JJ, Garay FG, Song KH, Mufford T, Steiner J, DeSisto J, Ellens N, Serkova NJ, Green AL, Borden M. Comprehensive Assessment of Blood-Brain Barrier Opening and Sterile Inflammatory Response: Unraveling the Therapeutic Window. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.10.23.563613. [PMID: 37961395 PMCID: PMC10634745 DOI: 10.1101/2023.10.23.563613] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2023]
Abstract
Microbubbles (MBs) combined with focused ultrasound (FUS) have emerged as a promising noninvasive technique to permeabilize the blood-brain barrier (BBB) for drug delivery to the brain. However, the safety and biological consequences of BBB opening remain incompletely understood. This study investigates the effects of varying microbubble volume doses (MVD) and ultrasound mechanical indices (MI) on BBB opening and the sterile inflammatory response (SIR) using high-resolution ultra-high field MRI-guided FUS in mouse brains. The results demonstrate that both MVD and MI significantly influence the extent of BBB opening, with higher doses and mechanical indices leading to increased permeability. Moreover, RNA sequencing reveals upregulated inflammatory pathways and immune cell infiltration after BBB opening, suggesting the presence and extent of SIR. Gene set enrichment analysis identifies 12 gene sets associated with inflammatory responses that are upregulated at higher doses of MVD or MI. A therapeutic window is established between significant BBB opening and the onset of SIR, providing operating regimes for avoiding each three classes of increasing damage from stimulation of the NFκB pathway via TNFL signaling to apoptosis. This study contributes to the optimization and standardization of BBB opening parameters for safe and effective drug delivery to the brain and sheds light on the underlying molecular mechanisms of the sterile inflammatory response. Significance Statement The significance of this study lies in its comprehensive investigation of microbubble-facilitated focused ultrasound for blood-brain barrier (BBB) opening. By systematically exploring various combinations of microbubble volume doses and ultrasound mechanical indices, the study reveals their direct impact on the extent of BBB permeability and the induction of sterile inflammatory response (SIR). The establishment of a therapeutic window between significant BBB opening and the onset of SIR provides critical insights for safe and targeted drug delivery to the brain. These findings advance our understanding of the biological consequences of BBB opening and contribute to optimizing parameters for clinical applications, thus minimizing potential health risks, and maximizing the therapeutic potential of this technique.
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Katz S, Gattegno R, Peko L, Zarik R, Hagani Y, Ilovitsh T. Diameter-dependent assessment of microvascular leakage following ultrasound-mediated blood-brain barrier opening. iScience 2023; 26:106965. [PMID: 37378309 PMCID: PMC10291464 DOI: 10.1016/j.isci.2023.106965] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2023] [Revised: 05/01/2023] [Accepted: 05/22/2023] [Indexed: 06/29/2023] Open
Abstract
Blood brain barrier disruption (BBBD) using focused ultrasound (FUS) and microbubbles (MB) is an effective tool for therapeutic delivery to the brain. BBBD depends to a great extent on MB oscillations. Because the brain vasculature is heterogenic in diameter, reduced MB oscillations in smaller blood vessels, together with a lower number of MBs in capillaries, can lead to variations in BBBD. Therefore, evaluating the impact of microvasculature diameter on BBBD is of great importance. We present a method to characterize molecules extravasation following FUS-mediated BBBD, at a single blood vessel resolution. Evans blue (EB) leakage was used as marker for BBBD, whereas blood vessels localization was done using FITC labeled Dextran. Automated image processing pipeline was developed to quantify the extent of extravasation as function of microvasculature diameter, including a wide range of vascular morphological parameters. Variations in MB vibrational response were observed in blood vessel mimicking fibers with varied diameters. Higher peak negative pressures (PNP) were required to initiate stable cavitation in fibers with smaller diameters. In vivo in the treated brains, EB extravasation increased as a function of blood vessel diameter. The percentage of strong BBBD blood vessels increased from 9.75% for 2-3 μm blood vessels to 91.67% for 9-10 μm. Using this method, it is possible to conduct a diameter-dependent analysis that measures vascular leakage resulting from FUS-mediated BBBD at a single blood vessel resolution.
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Affiliation(s)
- Sharon Katz
- Department of Biomedical Engineering, Tel Aviv University, Tel Aviv, Israel
- The Sagol School of Neuroscience, Tel Aviv University, Tel Aviv, Israel
| | - Roni Gattegno
- The Sagol School of Neuroscience, Tel Aviv University, Tel Aviv, Israel
| | - Lea Peko
- Department of Biomedical Engineering, Tel Aviv University, Tel Aviv, Israel
| | - Romario Zarik
- Department of Biomedical Engineering, Tel Aviv University, Tel Aviv, Israel
- The Sagol School of Neuroscience, Tel Aviv University, Tel Aviv, Israel
| | - Yulie Hagani
- Department of Biomedical Engineering, Tel Aviv University, Tel Aviv, Israel
- The Sagol School of Neuroscience, Tel Aviv University, Tel Aviv, Israel
| | - Tali Ilovitsh
- Department of Biomedical Engineering, Tel Aviv University, Tel Aviv, Israel
- The Sagol School of Neuroscience, Tel Aviv University, Tel Aviv, Israel
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Orita Y, Shimanuki S, Okada S, Nakamura K, Nakamura H, Kitamoto Y, Shimoyama Y, Kurashina Y. Acoustic-responsive carbon dioxide-loaded liposomes for efficient drug release. ULTRASONICS SONOCHEMISTRY 2023; 94:106326. [PMID: 36796146 PMCID: PMC9958408 DOI: 10.1016/j.ultsonch.2023.106326] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/30/2022] [Revised: 01/21/2023] [Accepted: 02/08/2023] [Indexed: 06/18/2023]
Abstract
The role of liposomes as drug carriers has been investigated. Ultrasound-based drug release methods have been developed for on-demand drug delivery. However, the acoustic responses of current liposome carriers result in low drug release efficiency. In this study, CO2-loaded liposomes were synthesized under high pressure from supercritical CO2 and irradiated with ultrasound at 237 kHz to demonstrate their superior acoustic responsiveness. When liposomes containing fluorescent drug models were irradiated with ultrasound under acoustic pressure conditions that are safe for the human body, CO2-loaded liposomes synthesized using supercritical CO2 had 17.1 times higher release efficiency than liposomes synthesized using the conventional Bangham method. In particular, the release efficiency of CO2-loaded liposomes synthesized using supercritical CO2 and monoethanolamine was 19.8 times higher than liposomes synthesized using the conventional Bangham method. These findings on the release efficiency of acoustic-responsive liposomes suggest an alternative liposome synthesis strategy for on-demand release of drugs by ultrasound irradiation in future therapies.
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Affiliation(s)
- Yasuhiko Orita
- Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-Ku, Tokyo 152-8550, Japan
| | - Susumu Shimanuki
- Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, 4259 Nagatsutacho, Midori-Ku, Yokohama 226-8503, Japan
| | - Satoshi Okada
- Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsutacho, Midori- Ku, Yokohama 226-8503, Japan
| | - Kentaro Nakamura
- Laboratory for Future Interdisciplinary Research of Science and Technology, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsutacho, Midori- Ku, Yokohama 226-8503, Japan
| | - Hiroyuki Nakamura
- Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsutacho, Midori- Ku, Yokohama 226-8503, Japan
| | - Yoshitaka Kitamoto
- Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, 4259 Nagatsutacho, Midori-Ku, Yokohama 226-8503, Japan
| | - Yusuke Shimoyama
- Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-Ku, Tokyo 152-8550, Japan
| | - Yuta Kurashina
- Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, 4259 Nagatsutacho, Midori-Ku, Yokohama 226-8503, Japan; Division of Advanced Mechanical Systems Engineering, Institute of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei-Shi, Tokyo 184-8588, Japan.
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Development of an ultrasound guided focused ultrasound system for 3D volumetric low energy nanodroplet-mediated histotripsy. Sci Rep 2022; 12:20664. [PMID: 36450815 PMCID: PMC9712369 DOI: 10.1038/s41598-022-25129-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2022] [Accepted: 11/24/2022] [Indexed: 12/03/2022] Open
Abstract
Low pressure histotripsy is likely to facilitate current treatments that require extremely high pressures. An ultrasound guided focused ultrasound system was designed to accommodate a rotating imaging transducer within a low frequency therapeutic transducer that operates at a center frequency of 105 kHz. The implementation of this integrated system provides real-time therapeutic and volumetric imaging functions, that are used here for low-cost, low-energy 3D volumetric ultrasound histotripsy using nanodroplets. A two-step approach for low pressure histotripsy is implemented with this dual-array. Vaporization of nanodroplets into gaseous microbubbles was performed via the 1D rotating imaging probe. The therapeutic transducer is then used to detonate the vaporized nanodroplets and trigger potent mechanical effects in the surrounding tissue. Rotating the imaging transducer creates a circular vaporized nanodroplet shape which generates a round lesion upon detonation. This contrasts with the elongated lesion formed when using a standard 1D imaging transducer for nanodroplet activation. Optimization experiments show that maximal nanodroplet activation can be achieved with a 2-cycle excitation pulse at a center frequency of 3.5 MHz, and a peak negative pressure of 3.4 MPa (a mechanical index of 1.84). Vaporized nanodroplet detonation was achieved by applying a low frequency treatment at a center frequency of 105 kHz and mechanical index of 0.9. In ex-vivo samples, the rotated nanodroplet activation method yielded the largest lesion area, with a mean of 4.7 ± 0.5 mm2, and a rounded shape. In comparison, standard fixed transducer nanodroplet activation resulted in an average lesion area of 2.6 ± 0.4 mm2, and an elongated shape. This hybrid system enables to achieve volumetric low energy histotripsy, and thus facilitates the creation of precise, large-volume mechanical lesions in tissues, while reducing the pressure threshold required for standard histotripsy by over an order of magnitude.
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Abiteboul R, Ilovitsh T. Optimized Simultaneous Axial Multifocal Imaging via Frequency Multiplexed Focusing. IEEE TRANSACTIONS ON ULTRASONICS, FERROELECTRICS, AND FREQUENCY CONTROL 2022; 69:2930-2942. [PMID: 35984787 DOI: 10.1109/tuffc.2022.3200468] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Simultaneous axial multifocal imaging (SAMI) using a single acoustical transmission was developed to enhance the depth of field. This technique transmits a superposition of axial multifoci waveforms in a single transmission, thus increasing the frame rate. However, since all the waveforms are transmitted at a constant center frequency, there is a tradeoff between attenuation and lateral resolution when choosing a constant frequency for all the axial depths. In this work, we developed an optimized SAMI method by adding frequency dependence to each axial multifocus. By gradually increasing the frequency as a function of the focal depth, this method makes it possible to compensate for the gradually increasing F-number in order to achieve constant lateral resolution across the entire field of view. Alternatively, by gradually decreasing the axial multifoci frequencies as a function of depth, enhanced penetration depth and contrast are obtained. This method, termed frequency multiplexed SAMI (FM-SAMI), is described analytically and validated by resolution and contrast experiments performed on resolution targets, tissue-mimicking phantoms, and ex vivo biological samples. This is the first real-time implementation of a frequency multiplexing approach for axial multifoci imaging that facilitates high-quality imaging at an increased frame rate.
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11
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Bismuth M, Katz S, Mano T, Aronovich R, Hershkovitz D, Exner AA, Ilovitsh T. Low frequency nanobubble-enhanced ultrasound mechanotherapy for noninvasive cancer surgery. NANOSCALE 2022; 14:13614-13627. [PMID: 36070492 DOI: 10.1039/d2nr01367c] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Scaling down the size of microbubble contrast agents to the nanometer level holds the promise for noninvasive cancer therapy. However, the small size of nanobubbles limits the obtained bioeffects as a result of ultrasound cavitation, when operating near the nanobubble resonance frequency. Here we show that coupled with low energy insonation at a frequency of 80 kHz, well below the resonance frequency of these agents, nanobubbles serve as noninvasive therapeutic warheads that trigger potent mechanical effects in tumors following a systemic injection. We demonstrate these capabilities in tissue mimicking phantoms, where a comparison of the acoustic response of micro- and nano-bubbles after insonation at a frequency of 250 or 80 kHz revealed that higher pressures were needed to implode the nanobubbles compared to microbubbles. Complete nanobubble destruction was achieved at a mechanical index of 2.6 for the 250 kHz insonation vs. 1.2 for the 80 kHz frequency. Thus, the 80 kHz insonation complies with safety regulations that recommend operation below a mechanical index of 1.9. In vitro in breast cancer tumor cells, the cell viability was reduced to 17.3 ± 1.7% of live cells. In vivo, in a breast cancer tumor mouse model, nanobubble tumor distribution and accumulation were evaluated by high frequency ultrasound imaging. Finally, nanobubble-mediated low frequency insonation of breast cancer tumors resulted in effective mechanical tumor ablation and tumor tissue fractionation. This approach provides a unique theranostic platform for safe, noninvasive and low energy tumor mechanotherapy.
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Affiliation(s)
- Mike Bismuth
- Department of Biomedical Engineering, Tel Aviv University, Tel Aviv 6997801, Israel.
| | - Sharon Katz
- Department of Biomedical Engineering, Tel Aviv University, Tel Aviv 6997801, Israel.
- The Sagol School of Neuroscience, Tel Aviv University, Tel Aviv 6997801, Israel
| | - Tamar Mano
- Department of Biomedical Engineering, Tel Aviv University, Tel Aviv 6997801, Israel.
| | - Ramona Aronovich
- Department of Biomedical Engineering, Tel Aviv University, Tel Aviv 6997801, Israel.
| | - Dov Hershkovitz
- Department of Pathology, Tel-Aviv Sourasky Medical Center, Sackler Faculty of Medicine, Tel-Aviv University, Tel Aviv 6997800, Israel
| | - Agata A Exner
- Departments of Radiology and Biomedical Engineering, Case Western Reserve University, Cleveland, OH, USA
| | - Tali Ilovitsh
- Department of Biomedical Engineering, Tel Aviv University, Tel Aviv 6997801, Israel.
- The Sagol School of Neuroscience, Tel Aviv University, Tel Aviv 6997801, Israel
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