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He K, Ran H, Su Z, Wang Z, Li M, Hao L. Perfluorohexane-encapsulated fullerene nanospheres for dual-modality US/CT imaging and synergistic high-intensity focused ultrasound ablation. Int J Nanomedicine 2019; 14:519-529. [PMID: 30666111 PMCID: PMC6333388 DOI: 10.2147/ijn.s184579] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Purpose The objective of this study was to develop a multifunctional contrast agent for bioimaging and synergistic high-intensity focused ultrasound (HIFU) therapy to achieve theranostic. Materials and methods A novel type of perfluorohexane-encapsulated fullerene (PFH-C60) nanosphere was successfully developed via a vacuum ultrasonic emulsification and centrifugation method and subsequently used in ultrasound/computed tomography (CT) dual-modality and HIFU ablation of dissected bovine livers. In addition, transmission electron microscopic examination was employed to detect structural changes in the target tissue for HIFU ablation. Results The use of composite nanospheres effectively enhanced ultrasound and CT imaging. Moreover, the HIFU ablation of dissected bovine livers was also significantly enhanced. Conclusion Composite nanospheres demonstrate potential theranostic application as a multifunctional contrast agent for dual-modality biological imaging and highly efficient synergistic imaging-guided HIFU ablation.
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Affiliation(s)
- Kunyan He
- Ultrasound Department, The Fifth Affiliated Hospital, Sun Yat-sen University, Zhuhai, Guangdong Province 519000, People's Republic of China
| | - Haitao Ran
- Ultrasound Department, The second Affiliated Hospital, Chongqing Medical University, Chongqing 400010, People's Republic of China.,The Institute of Ultrasound Imaging, Chongqing Medical University, Chongqing 400010, People's Republic of China,
| | - Zhongzhen Su
- Ultrasound Department, The Fifth Affiliated Hospital, Sun Yat-sen University, Zhuhai, Guangdong Province 519000, People's Republic of China
| | - Zhigang Wang
- Ultrasound Department, The second Affiliated Hospital, Chongqing Medical University, Chongqing 400010, People's Republic of China.,The Institute of Ultrasound Imaging, Chongqing Medical University, Chongqing 400010, People's Republic of China,
| | - Maoping Li
- Ultrasound Department, The First Affiliated Hospital, Chongqing Medical University, Chongqing 400010, People's Republic of China
| | - Lan Hao
- The Institute of Ultrasound Imaging, Chongqing Medical University, Chongqing 400010, People's Republic of China,
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Liu J, Foiret J, Stephens DN, Le Baron O, Ferrara KW. Development of a spherically focused phased array transducer for ultrasonic image-guided hyperthermia. Phys Med Biol 2016; 61:5275-96. [PMID: 27353347 DOI: 10.1088/0031-9155/61/14/5275] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
A 1.5 MHz prolate spheroidal therapeutic array with 128 circular elements was designed to accommodate standard imaging arrays for ultrasonic image-guided hyperthermia. The implementation of this dual-array system integrates real-time therapeutic and imaging functions with a single ultrasound system (Vantage 256, Verasonics). To facilitate applications involving small animal imaging and therapy the array was designed to have a beam depth of field smaller than 3.5 mm and to electronically steer over distances greater than 1 cm in both the axial and lateral directions. In order to achieve the required f number of 0.69, 1-3 piezocomposite modules were mated within the transducer housing. The performance of the prototype array was experimentally evaluated with excellent agreement with numerical simulation. A focal volume (2.70 mm (axial) × 0.65 mm (transverse) × 0.35 mm (transverse)) defined by the -6 dB focal intensity was obtained to address the dimensions needed for small animal therapy. An electronic beam steering range defined by the -3 dB focal peak intensity (17 mm (axial) × 14 mm (transverse) × 12 mm (transverse)) and -8 dB lateral grating lobes (24 mm (axial) × 18 mm (transverse) × 16 mm (transverse)) was achieved. The combined testing of imaging and therapeutic functions confirmed well-controlled local heating generation and imaging in a tissue mimicking phantom. This dual-array implementation offers a practical means to achieve hyperthermia and ablation in small animal models and can be incorporated within protocols for ultrasound-mediated drug delivery.
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Affiliation(s)
- Jingfei Liu
- Department of Biomedical Engineering, University of California, Davis, CA 95616-8686, USA
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Harnof S, Zibly Z, Cohen Z, Shaw A, Schlaff C, Kassel NF. Cranial nerve threshold for thermal injury induced by MRI-guided high-intensity focused ultrasound (MRgHIFU): preliminary results on an optic nerve model. IEEE TRANSACTIONS ON ULTRASONICS, FERROELECTRICS, AND FREQUENCY CONTROL 2013; 60:702-705. [PMID: 23549530 DOI: 10.1109/tuffc.2013.2618] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Future clinical applications of magnetic resonance imaging-guided high-intensity focused ultrasound (MRgHIFU) are moving toward the management of different intracranial pathologies. We sought to validate the production, safety, and efficacy of thermal injury to cranial nerves generated by MRgHIFU. In this study, five female domestic pigs underwent a standard bifrontal craniectomy under general anesthesia. Treatment was then given using an MRgHIFU system to induce hyperthermic ablative sonication (6 to 10 s; 50 to 2000 J.) Histological analyses were done to confirm nerve damage; temperature measured on the optic nerve was approximately 53.4°C (range: 39°C to 70°C.) Histology demonstrated a clear definition between a necrotic, transitional zone, and normal tissue. MRgHIFU induces targeted thermal injury to nervous tissue within a specific threshold of 50°C to 60°C with the tissue near the sonication center yielding the greatest effect; adjacent tissue showed minimal changes. Additional studies utilizing this technology are required to further establish accurate threshold parameters for optic nerve thermo-ablation.
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Affiliation(s)
- Sagi Harnof
- Department of Neurosurgery, Chaim Sheba Medical Center, Tel Hashomer, Israel.
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Superparamagnetic PLGA-iron oxide microcapsules for dual-modality US/MR imaging and high intensity focused US breast cancer ablation. Biomaterials 2012; 33:5854-64. [DOI: 10.1016/j.biomaterials.2012.04.062] [Citation(s) in RCA: 170] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2012] [Accepted: 04/30/2012] [Indexed: 01/10/2023]
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Dogra VS, Zhang M, Bhatt S. High-Intensity Focused Ultrasound (HIFU) Therapy Applications. ACTA ACUST UNITED AC 2009. [DOI: 10.1016/j.cult.2009.10.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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Li Q, Du J, Yu M, He G, Luo W, Li H, Zhou X. Transmission electron microscopy of VX2 liver tumors after high-intensity focused ultrasound ablation enhanced with SonoVue. Adv Ther 2009; 26:117-25. [PMID: 19096769 DOI: 10.1007/s12325-008-0126-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2008] [Indexed: 11/27/2022]
Abstract
INTRODUCTION The purpose of this study was to observe sequential changes in rabbit VX2 liver tumors using transmission electron microscopy after high-intensity focused ultrasound (HIFU) ablation enhanced with the contrast agent SonoVuer (Bracco, Milan, Italy). METHODS Thirty New Zealand rabbits with VX2 liver tumors were randomly divided into two groups. The liver tumors of rabbits in Group A underwent single HIFU ablation; those in Group B were given the ultrasound contrast agent SonoVue 0.2 mL/kg before HIFU exposure. Five rabbits from each of the two groups were killed at 0 hours, 6 days, and 14 days after HIFU ablation. Tissue samples that included targeted and untargeted tissue were observed using transmission electron microscopy. RESULTS Using transmission electron microscopy, it was evident that most of the cellular organs in the targeted areas of tumors in Groups A and B had disappeared early after HIFU, but the basic cell structure was seen in Group A. On the sixth day after HIFU ablation, all cells in the targeted areas were disrupted, and fibrous bands were detected in the rims of targeted areas in both groups. In the surrounding areas, cell swelling in Group B was more severe than in Group A, and a greater number of apoptotic bodies were found in Group B. CONCLUSION The use of an ultrasound contrast agent can enhance the effects of HIFU ablation on the destruction of cell ultrastructure and can enlarge the region of HIFU ablation; this provides experimental evidence for the use of contrast agents in controlling the effects of HIFU.
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Affiliation(s)
- Qiuyang Li
- Department of Ultrasound, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi, China
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Yu T, Zhou S, Zhang J. Ultrasonic Therapy for Gynecologic Tumors. J Minim Invasive Gynecol 2008; 15:667-72. [DOI: 10.1016/j.jmig.2008.07.018] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2008] [Revised: 07/19/2008] [Accepted: 07/25/2008] [Indexed: 10/21/2022]
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Focused ultrasound for treatment of uterine myoma: From experimental model to clinical practice. SRP ARK CELOK LEK 2008; 136:193-5. [DOI: 10.2298/sarh0804193t] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
It is well known that focused ultrasound has a biologic effect on tissue. High intensity focused ultrasound (HIFU) on a small target area raises the temperature of the tissue enough to denaturate proteins and cause irreversible cell damage. The tight focus of the ultrasound energy allows delivery of the intended dose to a very precise location. The resulting coagulation necrosis is relatively painless. The application of this method in the human clinical setting has required pilot studies on an animal model. Although the treatment had a high success rate, there was a significant percentage of complications, mainly attributed to the technical drawbacks of the procedure. Therefore, this method has been modified for use in humans, and the HIFU is now guided, monitored and controlled by magnetic resonance imaging (MRI). In October 2004, Food and Drug Adiministration (FDA) approved MRI guided focused ultrasound treatment of uterine fibroids in humans. Since then, successful treatment of uterine myomas by HIFU has been performed in thousands of women.
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Luo W, Zhou X, Ren X, Zheng M, Zhang J, He G. Enhancing effects of SonoVue, a microbubble sonographic contrast agent, on high-intensity focused ultrasound ablation in rabbit livers in vivo. JOURNAL OF ULTRASOUND IN MEDICINE : OFFICIAL JOURNAL OF THE AMERICAN INSTITUTE OF ULTRASOUND IN MEDICINE 2007; 26:469-76. [PMID: 17384044 DOI: 10.7863/jum.2007.26.4.469] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
OBJECTIVE The purpose of this study was to explore the enhancing biological effects of SonoVue (Bracco SpA, Milan, Italy), a sulfur hexafluoride sonographic contrast agent, on high-intensity focused ultrasound (HIFU) ablation in vivo. METHODS Forty-five rabbits were randomly divided into 3 groups and underwent laparotomy. Animals in group 1 were given injections of 0.2 mL of SonoVue intravenously; animals in group 2 were given physiologic saline; and those in group 3 were not given injections as control. The exposure time was set at 2 seconds with the acoustic power at 600 W. After HIFU ablations, volumes of coagulated regions were measured. Liver tissues were examined under light microscopy with hematoxylin-eosin staining and under transmission electron microscopy. RESULTS Coagulated volumes in group 1 (mean +/- SD, 2.41 +/- 0.44 cm(3)) were larger than those in group 2 (0.80 +/- 0.13 cm(3)) and group 3 (0.83 +/- 0.16 cm(3)) (P < .05). Separated from the surrounding area with a clear demarcation line, the targeted area in each group showed a few necrotic cells on light microscopy with the hematoxylin-eosin stain. More bubbles were observed under light microscopy in exposed areas in group 1 than in the other 2 groups (P < .05). Electron microscopy showed more severe cell ultrastructure disorder, including more interrupted cell nuclear membranes, in targeted areas in group 1 than in the other 2 groups. Conversely, in all the groups, untreated areas were not affected. CONCLUSIONS SonoVue can substantially enhance the ablation effects of HIFU, suggesting that microbubble contrast agents may be useful for improving HIFU efficiency.
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Affiliation(s)
- Wen Luo
- Department of Ultrasound, Xijing Hospital, Fourth Military Medical University, Xi'an, China
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Luo W, Zhou X, Tian X, Ren X, Zheng M, Gu K, He G. Enhancement of ultrasound contrast agent in high-intensity focused ultrasound ablation. Adv Ther 2006; 23:861-8. [PMID: 17276954 DOI: 10.1007/bf02850207] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
High-intensity focused ultrasound (HIFU) is becoming an increasingly attractive modality for ablation. Enhancement of HIFU is an important issue that has been discussed and investigated worldwide. Ultrasound contrast agents are considered to constitute an efficient medium for changing acoustic characteristics and improving energy deposition in the focal region. The role of microbubbles in inducing enhanced heating, cavitation, and other related events in HIFU ablation has been investigated, with the goal of improving coagulation necrosis volume or decreasing acoustic power and exposure duration. Consequently, with the use of ultrasound contrast agents, applications of HIFU are expected to become more efficient, safe, and accurate and to produce fewer adverse effects. This paper reviews studies that have been conducted to investigate the enhancement of ultrasound contrast agents in HIFU ablation through experiments that were carried out in vitro and in vivo; an analysis of results of this enhancement mechanism is provided.
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Affiliation(s)
- Wen Luo
- Department of Ultrasound, Xijing Hospital, Fourth Military Medical University, Xi'an, China
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Yaqoob Z, Wu J, McDowell EJ, Heng X, Yang C. Methods and application areas of endoscopic optical coherence tomography. JOURNAL OF BIOMEDICAL OPTICS 2006; 11:063001. [PMID: 17212523 DOI: 10.1117/1.2400214] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
We review the current state of research in endoscopic optical coherence tomography (OCT). We first survey the range of available endoscopic optical imaging techniques. We then discuss the various OCT-based endoscopic methods that have thus far been developed. We compare the different endoscopic OCT methods in terms of their scan performance. Next, we examine the application range of endoscopic OCT methods. In particular, we look at the reported utility of the methods in digestive, intravascular, respiratory, urinary and reproductive systems. We highlight two additional applications--biopsy procedures and neurosurgery--where sufficiently compact OCT-based endoscopes can have significant clinical impacts.
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Affiliation(s)
- Zahid Yaqoob
- Engineering and Applied Sciences Division, Electrical Engineering Department, California Institute of Technology, Pasadena, California 91125, USA.
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Foley JL, Little JW, Vaezy S. Image-Guided High-Intensity Focused Ultrasound for Conduction Block of Peripheral Nerves. Ann Biomed Eng 2006; 35:109-19. [PMID: 17072498 DOI: 10.1007/s10439-006-9162-0] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2005] [Accepted: 07/10/2006] [Indexed: 11/26/2022]
Abstract
The objective of our work has been to investigate the use of ultrasound image-guided high-intensity focused ultrasound (HIFU) to non-invasively produce conduction block in rabbit sciatic nerves in vivo, a technique that could become a treatment of spasticity and pain. The work reported here involved the investigation of the duration of such conduction blocks after HIFU treatment and whether they resulted in axon degeneration. The right sciatic nerves of 12 rabbits were treated, under guidance of ultrasound imaging, with repeated 5-s applications of 3.2 MHz HIFU with in situ intensity of 1930 W/cm(2) (spatial-average, temporal-average) until conduction block was achieved. Survival endpoints were 0, 7, or 14 days after HIFU treatment, at which point the nerve conduction was assessed. Qualitative and quantitative histological analysis of nerve sections proximal and distal to the HIFU site was performed. Conduction block of all 12 nerves was achieved with average HIFU treatment time of 10.5+/-4.9 s (mean+/-SD). The volume of necrosis of adjacent muscle was measured to be 1.59+/-1.1 cm(3) (mean+/-SD). For all nerves, conduction block remained at the survival endpoint and the block resulted in degeneration of axons distal to the HIFU site, as confirmed by electrophysiological and histological methods. Potential clinical applications include treatment of spasticity in patients with spinal cord injury or pain in cancer patients.
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Affiliation(s)
- Jessica L Foley
- Department of Bioengineering, University of Washington, Box 355061, Seattle, WA 98195, USA
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Held RT, Zderic V, Nguyen TN, Vaezy S. Annular phased-array high-intensity focused ultrasound device for image-guided therapy of uterine fibroids. IEEE TRANSACTIONS ON ULTRASONICS, FERROELECTRICS, AND FREQUENCY CONTROL 2006; 53:335-48. [PMID: 16529108 DOI: 10.1109/tuffc.2006.1593372] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
An ultrasound (US), image-guided high-intensity focused ultrasound (HIFU) device was developed for noninvasive ablation of uterine fibroids. The HIFU device was an annular phased array, with a focal depth range of 30-60 mm, a natural focus of 50 mm, and a resonant frequency of 3 MHz. The in-house control software was developed to operate the HIFU electronics drive system for inducing tissue coagulation at different distances from the array. A novel imaging algorithm was developed to minimize the HIFU-induced noise in the US images. The device was able to produce lesions in bovine serum albumin-embedded polyacrylamide gels and excised pig liver. The lesions could be seen on the US images as hyperechoic regions. Depths ranging from 30 to 60 mm were sonicated at acoustic intensities of 4100 and 6100 W/cm2 for 15 s each, with the latter producing average lesion volumes at least 63% larger than the former. Tissue sonication patterns that began distal to the transducer produced longer lesions than those that began proximally. The variation in lesion dimensions indicates the possible development of HIFU protocols that increase HIFU throughput and shorten tumor treatment times.
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Affiliation(s)
- Robert Thomas Held
- Center for Industrial and Medical Ultrasound, Applied Physics Laboratory, University of Washington, Seattle, WA, USA.
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Frishman GN, Jurema MW. Myomas and myomectomy. J Minim Invasive Gynecol 2005; 12:443-56; quiz 457-8. [PMID: 16213434 DOI: 10.1016/j.jmig.2005.05.023] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2005] [Accepted: 05/13/2005] [Indexed: 10/25/2022]
Affiliation(s)
- Gary N Frishman
- Department of Obstetrics and Gynecology, Women & Infants' Hospital, Brown Medical School, Providence, Rhode Island 02905, USA.
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