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Sandilos G, Butchy MV, Koneru M, Gongalla S, Sensenig R, Hong YK. Histotripsy - hype or hope? Review of innovation and future implications. J Gastrointest Surg 2024:S1091-255X(24)00492-X. [PMID: 38862075 DOI: 10.1016/j.gassur.2024.05.038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/20/2024] [Revised: 05/18/2024] [Accepted: 05/31/2024] [Indexed: 06/13/2024]
Abstract
BACKGROUND Histotripsy is a novel, ultrasound-based ablative technique that was recently approved by the Food and Drug Administration for hepatic targets. It has several promising additional theoretical applications that need to be further investigated. Its basis as a nonthermal cavitational technology presents a unique advantage over existing thermal ablation techniques in maximizing local effects while minimizing adjacent tissue destruction. This review discusses the technical basis and current preclinical and clinical data surrounding histotripsy. METHODS This was a comprehensive review of the literature surrounding histotripsy and the clinical landscape of existing ablative techniques using the PubMed database. A technical summary of histotripsy's physics and cellular effect was described. Moreover, data from recent clinical trials, including Hope4Liver, and future implications regarding its application in various benign and malignant conditions were discussed. RESULTS Preclinical data demonstrated the efficacy of histotripsy ablation in various organ systems with minimal tissue destruction when examined at the histologic level. The first prospective clinical trial involving histotripsy in hepatocellular carcinoma and liver metastases, Hope4Liver, demonstrated a primary efficacy of 95.5% with minimal complications (6.8%). This efficacy was replicated in similar trials involving the treatment of benign prostatic hypertrophy. DISCUSSION In addition to the noninvasive ability to ablate lesions in the liver, histotripsy offers additional therapeutic potential. Early data suggest a potential complementary therapeutic effect when combining histotripsy with existing immunologic therapies because of the technology's theoretical ability to sensitize tumors to adaptive immunity. As with most novel therapies, the effect of histotripsy on the oncologic therapeutic landscape remains uncertain.
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Affiliation(s)
- Georgianna Sandilos
- Division of Surgical Oncology, Department of Surgery, Cooper University Hospital, Cooper University Health Care, Camden, NJ, United States
| | - Margaret Virginia Butchy
- Division of Surgical Oncology, Department of Surgery, Cooper University Hospital, Cooper University Health Care, Camden, NJ, United States
| | - Manisha Koneru
- Cooper Medical School of Rowan University, Camden, NJ, United States
| | - Shivsai Gongalla
- Cooper Medical School of Rowan University, Camden, NJ, United States
| | - Richard Sensenig
- Cooper Medical School of Rowan University, Camden, NJ, United States
| | - Young Ki Hong
- Division of Surgical Oncology, Department of Surgery, Cooper University Hospital, Cooper University Health Care, Camden, NJ, United States.
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Geevarghese R, Bodard S, Razakamanantsoa L, Marcelin C, Petre EN, Dohan A, Kastler A, Frandon J, Barral M, Soyer P, Cornelis FH. Interventional Oncology: 2024 Update. Can Assoc Radiol J 2024:8465371241236152. [PMID: 38444144 DOI: 10.1177/08465371241236152] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/07/2024] Open
Abstract
Interventional Oncology (IO) stands at the forefront of transformative cancer care, leveraging advanced imaging technologies and innovative interventions. This narrative review explores recent developments within IO, highlighting its potential impact facilitated by artificial intelligence (AI), personalized medicine and imaging innovations. The integration of AI in IO holds promise for accelerating tumour detection and characterization, guiding treatment strategies and refining predictive models. Imaging modalities, including functional MRI, PET and cone beam CT are reshaping imaging and precision. Navigation, fusion imaging, augmented reality and robotics have the potential to revolutionize procedural guidance and offer unparalleled accuracy. New developments are observed in embolization and ablative therapies. The pivotal role of genomics in treatment planning, targeted therapies and biomarkers for treatment response prediction underscore the personalization of IO. Quality of life assessment, minimizing side effects and long-term survivorship care emphasize patient-centred outcomes after IO treatment. The evolving landscape of IO training programs, simulation technologies and workforce competence ensures the field's adaptability. Despite barriers to adoption, synergy between interventional radiologists' proficiency and technological advancements hold promise in cancer care.
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Affiliation(s)
- Ruben Geevarghese
- Department of Radiology, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Sylvain Bodard
- Department of Radiology, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | | | - Clement Marcelin
- Department of Radiology, Bordeaux University, Hopital Pellegrin, Bordeaux, France
| | - Elena N Petre
- Department of Radiology, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Anthony Dohan
- Department of Radiology, Hopital Cochin, AP-HP, Paris, France
- Faculté de Médecine, Université Paris Cité, Paris, France
| | - Adrian Kastler
- Department of Radiology, Grenoble University Hospital, Grenoble, France
| | - Julien Frandon
- Department of Radiology, Nimes University Hospital, Nimes, France
| | - Matthias Barral
- Department of Radiology, Sorbonne University, Hopital Tenon, Paris, France
| | - Philippe Soyer
- Department of Radiology, Hopital Cochin, AP-HP, Paris, France
- Faculté de Médecine, Université Paris Cité, Paris, France
| | - Francois H Cornelis
- Department of Radiology, Memorial Sloan Kettering Cancer Center, New York, NY, USA
- Department of Radiology, Sorbonne University, Hopital Tenon, Paris, France
- Weill Cornell Medical College, New York, NY, USA
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LeBlang S, Ziemlewicz TJ. The art of histotripsy: a focused ultrasound application that has the potential to treat from head to toe! Int J Hyperthermia 2024; 41:2312608. [PMID: 38323559 DOI: 10.1080/02656736.2024.2312608] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2024] Open
Affiliation(s)
- Suzanne LeBlang
- Neuroradiologist, Director of Clinical Relationships-Focused Ultrasound Foundation, Charlottesville, VA, USA
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Verma Y, Arachchige ASPM. Revolutionizing cardiovascular care: the power of histotripsy. J Ultrasound 2024:10.1007/s40477-023-00848-7. [PMID: 38217765 DOI: 10.1007/s40477-023-00848-7] [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: 09/28/2023] [Accepted: 11/13/2023] [Indexed: 01/15/2024] Open
Abstract
Histotripsy, an innovative ultrasonic technique, is poised to transform the landscape of cardiovascular disease management. This review explores the multifaceted applications of histotripsy across various domains of cardiovascular medicine. In thrombolysis, histotripsy presents a non-invasive, drug-free, and precise method for recanalizing blood vessels obstructed by clots, minimizing the risk of vessel damage and embolism. Additionally, histotripsy showcases its potential in congenital heart defect management, offering a promising alternative to invasive procedures by creating intracardiac communications noninvasively. For patients with calcified aortic stenosis, histotripsy demonstrates its effectiveness in softening calcified bioprosthetic valves, potentially revolutionizing valve interventions. In the realm of arrhythmias, histotripsy could play an important role in scar-based ventricular tachycardia ablation, eliminating channel-like isthmuses of slowly conducting myocardium. Histotripsy`s potential applications also extend to structural heart interventions, enabling the safe sectioning of basal chordae and potentially addressing mitral regurgitation. Furthermore, it showcases its versatility by safely generating ventricular septal defects, providing a non-invasive means of creating intracardiac communications in neonates with congenital heart disease. Yet, most supporting studies are in-vitro or animal studies and there are possible challenges in translating experimental data on cardiac histotripsy to the clinical level. As histotripsy continues to evolve and mature, its remarkable potential in cardiovascular disease management holds promise for improving patient outcomes and reducing the burden of invasive procedures in the field of cardiology.
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Affiliation(s)
- Yash Verma
- Norfolk and Norwich University Hospital NHS Foundation Trust, Norwich, UK
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Hay AN, Vickers ER, Patwardhan M, Gannon J, Ruger L, Allen IC, Vlaisavljevich E, Tuohy J. Investigating cell death responses associated with histotripsy ablation of canine osteosarcoma. Int J Hyperthermia 2023; 40:2279027. [PMID: 38151477 PMCID: PMC10764077 DOI: 10.1080/02656736.2023.2279027] [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: 07/31/2023] [Accepted: 10/30/2023] [Indexed: 12/29/2023] Open
Abstract
BACKGROUND Osteosarcoma (OS) is the most frequently occurring primary bone tumor in dogs and people and innovative treatment options are profoundly needed. Histotripsy is an emerging tumor ablation modality, and it is essential for the clinical translation of histotripsy to gain knowledge about the outcome of nonablated tumor cells that could remain postablation. The objective of this study was to characterize the cell death genetic signature and proliferation response of canine OS cells post a near complete histotripsy ablation (96% ± 1.5) and to evaluate genetic cell death signatures associated with histotripsy ablation and OS in vivo. METHODS In the current study, we ablated three canine OS cell lines with a histotripsy dose that resulted in near complete ablation to allow for a viable tumor cell population for downstream analyses. To assess the in vivo cell death genetic signature, we characterized cell death genetic signature in histotripsy-ablated canine OS tumors collected 24-h postablation. RESULTS Differential gene expression changes observed in the 4% viable D17 and D418 cells, and histotripsy-ablated OS tumor samples, but not in Abrams cells, were associated with immunogenic cell death (ICD). The 4% viable OS cells demonstrated significantly reduced proliferation, compared to control OS cells, in vitro. CONCLUSION Histotripsy ablation of OS cell lines leads to direct and potentially indirect cell death as evident by, reduced proliferation in remaining viable OS cells and cell death genetic signatures suggestive of ICD both in vitro and in vivo.
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Affiliation(s)
- Alayna N. Hay
- Department of Small Animal Clinical Sciences, Virginia Maryland College of Veterinary Medicine, Blacksburg, VA, 24061
| | - Elliana R. Vickers
- Department of Small Animal Clinical Sciences, Virginia Maryland College of Veterinary Medicine, Blacksburg, VA, 24061
- Department of Biomedical Engineering and Mechanics, Virginia Tech, Blacksburg, VA 24061
- Graduate program in Translational, Biology, Medicine, and Health, Virginia Tech, Roanoke, VA, 24016
| | - Manali Patwardhan
- Department of Small Animal Clinical Sciences, Virginia Maryland College of Veterinary Medicine, Blacksburg, VA, 24061
- Graduate program in Translational, Biology, Medicine, and Health, Virginia Tech, Roanoke, VA, 24016
| | - Jessica Gannon
- Department of Biomedical Engineering and Mechanics, Virginia Tech, Blacksburg, VA 24061
| | - Lauren Ruger
- Department of Biomedical Engineering and Mechanics, Virginia Tech, Blacksburg, VA 24061
| | - Irving C. Allen
- Department of Biomedical Sciences and Pathobiology, Virginia Maryland College of Veterinary Medicine, Blacksburg, VA, 24061
| | - Eli Vlaisavljevich
- Department of Biomedical Engineering and Mechanics, Virginia Tech, Blacksburg, VA 24061
| | - Joanne Tuohy
- Department of Small Animal Clinical Sciences, Virginia Maryland College of Veterinary Medicine, Blacksburg, VA, 24061
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Dalzell CG, Taylor AC, White SB. New Insights on Liver-Directed Therapies in Hepatocellular Carcinoma. Cancers (Basel) 2023; 15:5749. [PMID: 38136295 PMCID: PMC10741466 DOI: 10.3390/cancers15245749] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2023] [Revised: 12/01/2023] [Accepted: 12/05/2023] [Indexed: 12/24/2023] Open
Abstract
The incidence of hepatocellular carcinoma (HCC) has been increasing over the past decades, but improvements in systemic and locoregional therapies is increasing survival. Current locoregional treatment options include ablation, transarterial chemoembolization (TACE), transarterial radioembolization (TARE), and stereotactic body radiotherapy (SBRT). There is ongoing research regarding the combination of systemic and local therapies to maximize treatment effect as well as in new non-invasive, image-guided techniques such as histotripsy. There is also active research in optimizing the delivery of therapy to tumors via nanostructures and viral-vector-mediated gene therapies. In many cases, patients require a combination of therapies to achieve tumor control and prolong survival. This article provides an overview of the most common liver-directed therapies for HCC as well as insight into more recent advances in personalized medicine and emerging techniques.
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Affiliation(s)
- Christina G. Dalzell
- Department of Radiology and Medical Imaging, Division of Vascular and Interventional Radiology, University of Virginia Health System, Charlottesville, VA 22903, USA
| | - Amy C. Taylor
- Department of Radiology and Medical Imaging, Division of Vascular and Interventional Radiology, University of Virginia Health System, Charlottesville, VA 22903, USA
| | - Sarah B. White
- Department of Radiology, Division of Vascular and Interventional Radiology, Medical College of Wisconsin, Milwaukee, WI 53226, USA
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Uppot RN, Wah TM, Mueller PR. Percutaneous treatment of renal tumours. J Med Imaging Radiat Oncol 2023; 67:853-861. [PMID: 37417722 DOI: 10.1111/1754-9485.13553] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2023] [Accepted: 06/15/2023] [Indexed: 07/08/2023]
Abstract
Image-guided ablation is an accepted treatment option in the management of renal cell carcinoma. Percutaneous renal ablation offers the possibility of minimally invasive treatment while attempting to preserve renal function. Over the past several years there have been advances in tools and techniques that have improved procedure safety and patient outcomes. This article provides an updated comprehensive review of percutaneous ablation in the management of renal cell carcinoma.
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Affiliation(s)
- Raul N Uppot
- Massachusetts General Hospital, Boston, Massachusetts, USA
- Department of Radiology, Harvard Medical School, Boston, Massachusetts, USA
| | - Tze Min Wah
- Department of Interventional Radiology, Faculty of Medicine, Leeds Institute of Medical Research, University of Leeds, Leeds, UK
- Leeds Teaching Hospitals NHS Trust, Leeds, UK
| | - Peter R Mueller
- Massachusetts General Hospital, Boston, Massachusetts, USA
- Department of Radiology, Harvard Medical School, Boston, Massachusetts, USA
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Rabei R, Fidelman N. Liver-Directed Therapy for Neuroendocrine Tumor Metastases in the Era of Peptide Receptor Radionuclide Therapy. Curr Treat Options Oncol 2023; 24:1994-2004. [PMID: 38100020 PMCID: PMC10781814 DOI: 10.1007/s11864-023-01152-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/19/2023] [Indexed: 01/11/2024]
Abstract
OPINION STATEMENT The treatment of neuroendocrine neoplasm (NEN) liver metastases involves a multidisciplinary approach that includes liver-directed therapies (LDT) and systemic treatments, such as peptide receptor radionuclide therapy (PRRT). LDT has demonstrated efficacy in rapidly reducing tumor bulk, improving symptoms, and delaying disease progression. Interventional radiologists should be consulted prior to switching therapy for patients with progressive or symptomatic neuroendocrine tumor liver metastases. Long-term follow-up data on the safety of Yttrium-90 radioembolization before and after PRRT remain limited. Therefore, a more conservative approach may be to preferentially employ transarterial embolization (TAE) or transarterial chemoembolization (TACE) for patients' somatostatin receptor-avid disease who may be future candidates for PRRT. Notable exceptions where radioembolization may be a preferred treatment strategy may be patients with history of biliary tract instrumentation, asymmetric unilobar disease distribution, and rapidly progressive diffuse liver involvement. Selection of local treatment modality, sequencing, and combination of LDT with systemic therapy require further investigation.
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Affiliation(s)
- Rana Rabei
- Department of Radiology and Biomedical Imaging, University of California San Francisco, 505 Parnassus Avenue, Room M-361, San Francisco, CA, 94143, USA
| | - Nicholas Fidelman
- Department of Radiology and Biomedical Imaging, University of California San Francisco, 505 Parnassus Avenue, Room M-361, San Francisco, CA, 94143, USA.
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Hay AN, Ruger L, Hsueh A, Vickers E, Klahn S, Vlaisavljevich E, Tuohy J. A review of the development of histotripsy for extremity tumor ablation with a canine comparative oncology model to inform human treatments. Int J Hyperthermia 2023; 40:2274802. [PMID: 37994796 PMCID: PMC10669778 DOI: 10.1080/02656736.2023.2274802] [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: 07/31/2023] [Accepted: 10/19/2023] [Indexed: 11/24/2023] Open
Abstract
Cancer is a devasting disease resulting in millions of deaths worldwide in both humans and companion animals, including dogs. Treatment of cancer is complex and challenging and therefore often multifaceted, as in the case of osteosarcoma (OS) and soft tissue sarcoma (STS). OS predominantly involves the appendicular skeleton and STS commonly develops in the extremities, resulting in treatment challenges due to the need to balance wide-margin resections to achieve local oncological control against the functional outcomes for the patient. To achieve wide tumor resection, invasive limb salvage surgery is often required, and the patient is at risk for numerous complications which can ultimately lead to impaired limb function and mobility. The advent of tumor ablation techniques offers the exciting potential of developing noninvasive or minimally invasive treatment options for extremity tumors. One promising innovative tumor ablation technique with strong potential to serve as a noninvasive limb salvage treatment for extremity tumor patients is histotripsy. Histotripsy is a novel, noninvasive, non-thermal, and non-ionizing focused ultrasound technique which uses controlled acoustic cavitation to mechanically disintegrate tissue with high precision. In this review, we present the ongoing development of histotripsy as a non-surgical alternative for extremity tumors and highlight the value of spontaneously occurring OS and STS in the pet dog as a comparative oncology research model to advance this field of histotripsy research.
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Affiliation(s)
- Alayna N. Hay
- Department of Small Animal Clinical Sciences, Virginia-Maryland College of Veterinary Medicine, Blacksburg, VA
- Virginia Tech Animal Cancer Care and Research Center, Virginia-Maryland College of Veterinary Medicine, Roanoke, VA
| | - Lauren Ruger
- Department of Biomedical Engineering and Mechanics, Virginia Polytechnic Institute and State University, Blacksburg, VA
| | - Andy Hsueh
- Department of Small Animal Clinical Sciences, Virginia-Maryland College of Veterinary Medicine, Blacksburg, VA
- Virginia Tech Animal Cancer Care and Research Center, Virginia-Maryland College of Veterinary Medicine, Roanoke, VA
| | - Elliana Vickers
- Department of Small Animal Clinical Sciences, Virginia-Maryland College of Veterinary Medicine, Blacksburg, VA
- Virginia Tech Animal Cancer Care and Research Center, Virginia-Maryland College of Veterinary Medicine, Roanoke, VA
- Department of Biomedical Engineering and Mechanics, Virginia Polytechnic Institute and State University, Blacksburg, VA
- Graduate program in Translation Biology, Medicine and Health, Virginia Polytechnic Institute and State University, Roanoke, VA
| | - Shawna Klahn
- Department of Small Animal Clinical Sciences, Virginia-Maryland College of Veterinary Medicine, Blacksburg, VA
- Virginia Tech Animal Cancer Care and Research Center, Virginia-Maryland College of Veterinary Medicine, Roanoke, VA
| | - Eli Vlaisavljevich
- Department of Biomedical Engineering and Mechanics, Virginia Polytechnic Institute and State University, Blacksburg, VA
| | - Joanne Tuohy
- Department of Small Animal Clinical Sciences, Virginia-Maryland College of Veterinary Medicine, Blacksburg, VA
- Virginia Tech Animal Cancer Care and Research Center, Virginia-Maryland College of Veterinary Medicine, Roanoke, VA
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Osada T, Jiang X, Zhao Y, Chen M, Kreager BC, Wu H, Kim H, Ren J, Snyder J, Zhong P, Morse MA, Lyerly HK. The use of histotripsy as intratumoral immunotherapy beyond tissue ablation-the rationale for exploring the immune effects of histotripsy. Int J Hyperthermia 2023; 40:2263672. [PMID: 37806666 DOI: 10.1080/02656736.2023.2263672] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2023] [Accepted: 09/20/2023] [Indexed: 10/10/2023] Open
Abstract
Mechanical high-intensity focused ultrasound (M-HIFU), which includes histotripsy, is a non-ionizing, non-thermal ablation technology that can be delivered by noninvasive methods. Because acoustic cavitation is the primary mechanism of tissue disruption, histotripsy is distinct from the conventional HIFU techniques resulting in hyperthermia and thermal injury. Phase I human trials have shown the initial safety and efficacy of histotripsy in treating patients with malignant liver tumors. In addition to tissue ablation, a promising benefit of M-HIFU has been stimulating a local and systemic antitumor immune response in preclinical models and potentially in the Phase I trial. Preclinical studies combining systemic immune therapies appear promising, but clinical studies of combinations have been complicated by systemic toxicities. Consequently, combining M-HIFU with systemic immunotherapy has been demonstrated in preclinical models and may be testing in future clinical studies. An additional alternative is to combine intratumoral M-HIFU and immunotherapy using microcatheter-placed devices to deliver both M-HIFU and immunotherapy intratumorally. The promise of M-HIFU as a component of anti-cancer therapy is promising, but as forms of HIFU are tested in preclinical and clinical studies, investigators should report not only the parameters of the energy delivered but also details of the preclinical models to enable analysis of the immune responses. Ultimately, as clinical trials continue, clinical responses and immune analysis of patients undergoing M-HIFU including forms of histotripsy will provide opportunities to optimize clinical responses and to optimize application and scheduling of M-HIFU in the context of the multi-modality care of the cancer patient.
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Affiliation(s)
- Takuya Osada
- Department of Surgery, Duke University School of Medicine, Duke University, Durham, NC, USA
| | - Xiaoning Jiang
- Department of Mechanical and Aerospace Engineering, College of Engineering, NC State University, Raleigh, NC, USA
| | | | - Mengyue Chen
- Department of Mechanical and Aerospace Engineering, College of Engineering, NC State University, Raleigh, NC, USA
| | - Benjamin C Kreager
- Department of Mechanical and Aerospace Engineering, College of Engineering, NC State University, Raleigh, NC, USA
| | - Huaiyu Wu
- Department of Mechanical and Aerospace Engineering, College of Engineering, NC State University, Raleigh, NC, USA
| | - Howuk Kim
- Department of Mechanical Engineering, School of Engineering, Inha University, Incheon, Republic of South Korea
| | - Jun Ren
- Department of Surgery, Duke University School of Medicine, Duke University, Durham, NC, USA
| | - Joshua Snyder
- Department of Surgery and Cell Biology, Duke University School of Medicine, Duke University, Durham, NC, USA
| | - Pei Zhong
- Thomas Lord Department of Mechanical Engineering and Material Science, Pratt School of Engineering, Duke University, Durham, NC, USA
| | - Michael A Morse
- Department of Medicine, Duke University School of Medicine, Duke University, Durham, NC, USA
| | - H Kim Lyerly
- Department of Surgery, Pathology, and Integrative Immunobiology, Duke University School of Medicine, Duke University, Durham, NC, USA
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Trivedi VV, Wallach EL, Bader KB, Shekhar H. Contrast-Enhanced Imaging of Histotripsy Bubble Clouds Using Chirp-Coded Excitation and Volterra Filtering. IEEE TRANSACTIONS ON ULTRASONICS, FERROELECTRICS, AND FREQUENCY CONTROL 2023; 70:989-998. [PMID: 37379172 DOI: 10.1109/tuffc.2023.3289918] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/30/2023]
Abstract
Histotripsy is a focused ultrasound therapy that ablates tissue via bubble cloud activity. Real-time ultrasound image guidance is used to ensure safe and effective treatment. Plane-wave imaging enables tracking of histotripsy bubble clouds at a high frame rate but lacks adequate contrast. Furthermore, bubble cloud hyperechogenicity is reduced in abdominal targets, making the development of contrast-specific sequences for deep-seated targets an active area of research. Chirp-coded subharmonic imaging was reported previously to enhance histotripsy bubble cloud detection by a modest 4-6 dB compared to the conventional sequence. Incorporating additional steps into the signal processing pipeline could enhance bubble cloud detection and tracking. In this study, we evaluated the feasibility of combining chirp-coded subharmonic imaging with Volterra filtering for enhancing bubble cloud detection in vitro. Chirped imaging pulses were used to track bubble clouds generated in scattering phantoms at a 1-kHz frame rate. Fundamental and subharmonic matched filters were applied to the received radio frequency signals, followed by a tuned Volterra filter to extract bubble-specific signatures. For subharmonic imaging, the application of the quadratic Volterra filter improved the contrast-to-tissue ratio from 5.18 ± 1.29 to 10.90 ± 3.76 dB, relative to the application of the subharmonic matched filter. These findings demonstrate the utility of the Volterra filter for histotripsy image guidance.
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