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De Maio A, Alfieri G, Mattone M, Ghanouni P, Napoli A. High-Intensity Focused Ultrasound Surgery for Tumor Ablation: A Review of Current Applications. Radiol Imaging Cancer 2024; 6:e230074. [PMID: 38099828 PMCID: PMC10825716 DOI: 10.1148/rycan.230074] [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: 05/26/2023] [Revised: 11/05/2023] [Accepted: 11/09/2023] [Indexed: 12/18/2023]
Abstract
The management of cancer with alternative approaches is a matter of clinical interest worldwide. High-intensity focused ultrasound (HIFU) surgery is a noninvasive technique performed under US or MRI guidance. The most studied therapeutic uses of HIFU involve thermal tissue ablation, demonstrating both palliative and curative potential. However, concurrent mechanical bioeffects also provide opportunities in terms of augmented drug delivery and immunosensitization. The safety and efficacy of HIFU integration with current cancer treatment strategies are being actively investigated in managing primary and secondary tumors, including cancers of the breast, prostate, pancreas, liver, kidney, and bone. Current primary HIFU indications are pain palliation, complete ablation of localized earlystage tumors, or debulking of unresectable late-stage cancers. This review presents the latest HIFU applications, from investigational to clinically approved, in the field of tumor ablation. Keywords: Ultrasound, Ultrasound-High Intensity Focused (HIFU), Interventional-MSK, Interventional-Body, Oncology, Technology Assessment, Tumor Response, MR Imaging © RSNA, 2023.
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Affiliation(s)
- Alessandro De Maio
- From the Department of Radiological, Pathological, and Oncological
Sciences, Sapienza University of Rome, viale Regina Elena 324, 00100 Rome, Italy
(A.D.M., G.A., M.M., A.N.); and Department of Radiology, Stanford University,
Stanford, Calif (P.G.)
| | - Giulia Alfieri
- From the Department of Radiological, Pathological, and Oncological
Sciences, Sapienza University of Rome, viale Regina Elena 324, 00100 Rome, Italy
(A.D.M., G.A., M.M., A.N.); and Department of Radiology, Stanford University,
Stanford, Calif (P.G.)
| | - Monica Mattone
- From the Department of Radiological, Pathological, and Oncological
Sciences, Sapienza University of Rome, viale Regina Elena 324, 00100 Rome, Italy
(A.D.M., G.A., M.M., A.N.); and Department of Radiology, Stanford University,
Stanford, Calif (P.G.)
| | - Pejman Ghanouni
- From the Department of Radiological, Pathological, and Oncological
Sciences, Sapienza University of Rome, viale Regina Elena 324, 00100 Rome, Italy
(A.D.M., G.A., M.M., A.N.); and Department of Radiology, Stanford University,
Stanford, Calif (P.G.)
| | - Alessandro Napoli
- From the Department of Radiological, Pathological, and Oncological
Sciences, Sapienza University of Rome, viale Regina Elena 324, 00100 Rome, Italy
(A.D.M., G.A., M.M., A.N.); and Department of Radiology, Stanford University,
Stanford, Calif (P.G.)
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Khanmohammadi S, Noroozi A, Yekaninejad MS, Rezaei N. Cryoablation for the Palliation of Painful Bone Metastasis: A Systematic Review. Cardiovasc Intervent Radiol 2023; 46:1469-1482. [PMID: 36631660 DOI: 10.1007/s00270-022-03356-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/28/2022] [Accepted: 12/28/2022] [Indexed: 01/13/2023]
Abstract
BACKGROUND Cryoablation is a minimally invasive procedure to treat painful bone metastases in patients with cancer. We designed a systematic review to understand the safety and effects of cryoablation on the pain and quality of life (QoL) of cancer patients. METHOD We searched PubMed, ISI, Cochrane library, and Scopus databases using the keywords "Cryoablation," "Pain," and "Bone metastasis." Inclusion criteria were: (1) Original studies published until September 8, 2022; (2) studies on patients over 18 years and affected by bone metastasis; (3) bone metastasis treated with stand-alone cryoablation; (4) studies reporting patients' pain before and at least one time-point following cryoablation; and (5) English-language studies. RESULTS We screened 696 articles. Fifteen studies on 376 patients were included. Time points for pain assessment ranged from 1 day to 6 months. Spine was the most frequent treated location. All studies reported a significant pain reduction between 1 day and 6 months after the cryoablation procedure. The highest mean difference between pre- and post-procedure scores was 5.8 (VAS scale) after 4 weeks. The overall rate of minor and major complications was 12.74%. Cryoablation improved the QoL of cancer patients and decreased the need for analgesics. CONCLUSION Cryoablation is a safe and useful procedure for palliating painful bone metastasis and increasing the QoL of cancer patients. Future studies should adopt a standardized pain reporting scale to allow for meta-analysis.
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Affiliation(s)
- Shaghayegh Khanmohammadi
- Research Center for Immunodeficiencies, Children's Medical Center, Tehran University of Medical Sciences, Qarib St., Keshavarz Blvd., Tehran, Iran
- Network of Immunity in Infection, Malignancy and Autoimmunity (NIIMA), Universal Scientific Education and Research Network (USERN), Tehran, Iran
| | | | - Mir Saeed Yekaninejad
- Department of Epidemiology and Biostatistics, School of Public Health, Tehran University of Medical Sciences, Poursina St., Keshavarz Blvd., Tehran, Iran.
| | - Nima Rezaei
- Research Center for Immunodeficiencies, Children's Medical Center, Tehran University of Medical Sciences, Qarib St., Keshavarz Blvd., Tehran, Iran.
- Network of Immunity in Infection, Malignancy and Autoimmunity (NIIMA), Universal Scientific Education and Research Network (USERN), Tehran, Iran.
- Department of Immunology, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran.
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Slotman DJ, Bartels MMTJ, Ferrer CJ, Bos C, Bartels LW, Boomsma MF, Phernambucq ECJ, Nijholt IM, Morganti AG, Siepe G, Buwenge M, Grüll H, Bratke G, Yeo SY, Blanco Sequeiros R, Minn H, Huhtala M, Napoli A, De Felice F, Catalano C, Bazzocchi A, Gasperini C, Campanacci L, Simões Corrêa Galendi J, Müller D, Braat MNGJA, Moonen C, Verkooijen HM. Focused Ultrasound and RadioTHERapy for non-invasive palliative pain treatment in patients with bone metastasis: a study protocol for the three armed randomized controlled FURTHER trial. Trials 2022; 23:1061. [PMID: 36582001 PMCID: PMC9798627 DOI: 10.1186/s13063-022-06942-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2022] [Accepted: 11/17/2022] [Indexed: 12/30/2022] Open
Abstract
BACKGROUND Cancer-induced bone pain (CIBP), caused by bone metastases, is a common complication of cancer and strongly impairs quality of life (QoL). External beam radiotherapy (EBRT) is the current standard of care for treatment of CIBP. However, approximately 45% of patients have no adequate pain response after EBRT. Magnetic resonance image-guided high-intensity focused ultrasound (MR-HIFU) may improve pain palliation in this patient population. The main objective of this trial was to compare MR-HIFU, EBRT, and MR-HIFU + EBRT for the palliative treatment of bone metastases. METHODS/DESIGN The FURTHER trial is an international multicenter, three-armed randomized controlled trial. A total of 216 patients with painful bone metastases will be randomized in a 1:1:1 ratio to receive EBRT only, MR-HIFU only, or combined treatment with EBRT followed by MR-HIFU. During a follow-up period of 6 months, patients will be contacted at eight time points to retrieve information about their level of pain, QoL, and the occurrence of (serious) adverse events. The primary outcome of the trial is pain response at 14 days after start of treatment. Secondary outcomes include pain response at 14 days after trial enrolment, pain scores (daily until the 21st day and at 4, 6, 12 and 24 weeks), toxicity, adverse events, QoL, and survival. Cost-effectiveness and cost-utility analysis will be conducted. DISCUSSION The FURTHER trial aims to evaluate the effectiveness and cost-effectiveness of MR-HIFU-alone or in combination with EBRT-compared to EBRT to relieve CIBP. The trial will be performed in six hospitals in four European countries, all of which are partners in the FURTHER consortium. TRIAL REGISTRATION The FURTHER trial is registered under the Netherlands Trials Register number NL71303.041.19 and ClinicalTrials.gov registration number NCT04307914. Date of trial registration is 13-01-2020.
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Affiliation(s)
- Derk J. Slotman
- grid.7692.a0000000090126352Division of Imaging and Oncology, University Medical Centre Utrecht, Utrecht, The Netherlands ,grid.452600.50000 0001 0547 5927Department of Radiology, Isala Hospital, Zwolle, The Netherlands
| | - Marcia M. T. J. Bartels
- grid.7692.a0000000090126352Division of Imaging and Oncology, University Medical Centre Utrecht, Utrecht, The Netherlands
| | - Cyril J. Ferrer
- grid.7692.a0000000090126352Division of Imaging and Oncology, University Medical Centre Utrecht, Utrecht, The Netherlands
| | - Clemens Bos
- grid.7692.a0000000090126352Division of Imaging and Oncology, University Medical Centre Utrecht, Utrecht, The Netherlands
| | - Lambertus W. Bartels
- grid.7692.a0000000090126352Division of Imaging and Oncology, University Medical Centre Utrecht, Utrecht, The Netherlands
| | - Martijn F. Boomsma
- grid.7692.a0000000090126352Division of Imaging and Oncology, University Medical Centre Utrecht, Utrecht, The Netherlands ,grid.452600.50000 0001 0547 5927Department of Radiology, Isala Hospital, Zwolle, The Netherlands
| | - Erik C. J. Phernambucq
- grid.452600.50000 0001 0547 5927Department of Radiation Oncology, Isala Hospital, Zwolle, The Netherlands
| | - Ingrid M. Nijholt
- grid.452600.50000 0001 0547 5927Department of Radiology, Isala Hospital, Zwolle, The Netherlands
| | - Alessio G. Morganti
- grid.6292.f0000 0004 1757 1758DIMES, Alma Mater Studiorum - Bologna University, Bologna, Italy ,grid.6292.f0000 0004 1757 1758Radiation Oncology, IRCCS Azienda Ospedaliero-Universitaria Di Bologna, Bologna, Italy
| | - Giambattista Siepe
- grid.6292.f0000 0004 1757 1758Radiation Oncology, IRCCS Azienda Ospedaliero-Universitaria Di Bologna, Bologna, Italy
| | - Milly Buwenge
- grid.6292.f0000 0004 1757 1758DIMES, Alma Mater Studiorum - Bologna University, Bologna, Italy
| | - Holger Grüll
- grid.6190.e0000 0000 8580 3777Institute of Diagnostic and Interventional Radiology, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
| | - Grischa Bratke
- grid.6190.e0000 0000 8580 3777Institute of Diagnostic and Interventional Radiology, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
| | - Sin Yuin Yeo
- grid.6190.e0000 0000 8580 3777Institute of Diagnostic and Interventional Radiology, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
| | - Roberto Blanco Sequeiros
- grid.410552.70000 0004 0628 215XDepartment of Radiology, Turku University Hospital, Turku, Finland
| | - Heikki Minn
- grid.1374.10000 0001 2097 1371Department of Oncology, University of Turku and Turku University Hospital, Turku, Finland
| | - Mira Huhtala
- grid.1374.10000 0001 2097 1371Department of Oncology, University of Turku and Turku University Hospital, Turku, Finland
| | - Alessandro Napoli
- grid.7841.aDepartment of Radiological, Oncological and Pathological Sciences, Sapienza University of Rome, Rome, Italy
| | - Francesca De Felice
- grid.7841.aDepartment of Radiological, Oncological and Pathological Sciences, Sapienza University of Rome, Rome, Italy
| | - Carlo Catalano
- grid.7841.aDepartment of Radiological, Oncological and Pathological Sciences, Sapienza University of Rome, Rome, Italy
| | - Alberto Bazzocchi
- grid.419038.70000 0001 2154 6641Diagnostic and Interventional Radiology, IRCCS Istituto Ortopedico Rizzoli, Bologna, Italy
| | - Chiara Gasperini
- grid.419038.70000 0001 2154 6641Diagnostic and Interventional Radiology, IRCCS Istituto Ortopedico Rizzoli, Bologna, Italy
| | - Laura Campanacci
- grid.419038.70000 0001 2154 66413Rd Orthopaedic and Traumatologic Clinic Prevalently Oncologic, IRCCS Istituto Ortopedico Rizzoli, Bologna, Italy
| | - Julia Simões Corrêa Galendi
- grid.6190.e0000 0000 8580 3777Institute of Health Economics and Clinical Epidemiology, Faculty of Medicine and University Hospital of Cologne, University of Cologne, Cologne, Germany
| | - Dirk Müller
- grid.6190.e0000 0000 8580 3777Institute of Health Economics and Clinical Epidemiology, Faculty of Medicine and University Hospital of Cologne, University of Cologne, Cologne, Germany
| | - Manon N. G. J. A. Braat
- grid.7692.a0000000090126352Division of Imaging and Oncology, University Medical Centre Utrecht, Utrecht, The Netherlands
| | - Chrit Moonen
- grid.7692.a0000000090126352Division of Imaging and Oncology, University Medical Centre Utrecht, Utrecht, The Netherlands
| | - Helena M. Verkooijen
- grid.7692.a0000000090126352Division of Imaging and Oncology, University Medical Centre Utrecht, Utrecht, The Netherlands
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Yeo SY, Bratke G, Grüll H. High Intensity Focused Ultrasound for Treatment of Bone Malignancies-20 Years of History. Cancers (Basel) 2022; 15:cancers15010108. [PMID: 36612105 PMCID: PMC9817683 DOI: 10.3390/cancers15010108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2022] [Revised: 12/12/2022] [Accepted: 12/13/2022] [Indexed: 12/28/2022] Open
Abstract
High Intensity Focused Ultrasound (HIFU) is the only non-invasive method for percutaneous thermal ablation of tissue, with treatments typically performed either under magnetic resonance imaging or ultrasound guidance. Since this method allows efficient heating of bony structures, it has found not only early use in treatment of bone pain, but also in local treatment of malignant bone tumors. This review of 20 years of published studies shows that HIFU is a very efficient method for rapid pain relief, can provide local tumor control and has a very patient-friendly safety profile.
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Affiliation(s)
- Sin Yuin Yeo
- Institute of Diagnostic and Interventional Radiology, Faculty of Medicine and University Hospital of Cologne, University of Cologne, Kerpener Str. 62, 50937 Cologne, Germany
- Correspondence:
| | - Grischa Bratke
- Institute of Diagnostic and Interventional Radiology, Faculty of Medicine and University Hospital of Cologne, University of Cologne, Kerpener Str. 62, 50937 Cologne, Germany
| | - Holger Grüll
- Institute of Diagnostic and Interventional Radiology, Faculty of Medicine and University Hospital of Cologne, University of Cologne, Kerpener Str. 62, 50937 Cologne, Germany
- Department of Chemistry, Faculty of Mathematics and Natural Sciences, University of Cologne, Greinstr. 6, 50939 Cologne, Germany
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Lakomy DS, Yang J, Vedam S, Wang J, Lee B, Sobremonte A, Castillo P, Hughes N, Mohammadsaid M, Jhingran A, Klopp AH, Choi S, Fuller CD, Lin LL. Clinical implementation and initial experience with a 1.5 Tesla MR-linac for MR-guided radiotherapy for gynecologic cancer: An R-IDEAL stage 1/2a first in humans/feasibility study of new technology implementation. Pract Radiat Oncol 2022; 12:e296-e305. [PMID: 35278717 DOI: 10.1016/j.prro.2022.03.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Revised: 02/23/2022] [Accepted: 03/01/2022] [Indexed: 10/18/2022]
Abstract
PURPOSE Magnetic resonance imaging-guided linear accelerator systems (MR-linacs) can facilitate the daily adaptation of radiotherapy plans. Here, we report our early clinical experience using an MR-linac for adaptive radiotherapy of gynecologic malignancies. METHODS AND MATERIALS Treatments were planned with an Elekta Monaco v5.4.01 and delivered by a 1.5 Tesla Elekta Unity MR-linac. The system offers a choice of daily adaptation based on either position (ATP) or shape (ATS) of the tumor and surrounding normal structures. The ATS approach has the option of manually editing the contours of tumors and surrounding normal structures before the plan is adapted. Here we documented the duration of each treatment fraction; set-up variability (assessed by isocenter shifts in each plan) between fractions; and, for quality assurance, calculated the percentage of plans meeting the γ-criterion of 3%/3-mm distance to agreement. Deformable accumulated dose calculations were used to compare accumulated versus planned dose for patient treated with exclusively ATP fractions. RESULTS Of the 10 patients treated with 90 fractions on the MR-linac, most received boost doses to recurrence in nodes or isolated tumors. Each treatment fraction lasted a median 32 minutes; fractions were shorter with ATP than with ATS (30 min vs 42 min, P<0.0001). The γ criterion for all fraction plans exceeded >90% (median 99.9%, range 92.4%-100%), i.e., all plans passed quality assurance testing. The average extent of isocenter shift was <0.5 cm in each axis. The accumulated dose to the gross tumor volume was within 5% of the reference plan for all ATP cases. Accumulated doses for lesions in the pelvic periphery were within <1% of the reference plan as opposed to -1.6% to -4.4% for central pelvic tumors. CONCLUSIONS The MR-linac is a reliable and clinically feasible tool for treating patients with gynecologic cancer.
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Affiliation(s)
- David S Lakomy
- Departments of Radiation Oncology; Dartmouth Geisel School of Medicine, Hanover, NH, USA
| | - Jinzhong Yang
- Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Sastry Vedam
- Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Jihong Wang
- Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Belinda Lee
- Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Angela Sobremonte
- Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Pamela Castillo
- Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Neil Hughes
- Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Mustefa Mohammadsaid
- Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
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Mohanty S, Fidder RJ, Matos PM, Heunis CM, Kaya M, Blanken N, Misra S. SonoTweezer: An Acoustically Powered End-Effector for Underwater Micromanipulation. IEEE TRANSACTIONS ON ULTRASONICS, FERROELECTRICS, AND FREQUENCY CONTROL 2022; 69:988-997. [PMID: 34990355 DOI: 10.1109/tuffc.2022.3140745] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Recent advances in contactless micromanipulation strategies have revolutionized prospects of robotic manipulators as next-generation tools for minimally invasive surgeries. In particular, acoustically powered phased arrays offer dexterous means of manipulation both in air and water. Inspired by these phased arrays, we present SonoTweezer: a compact, low-power, and lightweight array of immersible ultrasonic transducers capable of trapping and manipulation of sub-mm sized agents underwater. Based on a parametric investigation with numerical pressure field simulations, we design and create a six-transducer configuration, which is small compared to other reported multi-transducer arrays (16-256 elements). Despite the small size of array, SonoTweezer can reach pressure magnitudes of 300 kPa at a low supply voltage of 25 V to the transducers, which is in the same order of absolute pressure as multi-transducer arrays. Subsequently, we exploit the compactness of our array as an end-effector tool for a robotic manipulator to demonstrate long-range actuation of sub-millimeter agents over a hundred times the agent's body length. Furthermore, a phase-modulation over its individual transducers allows our array to locally maneuver its target agents at sub-mm steps. The ability to manipulate agents underwater makes SonoTweezer suitable for clinical applications considering water's similarity to biological media, e.g., vitreous humor and blood plasma. Finally, we show trapping and manipulation of micro-agents under medical ultrasound (US) imaging modality. This application of our actuation strategy combines the usage of US waves for both imaging and micromanipulation.
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Simões Corrêa Galendi J, Yeo SY, Simic D, Grüll H, Stock S, Müller D. A time-driven activity-based costing approach of magnetic resonance-guided high-intensity focused ultrasound for cancer-induced bone pain. Int J Hyperthermia 2022; 39:173-180. [PMID: 35021942 DOI: 10.1080/02656736.2021.2023768] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
Abstract
OBJECTIVE To determine resource consumption and total costs for providing magnetic resonance-guided high-intensity focused ultrasound (MR-HIFU) treatment to a patient with cancer-induced bone pain (CIBP). METHODS We conducted a time-driven activity-based costing (TD-ABC) of MR-HIFU treatments for CIBP from a hospital perspective. A European care-pathway (including a macro-, meso-, and micro-level) was designed to incorporate the care-delivery value chain. Time estimates were obtained from medical records and from prospective direct observations. To calculate the capacity cost rate, data from the controlling department of a German university hospital were allocated to the modules of the care pathway. Best- and worst-case scenarios were calculated by applying lower and upper bounds of time measurements. RESULTS The macro-level care pathway consisted of eight modules (i.e., outpatient consultations, pretreatment imaging, preparation, optimization, sonication, post-treatment, recovery, and anesthesia). The total cost of an MR-HIFU treatment amounted to €5147 per patient. Best- and worst-case scenarios yielded a total cost of €4092 and to €5876. According to cost categories, costs due to equipment accounted for 41% of total costs, followed by costs with personnel (32%), overhead (16%) and materials (11%). CONCLUSION MR-HIFU is an emerging noninvasive treatment for alleviating CIBP, with increasing evidence on treatment efficacy. This costing study can support MR-HIFU reimbursement negotiations and facilitate the adoption of MR-HIFU as first-line treatment for CIBP. The present TD-ABC model creates the opportunity of benchmarking the provision of MR-HIFU to bone tumor.Key pointsMagnetic resonance-guided high-intensity focused ultrasound (MR-HIFU) is an emerging noninvasive treatment modality for alleviating cancer-induced bone pain (CIBP).From a hospital perspective, the total cost of MR-HIFU amounted to €5147 per treatment.This time-driven activity-based costing model creates the opportunity of benchmarking the provision of MR-HIFU to bone tumor.
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Affiliation(s)
- Julia Simões Corrêa Galendi
- Faculty of Medicine and University Hospital of Cologne, Institute of Health Economics and Clinical Epidemiology, University of Cologne, Cologne, Germany
| | - Sin Yuin Yeo
- Faculty of Medicine and University Hospital of Cologne, Institute of Diagnostic and Interventional Radiology, University of Cologne, Cologne, Germany
| | - Dusan Simic
- Faculty of Medicine and University Hospital of Cologne, Institute of Health Economics and Clinical Epidemiology, University of Cologne, Cologne, Germany
| | - Holger Grüll
- Faculty of Medicine and University Hospital of Cologne, Institute of Diagnostic and Interventional Radiology, University of Cologne, Cologne, Germany.,Department of Chemistry, Faculty of Mathematics and Natural Sciences, University of Cologne, Cologne, Germany
| | - Stephanie Stock
- Faculty of Medicine and University Hospital of Cologne, Institute of Health Economics and Clinical Epidemiology, University of Cologne, Cologne, Germany
| | - Dirk Müller
- Faculty of Medicine and University Hospital of Cologne, Institute of Health Economics and Clinical Epidemiology, University of Cologne, Cologne, Germany
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