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M'Rad Y, Charbonnier C, de Oliveira ME, Guillemin PC, Crowe LA, Kössler T, Poletti PA, Boudabbous S, Ricoeur A, Salomir R, Lorton O. Computer-Aided Intra-Operatory Positioning of an MRgHIFU Applicator Dedicated to Abdominal Thermal Therapy Using Particle Swarm Optimization. IEEE OPEN JOURNAL OF ENGINEERING IN MEDICINE AND BIOLOGY 2024; 5:524-533. [PMID: 39050977 PMCID: PMC11268946 DOI: 10.1109/ojemb.2024.3410118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2023] [Revised: 04/30/2024] [Accepted: 05/29/2024] [Indexed: 07/27/2024] Open
Abstract
PURPOSE Transducer positioning for liver ablation by magnetic resonance-guided high-intensity focused ultrasound (MRgHIFU) is challenging due to the presence of air-filled organs or bones on the beam path. This paper presents a software tool developed to optimize the positioning of a HIFU transducer dedicated to abdominal thermal therapy, to maximize the treatment's efficiency while minimizing the near-field risk. METHODS A software tool was developed to determine the theoretical optimal position (TOP) of the transducer based on the minimization of a cost function using the particle swarm optimization (PSO). After an initialization phase and a manual segmentation of the abdomen of 5 pigs, the program randomly generates particles with 2 degrees of freedom and iteratively minimizes the cost function of the particles considering 3 parameters weighted according to their criticality. New particles are generated around the best position obtained at the previous step and the process is repeated until the optimal position of the transducer is reached. MR imaging data from in vivo HIFU ablation in pig livers was used for ground truth comparison between the TOP and the experimental position (EP). RESULTS As compared to the manual EP, the rotation difference with the TOP was on average -3.1 ± 7.1° and the distance difference was on average -7.1 ± 5.4 mm. The computational time to suggest the TOP was 20s. The software tool is modulable and demonstrated consistency and robustness when repeating the calculation and changing the initial position of the transducer.
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Affiliation(s)
- Yacine M'Rad
- University of Geneva, Faculty of MedicineImage Guided Interventions Laboratory (GR-949)CH-1211GenevaSwitzerland
| | | | | | - Pauline Coralie Guillemin
- University of Geneva, Faculty of MedicineImage Guided Interventions Laboratory (GR-949)CH-1211GenevaSwitzerland
| | | | - Thibaud Kössler
- University Hopsitals of GenevaOncology Department1205GenevaSwitzerland
| | | | - Sana Boudabbous
- University of Geneva, Faculty of MedicineImage Guided Interventions Laboratory (GR-949)CH-1211GenevaSwitzerland
- University Hospitals of GenevaRadiology Department1205GenevaSwitzerland
| | - Alexis Ricoeur
- University of Geneva, Faculty of MedicineImage Guided Interventions Laboratory (GR-949)CH-1211GenevaSwitzerland
- University Hospitals of GenevaRadiology Department1205GenevaSwitzerland
| | - Rares Salomir
- University of Geneva, Faculty of MedicineImage Guided Interventions Laboratory (GR-949)CH-1211GenevaSwitzerland
- University Hospitals of GenevaRadiology Department1205GenevaSwitzerland
| | - Orane Lorton
- University of Geneva, Faculty of MedicineImage Guided Interventions Laboratory (GR-949)CH-1211GenevaSwitzerland
- University Hospitals of GenevaRadiology Department1205GenevaSwitzerland
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Zhou Y, Gong X, You Y. In vivo evaluation of focused ultrasound ablation surgery (FUAS)-induced coagulation using echo amplitudes of the therapeutic focused ultrasound transducer. Int J Hyperthermia 2024; 41:2325477. [PMID: 38439505 DOI: 10.1080/02656736.2024.2325477] [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: 01/15/2024] [Accepted: 02/26/2024] [Indexed: 03/06/2024] Open
Abstract
OBJECTIVE Monitoring sensitivity of sonography in focused ultrasound ablation surgery (FUAS) is limited (no hyperechoes in ∼50% of successful coagulation in uterine fibroids). A more accurate and sensitive approach is required. METHOD The echo amplitudes of the focused ultrasound (FUS) transducer in a testing mode (short pulse duration and low power) were found to correlate with the ex vivo coagulation. To further evaluate its coagulation prediction capabilities, in vivo experiments were carried out. The liver, kidney, and leg muscles of three adult goats were treated using clinical FUAS settings, and the echo amplitude of the FUS transducer and grayscale in sonography before and after FUAS were collected. On day 7, animals were sacrificed humanely, and the treated tissues were dissected to expose the lesion. Echo amplitude changes and lesion areas were analyzed statistically, as were the coagulation prediction metrics. RESULTS The echo amplitude changes of the FUS transducer correlate well with the lesion areas in the liver (R = 0.682). Its prediction in accuracy (94.4% vs. 50%), sensitivity (92.9% vs. 35.7%), and negative prediction (80% vs. 30.8%) is better than sonography, but similar in specificity (80% vs. 100%) and positive prediction (100% vs. 100%). In addition, the correlation between tissue depth and the lesion area is not good (|R| < 0.2). Prediction performances in kidney and leg muscles are similar. CONCLUSION The FUS echo amplitudes are sensitive to the tissue properties and their changes after FUAS. They are sensitive and reliable in evaluating and predicting FUAS outcomes.
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Affiliation(s)
- Yufeng Zhou
- State Key Laboratory of Ultrasound in Medicine and Engineering, College of Biomedical Engineering, Chongqing Medical University, Chongqing, China
- Chongqing Key Laboratory of Biomedical Engineering, Chongqing Medical University, Chongqing, China
- National Medical Products Administration (NMPA) Key Laboratory for Quality Evaluation of Ultrasonic Surgical Equipment, Wuhan, Hubei, China
| | - Xiaobo Gong
- Research and Development, National Engineering Research Center of Ultrasound Medicine, Chongqing, China
| | - Yaqing You
- Research and Development, National Engineering Research Center of Ultrasound Medicine, Chongqing, China
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Kaiser CRW, Tuma AB, Zebarjadi M, Zachs DP, Organ AJ, Lim HH, Collins MN. Rib detection using pitch-catch ultrasound and classification algorithms for a novel ultrasound therapy device. Bioelectron Med 2023; 9:25. [PMID: 37964380 PMCID: PMC10647025 DOI: 10.1186/s42234-023-00127-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2023] [Accepted: 10/02/2023] [Indexed: 11/16/2023] Open
Abstract
BACKGROUND Noninvasive ultrasound (US) has been used therapeutically for decades, with applications in tissue ablation, lithotripsy, and physical therapy. There is increasing evidence that low intensity US stimulation of organs can alter physiological and clinical outcomes for treatment of health disorders including rheumatoid arthritis and diabetes. One major translational challenge is designing portable and reliable US devices that can be used by patients in their homes, with automated features to detect rib location and aid in efficient transmission of energy to organs of interest. This feasibility study aimed to assess efficacy in rib bone detection without conventional imaging, using a single channel US pitch-catch technique integrated into an US therapy device to detect pulsed US reflections from ribs. METHODS In 20 healthy volunteers, the location of the ribs and spleen were identified using a diagnostic US imaging system. Reflected ultrasound signals were recorded at five positions over the spleen and adjacent ribs using the therapy device. Signals were classified as between ribs (intercostal), partially over a rib, or fully over a rib using four models: threshold-based time domain classification, threshold-based frequency domain classification, logistic regression, and support vector machine (SVM). RESULTS SVM performed best overall on the All Participants cohort with accuracy up to 96.25%. All models' accuracies were improved by separating participants into two cohorts based on Body Mass Index (BMI) and re-fitting each model. After separation into Low BMI and High BMI cohorts, a simple time-thresholding approach achieved accuracies up to 100% and 93.75%, respectively. CONCLUSION These results demonstrate that US reflection signal classification can accurately provide low complexity, real-time automated onboard rib detection and user feedback to advance at-home therapeutic US delivery.
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Affiliation(s)
- Claire R W Kaiser
- Department of Biomedical Engineering, University of Minnesota, 312 Church St. SE 7-105 Nils Hasselmo Hall, Minneapolis, MN, 55455, USA.
| | - Adam B Tuma
- Department of Otolaryngology-Head and Neck Surgery, University of Minnesota, Phillips Wangensteen Building, 516 Delaware St SE, Suite 8-240, Minneapolis, MN, 55455, USA
| | - Maryam Zebarjadi
- Department of Otolaryngology-Head and Neck Surgery, University of Minnesota, Phillips Wangensteen Building, 516 Delaware St SE, Suite 8-240, Minneapolis, MN, 55455, USA
| | - Daniel P Zachs
- Department of Otolaryngology-Head and Neck Surgery, University of Minnesota, Phillips Wangensteen Building, 516 Delaware St SE, Suite 8-240, Minneapolis, MN, 55455, USA
| | - Anna J Organ
- Department of Otolaryngology-Head and Neck Surgery, University of Minnesota, Phillips Wangensteen Building, 516 Delaware St SE, Suite 8-240, Minneapolis, MN, 55455, USA
| | - Hubert H Lim
- Department of Biomedical Engineering, University of Minnesota, 312 Church St. SE 7-105 Nils Hasselmo Hall, Minneapolis, MN, 55455, USA
- Department of Otolaryngology-Head and Neck Surgery, University of Minnesota, Phillips Wangensteen Building, 516 Delaware St SE, Suite 8-240, Minneapolis, MN, 55455, USA
| | - Morgan N Collins
- Department of Otolaryngology-Head and Neck Surgery, University of Minnesota, Phillips Wangensteen Building, 516 Delaware St SE, Suite 8-240, Minneapolis, MN, 55455, USA
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Zubair M, Adams MS, Diederich CJ. An endoluminal cylindrical sectored-ring ultrasound phased-array applicator for minimally-invasive therapeutic ultrasound. Med Phys 2023; 50:1-19. [PMID: 36413363 PMCID: PMC9870260 DOI: 10.1002/mp.16113] [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: 07/07/2022] [Revised: 11/10/2022] [Accepted: 11/10/2022] [Indexed: 11/24/2022] Open
Abstract
BACKGROUND The size of catheter-based ultrasound devices for delivering ultrasound energy to deep-seated tumors is constrained by the access pathway which limits their therapeutic capabilities. PURPOSE To devise and investigate a deployable applicator suitable for minimally-invasive delivery of therapeutic ultrasound, consisting of a 2D cylindrical sectored-ring ultrasound phased array, integrated within an expandable paraboloid-shaped balloon-based reflector. The balloon can be collapsed for compact delivery and expanded close to the target position to mimic a larger-diameter concentric-ring sector-vortex array for enhanced dynamic control of focal depth and volume. METHODS Acoustic and biothermal simulations were employed in 3D generalized homogeneous and patient-specific heterogeneous models, for three-phased array transducers with 32, 64, and 128 elements, composed of sectored 4, 8, and 16 tubular ring transducers, respectively. The applicator performance was characterized as a function of array configuration, focal depth, phasing modes, and balloon reflector geometry. A 16-element proof-of-concept phased array applicator assembly, consisting of four tubular transducers each divided into four sectors, was fabricated, and characterized with hydrophone measurements along and across the axis, and ablations in ex vivo tissue. RESULTS Simulation results indicated that transducer arrays (1.5 MHz, 9 mm OD × 20 mm long), balloon sizes (41-50 mm expanded diameter, 20-60 mm focal depth), phasing mode (0-4) and sonication duration (30 s) can produce spatially localized acoustic intensity focal patterns (focal length: 3-22 mm, focal width: 0.7-8.7 mm) and ablative thermal lesions (width: 2.7-16 mm, length: 6-46 mm) in pancreatic tissue across a 10-90 mm focal depth range. Patient-specific studies indicated that 0.1, 0.46, and 1.2 cm3 volume of tumor can be ablated in the body of the pancreas for 120 s sonications using a single axial focus (Mode 0), or four, and eight simultaneous foci in a toroidal pattern (Mode 2 and 4, respectively). Hydrophone measurements demonstrated good agreement with simulation. Experiments in which chicken meat was thermally ablated indicated that volumetric ablation can be produced using single or multiple foci. CONCLUSIONS The results of this study demonstrated the feasibility of a novel compact ultrasound applicator design capable of focusing, deep penetration, electronic steering, and volumetric thermal ablation. The proposed applicator can be used for compact endoluminal or laparoscopic delivery of localized ultrasound energy to deep-seated targets.
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Affiliation(s)
- Muhammad Zubair
- Department of Radiation Oncology University of California San Francisco USA
| | - Matthew S. Adams
- Department of Radiation Oncology University of California San Francisco USA
| | - Chris J. Diederich
- Department of Radiation Oncology University of California San Francisco USA
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Chan H, Chang HY, Lin WL, Chen GS. Large-Volume Focused-Ultrasound Mild Hyperthermia for Improving Blood-Brain Tumor Barrier Permeability Application. Pharmaceutics 2022; 14:pharmaceutics14102012. [PMID: 36297445 PMCID: PMC9610093 DOI: 10.3390/pharmaceutics14102012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2022] [Revised: 09/17/2022] [Accepted: 09/20/2022] [Indexed: 11/16/2022] Open
Abstract
Mild hyperthermia can locally enhance permeability of the blood-tumor barrier in brain tumors, improving delivery of antitumor nanodrugs. However, a clinical transcranial focused ultrasound (FUS) system does not provide this modality yet. The study aimed at the development of the transcranial FUS technique dedicated for large-volume mild hyperthermia in the brain. Acoustic pressure, multiple-foci, temperature and thermal dose induced by FUS were simulated in the brain through the skull. A 1-MHz, 114-element, spherical helmet transducer was fabricated to verify large-volume hyperthermia in the phantom. The simulated results showed that two foci were simultaneously formed at (2, 0, 0) and (−2, 0, 0) and at (0, 2, 0) and (0, −2, 0), using the phases of focusing pattern 1 and the phases of focusing pattern 2, respectively. Switching two focusing patterns at 5 Hz produced a hyperthermic zone with an ellipsoid of 7 mm × 6 mm × 11 mm in the brain and the temperature was 41–45 °C in the ellipsoid as the maximum intensity was 150 W/cm2 and sonication time was 3 min. The phased array driven by switching two mode phases generated a 41 °C-contour region of 10 ± 1 mm × 8 ± 2 mm × 13 ± 2 mm in the phantom after 3-min sonication. Therefore, we have demonstrated our developed FUS technique for large-volume mild hyperthermia.
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Affiliation(s)
- Hsin Chan
- Institute of Biomedical Engineering, National Taiwan University, Taipei 100, Taiwan
| | - Hsin-Yun Chang
- Institute of Biomedical Engineering and Nanomedicine, National Health Research Institutes, Miaoli 35053, Taiwan
| | - Win-Li Lin
- Institute of Biomedical Engineering, National Taiwan University, Taipei 100, Taiwan
| | - Gin-Shin Chen
- Institute of Biomedical Engineering and Nanomedicine, National Health Research Institutes, Miaoli 35053, Taiwan
- Institute of Biomedical Engineering, National Yang Ming Chiao Tung University, Hsinchu 300, Taiwan
- Correspondence: ; Tel.: +886-37-206166 (ext. 37108)
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Zhang Q, Mao J, Zhang Y, Lu M, Li R, Liu X, Liu Y, Yang R, Wang X, Geng Y, Qi T, Wan M. Multiple-Focus Patterns of Sparse Random Array Using Particle Swarm Optimization for Ultrasound Surgery. IEEE TRANSACTIONS ON ULTRASONICS, FERROELECTRICS, AND FREQUENCY CONTROL 2022; 69:565-579. [PMID: 34757903 DOI: 10.1109/tuffc.2021.3127222] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
This study aims to investigate the feasibility and potential of sparse random arrays driven by the particle swarm optimization (PSO) algorithm to generate multiple-focus patterns and a large scanning range without grating lobes, which extends the scanning range of focused ultrasound in the treatment of brain tumors, opening the blood-brain barrier, and neuromodulation. Operating at 1.1 MHz, a random spherical array with 200 square elements (sparseness 58%) and a sparse random array with 660 square elements (sparseness 41%) driven by PSO are employed to simulate different focus patterns. With the same radius of curvature and diameter of transducer and element size, the scanning range of the off-axis single focus of a random 200-element array is two times that of an ordinary array using symmetric arrangement. The focal volume of multiple-focus patterns of the random array is 18 times that of the single focus. The single focus of the sparse random array with 660 elements could steer up to ±23 mm in the radial direction, without grating lobes. The maximum distance between two foci in a multiple-focus "S"-shaped deflection is approximately 25 mm. Simulation results illustrate the capability of a focused beam steered in 3-D space. Multiple-focus patterns could significantly increase the focal volume and shorten the treatment time for large target volumes. Simulation results show the feasibility and potential of the method combining PSO with a sparse random array to generate flexible focus patterns that can adapt to different needs in different tissue treatments.
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Zubair M, Adams MS, Diederich CJ. Deployable ultrasound applicators for endoluminal delivery of volumetric hyperthermia. Int J Hyperthermia 2021; 38:1188-1204. [PMID: 34376103 DOI: 10.1080/02656736.2021.1936216] [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: 10/20/2022] Open
Abstract
PURPOSE To investigate the design of an endoluminal deployable ultrasound applicator for delivering volumetric hyperthermia to deep tissue sites as a possible adjunct to radiation and chemotherapy. METHOD This study considers an ultrasound applicator consisting of two tubular transducers situated at the end of a catheter assembly, encased within a distensible conical shaped balloon-based reflector that redirects acoustic energy distally into the tissue. The applicator assembly can be inserted endoluminally or laparoscopically in a compact form and expanded after delivery to the target site. Comprehensive acoustic and biothermal simulations and parametric studies were employed in generalized 3D and patient-specific pancreatic head and body tumor models to characterize the acoustic performance and evaluate heating capabilities of the applicator by investigating the device at a range of operating frequencies, tissue acoustic and thermal properties, transducer configurations, power modulation, applicator positioning, and by analyzing the resultant 40, 41, and 43 °C isothermal volumes and penetration depth of the heating volume. Intensity distributions and volumetric temperature contours were calculated to define moderate hyperthermia boundaries. RESULTS Parametric studies demonstrated the frequency selection to control volume and depth of therapeutic heating from 62 to 22 cm3 and 4 to 2.6 cm as frequency ranges from 1 MHz to 4.7 MHz, respectively. Width of the heating profile tracks closely with the aperture. Water cooling within the reflector balloon was effective in controlling temperature to 37 °C maximum within the luminal wall. Patient-specific studies indicated that applicators with extended OD in the range of 3.6-6.2 cm with 0.5-1 cm long and 1 cm OD transducers can heat volumes of 1.1-7 cm3, 3-26 cm3, and 3.3-37.4 cm3 of pancreatic body and head tumors above 43, 41, and 40 °C, respectively. CONCLUSION In silico studies demonstrated the feasibility of combining endoluminal ultrasound with an integrated expandable balloon reflector for delivering volumetric hyperthermia in regions adjacent to body lumens and cavities.
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Affiliation(s)
- Muhammad Zubair
- Thermal Therapy Research Group, Department of Radiation Oncology, University of California San Francisco, San Francisco, CA, USA
| | - Matthew S Adams
- Thermal Therapy Research Group, Department of Radiation Oncology, University of California San Francisco, San Francisco, CA, USA
| | - Chris J Diederich
- Thermal Therapy Research Group, Department of Radiation Oncology, University of California San Francisco, San Francisco, CA, USA
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