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Namakshenas P, Di Matteo FM, Bianchi L, Faiella E, Stigliano S, Quero G, Saccomandi P. Optimization of laser dosimetry based on patient-specific anatomical models for the ablation of pancreatic ductal adenocarcinoma tumor. Sci Rep 2023; 13:11053. [PMID: 37422486 PMCID: PMC10329695 DOI: 10.1038/s41598-023-37859-7] [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: 10/25/2022] [Accepted: 06/28/2023] [Indexed: 07/10/2023] Open
Abstract
Laser-induced thermotherapy has shown promising potential for the treatment of unresectable primary pancreatic ductal adenocarcinoma tumors. Nevertheless, heterogeneous tumor environment and complex thermal interaction phenomena that are established under hyperthermic conditions can lead to under/over estimation of laser thermotherapy efficacy. Using numerical modeling, this paper presents an optimized laser setting for Nd:YAG laser delivered by a bare optical fiber (300 µm in diameter) at 1064 nm working in continuous mode within a power range of 2-10 W. For the thermal analysis, patient-specific 3D models were used, consisting of tumors in different portions of the pancreas. The optimized laser power and time for ablating the tumor completely and producing thermal toxic effects on the possible residual tumor cells beyond the tumor margins were found to be 5 W for 550 s, 7 W for 550 s, and 8 W for 550 s for the pancreatic tail, body, and head tumors, respectively. Based on the results, during the laser irradiation at the optimized doses, thermal injury was not evident either in the 15 mm lateral distances from the optical fiber or in the nearby healthy organs. The present computational-based predictions are also in line with the previous ex vivo and in vivo studies, hence, they can assist in the estimation of the therapeutic outcome of laser ablation for pancreatic neoplasms prior to clinical trials.
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Affiliation(s)
- Pouya Namakshenas
- Department of Mechanical Engineering, Politecnico di Milano, 20156, Milan, Italy
| | | | - Leonardo Bianchi
- Department of Mechanical Engineering, Politecnico di Milano, 20156, Milan, Italy
| | - Eliodoro Faiella
- Radiology Unit, Fondazione Policlinico Universitario Campus Biomedico, Rome, Italy
| | - Serena Stigliano
- Operative Endoscopy Department, Fondazione Policlinico Universitario Campus Biomedico, Rome, Italy
| | - Giuseppe Quero
- Pancreatic Surgery Unit, Gemelli Pancreatic Advanced Research Center (CRMPG), Fondazione Policlinico Universitario Agostino Gemelli IRCCS di Roma, Rome, Italy
- Università Cattolica del Sacro Cuore di Roma, 00168, Rome, Italy
| | - Paola Saccomandi
- Department of Mechanical Engineering, Politecnico di Milano, 20156, Milan, Italy.
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Hübner F, Blauth S, Leithäuser C, Schreiner R, Siedow N, Vogl TJ. Validating a simulation model for laser-induced thermotherapy using MR thermometry. Int J Hyperthermia 2022; 39:1315-1326. [PMID: 36220179 DOI: 10.1080/02656736.2022.2129102] [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: 10/17/2022] Open
Abstract
OBJECTIVES We want to investigate whether temperature measurements obtained from MR thermometry are accurate and reliable enough to aid the development and validation of simulation models for Laser-induced interstitial thermotherapy (LITT). METHODS Laser-induced interstitial thermotherapy (LITT) is applied to ex-vivo porcine livers. An artificial blood vessel is used to study the cooling effect of large blood vessels in proximity to the ablation zone. The experimental setting is simulated using a model based on partial differential equations (PDEs) for temperature, radiation, and tissue damage. The simulated temperature distributions are compared to temperature data obtained from MR thermometry. RESULTS The overall agreement between measurement and simulation is good for two of our four test cases, while for the remaining cases drift problems with the thermometry data have been an issue. At higher temperatures local deviations between simulation and measurement occur in close proximity to the laser applicator and the vessel. This suggests that certain aspects of the model may need some refinement. CONCLUSION Thermometry data is well-suited for aiding the development of simulations models since it shows where refinements are necessary and enables the validation of such models.
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Affiliation(s)
- Frank Hübner
- Institute for Diagnostic and Interventional Radiology of the J.W. Goethe University Hospital, Frankfurt am Main, Germany
| | | | | | - Roland Schreiner
- Institute for Diagnostic and Interventional Radiology of the J.W. Goethe University Hospital, Frankfurt am Main, Germany
| | | | - Thomas J Vogl
- Institute for Diagnostic and Interventional Radiology of the J.W. Goethe University Hospital, Frankfurt am Main, Germany
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Alaghemandi M, Salehi L, Samolis P, Trachtenberg BT, Turnali A, Sander MY, Sharifzadeh S. Atomic understanding of structural deformations upon ablation of graphene. NANO SELECT 2021. [DOI: 10.1002/nano.202000248] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Affiliation(s)
- Mohammad Alaghemandi
- Department of Electrical and Computer Engineering Boston University Boston Massachusetts USA
| | - Leili Salehi
- Department of Electrical and Computer Engineering Boston University Boston Massachusetts USA
| | - Panagis Samolis
- Department of Electrical and Computer Engineering Boston University Boston Massachusetts USA
| | | | - Ahmet Turnali
- Department of Electrical and Computer Engineering Boston University Boston Massachusetts USA
| | - Michelle Y. Sander
- Department of Electrical and Computer Engineering Boston University Boston Massachusetts USA
- Division of Materials Science and Engineering Boston University Boston Massachusetts USA
- Department of Biomedical Engineering Boston University Boston Massachusetts USA
| | - Sahar Sharifzadeh
- Department of Electrical and Computer Engineering Boston University Boston Massachusetts USA
- Division of Materials Science and Engineering Boston University Boston Massachusetts USA
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Nazmdeh H, Vahabi M, Nazari MA. Finite element modeling of Non-Fourier heat transfer in a cancerous tissue with an injected fat layer during hyperthermia treatment. J Therm Biol 2021; 100:103073. [PMID: 34503810 DOI: 10.1016/j.jtherbio.2021.103073] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2021] [Revised: 06/11/2021] [Accepted: 08/04/2021] [Indexed: 11/30/2022]
Abstract
Hyperthermia technique has received much attention over the last decade being less invasive among the others. Laser therapy is among the most commonly investigated types of ablative hyperthermia for treatment of cancer. In this method an external heat source provided by a laser fiber leads the cancerous tissue to the necrosis stage. For its simulation a cylindrical geometry of a breast tissue containing a tumor is acted upon by a Gaussian form of laser radiation. Then the feasibility of a fat layer injection around the tumor during the therapy is investigated numerically. In order to consider the finite speed of heat transfer, dual phase lag (DPL) model is implemented for prediction of the thermal results. The therapy is addressed with and without the presence of a fat layer around the breast tumor. Results show that the temperature in the tumor increases up to 15 % by the injection of a fat layer. Also, the presence of a fat layer around the tumor shows that the irreversible ablation happens at a faster rate.
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Affiliation(s)
- Hossein Nazmdeh
- Department of Biomedical Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Mohammad Vahabi
- Department of Mechanical Engineering, College of Engineering, Central Tehran Branch, Islamic Azad University, Tehran, Iran.
| | - Mohammad Ali Nazari
- Department of Mechanical Engineering, College of Engineering, University of Tehran, Tehran, Iran
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Namakshenas P, Mojra A. Optimization of polyethylene glycol-based hydrogel rectal spacer for focal laser ablation of prostate peripheral zone tumor. Phys Med 2021; 89:104-113. [PMID: 34364254 DOI: 10.1016/j.ejmp.2021.07.034] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/02/2021] [Revised: 07/23/2021] [Accepted: 07/28/2021] [Indexed: 11/29/2022] Open
Abstract
PURPOSE Focal Laser ablation therapy is a technique that exposes the prostate tumor to hyperthermia ablation and eradicates cancerous cells. However, due to the excessive heating generated by laser irradiation, there is a possibility of damage to the adjacent healthy tissues. This paper through in silico study presents a novel approach to reduce collateral effects due to heating by the placement of polyethylene glycol (PEG) spacer between the rectum and tumor during laser irradiation. The PEG spacer thickness is optimized to reduce the undesired damage at common laser power used in the clinical trials. Our study also encompasses novelty by conducting the thermal analysis based on the porous structure of prostate tumor. METHODS The thermal parameters and two thermal phase lags between the temperature gradient and the heat flux, are determined by considering the vascular network of prostate tumor. The Nelder-Mead algorithm is applied to find the minimum thickness of the PEG spacer. RESULTS In the absence of the spacer, the predicted results for the laser power of 4 W, 8 W, and 12 W show that the temperature of the rectum rises up to 58.6 °C, 80.4 °C, and 101.1 °C, while through the insertion of 2.59 mm, 4 mm, and 4.9 mm of the PEG spacer, it dramatically reduces below 42 °C. CONCLUSIONS The results can be used as a guideline to ablate the prostate tumors while avoiding undesired damage to the rectal wall during laser irradiation, especially for the peripheral zone tumors.
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Affiliation(s)
- Pouya Namakshenas
- Department of Mechanical Engineering, K. N. Toosi University of Technology, Tehran, Iran
| | - Afsaneh Mojra
- Department of Mechanical Engineering, K. N. Toosi University of Technology, Tehran, Iran.
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Mohammadi A, Bianchi L, Korganbayev S, De Landro M, Saccomandi P. Thermomechanical Modeling of Laser Ablation Therapy of Tumors: Sensitivity Analysis and Optimization of Influential Variables. IEEE Trans Biomed Eng 2021; 69:302-313. [PMID: 34181533 DOI: 10.1109/tbme.2021.3092889] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
In cancer treatment, laser ablation is a promising technique used to induce localized thermal damage. Different variables influence the temperature distribution in the tissue and the resulting therapy efficacy; thus, the optimal therapy settings are required for obtaining the desired clinical outcome. In this work, thermomechanical modeling of contactless laser ablation was implemented to analyze the sensitivity of independent variables on the optimal treatment conditions. The Finite Element Method was utilized to solve the governing equations, i.e., the bioheat, mechanical deformation, and the Navier-Stokes equations. Validation of the model was evaluated by comparing experimental and simulated temperatures, which indicated high accuracy for estimating temperature. In particular, the results showed that the model is capable of estimating temperature with a good correlation factor (R=0.98) and low Mean Absolute Error (3.9 C). A sensitivity analysis based on laser irradiation time, power, beam distribution, and the blood vessel depth on temperature distribution and fraction of necrotic tissue was performed. Based on the most significant variables i.e., laser irradiation time and power, an optimization process was performed. This resulted into an indication of the optimal therapy settings for achieving maximum procedure efficiency i.e., the required fraction of necrotic tissue within the target volume, constituted by tumor and safety margins around it.
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Mohammadi A, Bianchi L, Asadi S, Saccomandi P. Measurement of Ex Vivo Liver, Brain and Pancreas Thermal Properties as Function of Temperature. SENSORS (BASEL, SWITZERLAND) 2021; 21:4236. [PMID: 34205567 PMCID: PMC8235733 DOI: 10.3390/s21124236] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/06/2021] [Revised: 06/04/2021] [Accepted: 06/17/2021] [Indexed: 12/11/2022]
Abstract
The ability to predict heat transfer during hyperthermal and ablative techniques for cancer treatment relies on understanding the thermal properties of biological tissue. In this work, the thermal properties of ex vivo liver, pancreas and brain tissues are reported as a function of temperature. The thermal diffusivity, thermal conductivity and volumetric heat capacity of these tissues were measured in the temperature range from 22 to around 97 °C. Concerning the pancreas, a phase change occurred around 45 °C; therefore, its thermal properties were investigated only until this temperature. Results indicate that the thermal properties of the liver and brain have a non-linear relationship with temperature in the investigated range. In these tissues, the thermal properties were almost constant until 60 to 70 °C and then gradually changed until 92 °C. In particular, the thermal conductivity increased by 100% for the brain and 60% for the liver up to 92 °C, while thermal diffusivity increased by 90% and 40%, respectively. However, the heat capacity did not significantly change in this temperature range. The thermal conductivity and thermal diffusivity were dramatically increased from 92 to 97 °C, which seems to be due to water vaporization and state transition in the tissues. Moreover, the measurement uncertainty, determined at each temperature, increased after 92 °C. In the temperature range of 22 to 45 °C, the thermal properties of pancreatic tissue did not change significantly, in accordance with the results for the brain and liver. For the three tissues, the best fit curves are provided with regression analysis based on measured data to predict the tissue thermal behavior. These curves describe the temperature dependency of tissue thermal properties in a temperature range relevant for hyperthermia and ablation treatments and may help in constructing more accurate models of bioheat transfer for optimization and pre-planning of thermal procedures.
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Affiliation(s)
| | | | | | - Paola Saccomandi
- Department of Mechanical Engineering, Politecnico di Milano, 20156 Milan, Italy; (A.M.); (L.B.); (S.A.)
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Amini S, Ahmadikia H. New approach of controlling the area affected in brain tumour treatment by LITT. Comput Methods Biomech Biomed Engin 2021; 24:1221-1227. [PMID: 33427501 DOI: 10.1080/10255842.2020.1870966] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
There are some techniques to ablate tumours of brain, breast and liver. One of them is laser irradiation. The most important problem of this technique is to injure noncancerous tissues. It is a challenging work to control the domain of laser effects. In other words, it is hard to ablate cancerous tissue without ablating noncancerous. To gain this goal, some researchers have been proposed some ways, such as using two or three applicators or moving applicator. The objective of this paper is to present an approach to control the temperature distribution and heat affected zone in brain tumours when irradiated by shielded laser beam, 1064 nm ND-YAG. The effects of laser beam, resulting in tissue temperature increasing, follows the border of tumour by defining of a dual intensity distribution. This is included two distinct intensity distributions of laser on the applicator by shielding. Treatment of an arbitrary topology of tumour will be simulated irradiation of laser by two different distributions through numerical method. Results show when dual distribution on the tumour border is used, the pattern of photon distribution is coincident by the tumour and the affected zone and temperature increasing follows the borderline of tumour, qualitatively. It shows that the ablated volume of tumour will be 53% more than when the unique distribution is used and the treatment time is shorter, resultantly.
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Affiliation(s)
- Sadegh Amini
- Mechanical Engineering Department, University of Isfahan, Isfahan, Iran
| | - Hossein Ahmadikia
- Mechanical Engineering Department, University of Isfahan, Isfahan, Iran
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Ashikbayeva Z, Aitkulov A, Jelbuldina M, Issatayeva A, Beisenova A, Molardi C, Saccomandi P, Blanc W, Inglezakis VJ, Tosi D. Distributed 2D temperature sensing during nanoparticles assisted laser ablation by means of high-scattering fiber sensors. Sci Rep 2020; 10:12593. [PMID: 32724053 PMCID: PMC7387462 DOI: 10.1038/s41598-020-69384-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2020] [Accepted: 07/10/2020] [Indexed: 12/13/2022] Open
Abstract
The high demand in effective and minimally invasive cancer treatments, namely thermal ablation, leads to the demand for real-time multi-dimensional thermometry to evaluate the treatment effectiveness, which can be also assisted by the use of nanoparticles. We report the results of 20-nm gold and magnetic iron oxide nanoparticles-assisted laser ablation on a porcine liver phantom. The experimental set-up consisting of high-scattering nanoparticle-doped fibers was operated by means of a scattering-level multiplexing arrangement and interrogated via optical backscattered reflectometry, together with a solid-state laser diode operating at 980 nm. The multiplexed 2-dimensional fiber arrangement based on nanoparticle-doped fibers allowed an accurate superficial thermal map detected in real-time.
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Affiliation(s)
- Zhannat Ashikbayeva
- School of Engineering and Digital Sciences, Nazarbayev University, 53 Kabanbay Batyr Ave, 010000, Nur-Sultan, Kazakhstan.
- PI National Laboratory Astana, Nazarbayev University, 53 Kabanbay Batyr Ave, 010000, Nur-Sultan, Kazakhstan.
| | - Arman Aitkulov
- School of Engineering and Digital Sciences, Nazarbayev University, 53 Kabanbay Batyr Ave, 010000, Nur-Sultan, Kazakhstan
| | - Madina Jelbuldina
- School of Engineering and Digital Sciences, Nazarbayev University, 53 Kabanbay Batyr Ave, 010000, Nur-Sultan, Kazakhstan
| | - Aizhan Issatayeva
- School of Engineering and Digital Sciences, Nazarbayev University, 53 Kabanbay Batyr Ave, 010000, Nur-Sultan, Kazakhstan
| | - Aidana Beisenova
- School of Engineering and Digital Sciences, Nazarbayev University, 53 Kabanbay Batyr Ave, 010000, Nur-Sultan, Kazakhstan
| | - Carlo Molardi
- School of Engineering and Digital Sciences, Nazarbayev University, 53 Kabanbay Batyr Ave, 010000, Nur-Sultan, Kazakhstan
| | - Paola Saccomandi
- Department of Mechanical Engineering, Politecnico Di Milano, Via Giuseppe La Masa 1, 20156, Milan, Italy
| | - Wilfried Blanc
- CNRS, INPHYNI, UMR 7010, Université Côte D'Azur, Parc Valrose, 06108, Nice, France
| | - Vassilis J Inglezakis
- School of Engineering and Digital Sciences, Nazarbayev University, 53 Kabanbay Batyr Ave, 010000, Nur-Sultan, Kazakhstan
- Department of Chemical and Process Engineering, University of Strathclyde, 75 Montrose Street, Glasgow, G1 1XJ, UK
| | - Daniele Tosi
- School of Engineering and Digital Sciences, Nazarbayev University, 53 Kabanbay Batyr Ave, 010000, Nur-Sultan, Kazakhstan
- PI National Laboratory Astana, Nazarbayev University, 53 Kabanbay Batyr Ave, 010000, Nur-Sultan, Kazakhstan
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