The usefulness of mobile insulator sheets for the optimisation of deep heating area for regional hyperthermia using a capacitively coupled heating method: phantom, simulation and clinical prospective studies
| Autor: | Katsuya Yahara, Yukunori Korogi, Takayuki Ohguri, Kyosuke Tomura, Motohiro Murakami, Sota Nakahara, Hendrik Thijmen Mulder |
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| Přispěvatelé: | Radiation Oncology |
| Rok vydání: | 2017 |
| Předmět: |
Regional hyperthermia
Hyperthermia Cancer Research medicine.medical_specialty Materials science Phantoms Imaging Physiology Insulator (electricity) Hyperthermia Induced medicine.disease Niacin Salicylates Imaging phantom 030218 nuclear medicine & medical imaging Surgery 03 medical and health sciences 0302 clinical medicine 030220 oncology & carcinogenesis Physiology (medical) medicine Humans Prospective Studies Biomedical engineering Deep heating |
| Zdroj: | International Journal of Hyperthermia, 34(7), 1092-1103. Informa Healthcare |
| ISSN: | 1464-5157 0265-6736 |
| DOI: | 10.1080/02656736.2017.1402130 |
| Popis: | To evaluate the feasibility and efficacy of deep regional hyperthermia with the use of mobile insulator sheets in a capacitively coupled heating device.The heat was applied using an 8-MHz radiofrequency-capacitive device. The insulator sheet was inserted between the regular bolus and cooled overlay bolus in each of upper and lower side of the electrode. Several settings using the insulator sheets were investigated in an experimental study using an agar phantom to evaluate the temperature distributions. The specific absorption rate (SAR) distributions in several organs were also computed for the three-dimensional patient model. In a clinical prospective study, a total of five heating sessions were scheduled for the pelvic tumours, to assess the thermal parameters. The conventional setting was used during the first, third and fifth treatment sessions, and insulator sheets were used during the second and fourth treatment sessions.In the phantom study, the higher heating area improved towards the centre when the mobile insulator sheets were used. The subcutaneous fat/target ratios for the averaged SARs in the setting with the mobile insulator (median, 2.5) were significantly improved compared with those in the conventional setting (median, 3.4). In the clinical study, the thermal dose parameters of CEM43°CT90 in the sessions with the mobile insulator sheets (median, 1.9 min) were significantly better than those in the sessions using a conventional setting (median, 1.0 min).Our novel heating method using mobile insulator sheets was thus found to improve the thermal dose parameters. Further investigations are expected. |
| Databáze: | OpenAIRE |
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