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The position of the opposite flat applicator changes the SAR and thermal distributions of the RF capacitive intracavitary hyperthermia.

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Title: The position of the opposite flat applicator changes the SAR and thermal distributions of the RF capacitive intracavitary hyperthermia.
Authors: Hiraki, Y., Nakajo, M., Takeshita, T., Churei, H.
Source: International Journal of Hyperthermia. May/Jun2000, Vol. 16 Issue 3, p193-203. 11p. 3 Black and White Photographs, 3 Diagrams, 1 Chart, 2 Graphs.
Subjects: Heat radiation & absorption, Cancer thermotherapy
Abstract: The variations of the specific absorption rate (SAR) and thermal distribution in the JSHO QA phantoms were investigated by radiofrequency (RF) capacitive intracavitary hyperthermia (ICHT) applicator (AP-T01, Omron Electric Co., Kyoto, Japan) with the changing position of the opposite flat applicator (15-cm in diameter). The thermal distribution was observed with the thermographic camera and the normalized SAR distribution was calculated with the thermal data that were measured with the thermocouple thermometers. The SAR and thermal distributions of AP-T01 significantly varied with the position of the opposite flat applicator. The slope of the normalized SAR became gradual towards the side of the flat applicator. During the operating of a high flow rate (1500ml/min) cooling system, the region between AP-T01 and the flat applicator was widely and rather homogeneously heated, except the hot spot around the end of AP-T01. This hot spot may be due to the imbalance of cooling of AP-T01 and the warming-up of the electrode. These results suggest that the RF capacitive ICHT using AP-T01 may be clinically effective on the deep-seated tumours in the direction of either the end wall, such as cervical cancers, or the upper wall, such as prostatic cancers and the mediastinal metastatic lymph nodes, if an improvement of the cooling system is achieved. [ABSTRACT FROM AUTHOR]
Copyright of International Journal of Hyperthermia is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 3818682
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  Label: Title
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  Data: The position of the opposite flat applicator changes the SAR and thermal distributions of the RF capacitive intracavitary hyperthermia.
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  Data: <searchLink fieldCode="AR" term="%22Hiraki%2C+Y%2E%22">Hiraki, Y.</searchLink><br /><searchLink fieldCode="AR" term="%22Nakajo%2C+M%2E%22">Nakajo, M.</searchLink><br /><searchLink fieldCode="AR" term="%22Takeshita%2C+T%2E%22">Takeshita, T.</searchLink><br /><searchLink fieldCode="AR" term="%22Churei%2C+H%2E%22">Churei, H.</searchLink>
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  Data: <searchLink fieldCode="JN" term="%22International+Journal+of+Hyperthermia%22">International Journal of Hyperthermia</searchLink>. May/Jun2000, Vol. 16 Issue 3, p193-203. 11p. 3 Black and White Photographs, 3 Diagrams, 1 Chart, 2 Graphs.
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  Data: <searchLink fieldCode="DE" term="%22Heat+radiation+%26+absorption%22">Heat radiation & absorption</searchLink><br /><searchLink fieldCode="DE" term="%22Cancer+thermotherapy%22">Cancer thermotherapy</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The variations of the specific absorption rate (SAR) and thermal distribution in the JSHO QA phantoms were investigated by radiofrequency (RF) capacitive intracavitary hyperthermia (ICHT) applicator (AP-T01, Omron Electric Co., Kyoto, Japan) with the changing position of the opposite flat applicator (15-cm in diameter). The thermal distribution was observed with the thermographic camera and the normalized SAR distribution was calculated with the thermal data that were measured with the thermocouple thermometers. The SAR and thermal distributions of AP-T01 significantly varied with the position of the opposite flat applicator. The slope of the normalized SAR became gradual towards the side of the flat applicator. During the operating of a high flow rate (1500ml/min) cooling system, the region between AP-T01 and the flat applicator was widely and rather homogeneously heated, except the hot spot around the end of AP-T01. This hot spot may be due to the imbalance of cooling of AP-T01 and the warming-up of the electrode. These results suggest that the RF capacitive ICHT using AP-T01 may be clinically effective on the deep-seated tumours in the direction of either the end wall, such as cervical cancers, or the upper wall, such as prostatic cancers and the mediastinal metastatic lymph nodes, if an improvement of the cooling system is achieved. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of International Journal of Hyperthermia is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1080/026567300285222
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      – Code: eng
        Text: English
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        PageCount: 11
        StartPage: 193
    Subjects:
      – SubjectFull: Heat radiation & absorption
        Type: general
      – SubjectFull: Cancer thermotherapy
        Type: general
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      – TitleFull: The position of the opposite flat applicator changes the SAR and thermal distributions of the RF capacitive intracavitary hyperthermia.
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            NameFull: Hiraki, Y.
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            NameFull: Nakajo, M.
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            NameFull: Takeshita, T.
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            – D: 01
              M: 05
              Text: May/Jun2000
              Type: published
              Y: 2000
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              Value: 02656736
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              Value: 16
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            – TitleFull: International Journal of Hyperthermia
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