Assessment for the Temperature according to the Electrode Diameter of Radio Frequency Hyperthermia Using Agar Phantom

Yong Hee Lee; Young Kee Oh; Hwa Yeong Kim; Kyung Soo Jeon; Eun Cheol Choi; Seung Gyu Park; Ok Bae Kim; Jin Hee Kim

doi:10.14316/pmp.2014.25.1.1

Journal List > Prog Med Phys > v.25(1) > 1098427

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Lee, Oh, Kim, Jeon, Choi, Park, Kim, and Kim: Assessment for the Temperature according to the Electrode Diameter of Radio Frequency Hyperthermia Using Agar Phantom

Original Article

Progress in Medical Physics 2014;25(1):1-7.

Published online: 17 March 2014

DOI: https://doi.org/10.14316/pmp.2014.25.1.1

Assessment for the Temperature according to the Electrode Diameter of Radio Frequency Hyperthermia Using Agar Phantom

Yong Hee Lee^∗,^†, Young Kee Oh^∗,, Hwa Yeong Kim^∗, Kyung Soo Jeon^∗, Eun Cheol Choi^∗, Seung Gyu Park^∗, Ok Bae Kim^∗, Jin Hee Kim^∗

^∗Department of Radiation Oncology, Dongsan Medical Center, Keimyung University School of Medicine, Daegu, Korea

^†Department of Physics, College of Science, Yeungnam University, Gyeongsan, Korea

Correspondence:Young Kee Oh(ykoh@dsmc.or.kr) Tel: 82-53-250-7683, Fax:82-53-250-7984

Received 6 December 2013 Accepted 10 March 2013

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Hyperthermia is effective treatment modality when it combine with the radiotherapy treatment. It is important to verify the temperature distribution of (patient's) body for the safety and effective treatment during raising the temperature. In this study, we raised the temperature in agar phantom using radio frequency (RF) Hyperthermia and protocol that manufacture recommend. Temperature distribution measured 5 section of 5 cm thickness with agar phantom. When the temperature was raised according to the increase energy. Temperature distribution was elevated at similar domain regardless of energy. The temperature tend to be increased at up side then bottom side and also increase when A large electrode was used than small one.

Keywords: Hyperthermia, Agar phantom, Temperature distribution

REFERENCES

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Fig. 1.

Agar phantom and temperature sensor. Size 32×6×3 cm³.

Fig. 2.

Thermal distribution of 25∼25 cm electrode (liver protocol session 5), (a) surface, (b) depth 3 cm, (c) depth 6 cm, (d) depth 9 cm, (e) depth 12 cm.

Fig. 3.

Temperature Profiles (liver protocol session 5), (a) electrode 25∼25 cm, (b) electrode 15∼15 cm.

Fig. 4.

Thermal distribution of 15∼15 cm electrode (liver protocol session 5), (a) surface, (b) depth 3 cm, (c) depth 6 cm, (d) depth 9 cm, (e) depth 12 cm.

Fig. 5.

Thermal distribution of 15∼25 cm electrode (liver protocol session 5), (a) surface, (b) depth 3 cm, (c) depth 6 cm, (d) depth 9 cm, (e) depth 12 cm.

Fig. 6.

Thermal distribution of 25-15 cm electrode (liver protocol session5), (a) surface, (b) depth 3 cm, (c) depth 6 cm, (d) depth 9 cm, (e) depth 12 cm.

Table 1.

Measurement conditions of thermal distribution.

	Diameter of electrodes (cm)	Duration (min)	Power (watt)
	Upper-lower
Liver protocol session 1	25-25	10	35
		10	55
		10	75
		10	85
		10	95
Liver protocol session 5	25-25	10	60
		10	85
		10	110
		10	135
		10	140

Table 2.

Measurement conditions of thermal distribution.

	Diameter of electrodes (cm)	Duration (min)	Power (watt)
Head & Neck protocol session 5	Upper-lower	10	60
		10	80
	25-15	10	95
	15-15	10	110
	15-25	10	120

Table 3.

Thermal distribution at center of 25∼25 cm electrode, duration 10 min (a) Liver protocol session1 (total energy 206 kJ), (b) Liver protocol session5 (total energy 315 kJ).

(a)
Depth	Power(W)						Difference
Depth	Start	35	55	75	85	95	Difference
3 cm	26.2	27.3	28.6	30.3	32.0	33.8	7.6
6 cm	25.7	26.5	27.3	28.7	30.2	31.9	6.2
9 cm	24.7	25.4	26.3	27.9	29.2	31.0	6.3
12 cm	25.4	26.0	26.5	27.6	28.8	29.9	4.5
(b)
Depth	Power(W)						Difference
Depth	Start	65	85	110	135	140	Difference
3 cm	26.7	29.0	31.0	33.9	36.6	39.7	13.0
6 cm	27.0	28.2	30.0	32.6	35.3	38.2	11.2
9 cm	27.2	28.7	30.0	31.9	34.2	36.9	9.7
12 cm	28.1	28.9	30.0	31.2	32.9	34.6	6.5

Table 4.

Temperature profiles of 25∼25 cm electrode.

Depth	Distance from the electrode center
Depth	Center	5 cm	10 cm
3 cm	13.0	11.0	6.7
6 cm	11.2	8.9	4.6
9 cm	9.7	7.6	4.1
12 cm	6.5	6.0	4.0

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