Related Experiment Video
Updated: Jul 14, 2026
06:43
Esophageal Heat Transfer for Patient Temperature Control and Targeted Temperature Management
Published on: November 21, 2017
Theoretical comparison of intraluminal heating techniques.
H P Kok1, P M A van Haaren, J B van de Kamer
1Department of Radiation Oncology, University of Amsterdam, The Netherlands. h.p.kok@amc.uva.nl
Summary
A hot water balloon effectively heats shallow tumors, while a 27-MHz device offers superior homogeneous heating for deeper tumors. Both intraluminal heating devices were simulated for temperature distribution, penetration, and homogeneity.
Area of Science:
- Medical Physics
- Biomedical Engineering
- Thermal Therapy
Background:
- Intraluminal heating devices are crucial for localized tumor treatment.
- Simulated temperature distributions are essential for device efficacy assessment.
- Comparing heating modalities like hot water balloons and radiofrequency applicators informs clinical application.
Purpose of the Study:
- To compare simulated temperature distributions of intraluminal heating devices.
- To evaluate thermal penetration and homogeneity of different heating modalities.
- To determine the suitability of devices for various tumor depths and infiltration levels.
Main Methods:
- Simulated temperature distributions for a hot water balloon, 434-MHz monopole, 915-MHz dipole antenna, and 27-MHz applicator.
- Investigated thermal penetration depth and temperature homogeneity under specified cooling conditions.
- Modeled axial steering for the 27-MHz applicator in inhomogeneous tissue.
Main Results:
- Hot water balloon achieved ~4 mm penetration; 27-MHz device achieved ~10 mm.
- 434-MHz and 915-MHz applicators showed penetration depths of ~10 mm (water cooling) and ~16 mm (air cooling).
- 27-MHz device allowed spatial steering for minimized temperature gradients; hot water balloon was less affected by tissue inhomogeneity.
Conclusions:
- Hot water balloon is suitable for tumors with limited infiltration.
- The 27-MHz device demonstrates potential for homogeneous heating in larger tumors.
- Device selection depends on tumor characteristics and desired thermal distribution.
Related Concept Videos
01:20Mechanisms of Heat Transfer II
In convection, thermal energy is carried by the large-scale flow of matter. Ocean currents and large-scale atmospheric circulation, which result from the buoyancy of warm air and water, transfer hot air from the tropics toward the poles and cold air from the poles toward the tropics. The Earth’s rotation interacts with those flows, causing the observed eastward flow of air in the temperate zones. Convection dominates heat transfer by air, and the amount of available space for the airflow...
01:14Mechanisms of Heat Transfer I
Just as interesting as the effects of heat transfer on a system are the methods by which the heat transfer occur. Whenever there is a temperature difference, heat transfer occurs. It may occur rapidly, such as through a cooking pan, or slowly, such as through the walls of a picnic ice box. So many processes involve heat transfer that it is hard to imagine a situation where no heat transfer occurs. Yet, every heat transfer takes place by only three methods: conduction, convection, and radiation.
01:14Mechanisms of Heat Transfer
Heat transfer between the human body and its environment occurs through four main mechanisms: conduction, convection, radiation, and evaporation.
Conduction, accounting for approximately 3% of body heat loss at rest, is the process of exchanging heat between molecules of two materials in direct contact. This can result in both heat loss and gain. For instance, when the body is submerged in water, which conducts heat 20 times more effectively than air, it can either lose or gain significant heat.
Conduction, accounting for approximately 3% of body heat loss at rest, is the process of exchanging heat between molecules of two materials in direct contact. This can result in both heat loss and gain. For instance, when the body is submerged in water, which conducts heat 20 times more effectively than air, it can either lose or gain significant heat.