Perturbations due to the use of catheters with non-perturbing thermometry probes.
Perturbations due to the use of catheters with non-perturbing thermometry probes were investigated in static phantom at 915 MHz. Fibre optic probes for the Luxtron and Clini-Therm thermometry systems, and Vitek probes for the BSD hyperthermia systems, were inserted in closed-end catheters at depths up to 2 cm in the phantom and exposed parallel to the E-field. The probes alone produced 0-12 per cent changes in heating and catheters alone were 0-20 per cent. When the probes were inserted in catheters, perturbations were 0-12 per cent at the surface and 1 cm depth, and 5-15 per cent at 2 cm depth. Even with non-perturbing probes it is important to place catheters perpendicular to the E-field during microwave hyperthermia.
Chan
K W
KW
Department of Radiation Research, City of Hope, National Medical Center, Duarte, California 91010-0269.
Chou
C K
CK
McDougall
J A
JA
Luk
K H
KH
D004574:Electromagnetic Fields; D006979:Hyperthermia, Induced / Q000295:instrumentation*; D013821:Thermometers