Authors: Anita Andreano Christopher L Brace
Publish Date: 2012/05/10
Volume: 36, Issue: 2, Pages: 505-511
Abstract
A total of 60 heating cycles 20 s at 90 W were performed in normal RFablated and microwaveablated liver tissues n = 10 RF and n = 10 microwave in each tissue type Heating cycles were performed using a 480kHz generator and 3cm cooledtip electrode RF or a 245GHz generator and 14gauge monopole microwave and were designed to isolate direct heating from each energy type Tissue temperatures were measured by using fiberoptic thermosensors 5 10 and 15 mm radially from the ablation applicator at the depth of maximal heating Power delivered sensor location heating rates and maximal temperatures were compared using mixed effects regression modelsNo significant differences were noted in mean power delivered or thermosensor locations between RF and microwave heating groups P 005 Microwaves produced significantly more rapid heating than RF at 5 10 and 15 mm in normal tissue 30 vs 073 085 vs 021 and 017 vs 009 °C/s P 005 and at 5 and 10 mm in ablated tissues 23 ± 14 vs 07 ± 03 05 ± 03 vs 02 ± 0 °C/s P 005 The radial depth of heating was ~5 mm greater for microwaves than RF
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