Cylindrical Phased-array Ultrasound Transducer with Multifocal Patterns for Breast Tumor Thermal Therapy
Date Issued
2009
Date
2009
Author(s)
Lin, Chiang-Tien
Abstract
This study investigated the feasibility of using a 0.5 MHz cylindrical phased-array ultrasound transducer with multifocus patterns scanning to produce uniform heating for breast tumor thermal therapy. The breast was submerged in water and surrounded by the cylindrical phased-array ultrasound transducer. Multifocus patterns are electrically scanned by the phased-array to enlarge the treatment lesion in a single heating. To prevent overheating normal tissues, a large planning target volume (PTV) would be divided into several subunits and sequentially treated with a cooling phase between two successive heatings of the subunit. Heating results for different blood perfusion rates and locations of the PTV have been studied. Furthermore, a superficial breast tumor with different water temperatures was also studied. Simulation results show that perfusion rate reduces the treatment time significantly and the location of PTV affects the thermal lesion shape slightly. Due to large acoustic window and the effect of surrounding cooling water, this system was able to achieve a uniform heating without overheating the skin within a short treatment time. This study demonstrated that the proposed cylindrical phased-array ultrasound transducer can provide effective heating for breast tumor thermal therapy without overheating the skin and ribs within a reasonable treatment time.
Subjects
cylindrical phased-array ultrasound transducer
multifocus patterns
breast tumor
planning target volume
Type
thesis
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