Geoffrey S. Ibbott, Ph.D. 1993, Colorado State University The University of Texas M. D. Anderson Cancer Center Department of Radiation Physics Contact Information

Research Interests:

• Radiation dosage
• Gel dosimetry
• Brachytherapy
• Health care quality assurance
• Multicenter studies

An area of active research for a number of years has been the development and evaluation of a polymerizing gel dosimeter. The practice of radiation oncology has evolved as a result of the availability of equipment and techniques that facilitate the production of complex dose distributions. However, the physical dosimetry has lagged behind. A polymerizing gel dosimetry system has been developed (MGS Research, Inc., Guilford CT) and is based on radiation-induced chain polymerization of acrylic monomers dispersed in a tissue-equivalent gel. During recent years, the dosimeter has been refined and improved by my collaborators and myself, and its value has been demonstrated in a number of areas including verification of placement of stereotactic beams, quantitative dosimetry, and demonstration of dose distributions around brachytherapy sources.

Most prior work has depended on MR imaging of the gel to measure dose distributions, but recently, optical imaging has been investigated. The student would participate in determination of the optical characteristics of the gel to optimize imaging, and determination of dosimetric characteristics such as dose linearity, dose rate dependence and energy dependence. Means of implementing the gel for remote monitoring of dose distributions would be investigated.

Publications

Program Affiliation:

Program in Medical Physics