Woodruff School of Mechanical Engineering
Nuclear & Radiological Engineering and Medical Physics Programs
Computational Tools for Dose Assessment to Children in Diagnostic Imaging and Radiotherapy
Dr. WESLEY BOLCH
UNIVERSITY OF FLORIDA
Tuesday, September 6, 2016 at 11:00:00 AM
Boggs Building, Room 3-47
Computational phantoms of children and adolescents are an essential component for documenting patient dose in both medical imaging and radiotherapy. For most nuclear medicine and interventional fluoroscopy procedures, no 3D image of the body is present for dosimetric analysis, and thus organ doses must be derived using these virtual anatomic models. In computed tomography and radiotherapy treatment planning, 3D images are present, but organ contouring can be problematic. Furthermore, phantoms are needed for documenting doses to organs that lie either partially or fully outside the imaging or treatment field. Computational phantoms presently come in one of three format types, and in one of four morphometric categories. Format types include stylized (mathematical equation-based), voxel (segmented CT/MR images), and hybrid (NURBS and polygon mesh surfaces). Morphometric cate! gories include reference (small library of phantoms by age at 50th height/weight percentile), patient-dependent (larger library of phantoms at various combinations of height/weight percentiles), patient-sculpted (phantoms altered to match the patient's unique outer body contour), and finally, patient-specific (an exact representation of the patient with respect to both body contour and internal anatomy). In this presentation, we will review the history of pediatric anatomic models for dose assessment, and explore the degree to which newer phantom technology can reduce errors in organ dose substantially through explicitly considering patient body morphometry. Models for specific organs will be reviewed as well, with particular emphasis on the pediatric skeleton and bone marrow.
Wesley E. Bolch is Professor of Biomedical Engineering and Medical Physics in the J. Crayton Pruitt Family Department of Biomedical Engineering at the University of Florida (UF). He serves as Director of ALRADS. The Advanced Laboratory for Radiation Dosimetry Studies at UF. He has been certified by the American Board of Health Physics since 1994 and licensed in Radiological Health Engineering by the Texas Board of Professional Engineers since 1992. In 2011, Dr. Bolch was elected Fellow of both the Health Physics Society (HPS) and the American Association of Physicists in Medicine (AAPM). He has been a member of the Society of Nuclear Medicineâ?Ts Medical Internal Radiation Dose (MIRD) Committee since 1993, a member of the National Council on Radiation Protection and Measurements (NCRP) since 2005, and a member of Committee 2 of the International Commission on Radiolog! ical Protection (ICRP) since 2005. Within the latter, he serves as C2 Secretary and Leader of the ICRP Task Group on Computational Phantoms and Radiation Transport (CPRT). He has published over 190 peer-reviewed journal articles, co-authored/edited 14 books/book chapters, and served as author on two NCRP Reports, two ICRP Publications, and two MIRD Monographs. He is the recipient of the 2014 Distinguish Scientific Achievement Award by the Health Physics Society acknowledging outstanding contributions to the science and technology of radiation safety.