Bulletin of the American Physical Society
Joint Spring 2011 Meeting of the New England Sections of the APS and the AAPT
Volume 56, Number 2
Friday–Saturday, April 8–9, 2011; Lowell, Massachusetts
Session F1: Biomedical, Health, Nuclear Physics |
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Chair: Mark Tries, UMass Lowell Room: Olney Science Center 0-316 |
Saturday, April 9, 2011 8:00AM - 8:12AM |
F1.00001: Dye-Enhanced Multimodal Confocal Imaging of Brain Cancers Dennis Wirth, Matija Snuderl, Sameer Sheth, William Curry, Anna Yaroslavsky \textbf{Background and Significance}: Accurate high resolution intraoperative detection of brain tumors may result in improved patient survival and better quality of life. The goal of this study was to evaluate dye enhanced multimodal confocal imaging for discriminating normal and cancerous brain tissue. \textbf{Materials and Methods}: Fresh thick brain specimens were obtained from the surgeries. Normal and cancer tissues were investigated. Samples were stained in methylene blue and imaged. Reflectance and fluorescence signals were excited at 658nm. Fluorescence emission and polarization were registered from 670 nm to 710 nm.~The system provided lateral resolution of 0.6 $\mu $m and axial resolution of 7 $\mu $m. Normal and cancer specimens exhibited distinctively different characteristics. H{\&}E histopathology was processed from each imaged sample. \textbf{Results and Conclusions}: The analysis of normal and cancerous tissues indicated clear differences in appearance in both the reflectance and fluorescence responses. These results confirm the feasibility of multimodal confocal imaging for intraoperative detection of small cancer nests and cells. [Preview Abstract] |
Saturday, April 9, 2011 8:12AM - 8:24AM |
F1.00002: Maximal Transmission with Dielectric/Metal Coated Hollow Flexible Terahertz Waveguides Pallavi Doradla, C.S. Joseph, Jayant Kumar, Robert H. Giles Hollow, flexible, dielectric (Polystyrene), metal (Silver/Gold) coated polycarbonate waveguides have been designed and fabricated for maximal transmission of Terahertz radiation (THz). Attenuation characteristics of Terahertz radiation in metal coated waveguides with bore diameters 4.1mm, 3.2mm, 2 mm were studied at 215$\mu $m wavelength and the maximal transmission was obtained by coupling the lowest loss TE11 mode from an optically pumped terahertz laser. Transmission loss can be reduced substantially by creating corrugation in metal coated waveguides and by coupling HE11 mode into it. Minimal propagation loss of less than 1dB/m was achieved in metal coated waveguide with the addition of dielectric layer that causes corrugation. Polystyrene was chosen to be the dielectric, due to its lowest extinction coefficient, which enhances the transmission through the waveguide. The results will be presented during APS meeting. [Preview Abstract] |
Saturday, April 9, 2011 8:24AM - 8:36AM |
F1.00003: Physics for Medicine and Biology: Determining Body Fat Content Ronald Aaron, Albert Altman Hydrostatic weighing is a technique for determining body fat content that is based on Archimedes principle and varied applications of the ideal gas law. We use this procedure as an example of the types of physics material which should be presented in an introductory course for students that are interested in careers in biology and medicine. [Preview Abstract] |
Saturday, April 9, 2011 8:36AM - 8:48AM |
F1.00004: Dual x-ray absorptiometry Albert Altman, Ronald Aaron Dual x-ray absorptiometry is widely used in analyzing body composition and imaging. We discuss the physics of the method and exhibit its limitations and show it is related to the Compton and photoelectric contributions to the x-ray absorption coefficients of materials. [Preview Abstract] |
Saturday, April 9, 2011 8:48AM - 9:00AM |
F1.00005: Estimation of annual occupational effective doses from external ionizing radiation at medical institutions in Kenya Geoffrey Korir, Jeska Wambani, Ian Korir This study details the distribution and trends of doses due to occupational radiation exposure among radiation workers from participating medical institutions in Kenya, where monthly dose measurements were collected for a period of one year ranging from January to December in 2007. A total of 367 medical radiation workers were monitored using thermoluminescent dosemeters. They included radiologists (27{\%}), oncologists (2{\%}), dentists (4{\%}), Physicists (5{\%}), technologists (45{\%}), nurses (4{\%}), film processor technicians (3{\%}), auxiliary staff (4{\%}), and radiology office staff (5{\%}). The average annual effective dose of all categories of staff was found to range from 1.19 to 2.52 mSv. This study formed the initiation stage of wider, comprehensive and more frequent monitoring of occupational radiation exposures and long-term investigations into its accumulation patterns in our country. [Preview Abstract] |
Saturday, April 9, 2011 9:00AM - 9:12AM |
F1.00006: A Laser Testing Facility for the Characterization of Silicon Strip Detectors Sarah Phillips Silicon strip detectors are used for high-precision tracking systems in particle physics experiments. During the 12 GeV upgrade to the accelerator at Jefferson Lab, a new spectrometer, CLAS12, will be built in Hall B. The University of New Hampshire is part of the collaboration designing and building CLAS12. Among the detector systems being developed for CLAS12 is a silicon vertex tracker that will be placed close to the target, providing excellent position resolution for vertex determination. It is vital to have the ability to perform quality assurance tests and to evaluate the performance of the individual silicon strip detectors before installation in CLAS12. UNH is designing and building a laser testing facility to perform this task. The design consists of an infrared laser system and a precision computer-controlled positioning system that scans the laser light on the detector. The detector signals are read out by a data acquisition system for analysis. The facility includes a cleanroom area and a dry storage containment system. The facility allows the characterization of the large number of detectors before the final assembly of the silicon vertex tracker. [Preview Abstract] |
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