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Genetic distances were calculated among 37 inbred lines representing a wide range of related and unrelated elite Corn Belt germ plasm of maize (Zea Mays L.), using 257 probe restriction enzyme combinations. Genetic distances based on RFLP data were highly correlated with coefficients of parentage among pairs of lines. The RFLP-based distance had a higher(More)
Modern positron emission tomography (PET) detectors are typically made from 2D modular arrays of scintillation crystals. Their characteristic flood field response (or flood histogram) must be segmented in order to correctly determine the crystal of annihilation photon interaction in the system. Crystal identification information thus generated is also(More)
Molecular imaging can potentially provide means for monitoring response to therapy in rheumatoid arthritis (RA) early in the course of disease [1].Quantitative measurements of RA disease activity made in the wrist by whole-body PET scanners, however, have inadequate accuracy because of limited spatial resolution [2]. A high-resolution PET/CT scanner for(More)
UNLABELLED We have constructed a dedicated breast PET/CT scanner capable of high-resolution functional and anatomic imaging. Here, we present an initial characterization of scanner performance during patient imaging. METHODS The system consisted of a lutetium oxyorthosilicate-based dual-planar head PET camera (crystal size, 3 x 3 x 20 mm) and 768-slice(More)
Kinetic parameters estimated from dynamic (18)F-fluorodeoxyglucose ((18)F-FDG) PET acquisitions have been used frequently to assess brain function in humans. Neglecting partial volume correction (PVC) for a dynamic series has been shown to produce significant bias in model estimates. Accurate PVC requires a space-variant model describing the reconstructed(More)
Improvements to current small animal PET scanners can be made by improving the sensitivity and the spatial resolution of the scanner. In the past, efforts have been made to minimize the crystal dimensions in the axial and transaxial directions to improve the spatial resolution and to increase the crystal length to improve the sensitivity of the scanner. We(More)
A combination of culture and polymerase chain reaction (PCR) amplification was employed to detectBorrelia burgdorferi in in vitro cultures of skin biopsy specimens. Spirochetes were observed by microscopic examination in 56 % (20/36) of the cultures from patients with erythema migrans who had not received prior antibiotic treatment. No growth ofBorrelia(More)
A dedicated breast PET/CT system has been constructed at our institution, with the goal of having increased spatial resolution and sensitivity compared to whole-body systems. The purpose of this work is to describe the design and the performance characteristics of the PET component of this device. Average spatial resolution of a line source in warm(More)
OBJECTIVE Determining the microbial cause of cellulitis is often difficult. In this study, a novel two-needle lavage technique was used to culture Borrelia burgdorferi from the skin of suspected erythema migrans lesions. DESIGN The yield of lavage cultures for B burgdorferi was compared with that of a 2-mm skin biopsy sample. SETTING A Lyme disease(More)
A cross-sectional group study of the effects of aging on brain metabolism as measured with (18)F-FDG-PET was performed using several different partial volume correction (PVC) methods: no correction (NoPVC), Meltzer (MZ), Müller-Gärtner (MG), and the symmetric geometric transfer matrix (SGTM) using 99 subjects aged 65-87years from the Harvard Aging Brain(More)