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PURPOSE A novel electromagnetic tracking configuration was characterized and implemented for image-guided surgery incorporating C-arm fluoroscopy and/or cone-beam CT (CBCT). The tracker employed a field generator (FG) with an open rectangular aperture and a frame enclosure with two essentially hollow sides, yielding a design that presents little or no X-ray(More)
We present a case of desmoplastic cerebral astrocytoma of infancy (DCAI) in a 7 1/2-month-old girl and include immunohistochemical, ultrastructural and proliferative activity studies. The dural-based cystic tumor showed a biphasic pattern consisting of glial fibrillary acidic protein (GFAP)-positive astrocytes embedded in a desmoplastic stroma. The(More)
Fig. 1. Pseudo gray platelets. (A) Blood collected in EDTA 4 hours prior showing aggregated agranular gray platelets (arrow). (B) Blood collected into EDTA showing large and pale agranular platelets. (C) Blood collected into sodium citrate showing normally stained platelets with tiny purple granules. Blood films were prepared immediately after venipuncture(More)
A small-scale laboratory adaptive optics system using a Shack-Hartmann wave-front sensor (WFS) and a membrane deformable mirror (DM) has been built for robust image acquisition. In this study, an adaptive limited control technique is devised to maintain the long-term correction stability of the adaptive optics system. To prevent the waste of dynamic(More)
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