Aneurysmal Bone Cyst of Capitate.

Primary aneurysmal bone cyst of the capitate is a rare disorder and it occurs commonly in the metacarpal bones. There are only three documented cases in literature of its occurrence in carpal bones. We report one such case of a 21-year-old male serving soldier, its clinical presentation, imaging findings, and treatment by curettage and bone grafting.

Challenges to validation of a complex nonsterile medical device tray.

Validation by steam sterilization of reusable medical devices requires careful attention to many parameters that directly influence whether or not complete sterilization occurs. Complex implant/instrument tray systems have a variety of configurations and components. Geobacillus stearothermophilus biological indicators (BIs) are used in overkill cycles to to simulate worst case conditions and are intended to provide substantial sterilization assurance.

Design and evaluation of a variable aperture collimator for conformal radiotherapy of small animals using a microCT scanner.

Treatment of small animals with radiation has in general been limited to planar fields shaped with lead blocks, complicating spatial localization of dose and treatment of deep-seated targets. In order to advance laboratory radiotherapy toward what is accomplished in the clinic, we have constructed a variable aperture collimator for use in shaping the beam of microCT scanner. This unit can image small animal subjects at high resolution, and is capable of delivering therapeutic doses in reasonable exposure times.