C Ede | PubMed Health

PubMed2005

Fast DRR generation for 2D/3D registration.

We present a simple and rapid method for generation of perspective digitally rendered radiographs (DRR) for 2D/3D registration based on splat rendering. Suppression of discretization artefacts by means of computation of Gaussian footprints--which is a considerable computational burden in classical splat rendering--is replaced by stochastic motion of either the voxels in the volume to be rendered, or by simulation of a X-ray tube focal spot of finite size. The result is a simple and fast perspective rendering algorithm using only a small subset of voxels. Our method generates slightly blurred DRRs suitable for registration purposes at framerates of approximately 10 Hz when rendering volume images with a size of 30 MB on a standard PC.

Algorithms↗

PubMed2003

Cerebral metastases of a choriocarcinoma during pregnancy.

BACKGROUND: Cerebral metastasis of choriocarcinoma during pregnancy is rare. Described is the fourth case in the literature. CASE: A pregnant women at 28 weeks' gestation sought care for headaches followed by loss of consciousness. The diagnosis of choriocarcinoma metastases was made on the basis of the combination of cerebral and pulmonary lesions, all suspected to be metastatic, and a high beta human chorionic gonadotropin level. A premature cesarean delivery was performed to improve the mother's prognosis; the responsiveness of choriocarcinoma to chemotherapy made it important for treatment to begin as rapidly as possible. The outcome has been on balance favorable, even though her sequelae include paraplegia. The child has no apparent sequelae. CONCLUSION: The diagnosis of choriocarcinoma must be considered when acute neurological signs appear in a pregnant patient.

Adult↗