Peter Yin Kai Hwang

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OBJECTIVE We have developed a highly interactive virtual environment that enables collaborative examination of stereoscopic three-dimensional (3-D) medical imaging data for planning, discussing, or teaching neurosurgical approaches and strategies. MATERIALS AND METHODS The system consists of an interactive console with which the user manipulates 3-D data(More)
OBJECTIVE We have developed an interactive virtual model of the temporal bone for the training and teaching of cranial base surgery. METHODS The virtual model was based on the tomographic data of the Visible Human Project. The male Visible Human's computed tomographic data were volumetrically reconstructed as virtual bone tissue, and the individual(More)
OBJECTIVE We developed an augmented reality system that enables intraoperative image guidance by using 3-dimensional (3D) graphics overlaid on a video stream. We call this system DEX-Ray and report on its development and the initial intraoperative experience in 12 cases. METHODS DEX-Ray consists of a tracked handheld probe that integrates a lipstick-size(More)
Postoperative haemorrhage (POH) is one of the most serious complications of any cranial neurosurgical procedure and is associated with significant morbidity and mortality. The relative paucity of work investigating this postoperative complication prompted us to undertake a review of the literature, focussing on demographic, clinical, and surgical risk(More)
Gene delivery to sensory neurons of the dorsal root ganglion (DRG) offers the prospect of developing new clinical interventions against peripheral nerve diseases and disorders. Here we show that genes can be transferred to rat DRG through lumbar intrathecal injection of delivery vectors into the cerebrospinal fluid. Genes could be transferred to DRG using(More)
SUMMARY We applied regional perfusion imaging (RPI), a new arterial spin-labeling MR imaging method that selectively studies regions of the brain perfused by individual carotid and basilar arteries. In a patient with cerebrovascular disease, RPI showed cerebral tissue perfused by pial collateral vessels, thereby demonstrating the relationship between(More)
OBJECTIVE Surgical approaches described for resection of clival tumors have been complicated, extensive, traumatic, and invasive. They are also associated with significant mortality and morbidity rates. We describe a minimally invasive, endoscopic transsphenoidal surgical treatment for clival tumors. METHODS Three men, aged 43, 46, and 66 years, each(More)
Palmar hyperhidrosis has been treated using a variety of medical and surgical techniques with varying degrees of success. The authors report their experience in 82 patients in whom they performed 164 sympathectomies using a video endoscope, a laparoscopic grasper, and microscissors. Patients were monitored by palm temperature electrodes. An intraoperative(More)
OBJECTIVES Carpal tunnel syndrome is a common condition causing hand pain, dysfunction, and paresthesia. Endoscopic carpal tunnel decompression offers many advantages compared with conventional open surgical decompression. However, it is equipment intensive and requires familiarity with endoscopic surgery. We review a minimally invasive technique to divide(More)
BACKGROUND To evaluate the feasibility of surgical planning using a virtual reality platform workstation in the treatment of cerebral arterio-venous malformations (AVMs) METHODS Patient-specific data of multiple imaging modalities were co-registered, fused and displayed as a 3D stereoscopic object on the Dextroscope, a virtual reality surgical planning(More)