Learn More
This article reviews the published efforts to characterize hepatic motion secondary to respiration, with the specific goal of defining the limitations and potential applications of image-guided systems in percutaneous liver interventions (computer assisted interventions). Hepatic motion and deformation due to respiration remain obstacles to applying(More)
PURPOSE To retrospectively determine the sensitivity of ovarian artery (OA) visualization at aortography performed after uterine fibroid embolization (UFE) and, using OA arteriography as the reference standard, compare the extent of arterial flow to the uterus at aortography with selective ovarian arteriography, to establish the utility of aortography and(More)
Radiofrequency ablation of primary and metastatic liver tumors is becoming a potential alternative to surgical resection. We propose a novel system that uses real-time electromagnetic position sensing of the needle tip to help with precision guidance into a liver tumor. The purpose of this study was to evaluate this technology in phantom and animal models.(More)
PURPOSE To assess the feasibility of the use of preprocedural imaging for guide wire, catheter, and needle navigation with electromagnetic tracking in phantom and animal models. MATERIALS AND METHODS An image-guided intervention software system was developed based on open-source software components. Catheters, needles, and guide wires were constructed(More)
OBJECTIVE The objective of our study was to evaluate the frequency and extent of residual uterine perfusion via the ovarian arteries after bilateral uterine artery embolization (UAE) for the treatment of symptomatic uterine leiomyomas. MATERIALS AND METHODS One hundred forty-five consecutive patients who underwent UAE were retrospectively evaluated for(More)
We present three image-guided navigation systems developed for needle-based interventional radiology procedures, using the open source image-guided surgery toolkit (IGSTK). The clinical procedures we address are vertebroplasty, RF ablation of large lung tumors, and lung biopsy. In vertebroplasty, our system replaces the use of fluoroscopy, reducing(More)
Immune cells that infiltrate a tumor may be a prognostic factor for patients who have had surgically resected hepatocellular carcinoma (HCC). The density of intratumoral total (CD3(+)) and cytotoxic (CD8(+)) T lymphocytes was measured in the tumor interior and in the invasive margin of 65 stage I to IV HCC tissue specimens from a single cohort. Immune cell(More)
From the Division of Interventional Radiology (F.B.) and the Departments of Radiology (D.C.B.) and Surgery (D.M.L.), Georgetown University Hospital, 3800 Reservoir Rd, NW, Washington, DC 20007; the Division of Vascular and Interventional Radiology, Stanford University Medical Center, Stanford, California (W.T.K.); the Department of Radiology, Division of(More)
PURPOSE To determine the imaging outcome after uterine artery embolization (UAE) with use of tris-acryl gelatin microspheres (Embospheres). MATERIALS AND METHODS A retrospective analysis of magnetic resonance (MR) images was performed comparing studies completed 3-4 months after UAE to those performed before UAE. Twenty-three patients with 61 leiomyomata(More)
Electromagnetic tracking has great potential for assisting physicians in precision placement of instruments during minimally invasive interventions in the abdomen, since electromagnetic tracking is not limited by the line-of-sight restrictions of optical tracking. A new generation of electromagnetic tracking has recently become available, with sensors small(More)