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Biomechanical properties of soft tissues are important for a wide range of medical applications, such as surgical simulation and planning and detection of lesions by elasticity imaging modalities. Currently, the data in the literature is limited and conflicting. Furthermore, to assess the biomechanical properties of living tissue in vivo, reliable(More)
In this paper we evaluate tissue elasticity as a longstanding but qualitative biomarker for prostate cancer and sonoelastography as an emerging imaging tool for providing qualitative and quantitative measurements of prostate tissue stiffness. A Kelvin-Voigt Fractional Derivative (KVFD) viscoelastic model was used to characterize mechanical stress relaxation(More)
OBJECTIVE To compare our experience of pure laparoscopic radical prostatectomy (LRP) with robot-assisted radical prostatectomy (RAP). PATIENTS AND METHODS The two techniques were compared retrospectively in 100 patients with localized prostate cancer who had LRP or RAP (50 each). Both groups were similar in age, serum prostate-specific antigen level,(More)
Crawling wave (CrW) sonoelastography is an elasticity imaging technique capable of estimating the localized shear wave speed in tissue and, therefore, can provide a quantitative estimation of the Young's modulus for a given vibration frequency. In this paper, this technique is used to detect cancer in excised human prostates and to provide quantitative(More)
OBJECTIVE To describe our surgical technique and outcomes with robot-assisted laparoscopic repair of vesicovaginal fistula (VVF) in 10 patients. METHODS From November 2010 to April 2014, a total of 10 patients with VVF underwent robot-assisted laparoscopic VVF repair. The principles of VVF repair were followed. The fistula tract was excised. The vagina(More)
PURPOSE With the exponential growth of robotic urological surgery, particularly with robot assisted radical prostatectomy, guidelines for safe initiation of this technology are a necessity. Currently no standardized credentialing system exists to our knowledge to evaluate surgeon competency and safety with robotic urological surgery performance. Although(More)
Quantification of mechanical properties of human prostate tissue is important for developing sonoelastography for prostate cancer detection. In this study, we characterized the frequency-dependent complex Young's modulus of normal and cancerous prostate tissues in vitro by using stress relaxation testing and viscoelastic tissue modeling methods. After(More)
OBJECTIVES Pure laparoscopic urologic surgery is becoming the standard of care for many urologic procedures. Training surgeons without any experience in the field is still a challenge. It is well recognized that two-dimensional optics causes difficulty for the novice. Thus, we assessed a new-generation, three-dimensional (3D) visualization system. METHODS(More)
The advantages of minimally invasive surgery are well accepted. Shorter hospital stays, decreased postoperative pain, rapid return to preoperative activity, decreased postoperative ileus, and preserved immune function are among the benefits of the laparoscopic approach. However, the instruments of laparoscopy afford surgeons limited precision and poor(More)
BACKGROUND AND PURPOSE A large prostate can complicate an extraperitoneal robot-assisted radical prostatectomy (RARP). We report our experience with RARP and evaluate the effects of prostate size on treatment outcomes after extraperitoneal RARP. PATIENTS AND METHODS Information on 355 consecutive patients undergoing extraperitoneal RARP was gathered, and(More)