The PK Superpulse system provides faster removal of tissue in a bloodless field with better views and a safer environment of saline irrigation with efficacy comparable to that of conventional TURP. However, further randomized trials with extended follow-up may be needed to better define the role of the PK Superpulse system in treating patients with symptomatic BPH.

A 65-year-old man with a 5.5 x 3.2-cm stage T(2)N(0)M(0) grade III renal-cell carcinoma suffered a port-site metastasis 8 months after laparoscopic radical nephrectomy with specimen removal in an organ-retrieval bag. This case underlines the need to be conversant with, and care to avoid, risk factors for this complication.

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This paper primarily exploits some of the more obscure, but inherent properties of camera and image to propose a simpler and more efficient way of perceiving depth. The proposed method involves the use of a single stationary camera at an unknown perspective and an unknown height to determine depth of an object on unknown terrain. In achieving so a direct correlation between a pixel in an image and the corresponding location in real space has to be formulated. First, a calibration step is undertaken whereby the equation of the plane visible in the field of view is calculated along with the relative distance between camera and plane by using a set of derived spatial geometrical relations coupled with a few intrinsic properties of the system. The depth of an unknown object is then perceived by first extracting the object under observation using a series of image processing steps followed by exploiting the aforementioned mapping of pixel and real space coordinate. The performance of the algorithm is greatly enhanced by the introduction of reinforced learning making the system independent of hardware and environment. Furthermore the depth calculation function is modified with a supervised learning algorithm giving consistent improvement in results. Thus, the system uses the experience in past and optimizes the current run successively. Using the above procedure a series of experiments and trials are carried out to prove the concept and its efficacy.