Photoselective vaporization of the prostate (PVP) has been widely used to treat benign prostatic hyperplasia (BPH). It is
well regarded as a safe and minimally invasive procedure and an alternative to the gold standard transurethral resection
of the prostate (TURP). Despite of its greatness, as well aware of, the operative procedure time during the PVP is still
prolonged. Such attempts have been tried out in order to shorten the operative time and increase its efficacy. However,
scientific study to investigate techniques used during the PVP is still lacking. The objective of this study is to investigate
how sweeping angle might affect the PVP performance. Porcine kidneys acquired from a local grocery store were used
(N=140). A Q-switched 532-nm GreenLight XPSTM (American Medical Systems, Inc., MN, USA), together with 750-
μm core MoXyTM fiber, was set to have power levels of 120 W and 180 W. Treatment speed and sweeping speed were
fixed at 2 mm/s and 0.5 sweep/s, respectively. Sweeping angles were varied from 0 (no sweeping motion) to 120 degree.
Ablation rate, depth, and coagulation zone were measured and quantified. Tissue ablation rate was peaked at 15 and 30
degree for both 120- and 180-W power levels and dramatically decreased beyond 60 degree. At 180 W, ablation rate
increased 20% at 30 degree compared to 0 degree. This study demonstrated that ablation rate could be maximized and
was contingent upon sweeping angle.