in this paper, a novel decision based median (dbm) filter for enhancing mr images has been proposed. the method is based on eliminating impulse noise from mr images. a median-based method to remove impulse noise from digital mr images has been developed. each pixel is leveled from black to white like gray-level. the method is adjusted in order to decide whether the median operation can be appli...

Modern weapon systems produce very high levels of impulse and/or continuous noise. Exposure to intense noise induces mechanical and/or metabolic damage to the inner ear. At the hearing threshold the amplitude of the displacements of the sensory structures of the inner ear (stereocilia) is about 10 m (1/100 the diameter of the hydrogen atom). At 120 dB this amplitude reaches 1 micrometer (corres...

Sensory thresholds for vibrations and electrical shocks and the sensory nerve conduction velocity (median nerve) were measured during 30 minutes of induced limb ischaemia in 10 normal subjects and 15 patients with chronic hepatic failure. Sensory action potentials were recorded simultaneously at the wrist and elbow. Seven patients (group A) had a normal perception time for vibrations. As in nor...