Glossary

Category: P

  • Plurigraph

    The Picker tomographic system is specifically engineered to enable pluridirectional and rectilinear tomography. In addition, it possesses the versatility to function as both a flat bucky for routine studies in a horizontal position, as well as an erect configuration for upright imaging procedures.  

  • Plumbicon tube

    A specific type of television pick-up tube renowned for its exceptional sensitivity to light stimulation and renowned for its high resolution capabilities.  

  • Plesiosette

    A multiple screen cassette apparatus for separating films one millimeter apart to provide multiple tomography films with one exposure.  

  • Pinhole camera

    It is specifically designed to gauge the dimensions of the focal spot in x-ray tubes.  

  • Pi mesons

    Pions, commonly referred to as such, occupy an intermediate scale between that of an electron and a proton in terms of size. A pion carries a mass that is 273 times greater than that of an electron, while being one-sixth the mass of a proton.  

  • Pi lines

    The phenomenon of plus density lines typically manifests approximately 3.14 inches away from the leading edge of the radiograph. These lines occur due to the accumulation of residual gelatin and byproducts of the developer, forming a continuous line along a roller positioned within the developer transport rack of an automatic processor.  

  • Piezoelectric crystals

    It is essential for the substance to possess an ionic charge capable of interacting with an externally applied electric field, thereby generating a mechanical effect. Examples of such substances include barium titanate and lead zirconate.  

  • pick-up tube

    It pertains to the responsive component found within a television camera, which facilitates the conversion of a light image into an electrical signal.  

  • Physiological effect

    It refers to the impact that drugs or agents can potentially exert on living cells or tissues.  

  • Phototimer

    A timer is incorporated into the x-ray machine to facilitate automatic shutdown once the film has received the appropriate exposure. This determination is made by an integrating photoelectric measuring system, which actively monitors a fluorescent screen positioned behind the film.