93 research outputs found

    Visible point vector summations from hypercube and hyperpyramid lattices

    No full text
    New identities are given, based on ideas related to visible (from the origin) point vectors. Each result was found from summing on vpv lattices dividing space into radial regions from the origin. This is related to recent work by the author in which new partition type infinite products were derived. Also recently, Baake et al [3] and Mosseri [14] considered the 2-D visible lattice points as part of an optical experiment in which the so-called Optical Fourier Transform was applied. Many of the techniques espoused in Glasser and Zucker [11], and in Ninham et al [15] involving Mellin and Möbius inversions are applicable also to the current paper

    Effective Dose Reduction in Lateral Lumbar Spine Diagnostic Radiography Using X-Ray Tube Heel Effect

    No full text
    The study aimed to determine how the effective dose (ED) in lumbar spine X-ray examinations is influenced by patient positioning considering the X-ray tube heel effect. The study used Monte Carlo simulation of the effective dose. Using the heel effect, positioning of the patient in the head to anode direction reduces the effective dose by 5% when compared with the head to cathode positioning.</jats:p
    corecore