This study was carried out to obtain optimum operation conditions for X-ray machines. We investigated some factors affecting on quality assurance of conventional Siemen X-ray machine, inone of Mansoura Hospitals such as reproducibility of dose output, time and applied high voltage, Kilo-voltage accuracy, mA accuracy, time accuracy, and linearity. We measured these factors using Non-Invasive kil...

We explore the properties of the fragmentation of magnetic flux in solar active regions. We apply gradient-based tessellation to magnetograms of 59 active regions to identify flux fragments. First, we find that the distribution function of flux fragments in these regions is highly consistent with lognormal form, which is the most direct evidence yet obtained that repeated random bifurcation dom...

Articles you may be interested in Plasmonic light trapping in an ultrathin photovoltaic layer with film-coupled metamaterial structures Enhancement of current collection in epitaxial lift-off InAs/GaAs quantum dot thin film solar cell and concentrated photovoltaic study Appl. The effects of temperature on the key parameters of a prototype GaAs 55 Fe radioisotope X-ray microbattery were studied ...

We present a uniform approach to problems involving lines in 3-space. This approach is based on mapping lines in R 3 into points and hyperplanes in 5-dimensional projective space (Pl ucker space). We obtain new results on the following problems: 1. Preprocess n triangles so as to eeciently answer the query: \Given a ray, which is the rst triangle hit?" (Ray-shooting problem). We discuss the ray...

background: making use of the orthovoltage machines in radiotherapy, is one of the routine methods for the treatment of the superficial lesions. in this study, an important determinant of x-ray quality, the hvl (half value layer), has been evaluated. materials and methods: the hvls of a orthovoltage x-ray machine in 120 and 180 kvp are measured, using an empirical method, in which the hvls are ...

background x-ray, is one of the oldest, and yet the most widely used form of medical photographing. x-ray is a valuable tool to diagnose and examine many diseases such as arthritis, spinal injuries, pneumonia, bronchitis and even cancer. running a quality control program of the radiology devices can reduce the absorbed dose in the patients. the aim of this study is to take the quality control t...

Data mapping is a procedure for transforming seismic or acoustic data collected with one set of source/receiver locations and wavespeed model, to data equivalent to that collected in a diierent source/receiver connguration and wavespeed model. A major application of this general process is downward continuation of the waveeeld, or wave-equation datuming. Unlike many previous implementations of ...