Browsing by Author "Beineen,A. A"

Now showing 1 - 2 of 2

Assessment of Diagnostic X-ray Machine Resolution Using Modulation Transfer Function
(International Journal Dental and Medical Sciences Research (IJDMSR), 2020) Deiab,Huyam F; AbdAllh,Nedal A; Beineen,A. A; Gar-Elnabi,M. E. M
This study design to measure the x-ray machine resolution using MTF which gives a full description of the machine resolution. The x-ray machines were investigated the optimum resolution using wire phantom designed by the researcher which consisted of variable thicknesses used to test variable exposure factors. The prototype phantom consisted of five wires with different thickness assessed the diagnostic x-ray machine resolution by found the optimum kV relative to machine type. This study showed that the best machine resolution was Shimadzu 2011 for Khartoum emergency hospital that had high resolution 97% at 46Kv for thickness of 1.4mm compared with Toshiba 2011 for Almotkamil hospital that had 92% at 46Kvp. Also, the result showed that for the two types of x-ray machines the x-ray tubes don’t produced the same exposure and the output decreased with age of x-ray unit, also the resolution reduced when decreased the thickness of the wires. And from all measurement we notice when the spatial resolution become smaller the resolution becomes better and with increase the x ray machines tube voltage the resolution become best. For spatial resolution 0.36 the resolution is better than the other frequencies and when compares the kilo voltage 40, 44 and 46 kV the voltage 46 kV give best resolution than 40 and 44 kV.
Assessment of Image Quality for Digital Radiography Units using Prototype Phantom
(International Journal Dental and Medical Sciences Research (IJDMSR), 2020) Deiab,Huyam F; AbdAllh,Nedal A; Beineen,A. A; Gar-Elnabi,M. E. M
The main objective of this study to measure the x-ray machines resolution using Modulation Transfer Function MTF which gives a full description of the machine resolution. this study introduced the a more reliable method of measuring the resolution which is modulation transfer function (MTF) which gives a complete description of the resolution instead of using full width at half maximum (FWHM) or the visibility method which is more qualitative where MTF is a real quantitative method, by designed a prototype phantom consisted of five wires with different thickness and kV for five x-ray units. with three object spatial frequency 0.333, 0.298 and 0.216 cycle/mm, imaging the designed phantoms the thickness from wire showed the best results of 0.333 cycle/mm from all hospitals was 92% for 44 kV at ALS hospital, and for 0.298 cycle/mm the best resolution from all hospitals was 97% for 40 kV at Sudan University hospital, the frequency 0.216 cycle/mm the best resolution was 100% at RO with kV 40, ALS at 44 kV and SHN and ALS at 46 kV. Also, the results showed that as the object spatial frequency increased (thickness of the wire decreased) the resolution values decreased as the results of the Kv increases. This is mainly due to the penetration of the radiation as well as the limitation of the x-ray resolution in picking up finer details where the intensifying screen and the film capabilities limit the infant of the resolution.