Assessment of Diagnostic X-ray Machine Resolution Using Modulation Transfer Function

Abstract

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.