Effect of X-ray Tube Focal Spot Size on Image Quality

Abstract

This study was aimed to evaluate the effect of focal spot size on image quality, this study was done in Modern Medical Center, and The X-ray machine modality is digital radiography. Before collection of data x.ray machines calibrated, This study proved that fine focal spot images were sharp in outline compared to broad focal spot images, the image quality was evaluated by visual perception by questionnaire 100 professional Radiologist were asked to evaluate the image quality for fine focal image compared to broad focal image, the result was 62% of from the asked group evaluated fine focal spot image better than broad focal spot size image were 28% of from the asked group evaluated fine focal spot size image same quality to broad focal spot size image and 10% from the asked group evaluated broad focal spot size image better than fine focal spot size image. The result is same as in previous study, the relative large part of the study (28% + 10%) that presents broad focal images is same quality and better than fine focal spot may be due to the digital image processing.