Effect of AP diameter in patient dose during CT abdomen and chest.

Abstract

Computed tomography (CT) is considered the main source of radiation exposure to general population. There is an increased CT usage owing to technological advancement. Multiple slice CT scanners produce better image quality with less scan time and more clinical applications quality which linked to higher radiation dose to patients. This study is to investigate the relationships among cross-sectional diameters, weight and computed tomography (CT) dose descriptors (CTDI and DLP) to identify which is best used as a measure for the establishment of DRLs in CT. The importance of using the AP diameter are that it can easily be measured prior to scanning or retrospectively from previous CT images. A total of 65 patients were examined in this study. The data was collected from the following examinations: Abdomen and chest from Al-Amal national hospital (50 patients for abdomen and 15 patients for chest). Also this study was to identify an optimal cross-sectional chest - abdomen diameter that correlates with image quality and radiation exposure in MDCT examinations of the chest- abdomen performed with automatic tube current modulation. To measure the effective dose (ED) we use the equation = DLP× convoluted factor and it calculate the mean and standard deviation for any sample and multiply the result with DLP if the dose increase with increase of DLP we conclude that there’s reduction in radiation which come to patient