Estimation of Entrance Surface Dose and Image Quality Assessment of Adult Patients Undergoing Computed Radiography Examinations

Thumbnail Image

Date

2016-07

Journal Title

Journal ISSN

Volume Title

Publisher

University of Ghana

Abstract

The entrance surface dose (ESD) of radiographic examinations of adult patients undergoing computed radiography (CR) examinations have been estimated and image quality using ImageJ software version 1.48. In all 619 adult patients were involved in the study comprising 243 males and 376 females. The mean ESDs calculated were in the range of 0.29±0.0041 mGy to 6.08±0.55 mGy for chest PA, lumbar spine AP/LAT, cervical spine AP/LAT, skull AP/LAT and abdomen AP. All the results were lower compared with published results and diagnostic reference levels set by the IAEA and UK show except chest PA examination which the value estimated at UGH was by a factor of 2.56, 2.20 and 1.65 higher than the mean ESDs values by Inkoom et al, the IAEA and Public Health of UK respectively. An increment by factor of 3.07, 2.87 and 2.15 were found in the estimated mean ESDs for chest PA examination at KBTH for the published results respectively. Image quality of the radiographic images was assessed in terms of CNR and SNR. The CNR for all examinations were between 3.54±3.27 and 20.63±8.65 for all examinations. A maximum difference 17.09 in CNR was found between KBTH and UGH. The results obtained for SNR for both hospitals showed that 92.86% of all the images assessed were at least 1.22 higher than the Rose Model of the threshold value of ≥5. The study therefore has shown that the estimated mean ESD of the hospitals were within the recommended references values and the images were of good quality. Hence, there is the potential to reduce the dose to patients while keeping images of diagnostic quality.

Description

Thesis (MPhil) - University of Ghana, 2016

Keywords

Citation

Endorsement

Review

Supplemented By

Referenced By