The International Journal of Engineering and Science (IJES) || Volume || 8 || Issue || 9 Series I || Pages || PP 57-64 || 2019 || ISSN (e): 2319 – 1813 ISSN (p): 23-19 – 1805 DOI:10.9790/1813-0809015764 www.theijes.com Page 57 Assessment of Patient Dose from CT Examinations in selected Hospitals in Abuja and Environs Iortile J. T 1 ., Agba E. H. 2 and Ige T.A 3 1 Department of Radiology, Benue State University Teaching Hospital Makurdi, Benue State, Nigeria. 2 Department of Physics, Benue State University Makurdi, Benue State, Nigeria 3 Department of Medical Physics, National Hospital, Abuja, Nigeria Corresponding Author: Iortile J. T --------------------------------------------------------------ABSTRACT--------------------------------------------------------- The computed tomography scanners were assessed using polymethyl methacrylate(PTW chamber type 30009, Freiburg, Germany) computed tomography phantoms, dose index for head and body were estimated(CTDIw) in this study and comparison made with corresponding console displayed doses(CTDIvol) together with their Dose Length Product(DLP). The study was performed on a Philips and Siemens Somatom Emotion computed tomography (CT) scanner systems. Dose measurements were made using 100 mm long pencil ion chamber connected to an electrometer with cylindrical CT dosimetry phantoms; head phantom (16-cm in diameter) and body phantom (32-cm in diameter) using scan technique of 120kVp,90kVp,110kVp and 130kVp with slice thickness of 3mm,5mm, 6mm and current-time products of 300mAs,200mAs,250mAs and 80 mAs were selected for charges of head and body phantoms for Philips CT simulator and Siemens 6 slice Somatom Emotion for the scan in axial mode, with a computed tomography dose index (CTDI vol ) console display of 19.03 and 10.8 at periphery and centre of the phantom and the estimated dose (CTDI w ) measurements of 19.13 and 12.12 for head and body phantom examination respectively for Philips CT simulator and computed tomography dose index (CTDI vol ) console display of 10.2 and 2.15 at periphery and centre of the phantom and the estimated dose (CTDI w ) measurements of 10.33 and 4.31 for head and body phantom examination for Siemens 6 slice Somatom Emotion respectively. Also, average DLP for head and body were recorded as 836mGy.cm and 335mGy.cm for Philips CT and 395 mGy.cm, 12.17 mGy.cm for head and body for Siemens 6 slice Somatom Emotion. With estimated doses for head of Philips CT simulator and Siemens 6 slice Somatom Emotion tomography deviations of 161.37%, 187.51 %, 119.55%, 384.03%, 432.43% and 306.58% and estimated displayed doses for body deviation of 106.27%,89.77%,9.24%,480.05%,433.64% and 155.22% for Philips CT simulator and Siemens 6 slice Somatom Emotion tomography compared with Shrimpton et al 1991,Breiki et al 2006 and Hidajat 1998 which were within the acceptable limits by International Diagnostic Reference Levels. KEYWORDS: Patient dose, Computed tomography, Dose index, Dose Length Product, Quality control --------------------------------------------------------------------------------------------------------------------------------------- Date of Submission: 07-09-2019 Date of acceptance: 26-09-2019 --------------------------------------------------------------------------------------------------------------------------------------- I. INTRODUCTION Computed tomography (CT) scan has emerged as a powerful tool for effective radiological diagnosis in a variety of diseases since it allows high-resolution three-dimensional images to be acquired in a short period of time. Computed tomography is very important in patient diagnoses and has been used in a variety of medical imaging procedures because of its unique ability to offer clear images of bone, muscle, blood vessels, and different types of tissue [1]. Where other imaging techniques are much more limited in the types of images they can provide. It can also be used to plan certain surgeries, guide biopsies, measure bone mineral density, detect injuries to internal organs, and has proven to be a valuable tool for the diagnosis and treatment of many musculoskeletal disorders. Computed tomography imaging is even used for the diagnosis and treatment of certain vascular diseases. Probably the most important aspect of computed tomography however, is its role in cancer treatment. It allows physicians to accurately detect and locate different types of cancers and plays an important part in radiation treatment planning process. Computed tomography is also used in combination with positron emission tomography systems, creating a hybrid technology to maximize patient imaging techniques. The importance of computed tomography technology is without doubt a vital aspect for the diagnosis and treatment of patients, and with new advancements in computed tomography continuing to develop; patient care will continue improving [1].Computed tomography has being recognized as administering high radiation dose to the patient, when compared to other diagnostic imaging modalities and this has raised concern over patient radiation doses[2].The expanding use of computed tomography (CT) worldwide has resulted in this modality