Technical data on local CT practice in Western Australia were collected for five major CT providers using a self-completed questionnaire. The CTDIvol DLP and effective dose for each protocol were obtained and providers were ranked according to radiation burden for each clinical scenario. The mean, median, 75th percentile and standard deviation were calculated for both effective dose and DLP for...

In the screening and identifying of colon rectum malignancy, computed tomography colonography (CTC) is a highly effective imaging technique, albeit patients receiving significant dose. Accordingly, patient dose evaluation an important need, seeking to ensure benefits outweigh projected cancer risk. Objective: For CTC procedures carried out in Radiology Department, Medical Imaging Operation Serv...

Computed tomography (CT) images contribute to high-quality medical diagnosis, but radiation dose can be quite high, requiring accurate assessment. CT index (CTDI) was developed for dosimetric purposes, scanners operated exclusively in axial mode. Nowadays, CTDI underestimate patient helical exams. AAPM report TG111 (2010) suggested a new metric which the patient's is obtained from profiles cons...

Body CT scans are routinely performed using tube-current-modulation (TCM) technology. There is notable variability across CT manufacturers in terms of how TCM technology is implemented. Some manufacturers aim to provide uniform image noise across body regions and patient sizes, whereas others aim to provide lower noise for smaller patients. The purpose of this study was to conduct a theoretical...

Purpose: The purpose of this study was to preliminarily estimate patient-specific organ doses in chest CT examinations for Chinese adults, and investigate the effect patient size on doses. Methods: By considering body-size body-build effects taking mid-chest water equivalent diameter (WED) as a indicator, scan images 18 adults were acquired multi-detector generate regional voxel models. For eac...

Abstract Purpose Phantom studies in CT emphysema quantification show that iterative reconstruction and deep learning-based noise reduction (DLNR) allow lower radiation dose. We compared on ultra-low-dose (ULDCT) with without reduction, to standard-dose (SDCT) chronic obstructive pulmonary disease (COPD). Method Forty-nine COPD patients underwent ULDCT (third generation dual-source CT; 70ref-mAs...

Introduction: Quality assurance in Computed tomography (CT) centers in developing countries are largely hindered by the unavailability of CT phantoms. The development of a local CT phantom for the measurement of organ radiation absorbed dose is therefore requisite. Material and Methods: Local CT phantoms were designed to meet the standard criteria of 32 cm diameter for body, 16 cm diameter for...

OBJECTIVE To evaluate a quantitative method for individually adjusting the tube current to obtain images with consistent noise in electrocardiogram (ECG)-gated CT cardiac scans. MATERIALS AND METHODS The image noise from timing bolus and cardiac CT scans of 80 patients (Group A) who underwent a 64-row multidetector (MD) CT cardiac examination with patient-independent scan parameters were anal...