OBJECTIVE To propose Irish CT diagnostic reference levels (DRLs) by collecting radiation doses for the most commonly performed CT examinations. METHODS A pilot study investigated the most frequent CT examinations. 40 CT sites were then asked to complete a survey booklet to allow the recording of CT parameters for each of 9 CT examinations during a 12-week period. Dose data [CT volume index (C...

(1) Background: The value of dual-energy CT angiography (DE-CTA) in the detection peripheral arterial disease (PAD) has been widely recognized. We aim to evaluate diagnostic accuracy virtual non-contrast (VNC) imaging DE-CTA compared true phase (TNC). (2) Methods: Our Internal Review Board (IRB) approved prospective study enrolled 40 patients (28 men, 12 women; median age 69 y, range 41–93 y) w...

Introduction: Increasing CT scan application increased the cancer risk in pediatrics in recent decays. Imaging centers approach for diagnosis of disease cause to different radiation dose to patients.  Because  of  rapid  pediatrics  body  growth,  the  most  important  challenge to determining the radiation dose is wide variations of size in different ages. Thus, we used Size...

BACKGROUND The technologic improvements in Multislice scanners include the increment in the X-ray beam width. Some new CT scanners are equipped with a 320 detector row which allows a longitudinal coverage of 160 mm and a total of 640 slices for a single rotation. When such parameters are used the length of the traditional pencil chamber (10 cm) is no more appropriate to measure the standard wei...

INTRODUCTION The aim of this study was to establish institutional diagnostic reference levels (DRLs) by summarising doses collected across the five computed tomography (CT) system in our institution. METHODS CT dose data of 15940 patients were collected retrospectively from May 2015 to October 2015 in five institutional scanners. The mean, 75th percentile and 90th percentile of the dose sprea...

PURPOSE To determine radiation doses from coronary computed tomographic (CT) angiography performed by using a 320-detector row volume scanner and evaluate how the effective dose depends on scan mode and the calculation method used. MATERIALS AND METHODS Radiation doses from coronary CT angiography performed by using a volume scanner were determined by using metal-oxide-semiconductor field-eff...

Iterative reconstruction can optimize radiation dose and improve image quality on CT scan. This research method is quantitative analytic with the analysis of results head examination parameters associated to changes in variations 80 kV, 100 120 kV use iterative reconstruction. Image measurements are Hounsfield Unit (HU) value, standard deviation, Signal Noise Ratio (SNR) using Radiant Viewers. ...