Assessment of dose exposure and image quality in coronary angiography performed by 640-slice CT: a comparison between adaptive iterative and filtered back-projection algorithm by propensity analysis.

PURPOSE: This study was performed to confirm, by propensity score matching, whether the use of adaptive-iterative dose reduction (AIDR 3D) with a built-in automatic exposure control system provides clinical and dosimetric advantages with respect to the traditional filtered back-projection (FBP) algorithm without automatic exposure modulation. MATERIALS AND METHODS: A total of 200 consecutive patients undergoing coronary computed tomography (CT) angiography on a 640-slice CT scanner were studied. A protocol with exposure parameters based on patient body mass index (BMI) and with images reconstructed using FBP (group A) was compared with a protocol with images acquired using tube current decided by an automatic exposure control system and reconstructed using AIDR (group B). Mean effective dose and image quality with both objective and subjective measurements were assessed. RESULTS: Mean effective dose was 23.6 % lower in group B than in group A (2.56 versus 3.34 mSv; p < 0.0001). Noise was significantly lower in group B with consequent higher signal-to-noise (SNR) and contrast-to-noise (CNR) (p < 0.0001) compared with group A. Subjective quality parameters were also significantly higher in group B. CONCLUSIONS: Comparative analysis by propensity score matching confirms that AIDR 3D with automatic exposure control is able to reduce significantly the mean radiation dose and improve the image quality compared with traditional FBP without exposure modulation.

Health-related characteristics and unmet needs of men with erectile dysfunction: a survey in five European countries.

INTRODUCTION: Data suggest that ED is still an underdiagnosed and undertreated condition. In addition, it seems that men with ED are unsatisfied about their relationship with their physician and with the available drugs. AIM: The study aims to identify health-related characteristics and unmet needs of patients suffering from erectile dysfunction (ED) in big 5 European Union (EU) nations (France, Germany, Italy, Spain, and UK). METHODS: Data were collected from the 2011 5EU National Health and Wellness-Survey on a population of 28,511 adult men (mean age: 47.18; SD 16.07) and was focused on men (5,184) who self-reported ED in the past 6 months. In addition, the quality of life (QoL) and work productivity/activity were explored. MAIN OUTCOME MEASURES: Health-related QoL (HRQoL) and work productivity were measured with SF-12v2 and WPAI validated psychometric tools. RESULTS: One in every 20 young men (age 18-39) across 5EU experienced ED in the past 6 months. About half of men (2,702/5,184; [52%]) with ED across all ages did not discuss their condition with their physician. Interestingly, among those men who did discuss their condition with their physician, 68% (1,668/2,465) do not currently use medication. These findings were more evident in the age group of 18-39 years. Only 48% (2,465/5,184) had a closer relationship with their physician, suggesting that this quality of relationship may be unsatisfactory. Compared with controls, ED patients have a significantly higher intrapsychic and relational psychopathological comorbid burden and relevant decreasing in HRQoL, with a significantly higher impairment on work productivity/activity. CONCLUSION: Data suggest that there is a need for a new therapeutic paradigm in ED treatment which images the achievement of a new alliance between physician and patient. Hence, alternative drug delivery strategies may reduce the psychological and social impact of this disease.