منابع مشابه
A cluster randomised trial of cloth masks compared with medical masks in healthcare workers
OBJECTIVE The aim of this study was to compare the efficacy of cloth masks to medical masks in hospital healthcare workers (HCWs). The null hypothesis is that there is no difference between medical masks and cloth masks. SETTING 14 secondary-level/tertiary-level hospitals in Hanoi, Vietnam. PARTICIPANTS 1607 hospital HCWs aged ≥18 years working full-time in selected high-risk wards. INTER...
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Texture enhancement for medical images is the most important technique in medical image diagnosis. This paper introduces a texture enhancement technique for medical images by using fractional differential (FD) masks based on Srivastava-Owa fractional operators. We also construct a 2D isotropic gradient mask based on generalized fractional operators. Texture enhancement performance is measured b...
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An ideal coronagraph with a band-limited image mask can efficiently image off-axis sources while removing identically all of the light from an on-axis source. However, strict mask construction tolerances limit the utility of this technique for directly imaging extrasolar terrestrial planets. We present a variation on the basic band-limited mask design—a family of “notch filter” masks—that mitig...
متن کاملRespirators versus medical masks: evidence accumulates but the jury remains out
This edition of Influenza and other Respiratory Viruses sees the publication of a cluster randomised trial performed by Raina McIntyre and colleagues, which compares the relative effectiveness of medical (or surgical) masks and respirators to prevent respiratory infection in healthcare workers. The use of medical masks (MM) and respirators as methods of protection against influenza is complex a...
متن کاملThe efficacy of medical masks and respirators against respiratory infection in healthcare workers
OBJECTIVE We aimed to examine the efficacy of medical masks and respirators in protecting against respiratory infections using pooled data from two homogenous randomised control clinical trials (RCTs). METHODS The data collected on 3591 subjects in two similar RCTs conducted in Beijing, China, which examined the same infection outcomes, were pooled. Four interventions were compared: (i) conti...
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ژورنال
عنوان ژورنال: JAMA
سال: 2020
ISSN: 0098-7484
DOI: 10.1001/jama.2020.2331