To Mask or Not to Mask?

Coded Mask Imagers when to use them – and when not

Coded mask imagers are among a class of high energy astronomical instruments in which spatial or temporal coding, or a combination of the two, allows ‘multiplexing’ of the detection process. In this way many ‘pixels’ of an image can be observed and measured simultaneously. In certain circumstances this gives an advantage in signal to noise ratio, compared with an alternative approach in which e...

Pinhole Mask Sensor a Pinhole Mask Sensor

Figure 1 shows an example of a light field camera with a pinhole mask in front of the sensor. If we look at the sensor in 1D and assume an total x-resolution of 900 pixels and a Θ resolution of 9, the local x resolution is 100. The disadvantages are therefore a loss in resolution and a loss of light, as most of the light gets blocked by the mask. Therefore, while this model is very clean on a t...

Folic Acid Supplementation: to Advise or not to Advise?

Behind the mask: the influence of mask-type on amygdala response to fearful faces.

In this study, we compared the effects of using neutral face masks vs non-face pattern masks on amygdala activity to masked fearful faces. Twenty-seven subjects viewed 18 s blocks of either fearful or happy faces masked with either neutral faces or patterns, while their brain activity was measured using functional magnetic resonance imaging. Results replicated increased amygdala activation to f...

A scavenging double mask to reduce workplace contamination during mask induction of inhalation anesthesia in dogs

BACKGROUND Workplace contamination by the use of volatile anesthetic agents should be kept to a minimum if a potential health hazard is to be minimised. Mask induction of animals is a common procedure. The present study investigates the efficiency of a novel scavenging double mask in reducing waste gas concentrations in the breathing zone of the anesthetist performing this procedure. METHODS ...