Introduction to Grayscale Calibration and Related Aspects of Medical Imaging Grade Liquid Crystal Displays

Consistent presentation of digital radiographic images at all locations within a medical center can help ensure a high level of patient care. Currently, liquid crystal displays (LCDs) are the electronic display technology of choice for viewing medical images. As the inherent luminance (and thereby perceived contrast) properties of different LCDs can vary substantially, calibration of the luminance response of these displays is required to ensure that observer perception of an image is consistent on all displays. The digital imaging and communication in medicine (DICOM) grayscale standard display function (GSDF) defines the luminance response of a display such that an observer’s perception of image contrast is consistent throughout the pixel value range of a displayed image. The main purpose of this work is to review the theoretical and practical aspects of calibration of LCDs to the GSDF. Included herein is a review of LCD technology, principles of calibration, and other practical aspects related to calibration and observer perception of images presented on LCDs. Both grayscale and color displays are considered, and the influence of ambient light on calibration and perception is discussed

Large-scale transcriptome changes in the process of long-term visual memory formation in the bumblebee, Bombus terrestris

This work was supported by the earmarked fund for Modern Agro-industry Technology Research System (grant no. CARS-45-KXJ3), the National Natural Science Foundation of China (grant no. 31340061 and 31772684), the HFSP (grant no. RGP0022/2014) and funding from the China Scholarship Council and Queen Mary University of London

Self care in patients with chronic heart failure

Heart failure self care' refers to the practices in which patients engage to maintain their own health, and to the decisions that they make about managing signs or symptoms. In this article, we base our discussion of self care in chronic heart failure on the classification of patients as being 'expert', inconsistent', or 'novice' in heart failure self-care behaviors. The available literature on factors predicting heart failure self care and its outcomes are reviewed within this context. Factors known to influence heart failure self care include experience with the illness, physical functioning, depression and anxiety, social support, daytime sleepiness, and attitudes such as confidence. Further research is needed to understand the contributions of comorbidities, patient sex, and health disparities on heart failure self care. The evidence to support a link between heart failure self care and health outcomes is limited, but early evidence suggests that adequate self care is associated with an improvement in health status, a decrease in the number and duration of hospitalizations, and a decline in levels of biomarkers of stress and inflammation, and in intrathoracic impedance. Implications of heart failure self care for clinical practice, policy, and public health are also described