critical flicker frequency


Also found in: Acronyms.

critical flicker frequency

[′krid·ə·kəl ′flik·ər ‚frē·kwən·sē]
(optics)
That frequency of an intermittent light source at which the light appears half the time as flickering and half the time as continuous.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Inhibitory control test, critical flicker frequency, and psychometric tests in the diagnosis of minimal hepatic encephalopathy in cirrhosis.
Critical flicker frequency for quantification of low-grade hepatic encephalopathy.
Value of the critical flicker frequency in patients with minimal hepatic encephalopathy.
Meta-analysis: the diagnostic accuracy of critical flicker frequency in minimal hepatic encephalopathy.
Critical flicker frequency test predicts overt hepatic encephalopathy and survival in patients with liver cirrhosis.
Patients were subjected to symptom analysis, clinical examination, laboratory investigations, psychometric tests and critical flicker frequency test to establish the current degree of encephalopathy.
Critical Flicker Frequency Test was more positive in the study group than the control group.
In addition, critical flicker frequency test was carried out in both the study groups and the results were compared for further analysis.
Critical Flicker Frequency Test was more positive in the study group than the control group and was found to be statistically significant values obtained as 0.000 indicating the higher significance when compared with the controls.
Both Critical Flicker Frequency (CFF) and Psychometric tests have been found out to be effective in detecting MHE.
Critical flicker frequency was correlated with NCT-A (r=-0.451; p<0.01), NCT-B (r=-0.366; p<0.01), LDT(r=-0.41; p<0.002), DST (r=0.31; p<0.01), and SDT (r=-0.34; p<0.01).
Demographic, clinical, and laboratory parameters of patients with cirrhosis Baselineparameters Cirrhosis (n=70) Sex (female/male) 38/32 Age (years) 58[+ or -]8 Education (years) 7.2[+ or -]3.1 WBC(x[10.sup.9]/L) 5.2[+ or -]2.1 Hb (g/dL) 12.7[+ or -]1.9 Platelets (x[10.sup.9]/L) 127.9[+ or -]70 ALT (U/L) 43.5[+ or -]36 AST (U/L) 55.5[+ or -]37.3 Albumin (g/dL) 3.7[+ or -]0.8 PT (sc) 15.4[+ or -]1.8 Child-Turcotte -Pugh Class Child A 45 (64.2%) Child B 15 (21.4%) Child C 10 (14.2%) CFF (Hz) 41.2[+ or -]2.8 WBC: white bloodcell; Hb: hemoglobin; AST: aspartate amino transferase; ALT: alanine amino transferase; PT: prothrombin time; CFF: critical flicker frequency test Table 2.
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