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A mathematical algorithm for quantification of CT image noise
Author(s) -
Kerut Edmund K.,
To Filip,
Turner Michael,
McKinnie James,
Giles Thomas
Publication year - 2017
Publication title -
echocardiography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 62
eISSN - 1540-8175
pISSN - 0742-2822
DOI - 10.1111/echo.13389
Subject(s) - waist , noise (video) , image quality , image noise , wavelet , mathematics , standard deviation , region of interest , body mass index , algorithm , artificial intelligence , medicine , statistics , computer science , image (mathematics) , pathology
Quantification of computed tomography ( CT ) noise helps in determination of radiation dosage requirements for adequate image quality. Clinical methods used include calculation of the standard deviation ( SD ) of a selected region of interest ( ROI ). In industry, wavelet decomposition has been used for image compression while removing high‐frequency noise. We evaluated a cohort of 74 consecutive patients referred for coronary artery calcium scoring and quantitated noise within a 16×16 ROI in the ascending aorta using the traditional SD method and also using a two‐dimensional dyadic wavelet decomposition method. Clinically, noise has been shown to be proportional to patient weight and also body mass index ( BMI ), which is a derived value from height and weight. Noise for both methods was plotted against patient parameters of height, weight, waist circumference and calculated BMI . A regression line was calculated and coefficient of determination (CoD) calculated for each. The CoD was better for height, weight, and waist circumference using the wavelet method as compared to the traditional SD method. The wavelet method of quantification of image noise may be an improved method as compared to the SD method. This method could help further refine an imaging system's determination of radiation dosage requirements to obtain a satisfactory quality image.