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Observer performance (Visual Grading Analysis-VGA) of medical image quality

The visual grading of the visibility/reproduction of normal anatomy or pathology is a valid
and commonly used approach to subjectively quantifying the quality of an image in medical
imaging (Seeram, Bushong, Davidson, & Swan, 2014).
Its application is based on how clearly the anatomical structures are visualised by an
observer, such as by asking an observer to rate the visibility and reproduction of details in
the clinical images. A human-based approach like this makes it a clinically relevant and
preferred way to assess the image quality (Smedby & Fredrikson, 2010). Also, the relevance
of the VGA for detectability of pathology has been investigated, and ultimately has assessed
there to be a strong correlation between the visibility of normal anatomy and the
detectability of pathological structures (Sund, M., Kheddache, & Månsson, 2004; Sund, Båth,
Kheddache, Tylén', & Månsson, 2000; Morán et al., 2004(.

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