Radiographers’ perspectives’ on Visual Grading Analysis as a scientific method to evaluate image quality

Helle Precht, J Hansson, Claus Bjørn Outzen, P Hogg, A. Tingberg

Publikation: Bidrag til tidsskriftTidsskriftsartikelForskningpeer review


Introduction: Radiographers routinely undertake many initiatives to balance image quality with radiation
dose (optimisation). For optimisation studies to be successful image quality needs to be carefully
evaluated. Purpose was to 1) discuss the strengths and limitations of a Visual Grading Analysis (VGA)
method for image quality evaluation and 2) to outline the method from a radiographer's perspective.
Methods: A possible method for investigating and discussing the relationship between radiographic
image quality parameters and the interpretation and perception of X-ray images is the VGA method. VGA
has a number of advantages such as being low cost and a detailed image quality assessment, although it
is limited to ensure the images convey the relevant clinical information and relate the task based
Results: Comparing the experience of using VGA and Receiver Operating Characteristic (ROC) it is
obviously that less papers are published on VGA (Pubmed n¼1.384) compared to ROC (Pubmed
n¼122.686). Hereby the scientific experience of the VGA method is limited compared to the use of ROC.
VGA is, however, a much newer method and it is slowly gaining more and more attention.
Conclusion: The success of VGA requires a number of steps to be completed, such as defining the VGA
criteria, choosing the VGA method (absolute or relative), including observers, finding the best image
display platforms, training observers and selecting the best statistical method for the study purpose
should be thoroughly considered.
Implication for practice: Detailed evaluation of image quality for optimisation studies related to technical
definition of image quality.
StatusUdgivet - 5 aug. 2019