Preliminary study on the variation of qualitative analysis of spatial resolution radiological images with the observer and comparison with quantitative method

The qualitative analysis of typical image quality assessment images in routine QC tests is subjective and dependent on the type of monitor and viewing conditions. In this study, an image of a phantom of spatial resolution was evaluated by 11 medical physicists of the EBSERH network to determine the variation of results between observers and to compare with a quantitative method of determination of the MTF curve from the phantom bar standards. The results show that the variation between the observers was of up to 5 groups visualized (16 to 21), resulting in values of 2.8 to 4.5 pl / mm. The quantitative method resulted in an MTF value (5%) equal to 3.6 pl / mm. The results show that a quantitative method can be useful to compare with previous results performed by other people or when it is desired to compare responses of similar equipment in different institutions. (author)