Two ultrasound machines, one high-end and one ordinary, were compared in terms of their ability to reproduce low-contrast objects using the same probe. Images containing 4 mm objects of four different contrasts were collected from a greyscale phantom at 35-42 mm depth. Six observers participated in a 4-alternative forced choice study based on 120 images. At this certain depth and object size the proportion of correct responses was higher (statistically significant) for the high-end machine at three of four contrast levels, indicating the possibility to discriminate between ultrasound machines using a limited number of images of a greyscale phantom. However, the number of images and number of observers needed are larger than usually used for constancy control.
CITATION STYLE
Lorentsson, R., Hosseini, N., Johansson, J. O., Rosenberg, W., Stenborg, B., Månsson, L. G., & Båth, M. (2015). A 4-afc study comparing ultrasound machines using a greyscale phantom. In IFMBE Proceedings (Vol. 48, pp. 82–85). Springer Verlag. https://doi.org/10.1007/978-3-319-12967-9_22
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