Validation and application of a perceptual difference model for keyhole MR imaging
1999
To optimize the many parameters in keyhole MR imaging, we validated and applied a human visual system (HVS) perceptual difference model (PDM) to simulated keyhole images. A series of full k-space images were acquired during the insertion of a needle into ex vivo bovine liver. Human observers rated the quality of images, and we compared ratings with the PDM output to validate and calibrate the model. In a second experiment, eight keyhole sequences were evaluated by the HVS PDM. A linear relationship with R/sup 2/=99.68% was found by regressing the model output versus human observer ratings. According to the perceptual model, the quality of the entire image is preserved most favorably with a stripe parallel to the direction of insertion. For a region of interest around the needle, a perpendicular stripe resulted in the lowest level of image error. Examination of rotating stripes of k-space show that a step of 45 degrees gives better image quality. Initial experience indicates that the HVS model is an objective, promising tool for the automated evaluation and optimization of keyhole imaging sequences.
Keywords:
- Correction
- Source
- Cite
- Save
- Machine Reading By IdeaReader
0
References
0
Citations
NaN
KQI