[Report on the 89th Scientific Assembly and Annual Meeting of the Radiological Society of North America--evaluation of spatial resolution and contrast resolution for MPR diagnosis].
OBJECTIVE
The advent of the helical scanner and the multi-slice helical scanner has encouraged image diagnosis using MPR display. In this study we investigated methods of evaluating spatial and contrast resolution when using MPR image display.


METHODS
Using a three-dimensional ladder phantom to evaluate spatial resolution, we placed ladders along the MPR sections and measured the responses in the CT values. For evaluating contrast resolution, we used a phantom involving subtle differences in the CT values. We then found the CNR of those CT image.


RESULTS
The results of the experiment showed that when the FOV value, collimation and helical pitch were set at 240 mm, 0.5 mm, 3 and 320 mm, 1.0 mm, 3 respectively, good MPR display were achieved with respect to both spatial resolution and contrast resolution.


CONCLUSIONS
Image diagnosis using MPR display is an extremely useful method of diagnosis from an anatomical perspective. We were able to get better understanding through this investigation of the scanning parameter that optimizes time resolution and contrast resolution when using MPR display. LO: The advent of the helical scanner and the multi-slice helical scanner has encouraged image diagnosis using MPR display. In this study we investigated methods of evaluating spatial and contrast resolution when using MPR image display.
Fujii
Kenji
K
Department of Radiology, Daido Hospital.
D036542:Tomography, Spiral Computed / Q000379:methods*