Effect of helical pitch and collimation on tumor contrast and slice profile in helical CT imaging

Hui Hu; Stanley H. Fox

doi:10.1117/12.208350

8 May 1995 Effect of helical pitch and collimation on tumor contrast and slice profile in helical CT imaging

Hui Hu, Stanley H. Fox

Author Affiliations +

Proceedings Volume 2432, Medical Imaging 1995: Physics of Medical Imaging; (1995) https://doi.org/10.1117/12.208350
Event: Medical Imaging 1995, 1995, San Diego, CA, United States

Abstract

In this paper, we present and validate a model that describes directly how the resulting object contrast in CT images is affected by (1) the x-ray collimation, (2) the table speed or helical pitch, (3) the size of the object, (4) the axial distance of the object to the reconstructed slice, (5) the distance of the object to the axis of rotation, and (6) the helical reconstruction algorithm employed. This model helps evaluate the trade-off between different helical scanning strategies and facilitates the selection of the optimal table speed and the x-ray collimation. With this model, the resulting tumor contrast can be predicted for given techniques. Besides the contrast, this model also provides the slice sensitivity profile. Several clinically important conclusions derived from this model are discussed.

Citation Download Citation

Hui Hu and Stanley H. Fox "Effect of helical pitch and collimation on tumor contrast and slice profile in helical CT imaging", Proc. SPIE 2432, Medical Imaging 1995: Physics of Medical Imaging, (8 May 1995); https://doi.org/10.1117/12.208350

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