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Quantitative analysis of the image layer in the region of rotational panoramic radiography



Quantitative analysis of the image layer in the region of rotational panoramic radiography



Aichi-Gakuin Journal of Dental Science 26(4): 691-710



In rotational panoramic radiography, it is essential for dental practitioners to understand accurately the two dimensional position of the image layer. There are many subjective or objective methods to evaluate the image layer. In 1983, McDavid et al. calculated the modulation transfer function (MTF) theoretically to analyse the image quality in the rotational panoramic radiography, but did not try to elucidate the MTF experimentally. Therefore, the MTFs of the image layer in the anterior region were measured under four combinations of screen, film and primary slit width, using the slit method with digital Fourier transform. Vera View (J. Morita Corp., Japan) was employed as a panoramic x-ray apparatus. The following were the combinations of screen, film and primary slit width; Par Speed/XRP; 1.7 mm, Hi Screen/RX; 1.4 mm, Hi Plus/XRP; 1.1 mm, PS-II/RX; 0.8 mm. In order to define the image layer, the information transfer factor (ITF) was calculated by integrating the squared MTF from 0 to 10 cycles/mm at each position of the anterior region. The measured image layer obtained by this study was compared with the calculated one. The results were summarized as follows; 1. The ITF value in the center of the image layer decreased in the following order, Par Speed/XRP; 1.7 mm, Hi Screen/RX; 1.4 mm, PS-II/RX; 0.8 mm and Hi Plus/XRP; 1.1 mm. 2. When the limit of the layer was defined as 75% of the ITF, the measured image layer became thick in the order, Hi Plus/XRP; 1.1 mm, PS-II/RX; 0.8 mm, Par Speed/XRP; 1.7 mm and Hi Screen/RX; 1.4 mm. 3. In all of the measured image layers, the center was not positioned on the middle of the layer but was displaced 0.5 mm on the average towards the tube side. 4. The image layer obtained by this study was in fair agreement with the theoretical one.

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