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KMID : 1001220120140010037
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Journal of the Korean Society of Digital Medical Imaging Technology
2012 Volume.14 No. 1 p.37 ~ p.42
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Using Image J program, compared of focusing distance and grid rate
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Seo Won-Joo
Seo Jeong-Beom
Lee Jong-Woong
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Abstract
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Pediatric head and neck phantom, using the rate by focusing distance and grid images, Image J using the Quality Assessment and Dose Area Product compared. X-ray laboratory equipment due to the Philips Digital DIAGNOST a 110 cm FFD set and using ACE Non-grid, focusing distance 110 cm (12 : 1), 140 cm (12 : 1), 180 cm (8 : 1) Focused grid, Acryl Phantom (Fluke Model 76-2 Series Phantom) 15.24 cm, by resolution chart image acquisition, image evaluation program (Image J Ver. 1.4.3.67, USA) imaging experiments were analyzed using. Dose Area Product in the Non Grid 0.028 , focusing distance 110 cm (12 : 1), the 0.129 , 140 cm (12 : 1), the 0.135 , 180 cm (8 : 1) was measured with a 0.110 Non Grid, focusing distance 110 cm (12 : 1), 140 cm (12 : 1), 180 cm (8 : 1) Image obtained when grid using the image J program focusing distance 110 cm with grid based on the measured SNR and PSNR Non Grid if the SNR the 17.307 dB, PSNR of the 20.002 dB, if the SNR 28.755 dB, PSNR was measured by the 31.451 dB. Image J image analysis through the streets, rather than focusing on grid by the rate that could see an increase in dose. Select the grid by a small dose rate reduction is possible.
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KEYWORD
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SNR, PSNR, Focusing grid, DAP
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