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KMID : 0357520090320030277
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Journal of Radiological Science and Technology
2009 Volume.32 No. 3 p.277 ~ p.283
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Effects of Settings in Dynamic Ranges and Frequency Modes on Ultrasonic Images
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Yang Jeong-Hwa
Kang Gwan-Suk
Lee Kyung-Sung
Paeng Dong-Guk
Choi Min-Joo
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Abstract
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It is important to get clinical ultrasonic images of good quality for accurate diagnosis. In this study, it observed the change of ultrasonic images against setting frequency, dynamic range(DR) and type of probes on ultrasonic scanner. In the experiment it evaluated image of LCS (Low Contrast Sensitivity) targets(-15, -6, -3, +3, +6, +15 dB) of a standard ultrasonic test phantoms(539,551, ATS, USA) similar to solid and cystic lesions. Its imaged from convex (C3-7IM) and linear probe (L5-12IM) on SA-9900 (Medison Ltd, Korea) scanner. The images obtained altering the setting parameters which are frequency(gen, pen, res, harmonic) mode and DR(). The quality of images evaluated compare with the nominal LCS value of target and measured LCS value. The results show that there was no significant changing of quality images altering DR 40, 60, 80, 100 dB against frequency in Convex probe but the image being the highest in LCS target at DR 60 dB, harmonic of frequency mode in the -15 dB target close to cystic lesion. In Linear probe, DR 40 dB, harmonic mode at -15 dB LCS target close to nominal value. It discussed necessity of evaluation about ROC(Receiver Operating Characteristic) from the psychological viewpoint and limit of evaluation from quantified images.
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KEYWORD
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Ultrasonic scanner, Frequency, DR(Dynamic Range), LCS(Low Contrast Sensitivity), Probe
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