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KMID : 0384620070180030144
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Korean Journal of Medical Physics
2007 Volume.18 No. 3 p.144 ~ p.148
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Construction and Performance Evaluation of Digital Radiographic System
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Jo Hyu-Min
Nam So-Ra
Lee Chang-Re
Jung Ji-Young
Kim Hee-Joung
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Abstract
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Current digital radiography systems are rapidly glowing in clinical applications. The purpose of this study was to evaluate the characteristics of a mobile digital radiographic system. The performance of the mobile DR system was evaluated by measuring the modulation transfer function (MTF), noise power spectrum (NPS), and detective quantum efficiency (DQE). Measurements were made on a LISTEM Mobix-1000 generator and a Teleoptic PRA Alpha-R4000 detector. Imaging characteristics were measured for these two systems using the IEC-61267 defined RQA5 (kVp: 74, additional filtration: 21 mmAl) radiographic condition. The MTF at 10% was measured as 2.4 cycles/mm and the DQE(0) values for radiation exposure 0.19, 0.5, and 1.3 mR were measured as 54%, 55%, and 76%, respectively. The NPS curves gradually decreased at high spatial frequencies. This high DQE at low frequencies, may be useful for low frequency information. The results suggested that mobile DR system could be integrated with emergency ambulance system in teleradiologic imaging applications.
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KEYWORD
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Mobile digital radiography system, MTF, NPS, DQE
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