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KMID : 1001220070090020023
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Journal of the Korean Society of Digital Medical Imaging Technology
2007 Volume.9 No. 2 p.23 ~ p.30
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The Influence of the Change of Patient Radiation Exposure Dose Distribution on the Grid Condition and Detector Acquisition Dose on the Exposure Distance in the Use of Amorphous Silicon Thin Film Transistor Detector with AEC
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Yoon Surk-Hwan
Choi Jun-Ku
Han Dong-Kyoon
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Abstract
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This study attempts to propose an appropriate method of using digital medical imaging equipments, by studying the effects of automatic exposure control(AEC), grid ratio and the change of radiography distance on the patient dose and detertor acquisition dose during the procedure of acquiring image through a digital medical imaging detector. The change of dose following the change of grid ratio’s exposure and radiography distance was measured, by using an abdominal phantom organized with tissue equivalent materials in an amorphous silicon thin film transistor detecter installed with AWC. The case to use grid ratio 12 : 1, focal distance 180cm to radiography distance 110cm in AEC, the patient dose increased rather when we used grid ration 10 : 1, focal distance 110cm. When AEC was not used,the dose necessary for image acquisition decreased as the grid ratio became higher and the distance became further. but detector acquisition dose was not reduced when in applied AEC. When purchasing digiral medical imaging equipments, optional items such as AEC and grid shall be accurately selected to satisfy the use of the equipments. Radiography error made by radiation technologist and unnenessary patient dose can be reduced by selecting equipments with a radiography distance marker equipment when it did not apply AEC. These equipments can also be helpful in maintaining high imaging quality, one of the merits of digital detectors.
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KEYWORD
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Amorphous Silicon Thin Film Transistor Detecter, Grids, Focus distance, AEC, Patient dose
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