科研之友
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摘要
Introduction %26 Background: X-photons have an im-portant role in disease diagnosis in medical examina-tion by radiography. The correct employment of ra-diation reduces patients and radiographers over-exposure; it also increases half-life of the machine. In order to use high doses especially in bulky masses, over-exposure occurs for the patient. The aim of this study is to investigate varied rates of received doses in patients by two green and blue spectrum sensitive films. Patients %26 Methods: To determine differences be-tween the patients received doses, data were collected from conditions in which two sensitive films to green and blue spectrum were used. These data include, KV, mass, FFD, and radiation dose. Radiation dose was determined in terms of mili-rontgen per mili-ampere per minute. Results: Obtained results showed different rates in the two sensitive films. The greatest radiation for lat-eral lumbar, lumbar thoracic, maxillary or frontal si-nuses, abdomen and pelvis were 1218.37, 750.45, 574.2, 466.6 and 466.6 respectively. The lowest radia-tions for the same regions were 620.01, 519.84, 408.04, 285.1 and 245.76 respectively. Discussion: Our results revealed that radiation dose (mR) was significantly different between the two sensitive films to the green and blue spectrums. The reduction in green spectrum sensitive film was due to AgBr (I) emulsions and intensifying screen. Although the condition was meant to reduce exposure, image resolution and diagnostic power were also reduced. Therefore to obtain a high resolution image, blue spectrum sensitive films are sometimes used, resulting in patients over-exposure. In general, we suggest that in order to reduce exposure and get higher resolution, these two films can be used for radiography.
