北京生物醫(yī)學(xué)工程

CT-SD16探測器輻射劑量測量原理和參數(shù)設(shè)定

Principal analysis on radiation dosimetry of CT-SD16 detector and its parameter setting

作者：鄭海亮李興東劉小麗馮樹理何寶新段叢漆毅

單位：首都醫(yī)科大學(xué)附屬北京世紀(jì)壇醫(yī)院(北京 100038)

分類號：

出版年·卷·期（頁碼）：2012·31·3（278-282）

摘要：

目的介紹了一種用半導(dǎo)體電離室測量多排CT輻射劑量的原理和方法，為完善我國現(xiàn)有醫(yī)療CT檢測規(guī)范提供技術(shù)信息。方法通過介紹X射線輻射劑量計(jì)Barracuda的測量原理和多排CT輻射劑量測量的參數(shù)設(shè)置依據(jù)，并結(jié)合在Philip Brilliance iCT 256機(jī)器上的應(yīng)用實(shí)例，闡述了用半導(dǎo)體電離室的探測器測量多排CT輻射劑量的關(guān)鍵技術(shù)。結(jié)果基于CT掃描參數(shù)合理設(shè)置探測器參數(shù)后，多排CT輻射劑量空間分布情況得以較好展示。100 mm長桿空氣電離室的測量范圍遠(yuǎn)小于多排CT線束覆蓋范圍，需要對多排CT輻射劑量測量方法和技術(shù)進(jìn)行更新。結(jié)論新型探測器有利于揭示多排CT輻射劑量的特性規(guī)律。

Objective A mechanism and method of multi-detector or multi-slice CT dosimetry based on semi-conductor slice ionization chamber was introduced to provide technical information for the existing medical CT inspection criterion in China. Methods Through the introduction of X-ray dosimeter Barracuda’s detection principle, the basis of relevant parameter setting, and the application examples of Philip Brillinace iCT 256, the key technologies of multi-slice CT dosimetry was expounded. Results The spatial distribution of CT radiation dosage could be illustrated well by the detector with the slice ionization chamber after proper parameter setting. A pencil ionization chamber with a length of 100 mm was not sufficient to cover the irradiating range by X-ray beam of multi-slice CT, which was expected to renew the detection technology of radiation dosage for multi-slice CT. Conclusions This new detector is helpful to reveal the characteristics of the radiation dosage regularity in multi-slice CT.

參考文獻(xiàn)：

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