中华放射医学与防护杂志
中華放射醫學與防護雜誌
중화방사의학여방호잡지
Chinese Journal of Radiological Medicine and Protection
2014年
2期
145-148
,共4页
徐辉%王建超%尉可道%岳保荣
徐輝%王建超%尉可道%嶽保榮
서휘%왕건초%위가도%악보영
辐射着色胶片%峰值皮肤剂量%能量响应%剂量响应
輻射著色膠片%峰值皮膚劑量%能量響應%劑量響應
복사착색효편%봉치피부제량%능량향응%제량향응
Radiochromic film%Peak skin dose%Energy dependence%Dose response
目的 比较两种用于介入放射学程序中患者峰值皮肤剂量测量的胶片性能,包括胶片的灰度随时间变化、灵敏度、能量响应、剂量响应等特性.方法 分别在60、80、100、120和140 kV5档管电压下自由空气中照射GafChromic XR-RV3胶片和KODAK EDR2胶片800 mGy剂量,测量结果归一到80 kV分析胶片的能量响应.在模体上用80 kV管电压分别照射两种胶片0.025～10 Gy剂量,分析胶片的灵敏度和剂量响应.采用Epson V750平板扫描仪对两种胶片进行扫描分析,分另测量图像的红、绿、蓝3色通道的像素值.结果 在灰度随时间变化上,XR-RV3胶片在照射后的24 h内灰度的变化为2％,在72 h内为4％,在6周内为6％；低剂量时EDR2胶片比XR-RV3胶片更灵敏；能量响应方面,在放射诊断能量范围内,XR-RV3胶片的能量响应在9％以内,EDR2胶片的能量响应在23％以内；在0.025 ～10 Gy的剂量范围内,对于XR-RV3胶片,红光通道随剂量的变化曲线的响应最明显.对于EDR2胶片,3种颜色通道的像素值曲线重合,EDR2胶片在接受剂量超过500 mGy时达到饱和.结论 XR-RV3胶片在灰度变化、能量响应、剂量响应等方面要优于EDR2胶片,非常适和用于介入放射学程序中患者峰值皮肤剂量的测量和分析.
目的 比較兩種用于介入放射學程序中患者峰值皮膚劑量測量的膠片性能,包括膠片的灰度隨時間變化、靈敏度、能量響應、劑量響應等特性.方法 分彆在60、80、100、120和140 kV5檔管電壓下自由空氣中照射GafChromic XR-RV3膠片和KODAK EDR2膠片800 mGy劑量,測量結果歸一到80 kV分析膠片的能量響應.在模體上用80 kV管電壓分彆照射兩種膠片0.025～10 Gy劑量,分析膠片的靈敏度和劑量響應.採用Epson V750平闆掃描儀對兩種膠片進行掃描分析,分另測量圖像的紅、綠、藍3色通道的像素值.結果 在灰度隨時間變化上,XR-RV3膠片在照射後的24 h內灰度的變化為2％,在72 h內為4％,在6週內為6％；低劑量時EDR2膠片比XR-RV3膠片更靈敏；能量響應方麵,在放射診斷能量範圍內,XR-RV3膠片的能量響應在9％以內,EDR2膠片的能量響應在23％以內；在0.025 ～10 Gy的劑量範圍內,對于XR-RV3膠片,紅光通道隨劑量的變化麯線的響應最明顯.對于EDR2膠片,3種顏色通道的像素值麯線重閤,EDR2膠片在接受劑量超過500 mGy時達到飽和.結論 XR-RV3膠片在灰度變化、能量響應、劑量響應等方麵要優于EDR2膠片,非常適和用于介入放射學程序中患者峰值皮膚劑量的測量和分析.
목적 비교량충용우개입방사학정서중환자봉치피부제량측량적효편성능,포괄효편적회도수시간변화、령민도、능량향응、제량향응등특성.방법 분별재60、80、100、120화140 kV5당관전압하자유공기중조사GafChromic XR-RV3효편화KODAK EDR2효편800 mGy제량,측량결과귀일도80 kV분석효편적능량향응.재모체상용80 kV관전압분별조사량충효편0.025～10 Gy제량,분석효편적령민도화제량향응.채용Epson V750평판소묘의대량충효편진행소묘분석,분령측량도상적홍、록、람3색통도적상소치.결과 재회도수시간변화상,XR-RV3효편재조사후적24 h내회도적변화위2％,재72 h내위4％,재6주내위6％；저제량시EDR2효편비XR-RV3효편경령민；능량향응방면,재방사진단능량범위내,XR-RV3효편적능량향응재9％이내,EDR2효편적능량향응재23％이내；재0.025 ～10 Gy적제량범위내,대우XR-RV3효편,홍광통도수제량적변화곡선적향응최명현.대우EDR2효편,3충안색통도적상소치곡선중합,EDR2효편재접수제량초과500 mGy시체도포화.결론 XR-RV3효편재회도변화、능량향응、제량향응등방면요우우EDR2효편,비상괄화용우개입방사학정서중환자봉치피부제량적측량화분석.
Objective To study the dosimetric characteristics of two different radiochromic films used to estimate peak skin dose(PSD) of patients.The characteristics of these two films were investigated and compared after exposure to ionizing radiation in the diagnostic energy range,including post-exposure gray growth,sensitivity,energy dependence and dose response.Methods GafChromic XR-RV3 film and KODAK EDR2 film were exposed to air kerma 800 mGy free-in-air using five X-ray beam qualities (60,80,100,120 and 140 kVp) in a SSDL.The measurement for each energy was normalized to 80 kV to analyze energy dependence of films.The films were calibrated to different dose level (0.025-10 Gy) onphantom by 80 kV X-rays.The response curve were plotted to analyze sensitivity and dose response.The films were scanned with Epson V750 commercial flatbed scanner.Color channel analysis was performed.Results The post-exposure gray growth of XR-RV3 film was found to be fairly stable.The change were 2％,4％,6％ at 24 h,72 h and 6 weeks after exposure respectively.EDR2 film was found to be more sensitivity than XR-RV3 film in low dose.The energy response of the XR-RV3 film and EDR2 film were within 9％ and 23％ over the clinical diagnostic x-ray energies,respectively.In the dose range of 0.025-10 Gy,for the XR-RV3 film,the red channel with the dose response curve was most obvious.For EDR2 film,the pixel value of three color channels was coincident.The EDR2 film appeared to be saturated when receiving doses greater than 500 mGy.Conclusions The XR-RV3 film is superior to EDR2 film in gray growth,energy dependence,dose-response and other aspects.This film is very suitable for measuring and analyzing PSD of patients in interventional radiology procedures.
