: VirtualDose. Calculate Lens Dose in Variation CT Protocols Based on VirtualDose Software

Transcription

1 VirtualDose ; ; : : VirtualDose TM ( ) : ; ; : VirtualDose ; ; DOI doi: /j.issn x R445.3 A X(2015) Calculate Lens Dose in Variation Protocols Based on VirtualDose Software LIANG Bao-hui 12 LIU Hai-kuan 3 CHEN Zhi 1 XU Xie 13 1.School of Nuclear Science and Technology Universty of Science and Technology of China Hefei China; 2.Department of Medical Imaging Bengbu Medical College Bengbu China; 3. Institute of Radiation Medicine Fudan University Shanghai China Abstract: Objective To compare and analysis the lens dose in different protocols and to search the method to reduce the lens dose in scanning procedures. Methods The VirtualDose software was used to calculate the lenses dose in examination and simulate the variation scanners phantoms scanning parameters (pitch kvp mas beam collimation) to influence the lenses dose and analyze the result of simulation. Results Variations of manufactures and patients of age had a little influence for the lens dose and the main influence factors included kvp mas and pitch. It was positive correlation between the lens dose and kvp and beam collimation. The dose of eye lens was inversely proportion with pitch and proportion with mas. Conclusion In calculating the lens dose the VirtualDose software is similar with other researches. We can use the data to evaluate the dose of eye lens in child brain. There are many factors together determine the lens dose in examination. Radiology technicians selecting the appropriate scanning parameters and scanning scope is helpful to reduce the lens dose of patient. Key words: eye lens; radiation dose; examination tions Scientific Committee on the Effects of Atomic Radiation UNSCEAR) (International Commission on Radiological ProtectionICRP) (United Na- [1] ( ) (1985-) : yxwlx@126.com xgxu@ustc.edu.cn

2 VirtualDose [2] [9] ICRP 150 msv 15 msv ICRP103# [3] I- CRP msv 20 msv msv [4] [5] Hranitzky [6] TLD VirtualDose msv msv ; ; VirtualDose [7] ( ) VirtualDose TM VirtualDose GE VirtualDose TM [7-8] VirtualDose Fig.1 The Interface of The Virtualdose Software CHINESE JOURNAL OF MEDICAL PHYSICS Vol.32 No.2 Mar. 2015

3 . VirtualDose mas DI DI GE Siemens X T 1 DI mm DI D (Z) GE LightSpeed 16 Z N Pitch=1 80 kvp 100 T DI w [10] kvp 120 kvp 20 mm 10 mm 5 mm DI 100(C) mas~200 masdi vol / DI 100(P) 10 mm Pitch 100 mas DI vol 3 DI w =1/3(DI 100(C) +2DI 100(P) ) 3.1 DI vol = DI w Pich : DI w /100 mas DI vol [11] DI vol [12] 2 2 X DI w /100 1 Tab.1 The Parameters of Scanning are Selected in Common Scanner Tube voltage Tube current Beam collimation DI w (kvp) (mas) (mm) (cgy/100mas) GE lightspeed Philips Briliance Philips Briliance Siemens Sensation Toshiba Aquilion Siemens Sensation GE lightspeed V Fig.2 The Relationship Between the Eye Lens and Pitch 3 Fig.3 Dose of Eye Lens with Different Child Phantom

4 VirtualDose 4 ; 5 20 mm mm 5 mm Zhang [13] ; 2 ; DI vol /100 mas DI vol /100 mas 1.14 DI vol X X X ; ; ; GE LightSpeed kvp 100 kvp 120 kvp 4 kvp mas 5 DI w/100 mas Fig.4 The Dose of Eye Lens are Effected kvpmas and Beam Fig.5 Beam Collimation Width How to Effect The Dose of Eye Collimation Width Lens and DI w/100 mas 2 DI vol/ 100mAs Tab.2 The Dose of Eye Lens and DI vol/100 mas in Different Scanners Model GE lightspeed 16 Philips Philips Siemens Toshiba Siemens GE lightspeed V Briliance 16 Briliance 64 Sensation 16 Aquilion 16 Sensation 64 DI vol/100 mas Eye lens dose(mgy) CHINESE JOURNAL OF MEDICAL PHYSICS Vol.32 No.2 Mar. 2015

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