CAJ | 학술논문

目的基于FBCT、CBCT水模体模拟膀胱显示体积的准确性和稳定性.方法用已知体积的硬壁水模体和软壁水模体模拟膀胱.FBCT由2排Hispeed dual CT、64排Lightspeed VCT螺旋CT扫描,各自据螺距或床速分别扫描.CBCT据曝光条件分别pelvis、pelvis spotlight、high quality head 扫描.每种扫描5次后于TPS重建分析体积差异并与真实值对比,对两种模体结果行独立样本t检验.结果重建体积与真实值偏差硬壁模体FBCT为-(1.5～0.2)％,CBCT为-(5.1～2.9)％,软壁模体FBCT为-(4.2～0.1)％,CBCT为-(4.0～0.3)％.FBCT重建体积随螺距或床速增加而减小,Hispeed重建体积大于Lightspeed(硬壁水模体和软壁水模体的P=0.010和0.004).CBCT扫描pelvis模式重建体积最小(硬壁水模体和软壁水模体的P=0.020、0.013和0.006、0.008).结论 FBCT和CBCT扫描体积相近且均有良好重复性.对于活动性器官(呼吸、充盈等运动)FBCT扫描推荐少排慢扫描模式,CBCT扫描推荐pelvis spotlight和high quality head模式.
목적 기우FBCT、CBCT수모체모의방광현시체적적준학성화은정성.방법 용이지체적적경벽수모체화연벽수모체모의방광.FBCT유2배Hispeed dual CT、64배Lightspeed VCT라선CT소묘,각자거라거혹상속분별소묘.CBCT거폭광조건분별pelvis、pelvis spotlight、high quality head 소묘.매충소묘5차후우TPS중건분석체적차이병여진실치대비,대량충모체결과행독립양본t검험.결과 중건체적여진실치편차경벽모체FBCT위-(1.5～0.2)％,CBCT위-(5.1～2.9)％,연벽모체FBCT위-(4.2～0.1)％,CBCT위-(4.0～0.3)％.FBCT중건체적수라거혹상속증가이감소,Hispeed중건체적대우Lightspeed(경벽수모체화연벽수모체적P=0.010화0.004).CBCT소묘pelvis모식중건체적최소(경벽수모체화연벽수모체적P=0.020、0.013화0.006、0.008).결론 FBCT화CBCT소묘체적상근차균유량호중복성.대우활동성기관(호흡、충영등운동)FBCT소묘추천소배만소묘모식,CBCT소묘추천pelvis spotlight화high quality head모식.
Objective To study accuracy and stability of bladder mold volume using fan beam CT (FBCT) and kilovoltage cone-beam CT (CBCT).Methods The water bladder molds in 2 categories:hard and soft water wall molds (1 group and 3groups),scanned by FBCT and CBCT.FBCT was scanned by 2 rows of Hispeed dual and 64 rows of Lightspeed VCT spiral scan,then it was divided into two groups according to the pitch/speed of bed.CBCT was scanned by pelvis,pelvis spotlight and high quality head scan.Every scan repeated 5 times,then compared reconstruction volume with the real volume,analyzing stability and repetition by treatment planning system and the results of two phantoms by using independent sample t test.Results The deviation which compared the hard wall phantom with the real value was FBCT:-(1.5-0.2) ％,CBCT:-(5.1-2.9) ％.The deviation of soft wall molds,FBCT:-(4.2-0.1) ％,CBCT:-(4.0-0.3)％.Reconstruction volume of FBCT decreases with the increase of motion speed and pitch of bed,the volume of Hispeed was greater than the Lightspeed (hard wall molds,P =0.010 and soft wall molds,P =0.004).Among CBCT modes,the pelvis one had the smallest reconstruction volume (hard wall molds:CBCTH vs.CBCTP,P =0.020,CBCTP vs.CBCTPS P =0.013 and soft wall molds:CBCTH vs.CBCTP,P =0.006,CBCTP vs.CBCTPS P =0.008.).Conclusions Reconstruction volume of FBCT and CBCT have no statistical difference,and both of them have a good repeatability.Slow scan mode is recommended when using FBCT for active organ (respiration,filling and so on).Pelvis spotlight and high quality head protocols are recommended when using CBCT scanning.