CAJ | 학술논문

目的：本研究的目的是探讨首次接受低剂量MSCT筛查PPD阳性人群肺结核的应用价值。方法选择156例PPD阳性肺结核病人随机分成50mA、30m A、20m A三组行16排螺旋C T低剂量胸部扫描，扫描范围从肺尖至双肋膈角。然后对进行比较的病例使用设备默认条件进行常规扫描：扫描电压均为120K V、电流250m A、层厚7.5m m、螺距1.375：1、速度（m m/r o t）27.50。在工作站上对各组低剂量扫描和常规扫描肺内结核病灶的C T值标准偏差、噪声值以及表面入射剂量采用配对t检验法进行统计学比较分析。结果在肺结核病灶的CT影像学显示方面，低剂量组中50mA、30mA图像和常规剂量扫描图像相比无统计学差异（P>0.05），但20mA组少数体重较大病人影像噪声明显增加，影响了肺结核病灶的显示，与50mA、30mA低剂量组及常规剂量组相比有统计学差异（P<0.05）。常规剂量组及50mA、30mA、20mA低剂量组表面入射剂量分别为13.4mGy、2.72 mGy、1.63 mGy、1.09 mGy，低剂量组较常规剂量组分别降低了79.7%、87.9%、和91.8%。结论30mA胸部低剂量CT扫描完全可以取代常规剂量CT进行PPD阳性人群肺结核的筛查。
목적：본연구적목적시탐토수차접수저제량MSCT사사PPD양성인군폐결핵적응용개치。방법선택156례PPD양성폐결핵병인수궤분성50mA、30m A、20m A삼조행16배라선C T저제량흉부소묘，소묘범위종폐첨지쌍륵격각。연후대진행비교적병례사용설비묵인조건진행상규소묘：소묘전압균위120K V、전류250m A、층후7.5m m、라거1.375：1、속도（m m/r o t）27.50。재공작참상대각조저제량소묘화상규소묘폐내결핵병조적C T치표준편차、조성치이급표면입사제량채용배대t검험법진행통계학비교분석。결과재폐결핵병조적CT영상학현시방면，저제량조중50mA、30mA도상화상규제량소묘도상상비무통계학차이（P>0.05），단20mA조소수체중교대병인영상조성명현증가，영향료폐결핵병조적현시，여50mA、30mA저제량조급상규제량조상비유통계학차이（P<0.05）。상규제량조급50mA、30mA、20mA저제량조표면입사제량분별위13.4mGy、2.72 mGy、1.63 mGy、1.09 mGy，저제량조교상규제량조분별강저료79.7%、87.9%、화91.8%。결론30mA흉부저제량CT소묘완전가이취대상규제량CT진행PPD양성인군폐결핵적사사。
Objective To investigate the low dose MSCT in PPD positive people, the value of screening for pulmonary tuberculosis. Methods 156 cases of PPD positive patients with pulmonary tuberculosis were 16 row spiral CT chest scans, first use the device default conditions were routine scan : a scanning voltage is 120KV, current 250mA, thickness of 7.5mm, pitch 1.375 : 1, speed ( mm / rot ) 27.50, the scanning range from the apex to the double rib diaphragm angle. Were randomly divided into three groups in the region of the lesion were treated with conventional dose, 50mA, 30mA, 20mA scanning, the scanning conditions and conventional scanning completely consistent, on a workstation for conventional scanning and a variety of low dose scanning pulmonary tuberculosis CT value standard deviation, the value of the noise and the entrance surface dose using the paired t test method were statistical y compared analysis. Results In pulmonary tuberculosis CT imaging display, conventional dose scanning and low dose group in 50mA, 30mA showed no statistical difference ( P > 0.05 ), but 20mA group a weight larger patient image noise significantly increased, affecting the pulmonary tuberculosis showed, compared with conventional dose and low dose group compared to 50mA, 30mA there was statistical y significant difference ( P < 0.05 ). Conventional dose group and 50mA, 30mA, 20mA and low dose group of entrance surface dose were 13.4mGy, 2.72 mGy, 1.63 mGy, 1.09 mGy, low dose group than in conventional dose group were decreased by 79.7%, 87.9%, and 91.8%. Conclusions 30mA of thorax low dose CT scan can completely replace conventional doses of CT were PPD positive population tuberculosis screening.