CAJ | 학술논문

目的：分析同一厂家生产的不同型号DXA仪及使用不同年限DXA仪测量骨密度（ BMD ）的质量控制和效果评价。方法2008年和2012年分别对GE-Lunar制造的的DPX-L仪和Prodigy 仪行准确度（accuracy）和精确度（precision）测验。准确度试验仅测试作者自行研制的腰椎体模，精确度试验分别对腰椎体模、女性腰椎和DXA仪自带质量控制体模进行分析。所有测试均按照测量技术要求由同一技师操作。准确度试验为1 d内连续扫描腰椎体模10次，计算BMD测量值与体模真值的百分比。精确度试验分别以腰椎体模、厂家质量控制体模和女性腰椎为对象，每日测量1次，连续25次，计算变异系数（ CV ）。精确度测试中3个测量对象CV值的计算和应用方法略有差异。结果以BMD为描述指标，2008年DPX-L仪与Prodigy仪BMD准确度误差分别为0.80％和3.80％，差异有统计学意义（ P＜0.001）， Prodigy仪应用4年前后的准确度误差分别为3.80％和3.70％（ P＞0.05）。 DPX-L仪应用15年（至2008年）与Prodigy仪开始应用时（2008年）腰椎体模的精确度误差分别为1.88％和0.33％，差异有统计学意义（ P＜0.001）， DPX-L仪淘汰前精确度误差较Prodigy仪大5.6倍；女性腰椎精确度误差分析显示DPX-L仪的误差较Prodigy 仪大4.9倍。结论不同DXA仪及不同使用年限其准确度和精确度均不同，应重点关注不能校正的精确度。短期精确度较长期精确度的干扰因素少，可比性较强。
목적：분석동일엄가생산적불동형호DXA의급사용불동년한DXA의측량골밀도（ BMD ）적질량공제화효과평개。방법2008년화2012년분별대GE-Lunar제조적적DPX-L의화Prodigy 의행준학도（accuracy）화정학도（precision）측험。준학도시험부측시작자자행연제적요추체모，정학도시험분별대요추체모、녀성요추화DXA의자대질량공제체모진행분석。소유측시균안조측량기술요구유동일기사조작。준학도시험위1 d내련속소묘요추체모10차，계산BMD측량치여체모진치적백분비。정학도시험분별이요추체모、엄가질량공제체모화녀성요추위대상，매일측량1차，련속25차，계산변이계수（ CV ）。정학도측시중3개측량대상CV치적계산화응용방법략유차이。결과이BMD위묘술지표，2008년DPX-L의여Prodigy의BMD준학도오차분별위0.80％화3.80％，차이유통계학의의（ P＜0.001）， Prodigy의응용4년전후적준학도오차분별위3.80％화3.70％（ P＞0.05）。 DPX-L의응용15년（지2008년）여Prodigy의개시응용시（2008년）요추체모적정학도오차분별위1.88％화0.33％，차이유통계학의의（ P＜0.001）， DPX-L의도태전정학도오차교Prodigy의대5.6배；녀성요추정학도오차분석현시DPX-L의적오차교Prodigy 의대4.9배。결론불동DXA의급불동사용년한기준학도화정학도균불동，응중점관주불능교정적정학도。단기정학도교장기정학도적간우인소소，가비성교강。
Objective To analyze the quality control and evaluate different types dual X-ray absorptionmetry ( DXA) from the same manufacturer , and the same DXA in the different time of measuring the bone densitometry .Meth-ods Conduct the accuracy and precision tests with DPX-L and Prodigy from GE-Lunar in 2008 and 2012 respectively . Lumbar spine phantom designed by the authors was used in the accuracy tests .In the precision tests , the lumbar spine phantom, female lumbar spine and quality control phantom of the Prodigy were used .All the subjects were tested by the same technician under standard the technical requirements .The accuracy tests scanned the phantom for 10 times consecu-tively on the same day and calculate the percentage of the measured value and true value of bone mineral density ( BMD) . The precision tests scanned the lumbar spine phantom , female lumbar spine and quality control phantom once a day for consecutively 25 days, and calculate the coefficient of variation (CV).Results The BMD was used as the description indicator , and the accuracy errors of DPX-L and Prodigy were 0.80% and 3.80% ( P<0.001 ) in 2008 .The accuracy errors of Prodigy before and after the application were 3.80%and 3.70% ( P>0.05 ) .The precisions errors of DPX-L ( after the application of 15 years until 2008 ) and Prodigy ( started to use in 2008 ) were 1.88% and 0.33% ( P<0.001 ) .The precision error of DPX-L was 5.6 times bigger than that of Prodigy .Female lumbar spine scanning showed that the precision error of DPX-L was 4.9 times bigger than that of Prodigy (9.17%/1.89%).Conclusions The accu-racy and precision errors varies with the different types of DXA and with the different application time of the same DXA . The uncorrectable precision errors should be more concerned .Compared with the long-term precision , the short-term pre-cision had less confounders and stronger comparability .