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DD/Tratiodistance/thickness距离（X线管焦点到被照体入射缘）/（被照体厚度）比率dacryocystography泪囊鼻腔造瘘数damping阻尼，衰减darkdecay暗衰减dataacquisition数据采集dataaveraging数据平均databus数据总线dataconversion数据变换，数据转换datasampling数据采样datatransferrate数据转换率daughternuclide子体核素DEFGRdrivenequilibriumfastGRASS（gradient-echopulsesequence）激励均衡快速梯度回波脉冲序列deadtime停滞时间，空载时间，空耗时间，死时间deadzone静区，死区decayproduct衰变产物decayscheme衰变图，衰变纲图decentering偏离中心,使离心decibel(dB)分贝deconvolutionanalysis反卷积分析decoupling退耦（装置）defaecography排便造影，排粪造影definition清晰度，精确度delaycontrol延迟控制delaylinecancellor(DLC)延迟线消除器delayedcoincidencecounting延迟重合计数delayedsweep延迟扫描deletion删除，删除部分deltaconfiguration三角形结构deltaeffectδ效应deltafunctionδ函数deltarayδ射线demodulatedDopplersignal解调（检波）多普勒信号demodulation解调，检波demodulator解调器，检波器densitometer显微密度计，比重计densitometry密度计量学（研究摄影负片密度测量和结果数据的解释）densityequalizationfilter密度均衡滤过器densityrange密度范围dephasing移相，失相depthdose深度剂量depthpenetration深度渗透derivedunit导出单位detectedquantumefficiency(DQE)量子检出效能detectionefficiency探测效能detector探测器detectoraperture探测器孔径detectorarray探测器阵列detectorchannel探测器通道detectorcontrast探测器差异detectorwidth探测器宽度deuteriumMRimaging氘磁共振成像deuteriumMRspectroscopy氘磁共振波谱学developerinactivity显影液休止状态development显影developmentelectrode显影电极developmentreplenishmentsystem显影补充系统dewar杜瓦瓶,真空瓶diagnosticaccuracy诊断精确性，诊断正确度diagnostictube诊断用球管diamagnetism反磁性，逆磁性，反磁性学diaphragm控光装置，光圈diatrizoate泛影葡胺diethylenetriamine-pentaceticacid(dtpa)二乙撑三胺-五乙酸diffraction衍射diffractionanalysis衍射分解diffractionmottling衍射斑点diffusedensity漫射光密度diffusereflection漫反射diffusescattering漫散射diffusion散播，漫射，扩散diffusionanisotropy漫射各向异性diffusiongradient弥散梯度diffusionimaging弥散成像diffusionMRspectroscopy弥散磁共振波谱学diffusion-weightedSEecho-planarimaging弥散加权自旋回波平面回波成像digital数字的，数位的，手指的digitaldatatransfer数字数据转换器digitalFFTanalyser数字快速傅氏变换算法分析器digitalfluoroscopy(DF)数字透视digitalnumber数量digitalphotospotcamera数字聚光相机digitalradiography数字化X线摄影digitalscanconverter数字扫描转换器digitalspectralanalysis数字波谱分析digitalsubtractionangiography(DSA)数字减影血管造影digitalunsharpmasking数字晕光蒙片digital-to-analogueconverter(DAC)数模转换器digitization数字化dimericcontrastmedium二聚物对比剂diode二极管Dionosil丙碘酮的商品名，一种水溶性X线对比剂dipole双极子，偶极dipole-dipoleinteraction偶极-偶极相互作用directcurrent(DC)直流directexposurefilm直接曝光胶片directionalcounter方向计数器discernibleimage可辨别影像dischargetube放电管discography椎间盘造影术discriminator鉴别器,鉴定器disintegration瓦解，裂变，分解disk磁盘，磁碟片，圆盘displaymatrix显示矩阵displayedfieldofview显示视野disturbedflow受扰流动divergence发散,离散,散开Dixontwo-pointmethod狄克逊两点法Dopplerangle多普勒角Dopplerbeam多普勒线束Dopplereffect多普勒效应Dopplerequation多普勒方程Dopplerfrequencyshift多普勒频率变换Dopplershiftanalyser多普勒变换分析器Dopplersignal多普勒信号Dopplerultrasound多普勒超声dorsalmyelography脊髓造影,脊髓造影术dose剂量dosecalculation剂量计算dosecalibrator剂量校准器doseequivalent剂量当量，等效剂量doselimit剂量限制doserate剂量率dose-effectrelation剂量-效应关系dose-ratemeter剂量率仪dosimeter剂量测定器dosimetricquantity剂量测定量dosimetry剂量测量doublecontrastbariumexamination双对比钡检查doublecontrastcystography双对比膀胱造影术doublecontrastenema双对比灌肠剂doubleemulsionfilm双乳剂胶片double-filmradiography双胶片X线摄影术double-focustube双焦点球管drivenequilibrium驱动平衡dryingmark干燥斑痕，干燥不匀dryingprocess烘干过程DTPA一种常用的磁共振对比剂dualcontrol双重控制dualenergydigitalimaging双能量数字化成像dualenergyscannedprojectionradiography双能量扫描投射X线摄影术dualenergyscanning双能量扫描dualisotopestudy双同位素检查dualKvpradiography双电压X线摄影术dual-fieldimageintensifier双野影像增强器duplexscanning双向扫描dutycycle占空因数，填充系数，工作（负载）循环dynamicfocusing动态聚焦dynamicimaging动态成像dynamicpolarization动态偏振（现象）dynamicrange动态范围dynamicrangecontrolprocessing动态范围控制处理dynamicscanning动态扫描dynamictrackinglens动态跟踪透镜dynamicallyadaptivemrimaging动态适应磁共振成像dynode倍增器电极dysprosium(Dy)镝,元素符号Dydysprosium-DOTA镝与DOTA的螯合物dysprosium-DTPA-BMA镝与DTPA-BMA的螯合物EE-shortElscint公司推出一种的“再聚焦梯度回波脉冲序列”的商用名echotrain回波链echo-encephalography回波脑成像术echo-planarimaging(EPI)平面回波成像echo-planarMRangiography平面磁共振血管造影echocardiography心回波描记术，超声波心动描记术eddycurrent涡流，涡电流edgeenhancement边缘增强edgegradient边缘梯度edgegradienteffect边缘梯度效应edge-banddistribution边缘波段分布retedge-packing边缘压缩edge-spreadfunction(ESF)边缘扩散函数Edisoneffect爱迪生效应effectiveabsorptioncoefficient有效吸收系数effectivedetectoraperture有效探测器孔径effectivedose有效剂量effectivedoseequivalent有效剂量当量effectiveechotime有效回波时间effectivefocalspot有效焦点effectivegammarayactivity有效γ射线放射性effectiveradium(radon)content有效镭含量effectivewavelength有效波长ejectionfraction喷血分数,射血分数elasticscattering弹性散射electriccharge电荷electriccurrent电流electricdipole电偶极子electricfield电场electricforce电力electricgenerator发电机electricpotentialdifference电位差，电势差electricpower电力，电功率electromagnet电磁体electromagneticgenerator电磁发生器electromagneticradiation电磁辐射electromagneticwave电磁波electromotiveforce电动势electron电子electronbeam电子束electronbindingenergy电子结合能electroncapture(EC)电子捕获，电子俘获electroncascade电子级联electrondensity电子密度electrongun电子枪electronorbit电子轨道electronpair电子对electronparamagneticresonancespectroscopy电子顺磁共振波谱学electronshell电子壳electronspinresonance(ESR)电子自旋共振electronvolt(eV)电子伏特electron-holepair电子孔穴对electronicabsorptioncoefficient电子吸收系数electronicarray电子阵列electroniccharge电子电荷electroniccross-section电子有效截面electronicdetector电子探测器electronicfocusing电子聚焦electronicnoise电子噪声electronicshielding电子屏蔽electronicstereoimage电子立体影像electronictimer电子计时器elect