重庆医科大学附属儿童医院II. Device and imaging propertiesChidren'sHospitalot Chongaing Medical UniversihyImaging properties of digital radiographyAdjustableSubtractionSplicingLowradiation dosesubtraction-avoiding tissue overlappingBone SubtrectedTissueShiactedSplicing function-large range imagingAdjusting function-large tolerance of filming conditions
II. Device and imaging properties ◼ Imaging properties of digital radiography ➢ Adjustable ➢ Subtraction ➢ Splicing ➢ Low radiation dose Splicing function-large range imaging Adjusting function-large tolerance of filming conditions subtraction-avoiding tissue overlapping
重庆医科大学附属儿童医院Ill. Methods of X-ray examinationChidren'sHospitalotChongaingMedicalUniversiFoundationforX-rayexaminationNatural contrast:natural density differences in human tissue structure福?Artificial contrast:Fortissues or organs thatlack natural contrast. substances witha工higher or lower density can be introduced to make artificial contrast.Methods of X-rayexam>Generalradiography（普通放射检查）>Specialradiography（特殊检查）>Contrastexamination（造影检查）
III. Methods of X-ray examination ◼ Foundation for X-ray examination ➢ Natural contrast：natural density differences in human tissue structure ➢ Artificial contrast：For tissues or organs that lack natural contrast, substances with a higher or lower density can be introduced to make artificial contrast. ◼ Methods of X-ray exam ➢ General radiography (普通放射检查) ➢ Special radiography (特殊检查) ➢ Contrast examination (造影检查)
重庆医科大学附属儿童医院Ill. Methods of X-ray examinationChidren's Hospital ot ChongaingMedicalUniversilyGeneral radiography> Imaging using natural contrast of human bodyFluoroscopy（透视）Radiography（plainfilm，X线摄影，平片）
III. Methods of X-ray examination Fluoroscopy (透视) Radiography (plain film, Ｘ线摄影, 平片) ◼ General radiography ➢ Imaging using natural contrast of human body
重庆医科大学附属儿童医院IIl. Methods of X-ray examinationChidren's Hospital ot Chongaing Medical UniversilSpecial radiographySoftX-rayradiography（软线摄影）：Usingamolybdenum（钼）target（tungsten钨Vtarget for ordinary X-ray) to produce soft X-ray with a longer wavelength for X-rayphotography, mainly for breast examination, also called molybd-target radiography(钼摄影）ormammography（乳腺摄影）
III. Methods of X-ray examination ◼ Special radiography ➢ Soft X-ray radiography(软线摄影)：Using a molybdenum (钼) target (tungsten钨 target for ordinary X-ray) to produce soft X-ray with a longer wavelength for X-ray photography, mainly for breast examination, also called molybd-target radiography(钼靶 摄影) or mammography (乳腺摄影)
重庆医科大学附属儿童医院Ill. Methods of X-ray examinationChidren's Hosoital ot Chongoing Medical UniversiContrastexaminationContrast examination:The contrast media is introduced into the organ or itssurrounding space to produce artificial contrast for imaging≥Contrast media：medical barium sulfate(医用硫酸钡)-gastroenterography；iodine(碘)-angiography and urographyContrast introduction pathwayV Direct introduction: oral-esophageal gastroenterography, injection-barium enema,retrogradeurography,puncture-angiogramVIndirect introduction: excretion urography, also called intravenous pyelography(IVP)
III. Methods of X-ray examination ◼Contrast examination ➢ Contrast examination：The contrast media is introduced into the organ or its surrounding space to produce artificial contrast for imaging. ➢ Contrast media：medical barium sulfate (医用硫酸钡)-gastroenterography；iodine (碘)-angiography and urography ➢ Contrast introduction pathway ✓ Direct introduction: oral-esophageal gastroenterography; injection-barium enema, retrograde urography; puncture-angiogram ✓Indirect introduction：excretion urography, also called intravenous pyelography(IVP)