重庆医科大学附属儿童医院Ill. Methods of X-ray examinationChidren's Hospital ot Chongaing Medical Unversih)ContrastexaminationContrast introduction pathwayRetrogradeBariumurographyenemaExcretionCoronaryurographyOraladministrationofbarium angiography
III. Methods of X-ray examination Oral administration of barium Barium enema Coronary angiography Excretion urography Retrograde urography ◼Contrast examination ➢Contrast introduction pathway
重庆医科大学附属儿童医院IV.SafetyofX-rayexaminationChidren'sHospitalot Chongaing Medical UniversihyBiologicaleffectsofX-raycancauseradiationdamageMTheindicationsofX-ray examinations should be strictly controlledto avoidunnecessary radiation.射线检查X请使用个人防护用品MethodsofradiationprotectionShieldprotection（屏蔽防护）√Distanceprotection（距离防护）√Timeprotection（时间防护）招护有装防护用44
IV. Safety of X-ray examination ➢ Biological effects of X-ray can cause radiation damage. ➢ The indications of X-ray examinations should be strictly controlled to avoid unnecessary radiation. ➢ Methods of radiation protection ✓ Shield protection（屏蔽防护） ✓ Distance protection（距离防护） ✓ Time protection（时间防护）
重庆医科大学附属儿童医院V.Features ofX-rayimagesChidren'sHospitalotChongaingMedicalUnivershyThe black and white gravscale ofthe image reflects the density ofthe tissue.Highdensity-white shadow, Medium density-gray shadow, Low density-dark shadow The X-ray image is an image of overlapping tissues and structures
V. Features of X-ray images ➢ The black and white grayscale of the image reflects the density of the tissue. High density-white shadow; Medium density-gray shadow; Low density-dark shadow. ➢ The X-ray image is an image of overlapping tissues and structures
重庆医科大学附属儿童医院Sect. 2 computed tomography ( CT )Chidren's Hospital ot Chongaing Medical UnversihyI.Imaging principleII. Device and imaging propertiesIII.Examination methodsIV. Safety of CT imagingV. Image characteristics
Sect. 2 computed tomography（CT） I. Imaging principle II. Device and imaging properties III. Examination methods IV. Safety of CT imaging V. Image characteristics
重庆医科大学附属儿童医院I. Principle of CT imagingChidren'sHospitalotChongaingMedical Unversi>An X-raybeam is used to scan the cross section of the body.The detectorImngeerographiquesreceives the X-ray through the human body and converts it into digitalinformation,calculates thedigital information ofeach Voxel,andconstructsa digital matrix.The digital matrix is reconstructedintoagrayscale imageX1+X2=aX2X1+Y1=C3Y2YY1+Y2=b586Y1+Y2=d
I. Principle of CT imaging ➢ An X-ray beam is used to scan the cross section of the body. The detector receives the X-ray through the human body and converts it into digital information, calculates the digital information of each Voxel, and constructs a digital matrix. The digital matrix is reconstructed into a grayscale image. 5 9 6 8 X1+X2=a X1+Y1=c Y1+Y2=b Y1+Y2=d 2 3 4 5 X1 X2 Y1 Y2