COMPUTED TOMOGRAPHYCOMPUTED TOMOGRAPHY

DR DR BENCZIKBENCZIK, , JUDITJUDIT

PRINCIPLESPRINCIPLES

UUSESSES XX--RAYSRAYS

MMULTIPLEULTIPLE SLICESSLICESAXIALAXIAL IMAGESIMAGES

CCOMPUTEROMPUTER MANIPULATIONMANIPULATION

RRECONSTRUCTIONECONSTRUCTION

JB/CTJB/CT

ADVANTAGESADVANTAGES OF CT OF CT

AXIAL IMAGESAXIAL IMAGES

3D RECONSTRUCTION POSSIBLE3D RECONSTRUCTION POSSIBLE

THICKNES- AND VOLUME THICKNES- AND VOLUME MEASUREMENTMEASUREMENT

BEST METHOD TO VISUALIZE BONE BEST METHOD TO VISUALIZE BONE

AND GASAND GAS

ARTHROGRAPHY POSSIBLEARTHROGRAPHY POSSIBLE

JB/CTJB/CT

ADVANTAGESADVANTAGES OF CT OF CT

DIGITAL IMAGE DIGITAL IMAGE view on computerview on computer

VARIABLE WINDOWS VARIABLE WINDOWS tissue specifictissue specific

GOOD RESOLUTIONGOOD RESOLUTION:: 1mm 1mm

NO SUPERIMPOSITIONNO SUPERIMPOSITION

FASTFASTJB/CTJB/CT

DISADVANTAGESDISADVANTAGES OF CT OF CT

IONIZINGIONIZING RADIATIONRADIATION

SEDATIONSEDATION OR OR ANESTHESIAANESTHESIA NEEDED NEEDED

MOTMOTIONION

LIMITED TISSUELIMITED TISSUE C CHARACTERIZATIONHARACTERIZATION

EXPENSIVE AND TIME CONSUMINGEXPENSIVE AND TIME CONSUMING

JB/CTJB/CT

EVALUATIONEVALUATION

CT NUMBER / HOUNSFIELD UNIT CT NUMBER / HOUNSFIELD UNIT ((HUHU))

-1000 to +3000 (normalized to-1000 to +3000 (normalized to H H22OO))

FAT/FLUID/SOFT TISSUE: -300 to +300FAT/FLUID/SOFT TISSUE: -300 to +300

HU of HHU of H22O = 0O = 0 BONEBONE // METAL: up to +3000METAL: up to +3000

CONTRAST AGENTSCONTRAST AGENTS air air // gas gas: -1000: -1000 I I // Ba: +3000 Ba: +3000

JB/CTJB/CT

PULMONARY PARENCHYMAPULMONARY PARENCHYMA

MEDIASTINUMMEDIASTINUM

lymph nodes, vessels, thymus, lymph nodes, vessels, thymus,

esophagus, tracheaesophagus, trachea

THORACIC WALL THORACIC WALL

soft tissues, vertebrae, ribs, soft tissues, vertebrae, ribs,

sternum, pleurasternum, pleura

HEART AND VASCULATUREHEART AND VASCULATURE

CLINICAL INDICATIONSCLINICAL INDICATIONS

JB/CTJB/CT

CNS, BONESCNS, BONES, , JOINTSJOINTS

PARENCHYMAPARENCHYMAL ORGANS (ABDOMEN):L ORGANS (ABDOMEN):

liver, spleen, pancreasliver, spleen, pancreas, , kidneyskidneys,,

adrenal glands, adrenal glands, lymphlymph nodes nodes

URINARY SYSTEM URINARY SYSTEM

VASCULATUREVASCULATURE

TUBULAR ORGANS: TUBULAR ORGANS: GI tractGI tract

ABDOMINAL WALLABDOMINAL WALL: : soft tissuessoft tissues

CLINICAL INDICATIONSCLINICAL INDICATIONS

JB/CTJB/CT

INTERPRETATIONINTERPRETATION

NNOMENCLATURE OMENCLATURE TTERMINOLOGYERMINOLOGY FFINDINGS:INDINGS: 1.1.SIZESIZE

2.2.SHAPESHAPE3.3.NUMBERNUMBER4.4.LOCATIONLOCATION5.5.MARGINATIONMARGINATION6.6.HUHU

JB/CTJB/CT