硬x射线位相衬度成像的实验分析

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1、窒壁墨型查兰堡主兰竺笙苎一一——Theteststudyofhardx-rayofphasecontrastimagingAbstractBackgroundsandobjectiveSincethediscoveryofx。raysbyConradRontgenin1895，almostallthepracticalusesofradiographyforhumanimaginghavebeenbasedonX．rayabsorbfioncontrastandopticgeometric．Thisabsorbtioncontrastimagingutilizedthehighpene

2、trabilityofX—ray，whenitpassthroughanobjectalonedifferentpathswillbedifferentiallyabsorbedandtheintensitypattemoftheemergingbeamrecordsthedistributionofabsorbingmaterialswithinthesample．thismethedcangivethematerialsinnerinformationwhichotherscannotsupply．eventhrough，asthesofttissuewhichbasedonlig

3、htelementsbecausethesofttissueonlyhavelittleabsorbtionornoabsorbtionorhavelittlediffrentialinabsorbtionSOitonlyinvestigatedfewinformationwithinsofttissue．in1965，doctorBonse．Ufind，forlightelements，e．g．carbon，hydrogen，oxygen，nitrogen．，thecrosssectionofthephaseshiftis1000timeslargerthanthatofabsorb

4、tion，itmeansthesensitivityofthismethodisaboutathousandtimeslargerthantheabsorbtioncontrast，indicatingthepossibilityofobtainingequivalentinformationaboutanobject，withaconsiderablyreducedabsorbeddose．ascomparedwithabsorbtionimaging．thistechniqueshaveadvantagestoimagethe，internalstructureofthicksam

5、ple，atthesametimeitcallimprovetheresolutiongreatlyandreachseveralmicron．wimtheadventofsynchrotronradiationfacility,thisphasecontrastimagingtechniquesgointorealityandgainedhighattation．atpresent，thistechniquesaboutphasecontrastimaginghaveimprovedgreatlyandphsecontrast—CTisavailable．inOLlrcountryi

6、tisinitial，inthisarticleweintroduceourtestthatperfomedinBeijingsynchrotronradiationfacility(BSRF)，severalbiologicalobjectwereusedinthistestandobtainedphasecontrastimaging．thequality&thisimagingwereanalysisedandcomparedwiththatabsorbtionimagingSOthattofindthedifferencebetweenthattwoimaging．Method

7、sweperformedsomeexperimentstoobtainphasecontrastimagingsand7安徽匿科大学硕士学位论文absorbtioncontrastimagingsofseveraldifferentbiologicalobjectsinBeijingsynchrotronradiationfacility(BSRF4WIA)．theobjectincludesmallaquariumgoldfish，phyma