?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=Phase+Contrast+Imaging+with+Coded+Apertures+Using+Laboratory-Based+X-ray+Sources&rft.creator=Ignatyev%2C+K&rft.creator=Munro%2C+PRT&rft.creator=Speller%2C+RD&rft.creator=Olivo%2C+A&rft.description=X%E2%80%90ray+phase+contrast+imaging+is+a+powerful+technique+that+allows+detection+of+changes+in+the+phase+of+x%E2%80%90ray+wavefronts+as+they+pass+through+a+sample.+As+a+result%2C+details+not+visible+in+conventional+x%E2%80%90ray+absorption+imaging+can+be+detected.+Until+recently+the+majority+of+applications+of+phase+contrast+imaging+were+at+synchrotron+facilities+due+to+the+availability+of+their+high+flux+and+coherence%3B+however%2C+a+number+of+techniques+have+appeared+recently+that+allow+phase+contrast+imaging+to+be+performed+using+laboratory+sources.+Here+we+describe+a+phase+contrast+imaging+technique%2C+developed+at+University+College+London%2C+that+uses+two+coded+apertures.+The+x%E2%80%90ray+beam+is+shaped+by+the+pre%E2%80%90sample+aperture%2C+and+small+deviations+in+the+x%E2%80%90ray+propagation+direction+are+detected+with+the+help+of+the+detector+aperture.+In+contrast+with+other+methods%2C+it+has+a+much+more+relaxed+requirement+for+the+source+size+(it+works+with+source+sizes+up+to+100+%CE%BCm).+A+working+prototype+coded%E2%80%90aperture+system+has+been+built.+An+x%E2%80%90ray+detector+with+directly+deposited+columnar+CsI+has+been+used+to+minimize+signal+spill%E2%80%90over+into+neighboring+pixels.+Phase+contrast+images+obtained+with+the+system+have+demonstrated+its+effectiveness+for+imaging+low%E2%80%90absorption+materials.&rft.publisher=American+Institute+of+Physics+(AIP)&rft.contributor=McNulty%2C+I&rft.contributor=Eyberger%2C+C&rft.contributor=Lai%2C+B&rft.date=2011-09-09&rft.type=Proceedings+paper&rft.publisher=10th+International+Conference+on+X-ray+Microscopy&rft.language=eng&rft.source=+++++In%3A+McNulty%2C+I+and+Eyberger%2C+C+and+Lai%2C+B%2C+(eds.)+Proceedings+of+the+10th+International+Conference+on+X%E2%80%90ray+Microscopy.++(pp.+pp.+254-257).++American+Institute+of+Physics+(AIP)%3A+Chicago%2C+IL%2C+USA.+(2011)+++++&rft.format=text&rft.identifier=https%3A%2F%2Fdiscovery.ucl.ac.uk%2Fid%2Feprint%2F1323175%2F1%2FOlivo_1.3625352.pdf&rft.identifier=https%3A%2F%2Fdiscovery.ucl.ac.uk%2Fid%2Feprint%2F1323175%2F&rft.rights=open