{"corpus_id":32528137,"paper_sha":"064797b8f564e1bbbecb4ad0afff819d27daf84c","doi":"10.1103/PhysRevLett.107.048102","arxiv_id":"1009.4589","pmid":21867047,"pmcid":null,"mag_id":2034257162,"dblp_id":null,"acl_id":null,"title":"Determination of the defining boundary in nuclear magnetic resonance diffusion experiments.","year":2010,"publication_date":"2010-09-23","venue":"Physical Review Letters","journal":{"name":"Physical review letters","pages":"\n          048102\n        ","volume":"107 4"},"journal_issn":null,"journal_title":null,"publication_types":["JournalArticle"],"pubmed_pub_types":["Journal Article"],"s2_fields_of_study":["Medicine","Materials Science","Physics"],"reference_count":0,"citation_count":52,"influential_citation_count":2,"is_open_access":true,"arxiv_categories":["physics.med-ph","physics.chem-ph"],"arxiv_license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","arxiv_journal_ref":"Phys. Rev. Lett. 107, 048102 (2011)","mesh_headings":[{"d":"Diffusion","mj":true,"ui":"D004058"},{"d":"Fourier Analysis","mj":false,"ui":"D005583"},{"d":"Magnetic Resonance Spectroscopy","mj":false,"qs":[{"q":"methods","mj":true,"ui":"Q000379"}],"ui":"D009682"}],"chemicals":null,"comments_corrections":null,"source_flags":5,"s2_open_access_pdf_url":"http://arxiv.org/pdf/1009.4589","s2_open_access_landing_url":"https://www.semanticscholar.org/paper/064797b8f564e1bbbecb4ad0afff819d27daf84c","s2_open_access_license":null,"s2_open_access_status":"GREEN","pmc_open_access_pdf_url":null,"pmc_open_access_landing_url":null,"pmc_open_access_license":null,"pmc_open_access_status":null,"unpaywall_open_access_pdf_url":null,"unpaywall_open_access_landing_url":null,"unpaywall_open_access_license":null,"unpaywall_open_access_status":null,"abstract":"While nuclear magnetic resonance diffusion experiments are widely used to resolve structures confining the diffusion process, it has been elusive whether they can exactly reveal these structures. This question is closely related to x-ray scattering and to Kac's \"hear the drum\" problem. Although the shape of the drum is not \"hearable,\" we show that the confining boundary of closed pores can indeed be detected using modified Stejskal-Tanner magnetic field gradients that preserve the phase information and enable imaging of the average pore in a porous medium with a largely increased signal-to-noise ratio.","claims":[{"public_id":"cl_df808bc22a583f02f9e192ad83ecc475","status":"active","text":"Preserving phase information enables imaging of the average pore in a porous medium with a largely increased signal-to-noise ratio.","confidence":0.95,"contributors":[{"id":1,"public_id":"12632b8b5f","public_label":"Anonymous (12632b8b5f)","roles":["extraction"],"url":"https://sah.borca.ai/u/12632b8b5f"}],"url":"https://sah.borca.ai/claims/cl_df808bc22a583f02f9e192ad83ecc475"},{"public_id":"cl_895768fbc34bd43e0f72e11cfba9b70f","status":"active","text":"The boundary-detection question is closely related to x-ray scattering and Kac's \"hear the drum\" problem.","confidence":0.88,"contributors":[{"id":1,"public_id":"12632b8b5f","public_label":"Anonymous (12632b8b5f)","roles":["extraction"],"url":"https://sah.borca.ai/u/12632b8b5f"}],"url":"https://sah.borca.ai/claims/cl_895768fbc34bd43e0f72e11cfba9b70f"},{"public_id":"cl_bb3f9cd7f2f184e7dffd34d2a48cb2eb","status":"active","text":"The confining boundary of closed pores can be detected with nuclear magnetic resonance diffusion experiments when modified Stejskal-Tanner magnetic field gradients preserve phase information.","confidence":0.97,"contributors":[{"id":1,"public_id":"12632b8b5f","public_label":"Anonymous (12632b8b5f)","roles":["extraction"],"url":"https://sah.borca.ai/u/12632b8b5f"}],"url":"https://sah.borca.ai/claims/cl_bb3f9cd7f2f184e7dffd34d2a48cb2eb"}],"concepts":[{"public_id":"co_0d736c91c4ef20ed16ac20c7c220d9cc","status":"active","name":"phase information","description":"The phase of the NMR signal carried by the diffusing spins, used here to recover spatial 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occurs.","types":["material"],"aliases":[],"contributors":[{"id":1,"public_id":"12632b8b5f","public_label":"Anonymous (12632b8b5f)","roles":["extraction"],"url":"https://sah.borca.ai/u/12632b8b5f"}],"url":"https://sah.borca.ai/concepts/co_33768874cf437160a5bb9672ae04e0cc"},{"public_id":"co_4fd6f5e81ca9219801a75be0fe6287b3","status":"active","name":"closed pores","description":"Enclosed pore spaces that confine diffusing particles or spins.","types":["structure"],"aliases":["pores"],"contributors":[{"id":1,"public_id":"12632b8b5f","public_label":"Anonymous (12632b8b5f)","roles":["extraction"],"url":"https://sah.borca.ai/u/12632b8b5f"}],"url":"https://sah.borca.ai/concepts/co_4fd6f5e81ca9219801a75be0fe6287b3"},{"public_id":"co_55e3a81f252522ee5aeefdd5d34667d9","status":"active","name":"modified Stejskal-Tanner magnetic field gradients","description":"A gradient pulse sequence derived from the Stejskal-Tanner scheme and adjusted to preserve phase information.","types":["method","magnetic 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magnetic-field gradients.","types":["experimental method"],"aliases":["NMR diffusion experiments"],"contributors":[{"id":1,"public_id":"12632b8b5f","public_label":"Anonymous (12632b8b5f)","roles":["extraction"],"url":"https://sah.borca.ai/u/12632b8b5f"}],"url":"https://sah.borca.ai/concepts/co_744992104598b6999f1832c3e46048b5"},{"public_id":"co_a9af953273650b4e0d7b503ad67a6eab","status":"active","name":"Kac's \"hear the drum\" problem","description":"A mathematical inverse problem asking whether a shape can be determined from its vibrational spectrum.","types":["mathematical problem"],"aliases":["hear the drum problem"],"contributors":[{"id":1,"public_id":"12632b8b5f","public_label":"Anonymous (12632b8b5f)","roles":["extraction"],"url":"https://sah.borca.ai/u/12632b8b5f"}],"url":"https://sah.borca.ai/concepts/co_a9af953273650b4e0d7b503ad67a6eab"},{"public_id":"co_b3b28fdfdef7fe03162bd043add4f189","status":"active","name":"average pore","description":"An effective pore shape 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