{"id":"https://openalex.org/W2169244701","doi":"https://doi.org/10.1109/ipdps.2004.1303277","title":"Scalable regularized tomography without repeated projections","display_name":"Scalable regularized tomography without repeated projections","publication_year":2004,"publication_date":"2004-06-10","ids":{"openalex":"https://openalex.org/W2169244701","doi":"https://doi.org/10.1109/ipdps.2004.1303277","mag":"2169244701"},"language":"en","primary_location":{"id":"doi:10.1109/ipdps.2004.1303277","is_oa":false,"landing_page_url":"https://doi.org/10.1109/ipdps.2004.1303277","pdf_url":null,"source":null,"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"18th International Parallel and Distributed Processing Symposium, 2004. Proceedings.","raw_type":"proceedings-article"},"type":"article","indexed_in":["crossref"],"open_access":{"is_oa":false,"oa_status":"closed","oa_url":null,"any_repository_has_fulltext":false},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5012919824","display_name":"Jonas August","orcid":null},"institutions":[{"id":"https://openalex.org/I74973139","display_name":"Carnegie Mellon University","ror":"https://ror.org/05x2bcf33","country_code":"US","type":"education","lineage":["https://openalex.org/I74973139"]}],"countries":["US"],"is_corresponding":false,"raw_author_name":"J. August","raw_affiliation_strings":["The Robotics Institute, Carnegie Mellon University, Pittsburgh, PA, USA"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"The Robotics Institute, Carnegie Mellon University, Pittsburgh, PA, USA","institution_ids":["https://openalex.org/I74973139"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5057924291","display_name":"Takeo Kanade","orcid":"https://orcid.org/0000-0002-6267-6853"},"institutions":[{"id":"https://openalex.org/I74973139","display_name":"Carnegie Mellon University","ror":"https://ror.org/05x2bcf33","country_code":"US","type":"education","lineage":["https://openalex.org/I74973139"]}],"countries":["US"],"is_corresponding":false,"raw_author_name":"T. Kanade","raw_affiliation_strings":["The Robotics Institute, Carnegie Mellon University, Pittsburgh, PA, USA"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"The Robotics Institute, Carnegie Mellon University, Pittsburgh, PA, USA","institution_ids":["https://openalex.org/I74973139"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":1,"corresponding_author_ids":[],"corresponding_institution_ids":["https://openalex.org/I74973139"],"apc_list":null,"apc_paid":null,"fwci":0.279,"has_fulltext":false,"cited_by_count":4,"citation_normalized_percentile":{"value":0.66619619,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":{"min":90,"max":94},"biblio":{"volume":null,"issue":null,"first_page":"232","last_page":"239"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T10522","display_name":"Medical Imaging Techniques and Applications","score":0.9998999834060669,"subfield":{"id":"https://openalex.org/subfields/2741","display_name":"Radiology, Nuclear Medicine and Imaging"},"field":{"id":"https://openalex.org/fields/27","display_name":"Medicine"},"domain":{"id":"https://openalex.org/domains/4","display_name":"Health Sciences"}},"topics":[{"id":"https://openalex.org/T10522","display_name":"Medical Imaging Techniques and Applications","score":0.9998999834060669,"subfield":{"id":"https://openalex.org/subfields/2741","display_name":"Radiology, Nuclear Medicine and Imaging"},"field":{"id":"https://openalex.org/fields/27","display_name":"Medicine"},"domain":{"id":"https://openalex.org/domains/4","display_name":"Health Sciences"}},{"id":"https://openalex.org/T10378","display_name":"Advanced MRI Techniques and Applications","score":0.9991000294685364,"subfield":{"id":"https://openalex.org/subfields/2741","display_name":"Radiology, Nuclear Medicine and Imaging"},"field":{"id":"https://openalex.org/fields/27","display_name":"Medicine"},"domain":{"id":"https://openalex.org/domains/4","display_name":"Health Sciences"}},{"id":"https://openalex.org/T10500","display_name":"Sparse and Compressive Sensing Techniques","score":0.9979000091552734,"subfield":{"id":"https://openalex.org/subfields/2206","display_name":"Computational Mechanics"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.6178200244903564},{"id":"https://openalex.org/keywords/algorithm","display_name":"Algorithm","score":0.5617464184761047},{"id":"https://openalex.org/keywords/tomography","display_name":"Tomography","score":0.5329813361167908},{"id":"https://openalex.org/keywords/computation","display_name":"Computation","score":0.4985783100128174},{"id":"https://openalex.org/keywords/iterative-reconstruction","display_name":"Iterative reconstruction","score":0.48236602544784546},{"id":"https://openalex.org/keywords/sparse-matrix","display_name":"Sparse matrix","score":0.46245741844177246},{"id":"https://openalex.org/keywords/speedup","display_name":"Speedup","score":0.459279328584671},{"id":"https://openalex.org/keywords/mathematical-optimization","display_name":"Mathematical optimization","score":0.44748103618621826},{"id":"https://openalex.org/keywords/projection","display_name":"Projection (relational algebra)","score":0.4453158676624298},{"id":"https://openalex.org/keywords/regularization","display_name":"Regularization (linguistics)","score":0.42538982629776},{"id":"https://openalex.org/keywords/computer-vision","display_name":"Computer vision","score":0.26407602429389954},{"id":"https://openalex.org/keywords/mathematics","display_name":"Mathematics","score":0.26245272159576416},{"id":"https://openalex.org/keywords/artificial-intelligence","display_name":"Artificial intelligence","score":0.2185787856578827},{"id":"https://openalex.org/keywords/parallel-computing","display_name":"Parallel computing","score":0.1153307557106018}],"concepts":[{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.6178200244903564},{"id":"https://openalex.org/C11413529","wikidata":"https://www.wikidata.org/wiki/Q8366","display_name":"Algorithm","level":1,"score":0.5617464184761047},{"id":"https://openalex.org/C163716698","wikidata":"https://www.wikidata.org/wiki/Q841267","display_name":"Tomography","level":2,"score":0.5329813361167908},{"id":"https://openalex.org/C45374587","wikidata":"https://www.wikidata.org/wiki/Q12525525","display_name":"Computation","level":2,"score":0.4985783100128174},{"id":"https://openalex.org/C141379421","wikidata":"https://www.wikidata.org/wiki/Q6094427","display_name":"Iterative reconstruction","level":2,"score":0.48236602544784546},{"id":"https://openalex.org/C56372850","wikidata":"https://www.wikidata.org/wiki/Q1050404","display_name":"Sparse matrix","level":3,"score":0.46245741844177246},{"id":"https://openalex.org/C68339613","wikidata":"https://www.wikidata.org/wiki/Q1549489","display_name":"Speedup","level":2,"score":0.459279328584671},{"id":"https://openalex.org/C126255220","wikidata":"https://www.wikidata.org/wiki/Q141495","display_name":"Mathematical optimization","level":1,"score":0.44748103618621826},{"id":"https://openalex.org/C57493831","wikidata":"https://www.wikidata.org/wiki/Q3134666","display_name":"Projection (relational algebra)","level":2,"score":0.4453158676624298},{"id":"https://openalex.org/C2776135515","wikidata":"https://www.wikidata.org/wiki/Q17143721","display_name":"Regularization (linguistics)","level":2,"score":0.42538982629776},{"id":"https://openalex.org/C31972630","wikidata":"https://www.wikidata.org/wiki/Q844240","display_name":"Computer vision","level":1,"score":0.26407602429389954},{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.26245272159576416},{"id":"https://openalex.org/C154945302","wikidata":"https://www.wikidata.org/wiki/Q11660","display_name":"Artificial intelligence","level":1,"score":0.2185787856578827},{"id":"https://openalex.org/C173608175","wikidata":"https://www.wikidata.org/wiki/Q232661","display_name":"Parallel computing","level":1,"score":0.1153307557106018},{"id":"https://openalex.org/C120665830","wikidata":"https://www.wikidata.org/wiki/Q14620","display_name":"Optics","level":1,"score":0.0},{"id":"https://openalex.org/C163716315","wikidata":"https://www.wikidata.org/wiki/Q901177","display_name":"Gaussian","level":2,"score":0.0},{"id":"https://openalex.org/C62520636","wikidata":"https://www.wikidata.org/wiki/Q944","display_name":"Quantum mechanics","level":1,"score":0.0},{"id":"https://openalex.org/C121332964","wikidata":"https://www.wikidata.org/wiki/Q413","display_name":"Physics","level":0,"score":0.0}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1109/ipdps.2004.1303277","is_oa":false,"landing_page_url":"https://doi.org/10.1109/ipdps.2004.1303277","pdf_url":null,"source":null,"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"18th International Parallel and Distributed Processing Symposium, 2004. Proceedings.","raw_type":"proceedings-article"}],"best_oa_location":null,"sustainable_development_goals":[],"awards":[],"funders":[],"has_content":{"pdf":false,"grobid_xml":false},"content_urls":null,"referenced_works_count":25,"referenced_works":["https://openalex.org/W108074482","https://openalex.org/W1549217911","https://openalex.org/W1586402789","https://openalex.org/W1595596071","https://openalex.org/W1873629055","https://openalex.org/W1974872296","https://openalex.org/W2049856752","https://openalex.org/W2052419043","https://openalex.org/W2058583833","https://openalex.org/W2099944953","https://openalex.org/W2107529027","https://openalex.org/W2117893569","https://openalex.org/W2126068349","https://openalex.org/W2130217200","https://openalex.org/W2142080545","https://openalex.org/W2142419873","https://openalex.org/W2146606394","https://openalex.org/W2167890826","https://openalex.org/W2168543121","https://openalex.org/W2498485724","https://openalex.org/W2565897894","https://openalex.org/W4239729298","https://openalex.org/W4285719527","https://openalex.org/W4299416517","https://openalex.org/W6604371152"],"related_works":["https://openalex.org/W2058965144","https://openalex.org/W2164382479","https://openalex.org/W98480971","https://openalex.org/W2150291671","https://openalex.org/W2027972911","https://openalex.org/W2146343568","https://openalex.org/W2013643406","https://openalex.org/W2157978810","https://openalex.org/W2597809628","https://openalex.org/W3046370962"],"abstract_inverted_index":{"Summary":[0],"form":[1],"only":[2],"given.":[3],"X-ray":[4,53],"computerized":[5],"tomography":[6,29,37,94,171],"(CT)":[7],"and":[8,74],"related":[9],"imaging":[10],"modalities":[11],"(e.g.,":[12],"PET)":[13],"are":[14,30],"notorious":[15],"for":[16,172],"their":[17],"excessive":[18],"computational":[19,56],"demands,":[20],"especially":[21],"when":[22],"noise-resistant":[23],"probabilistic":[24],"methods":[25,60],"such":[26],"as":[27],"regularized":[28,36,93,170],"used.":[31],"The":[32,55],"basic":[33],"idea":[34],"of":[35,80,83,138,142,149,169],"is":[38,100,135],"to":[39,70,106,174],"compute":[40,176],"a":[41,65,115,139,183,188],"smooth":[42],"image":[43,105],"whose":[44,153],"simulated":[45],"projections":[46],"(line":[47],"integrals)":[48],"approximate":[49],"the":[50,84,97,104,107,122,126,136],"observed,":[51],"noisy":[52],"projections.":[54],"expense":[57],"in":[58,92,95,121],"previous":[59],"stems":[61],"from":[62,103],"explicitly":[63],"applying":[64],"large":[66,140],"sparse":[67,128],"projection":[68,108,123],"matrix":[69],"enforce":[71],"these":[72],"smoothness":[73,98],"data":[75],"fidelity":[76],"constraints":[77],"during":[78],"each":[79],"many":[81,146],"iterations":[82,117],"algorithm.":[85],"Here":[86],"we":[87,161],"review":[88],"our":[89],"recent":[90],"work":[91],"which":[96],"constraint":[99],"analytically":[101],"transformed":[102],"domain,":[109,124],"before":[110],"any":[111],"computations":[112],"begin.":[113],"As":[114],"result,":[116],"take":[118],"place":[119],"entirely":[120],"avoiding":[125],"repeated":[127],"matrix-vector":[129],"products.":[130],"A":[131],"more":[132],"surprising":[133],"benefit":[134],"decoupling":[137],"system":[141],"regularization":[143],"equations":[144],"into":[145],"small":[147],"systems":[148],"simpler":[150],"independent":[151],"equations,":[152],"solution":[154],"requires":[155],"an":[156],"\"embarassingly":[157],"parallel\"":[158],"computation.":[159],"Here,":[160],"demonstrate":[162],"that":[163],"this":[164],"method":[165],"provides":[166],"linear":[167],"speedup":[168],"up":[173],"20":[175],"nodes":[177],"(Pentium":[178],"4,":[179],"1.5":[180],"GHz)":[181],"on":[182],"100":[184],"Mb/s":[185],"network":[186],"using":[187],"Matlab":[189],"MPI":[190],"implementation.":[191]},"counts_by_year":[{"year":2014,"cited_by_count":1},{"year":2012,"cited_by_count":1}],"updated_date":"2026-06-26T08:34:08.712188","created_date":"2025-10-10T00:00:00"}