Az egyoldali (unilateralis), nagyfoku terdizuleti artrozis szignifikansan befolyasolja a jaras parametereit, a jaras szabalyossagat es az egyensulyozo kepesseget. Jelen kutatas celja annak megallapitasa, hogy a hirtelen iranyvaltoztatas utani egyensulyozo kepesseget jellemző Lehr-fele csillapitasi szam hogyan valtozik meg a ketoldali (bilateralis), nagyfoku terdizuleti artrozisban szenvedő betegeknel. A vizsgalatokban 20 kontroll, 20 unilateralis es 20 bilateralis nagyfoku terdizuleti artrozisban szenvedő beteg vett reszt. Az egyensulyozo kepesseget ket es egy labon allva mert, hirtelen iranyvaltoztatasi tesztből meghatarozott Lehr-fele csillapitasi szammal jellemeztuk. Bilateralis terdizuleti artrozisban szenvedő betegeknel, az unilateralis terdizuleti artrozisban szenvedő betegekkel ellentetben nem volt szignifikans kulonbseg a ket labon, dominans labon es nem-dominans labon allva mert ertekek kozott. A ferfiak es a nők egyensulyozo kepessege kozott egyik betegcsoport eseten sem talaltunk szignifikans kulonbseget. A bilateralis terdizuleti artrozisban szenvedő betegek eseten a ket labon allas kozben mert ertekekből szamitott Lehr-fele csillapodasi szam szignifikansan kisebb, mint az unilateralis terdizuleti artrozisban szenvedő betegek es a kontrollcsoport eseten, ami arra enged kovetkeztetni, hogy ennel a csoportnal legnagyobb az eleses kockazata.
{"title":"Bilaterális, nagyfokú térdízületi artrózis hatása a hirtelen irányváltoztatás utáni egyensúlyozó képességre","authors":"Pethes Ákos, S. Gréta, Kiss M Rita","doi":"10.15289/bh.v9i1.223","DOIUrl":"https://doi.org/10.15289/bh.v9i1.223","url":null,"abstract":"Az egyoldali (unilateralis), nagyfoku terdizuleti artrozis szignifikansan befolyasolja a jaras parametereit, a jaras szabalyossagat es az egyensulyozo kepesseget. Jelen kutatas celja annak megallapitasa, hogy a hirtelen iranyvaltoztatas utani egyensulyozo kepesseget jellemző Lehr-fele csillapitasi szam hogyan valtozik meg a ketoldali (bilateralis), nagyfoku terdizuleti artrozisban szenvedő betegeknel. A vizsgalatokban 20 kontroll, 20 unilateralis es 20 bilateralis nagyfoku terdizuleti artrozisban szenvedő beteg vett reszt. Az egyensulyozo kepesseget ket es egy labon allva mert, hirtelen iranyvaltoztatasi tesztből meghatarozott Lehr-fele csillapitasi szammal jellemeztuk. Bilateralis terdizuleti artrozisban szenvedő betegeknel, az unilateralis terdizuleti artrozisban szenvedő betegekkel ellentetben nem volt szignifikans kulonbseg a ket labon, dominans labon es nem-dominans labon allva mert ertekek kozott. A ferfiak es a nők egyensulyozo kepessege kozott egyik betegcsoport eseten sem talaltunk szignifikans kulonbseget. A bilateralis terdizuleti artrozisban szenvedő betegek eseten a ket labon allas kozben mert ertekekből szamitott Lehr-fele csillapodasi szam szignifikansan kisebb, mint az unilateralis terdizuleti artrozisban szenvedő betegek es a kontrollcsoport eseten, ami arra enged kovetkeztetni, hogy ennel a csoportnal legnagyobb az eleses kockazata.","PeriodicalId":30208,"journal":{"name":"Biomechanica Hungarica","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48003157","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
P. Judit, Manó Sándor, Sohajda Ferenc, T. N. Judit
A lepes jarmod, a magasabb jarmodokkal ellentetben kevesbe vizsgalt, ertelmezett es kutatott mozgasforma, melynek oka talan a lovas- es loversenyek mogott allo jelentős finanszirozasban keresendő. A hippoterapia loval vegzett mozgasterapia, melynek soran lepes jarmodban dolgozunk, igy alapos ismerete es megertese kulcsfontossagu akezeleseredmenyessegeben. Munkank celja, hogy a lepes jarmodot elemeire bontsuk, kepileg konnyen erthetőve tegyuk, es az objektiv meresi adatokkal szinkron ketiranyu fazisazonositast vegezzunk. A merest egy ket elemes gyorsulasmerő segitsegevel vegeztuk nyolc gidran egyeden, lepes jarmodban, kezen vezetve. A kapott gyorsulasi adatokat osszesitve egy atlagos elmozdulasi gorbet kaptunk, melyre a lo előrehalado mozgasat illesztve beazonositottuk a korabban fazisaira bontott lepeselemeket. A kapott gorbe a lepesben halado lo hatmozgasanak előre es oldalra tortenő kitereset mutatja. A hippoterapiaval foglalkozo szakemberek a lepő lo mellett haladva leginkabb annak előrehalado mozgasat, torzsenek oldalra kilengeset erzekelik. Munkankkal, a kezeles kulcsanak, azaz a hat finom mozgasanak jobb megertesehez kerultunk kozelebb. Tovabbi celunk, hogy a mozgast szinkron video felvetellel, tobb meresi ponttal, nagyobb egyedszammal es egyeb lofajtakkal is elvegezzuk.
{"title":"A ló egy lépésciklusának nyolc periódusú képi megjelenítése és a marmozgások kétdimenziós gyorsulásaival való szinkronizálása","authors":"P. Judit, Manó Sándor, Sohajda Ferenc, T. N. Judit","doi":"10.15289/bh.v9i1.222","DOIUrl":"https://doi.org/10.15289/bh.v9i1.222","url":null,"abstract":"A lepes jarmod, a magasabb jarmodokkal ellentetben kevesbe vizsgalt, ertelmezett es kutatott mozgasforma, melynek oka talan a lovas- es loversenyek mogott allo jelentős finanszirozasban keresendő. A hippoterapia loval vegzett mozgasterapia, melynek soran lepes jarmodban dolgozunk, igy alapos ismerete es megertese kulcsfontossagu akezeleseredmenyessegeben. Munkank celja, hogy a lepes jarmodot elemeire bontsuk, kepileg konnyen erthetőve tegyuk, es az objektiv meresi adatokkal szinkron ketiranyu fazisazonositast vegezzunk. A merest egy ket elemes gyorsulasmerő segitsegevel vegeztuk nyolc gidran egyeden, lepes jarmodban, kezen vezetve. A kapott gyorsulasi adatokat osszesitve egy atlagos elmozdulasi gorbet kaptunk, melyre a lo előrehalado mozgasat illesztve beazonositottuk a korabban fazisaira bontott lepeselemeket. A kapott gorbe a lepesben halado lo hatmozgasanak előre es oldalra tortenő kitereset mutatja. A hippoterapiaval foglalkozo szakemberek a lepő lo mellett haladva leginkabb annak előrehalado mozgasat, torzsenek oldalra kilengeset erzekelik. Munkankkal, a kezeles kulcsanak, azaz a hat finom mozgasanak jobb megertesehez kerultunk kozelebb. Tovabbi celunk, hogy a mozgast szinkron video felvetellel, tobb meresi ponttal, nagyobb egyedszammal es egyeb lofajtakkal is elvegezzuk.","PeriodicalId":30208,"journal":{"name":"Biomechanica Hungarica","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45803580","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Az orvostechnikai kepalkotasi eljarasok kozott az erintesmentes vizsgalatok felhasznalasi kore egyre bővul, a melysegmeretek meghatarozasara szamtalan modszer ismert. Az ortopediai gyakorlatban emberi testresz alakjanak meghatarozasara, also hati deformaciok elemzesere, gerincferdules szűresere es utankovetesere alkalmazzak. Modszeruket tekintve specialis strukturak lekepezesen alapulnak. Az alabbiakban peldat mutatunk a műszaki gyakorlatban is alkalmazott profilometrias felvetlek felulet visszaallitas celjabol tortenő Fourier-modszeres feldolgozasara es a melysegi informacio pszeudo-moire kepekke valo alakitasara.
{"title":"Ortopédiai célú deflektrometriai képek Fourier-módszeres feldolgozása","authors":"Nochta Gergő, Antal Ákos","doi":"10.15289/bh.v9i1.214","DOIUrl":"https://doi.org/10.15289/bh.v9i1.214","url":null,"abstract":"Az orvostechnikai kepalkotasi eljarasok kozott az erintesmentes vizsgalatok felhasznalasi kore egyre bővul, a melysegmeretek meghatarozasara szamtalan modszer ismert. Az ortopediai gyakorlatban emberi testresz alakjanak meghatarozasara, also hati deformaciok elemzesere, gerincferdules szűresere es utankovetesere alkalmazzak. Modszeruket tekintve specialis strukturak lekepezesen alapulnak. Az alabbiakban peldat mutatunk a műszaki gyakorlatban is alkalmazott profilometrias felvetlek felulet visszaallitas celjabol tortenő Fourier-modszeres feldolgozasara es a melysegi informacio pszeudo-moire kepekke valo alakitasara.","PeriodicalId":30208,"journal":{"name":"Biomechanica Hungarica","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43266254","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
During the everyday life, our articulations are subjected to numerous different static and dynamic effects, in the structure of the human body they ensuring the proper attachment between the articulating bones. Within them, the various ligaments take care of the stability of the joints, their healthy functioning is essential even for ordinary daily activities. Due to the extremely serious consequences of their damage or rupture, medical science has aimed to find an adequate way to heal or replace them with natural or artificial tendons/ligaments, but so far (mostly the long term) results are not satisfactory at all. For the improvement of these procedures the better understanding and description of their mechanical behaviour is necessary. Our articulations (knee, ankle, hand and shoulder) show very difficult mechanical behaviour both from the point of loading conditions and material behaviour. Thus, the trustworthy numerical simulation of them is a very complex problem, on the top of the irregular geometry, both geometrical and material nonlinearities have to be taken into account. That is why real laboratory experiments are indispensable for the reliable numerical results. For this purpose, series of experiments have been performed on tendons and ligaments in the Biomechanical Laboratory of the BUTE. By the evaluation of the results different hyperelastic material models are parameterized and compared with the help of simple finite element models. On the basis of these models a three-dimensional numerical model is developed in Ansys, validated by real and numerical results. On this model, frequently occurring motions are investigated, focusing on the mechanical response of the major knee joints.
{"title":"Numerical modelling of human ligaments","authors":"Szakály Ferenc, Bojtár Imre, Szebényi Gábor","doi":"10.15289/BH.V9I1.216","DOIUrl":"https://doi.org/10.15289/BH.V9I1.216","url":null,"abstract":"During the everyday life, our articulations are subjected to numerous different static and dynamic effects, in the structure of the human body they ensuring the proper attachment between the articulating bones. Within them, the various ligaments take care of the stability of the joints, their healthy functioning is essential even for ordinary daily activities. Due to the extremely serious consequences of their damage or rupture, medical science has aimed to find an adequate way to heal or replace them with natural or artificial tendons/ligaments, but so far (mostly the long term) results are not satisfactory at all. For the improvement of these procedures the better understanding and description of their mechanical behaviour is necessary. Our articulations (knee, ankle, hand and shoulder) show very difficult mechanical behaviour both from the point of loading conditions and material behaviour. Thus, the trustworthy numerical simulation of them is a very complex problem, on the top of the irregular geometry, both geometrical and material nonlinearities have to be taken into account. That is why real laboratory experiments are indispensable for the reliable numerical results. For this purpose, series of experiments have been performed on tendons and ligaments in the Biomechanical Laboratory of the BUTE. By the evaluation of the results different hyperelastic material models are parameterized and compared with the help of simple finite element models. On the basis of these models a three-dimensional numerical model is developed in Ansys, validated by real and numerical results. On this model, frequently occurring motions are investigated, focusing on the mechanical response of the major knee joints.","PeriodicalId":30208,"journal":{"name":"Biomechanica Hungarica","volume":"9 1","pages":"7-15"},"PeriodicalIF":0.0,"publicationDate":"2016-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66902610","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-07-01DOI: 10.17489/BIOHUN/2016/1/06
J. Pálinkás, S. Manó, F. Soha, Judit T. Nagy
{"title":"Phase visualisation of the horse's single stride cycle in eight periods and its synchronization with the wither's two dimensional acceleration","authors":"J. Pálinkás, S. Manó, F. Soha, Judit T. Nagy","doi":"10.17489/BIOHUN/2016/1/06","DOIUrl":"https://doi.org/10.17489/BIOHUN/2016/1/06","url":null,"abstract":"","PeriodicalId":30208,"journal":{"name":"Biomechanica Hungarica","volume":"9 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68196958","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Takács Mária, R. Ervin, Kovács Attila, Orlovits Zsanett, Kiss M Rita
1024x768 A gyermekkori tartasvizsgalat soran gyakran felmerul az a kerdes, hogy indokolt-e rontgenvizsgalatot vegezni. Szűrővizsgalatoknal es barmilyen ellenjavallat eseten a rontgenfelvetel keszitese szoba sem johet, ekkor a fizikalis vizsgalat mellett non-invasive, alternativ vizsgalati lehetősegek kozul kell valasztani. A gyermekek gerincallapotanak a felmeresere a Spinal Mouse es az ultrahang-alapu Zebris gerincvizsgalo eszkoz egyarant jol hasznalhato.A kutatas elsődleges celja, hogy az iskolaskoru gyermekek sagittalis siku gerincgorbuleteit alternativ, non-invasive sugarterhelessel nem jaro vizsgalo modszerrel hatarozzuk meg: Az eletkor es a testmagassag fuggvenyeben a hati kyphosis (TK), az agyeki lordosis (LL), valamint a sagittalis siku torzsdőles (TTI) es a lateralis dőles (LI) normaltartomanyat 530 helyes (fiziologias) tartasu es 394 hanyag testtartasu 6-15 ev kozotti egeszseges gyermek eseten adjuk meg. Megallapithato, hogy a testmagassag szerinti (120 cm es 180 cm kozott 5 cm-enkent) normalertekek megadasa a celszerű. A kapott eredmenyek azt is mutatjak, hogy mind a helyes-, mind a hanyag testtartasu gyermekek eseten a fiuk es lanyok gerincalakjat jellemző parameterek kozott a kulonbseg szignifikans, azaz a normaltartomanyok megadasa a nemek szerinti bontasban indokolt. A vizsgalatok azt is bizonyitjak, hogy a normal (fiziologias) testtartasu es a hanyag testtartasu gyermekek osszehasonlitasakor a gerinc alakjat leiro ket szog (TK es LL) szignifikansan elterő. DOI: 10.17489/biohun/2015/2/05 Normal 0 21 false false false /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Normal tablazat"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;}
{"title":"Gyermekek sagittalis síkú gerincgörbületének felmérése ultrahang-alapú mozgásvizsgáló eszközzel","authors":"Takács Mária, R. Ervin, Kovács Attila, Orlovits Zsanett, Kiss M Rita","doi":"10.15289/BH.V8I2.200","DOIUrl":"https://doi.org/10.15289/BH.V8I2.200","url":null,"abstract":"1024x768 A gyermekkori tartasvizsgalat soran gyakran felmerul az a kerdes, hogy indokolt-e rontgenvizsgalatot vegezni. Szűrővizsgalatoknal es barmilyen ellenjavallat eseten a rontgenfelvetel keszitese szoba sem johet, ekkor a fizikalis vizsgalat mellett non-invasive, alternativ vizsgalati lehetősegek kozul kell valasztani. A gyermekek gerincallapotanak a felmeresere a Spinal Mouse es az ultrahang-alapu Zebris gerincvizsgalo eszkoz egyarant jol hasznalhato.A kutatas elsődleges celja, hogy az iskolaskoru gyermekek sagittalis siku gerincgorbuleteit alternativ, non-invasive sugarterhelessel nem jaro vizsgalo modszerrel hatarozzuk meg: Az eletkor es a testmagassag fuggvenyeben a hati kyphosis (TK), az agyeki lordosis (LL), valamint a sagittalis siku torzsdőles (TTI) es a lateralis dőles (LI) normaltartomanyat 530 helyes (fiziologias) tartasu es 394 hanyag testtartasu 6-15 ev kozotti egeszseges gyermek eseten adjuk meg. Megallapithato, hogy a testmagassag szerinti (120 cm es 180 cm kozott 5 cm-enkent) normalertekek megadasa a celszerű. A kapott eredmenyek azt is mutatjak, hogy mind a helyes-, mind a hanyag testtartasu gyermekek eseten a fiuk es lanyok gerincalakjat jellemző parameterek kozott a kulonbseg szignifikans, azaz a normaltartomanyok megadasa a nemek szerinti bontasban indokolt. A vizsgalatok azt is bizonyitjak, hogy a normal (fiziologias) testtartasu es a hanyag testtartasu gyermekek osszehasonlitasakor a gerinc alakjat leiro ket szog (TK es LL) szignifikansan elterő. DOI: 10.17489/biohun/2015/2/05 Normal 0 21 false false false /* Style Definitions */ \u0000 table.MsoNormalTable \u0000 {mso-style-name:\"Normal tablazat\"; \u0000 mso-tstyle-rowband-size:0; \u0000 mso-tstyle-colband-size:0; \u0000 mso-style-noshow:yes; \u0000 mso-style-parent:\"\"; \u0000 mso-padding-alt:0cm 5.4pt 0cm 5.4pt; \u0000 mso-para-margin:0cm; \u0000 mso-para-margin-bottom:.0001pt; \u0000 mso-pagination:widow-orphan; \u0000 font-size:10.0pt; \u0000 font-family:\"Times New Roman\"; \u0000 mso-ansi-language:#0400; \u0000 mso-fareast-language:#0400; \u0000 mso-bidi-language:#0400;}","PeriodicalId":30208,"journal":{"name":"Biomechanica Hungarica","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66902603","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Szemunk az egyik legfontosabb erzekszervunk egyike, ezert kiemelt fontossagu, hogy helyes műkodeset eletunk vegeig biztositsuk. Erre manapsag mar nagyon sokfele lehetőseg all rendelkezesre, hiszen a hagyomanyos segedeszkozokon kivul leteznek műteti eljarasok az eles latas fenntartasara. A sokfele műteti eljaras egyik fajtaja az inhartyat erinti. Szemeszeti lezer segitsegevel paranyi lyukakat kepeznek az inhartya megfelelő szegmenseibe, azzal a cellal, hogy az oregszeműseget orvosoljak, es visszaallitsak a szem termeszetes alkalmazkodokepesseget. Cikkunkben ennek a műteti eljarasnak a numerikus elemzeset mutatjuk be. Kiterunk a műteti eljaras műkodesenek elvere es kiserletet teszunk az eredeti műteti geometria modositasara a szemlencse hatekonyabb alkalmazkodasi szelessegenek elerese erdekeben. A kozolt eredmenyeket a numerikus vizsgalataink vegeredmenyeire alapoztuk. DOI: 10.17489/biohun/2015/2/03
{"title":"Az ínhártyát érintő lézeres látásjavító szemműtét végeselemes vizsgálata és elemzése","authors":"Bocskai Imre Zoltán, Bojtár Imre","doi":"10.15289/bh.v8i2.205","DOIUrl":"https://doi.org/10.15289/bh.v8i2.205","url":null,"abstract":"Szemunk az egyik legfontosabb erzekszervunk egyike, ezert kiemelt fontossagu, hogy helyes műkodeset eletunk vegeig biztositsuk. Erre manapsag mar nagyon sokfele lehetőseg all rendelkezesre, hiszen a hagyomanyos segedeszkozokon kivul leteznek műteti eljarasok az eles latas fenntartasara. A sokfele műteti eljaras egyik fajtaja az inhartyat erinti. Szemeszeti lezer segitsegevel paranyi lyukakat kepeznek az inhartya megfelelő szegmenseibe, azzal a cellal, hogy az oregszeműseget orvosoljak, es visszaallitsak a szem termeszetes alkalmazkodokepesseget. Cikkunkben ennek a műteti eljarasnak a numerikus elemzeset mutatjuk be. Kiterunk a műteti eljaras műkodesenek elvere es kiserletet teszunk az eredeti műteti geometria modositasara a szemlencse hatekonyabb alkalmazkodasi szelessegenek elerese erdekeben. A kozolt eredmenyeket a numerikus vizsgalataink vegeredmenyeire alapoztuk. DOI: 10.17489/biohun/2015/2/03","PeriodicalId":30208,"journal":{"name":"Biomechanica Hungarica","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66902606","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
K. Kristóf, László Négyessy, Fonta Caroline, Mokso Rajmund, Szepessy Zsuzsanna, Barsi Árpád
X-ray synchrotron tomographic microscopy enables the acquisition of large amount of images with a geometric and radiometric resolution sufficient for the morphometric and topologic analysis of vascular and even of microvascular network of different organs. In this study cylindrical shaped, NiDAB labelled brain samples of a diameter of half a millimeter were imaged and analyzed with an effective pixel size of 0.38 µm. Several thousands of tomographic slices build up each reconstructed volume meaning that an automatized analysis tool is indispensable. These big data sets are processed by the developed algorithms on commercially available PCs with an automated image analysis technology in acceptable processing time. The obtained vessel segments are stored for further topological and morphometric analyses or surface/volumetric visualization purposes. These analyses contain vessel feature distribution analysis followed by 3D reconstruction. The obtained results are in accordance to the literature data. DOI: 10.17489/biohun/2015/2/02 Normal 0 false false false EN-US X-NONE X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Normal tablazat"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin-top:0in; mso-para-margin-right:0in; mso-para-margin-bottom:8.0pt; mso-para-margin-left:0in; line-height:107%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri",sans-serif; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin;}
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In clinical practice, management of abdominal aortic aneurysms (AAA) is predominantly based on the diameter of the lumen. State-of-the-art fluid structure interaction (FSI) simulations have proven to be superior in estimating rupture risk, although they still have considerable shortcomings. In this paper we address one such unresolved problem, and present the outline of biomechanical material parameter distribution identification via inverse finite element (FE) analysis. Our method is based on the non invasive approximation of the displacement field using electrocardiogram-gated computer tomography angiography (ECG-gated CT-angiography, CTA) and estimating the load field with usual computational fluid dynamics (CFD) simulations. Parameters of our model connecting the two abovementioned sets of variables result from an optimization algorithm minimizing a work and energy related variational functional. Consequently, also supported by experimental measurements, we are able to assess local distribution of the biomechanical material properties of the arterial wall and give a functional characterization of vessel wall degeneration. DOI: 10.17489/biohun/2015/2/06 Normal 0 21 false false false HU X-NONE X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Normal tablazat"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-bidi-font-family:"Times New Roman";}
在临床实践中，腹主动脉瘤(AAA)的治疗主要是基于管腔的直径。最先进的流体结构相互作用(FSI)模拟在估计破裂风险方面已经被证明是优越的，尽管它们仍然存在相当大的缺点。在本文中，我们解决了这样一个尚未解决的问题，并提出了生物力学材料参数分布识别的轮廓，通过反有限元(FE)分析。我们的方法是基于使用心电图门控计算机断层扫描血管成像(ecg门控ct血管成像，CTA)对位移场的无创近似和使用通常的计算流体动力学(CFD)模拟估计负载场。连接上述两组变量的模型参数是由最小化功和能量相关变分函数的优化算法得到的。因此，在实验测量的支持下，我们能够评估动脉壁生物力学材料特性的局部分布，并给出血管壁变性的功能表征。DOI: 10.17489/biohun/2015/2/06 Normal 0 21 false false false HU X-NONE X-NONE /*样式定义*/表。mso-style-name:"Normal tablazat";mso-tstyle-rowband-size: 0;mso-tstyle-colband-size: 0;mso-style-noshow:是的;mso-style-priority: 99;mso-style-qformat:是的;mso-style-parent:“”;Mso-padding-alt:0cm 5.4pt;mso-para-margin: 0厘米;mso-para-margin-bottom: .0001pt;mso-pagination: widow-orphan;字体大小:11.0分;字体类型:“Calibri”、“无衬线”;mso-bidi-font-family:宋体;
{"title":"Multimodal biomechanical methods supporting abdominal aortic aneurysm management","authors":"N. Róbert, Bojtár Imre","doi":"10.15289/bh.v8i2.188","DOIUrl":"https://doi.org/10.15289/bh.v8i2.188","url":null,"abstract":"In clinical practice, management of abdominal aortic aneurysms (AAA) is predominantly based on the diameter of the lumen. State-of-the-art fluid structure interaction (FSI) simulations have proven to be superior in estimating rupture risk, although they still have considerable shortcomings. In this paper we address one such unresolved problem, and present the outline of biomechanical material parameter distribution identification via inverse finite element (FE) analysis. Our method is based on the non invasive approximation of the displacement field using electrocardiogram-gated computer tomography angiography (ECG-gated CT-angiography, CTA) and estimating the load field with usual computational fluid dynamics (CFD) simulations. Parameters of our model connecting the two abovementioned sets of variables result from an optimization algorithm minimizing a work and energy related variational functional. Consequently, also supported by experimental measurements, we are able to assess local distribution of the biomechanical material properties of the arterial wall and give a functional characterization of vessel wall degeneration. DOI: 10.17489/biohun/2015/2/06 Normal 0 21 false false false HU X-NONE X-NONE /* Style Definitions */ \u0000 table.MsoNormalTable \u0000 {mso-style-name:\"Normal tablazat\"; \u0000 mso-tstyle-rowband-size:0; \u0000 mso-tstyle-colband-size:0; \u0000 mso-style-noshow:yes; \u0000 mso-style-priority:99; \u0000 mso-style-qformat:yes; \u0000 mso-style-parent:\"\"; \u0000 mso-padding-alt:0cm 5.4pt 0cm 5.4pt; \u0000 mso-para-margin:0cm; \u0000 mso-para-margin-bottom:.0001pt; \u0000 mso-pagination:widow-orphan; \u0000 font-size:11.0pt; \u0000 font-family:\"Calibri\",\"sans-serif\"; \u0000 mso-bidi-font-family:\"Times New Roman\";}","PeriodicalId":30208,"journal":{"name":"Biomechanica Hungarica","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66902597","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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