Dathe, Henning

[["dc.bibliographiccitation.firstpage","45"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","ACTA OF BIOENGINEERING AND BIOMECHANICS"],["dc.bibliographiccitation.lastpage","53"],["dc.bibliographiccitation.volume","17"],["dc.contributor.author","Naegerl, Hans"],["dc.contributor.author","Dathe, Henning"],["dc.contributor.author","Fiedler, Christoph"],["dc.contributor.author","Gowers, Luiko"],["dc.contributor.author","Kirsch, Stephanie"],["dc.contributor.author","Kubein-Meesenburg, Dietmar"],["dc.contributor.author","Dumont, Clemens"],["dc.contributor.author","Wachowski, Martin Michael"],["dc.date.accessioned","2018-11-07T10:03:03Z"],["dc.date.available","2018-11-07T10:03:03Z"],["dc.date.issued","2015"],["dc.description.abstract","Purpose: In comparative examinations of kinematics of the knees of humans and pigs in flexional/extensional motion under compressive loads, the significant differential geometric essentials of articular guidance are elaborated to criticise the shaping of the articular surfaces of conventional knee-endoprostheses and to suggest constructional outlines that allow the endoprosthesis to adopt natural knee kinematics. Implantation is discussed with regard to the remaining ligamentous apparatus. Methods: Twelve fresh pig knee joints and 19 preserved human knee joints were moved into several flexional/extensional positions. In each joint, the tibia and femur were repeatably caught by metal plates. After removing all ligaments, the tibia and femur were again caught in these positions, and their points of contact were marked on both articular surfaces. Along the marker points, a thin lead wire was glued onto each surface. The positions and shapes of the four contact lines were mapped by teleradiography. Results: All contact lines were found to be plane curves. The medial and lateral planes were parallel, thus defining the joint's sagittal plane. In the human knee, as compared to the lateral, the medial femoral contact line was always shifted anteriorly by several millimetres. The tibial contact curve was laterally convex and medially concave. In the pig knees, the lateral and medial contact lines were asymmetrically placed. Both tibial curves were convex. Conclusions: Both knees represent cam mechanisms (with one degree of freedom) that produce rolling of the articular surfaces during the stance phase. Implantation requires preservation of the anterior cruciate ligament, and ligamentous balancing is disadvantageous"],["dc.identifier.doi","10.5277/ABB-00119-2014-02"],["dc.identifier.isi","000359730600005"],["dc.identifier.pmid","26400423"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/38364"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Wroclaw Univ Technology"],["dc.relation.issn","1509-409X"],["dc.title","The morphology of the articular surfaces of biological knee joints provides essential guidance for the construction of functional knee endoprostheses"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","669"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","Magnetic Resonance in Medicine"],["dc.bibliographiccitation.lastpage","677"],["dc.bibliographiccitation.volume","66"],["dc.contributor.author","Helms, Gunther"],["dc.contributor.author","Dathe, Henning"],["dc.contributor.author","Weiskopf, Nikolaus"],["dc.contributor.author","Dechent, Peter"],["dc.date.accessioned","2018-11-07T08:52:55Z"],["dc.date.available","2018-11-07T08:52:55Z"],["dc.date.issued","2011"],["dc.description.abstract","A novel linear parameterization for the variable flip angle method for longitudinal relaxation time T(1) quantification from spoiled steady state MRI is derived from the half angle tangent transform, tau, of the flip angle. Plotting the signal S at coordinates x = S tau and y = S/tau, respectively, establishes a line that renders signal amplitude and relaxation term separately as y-intercept and slope. This representation allows for estimation of the respective parameter from the experimental data. A comprehensive analysis of noise propagation is performed. Numerical results for efficient optimization of longitudinal relaxation time and proton density mapping experiments are derived. Appropriate scaling allows for a linear presentation of data that are acquired at different short pulse repetition times, TR << T1 thus increasing flexibility in the data acquisition by removing the limitation of a single pulse repetition time. Signal bias, like due to slice-selective excitation or imperfect spoiling, can be readily identified by systematic deviations from the linear plot. The method is illustrated and validated by 3T experiments on phantoms and human brain. Magn Reson Med 66:669-677, 2011. (C)2011 Wiley-Liss, Inc."],["dc.description.sponsorship","Wellcome Trust"],["dc.identifier.doi","10.1002/mrm.22849"],["dc.identifier.isi","000293988000007"],["dc.identifier.pmid","21432900"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/22283"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Wiley-blackwell"],["dc.relation.issn","0740-3194"],["dc.title","Identification of Signal Bias in the Variable Flip Angle Method by Linear Display of the Algebraic Ernst Equation"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","12.e1"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","American Journal of Orthodontics and Dentofacial Orthopedics"],["dc.bibliographiccitation.volume","136"],["dc.contributor.author","Hahn, Wolfram"],["dc.contributor.author","Dathe, Henning"],["dc.contributor.author","Fialka-Fricke, Julia"],["dc.contributor.author","Fricke-Zech, Susanne"],["dc.contributor.author","Zapf, Antonia"],["dc.contributor.author","Kubein-Meesenburg, Dietmar"],["dc.contributor.author","Sadat-Khonsari, Reza"],["dc.date.accessioned","2018-11-07T08:27:52Z"],["dc.date.available","2018-11-07T08:27:52Z"],["dc.date.issued","2009"],["dc.description.abstract","Introduction: The aim of the study was to quantify the forces delivered by thermoplastic appliances made of 2 materials with 2 thicknesses to a maxillary central incisor during tipping. Methods: Two materials were tested, each in 2 thicknesses: Erkodur (Erkodent Erich Kopp GmbH, Pfalzgrafenweiler, Germany) 1.0 and 0.8 mm, and Biolon (Dreve Dentamid GmbH, Unna, Germany), 1.0 and 0.75 mm. For each material, 5 appliances were produced. To measure the forces applied, an isolated measuring tooth, part of a standardized resin model, was deflected in 0.05 degrees steps from 0 degrees to 0.42 degrees in the vestibular and palatine directions, after placing the respective appliance on the model. For statistical analysis, the force components Fx/tipping and Fz/intrusion at a displacement of +/- 0.151 mm from the incisor edge were selected. Means and standard deviations were calculated. The Wilcoxon 2-sample test for group pairings was used. Results: The norms for the mean Fx forces ranged from 1.62 (SD, 0.41) to 5.35 N (SD, 0.63). The mean Fz forces were between 0.07 (SD, 0.13) and -2.47 N (SD, 0.34). The highest intrusive forces were measured during vestibular displacement of the measuring tooth. The forces delivered by the thick appliances were overall significantly higher (P < 0.0001) than those of the thin materials. The forces delivered by the Biolon appliances were generally significantly higher (P < 0.0001) than those for the Erkodur materials. Conclusions: The forces applied were mostly too high when compared with those stated in the literature as ideal. In addition to thickness, the thermoforming process influences the magnitude of the force delivered by a thermoformed appliance. (Am J Orthod Dentofacial Orthop 2009; 136: 12.e1-12.e7)"],["dc.identifier.doi","10.1016/j.ajodo.2008.12.015"],["dc.identifier.isi","000267695500009"],["dc.identifier.pmid","19577136"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/16295"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Mosby-elsevier"],["dc.relation.issn","0889-5406"],["dc.title","Influence of thermoplastic appliance thickness on the magnitude of force delivered to a maxillary central incisor during tipping"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","176"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Der Unfallchirurg"],["dc.bibliographiccitation.lastpage","184"],["dc.bibliographiccitation.volume","112"],["dc.contributor.author","Frosch, Karl-Heinz"],["dc.contributor.author","Naegerl, H."],["dc.contributor.author","Kubein-Meesenburg, Dietmar"],["dc.contributor.author","Doerner, Jochen"],["dc.contributor.author","Dathe, H."],["dc.contributor.author","Hellerer, O."],["dc.contributor.author","Dumont, C."],["dc.contributor.author","Stuermer, Klaus-Michael"],["dc.date.accessioned","2018-11-07T08:33:22Z"],["dc.date.available","2018-11-07T08:33:22Z"],["dc.date.issued","2009"],["dc.description.abstract","The human medial tibial plateau is concave, whereas the lateral tibial plateau is convex. In a normal knee, the convex femoral condyles roll and glide on the tibia during the standing phase of walking. The designs of most commercially available knee prostheses do not take this morphological feature into consideration. The novel design of the AEQUOS G1 knee replacement prosthesis is based on the natural anatomy of the knee joint, with a convex lateral tibia plateau and a sagittal offset of the medial and lateral compartments. Following extensive development and testing, initial clinical results of the AEQUOS G1 prosthesis in a mulitcenter study are presented. From Mai 2005 to March 2007, 158 patients in 4 clinics underwent total knee arthroplasty with the AEQUOS G1 and agreed to participate in the study. Patients were evaluated preoperatively and at 3, 6 and 12 months of follow-up using a standardized protocol that included the American Knee Society Score (AKSS), the Oxford Knee Score (OKS) and the Visual Analog Scale (VAS) for pain. After 3 months, 151 patients appeared for follow up appointments, after 6 months, 134, and after 12 months, 127. The mean range of motion preoperatively was 97.0A degrees (+/- 19.9A degrees) and 107.5A degrees (+/- 15.9A degrees) 12 months after surgery. The AKSS, as well as the modified OKS, significantly improved (p < 0.0001) from preoperative scores of 98.8 (+/- 35.8) and 37.3 (+/- 6.9) points, respectively, to 165.8 (+/- 34.1) and 21.9 (+/- 7.8) points, preoperatively, and 12 months postoperatively. The VAS score significantly decreased (p < 0.001) from 7.4 (+/- 1.8) points preoperatively to 1.9 (+/- 2.2) points 12 months postoperatively. One implant was revised because of arthrofibrosis and another due to patellar luxation. Two patients required revision because their implants revealed malalignement with ligamentous instability. No infections, aseptic loosening or other implant-specific complications were observed at this early follow-up. Good clinical results were observed at early follow-up with the AEQUOS G1 knee arthroplasty. However, longer follow-up is necessary for a general evaluation of the implant."],["dc.identifier.doi","10.1007/s00113-008-1551-4"],["dc.identifier.isi","000263300400006"],["dc.identifier.pmid","19212737"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/17560"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","0177-5537"],["dc.title","A new total knee arthroplasty with physiologically shaped surfaces Part 2: First clinical results"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","103"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","ACTA OF BIOENGINEERING AND BIOMECHANICS"],["dc.bibliographiccitation.lastpage","110"],["dc.bibliographiccitation.volume","18"],["dc.contributor.author","Dathe, Henning"],["dc.contributor.author","Dumont, Clemens"],["dc.contributor.author","Perplies, Rainer"],["dc.contributor.author","Fanghaenel, Jochen"],["dc.contributor.author","Kubein-Meesenburg, Dietmar"],["dc.contributor.author","Naegerl, Hans"],["dc.contributor.author","Wachowski, Martin Michael"],["dc.date.accessioned","2018-11-07T10:20:13Z"],["dc.date.available","2018-11-07T10:20:13Z"],["dc.date.issued","2016"],["dc.description.abstract","Purpose: The purpose is to present a mathematical model of the function of the thumb carpometacarpal joint (TCMCJ) based on measurements of human joints. In the TCMCJ both articulating surfaces are saddle-shaped. The aim was to geometrically survey the shapes of the articulating surfaces using precise replicas of 28 TCMCJs. Methods: None of these 56 articulating surfaces did mathematically extend the differential geometrical neighbourhood around the main saddle point so that each surface could be characterised by three main parameters: the two extreme radii of curvature in the main saddle point and the angle between the saddles' asymptotics (straight lines). Results: The articulating surfaces, when contacting at the respective main saddle points, are incongruent. Hence, the TCMCJ has functionally five kinematical degrees of freedom (DOF); two DOF belong to flexion/extension, two to ab-/adduction. These four DOF are controlled by the muscular apparatus. The fifth DOF, axial rotation, cannot be adjusted but stabilized by the muscular apparatus so that physiologically under compressive load axial rotation does not exceed an angle of approximately +/- 3 degrees. Conclusions: The TCMCJ can be stimulated by the muscular apparatus to circumduct. The mechanisms are traced back to the curvature incongruity of the saddle surfaces. Hence we mathematically proved that none of the individual saddle surfaces can be described by a quadratic saddle surface as is often assumed in literature. We derived an algebraic formula with which the articulating surfaces in the TCMCJ can be quantitatively described. This formula can be used to shape the articulating surfaces in physiologically equivalent TCMCJ-prostheses."],["dc.identifier.doi","10.5277/ABB-00386-2015-02"],["dc.identifier.isi","000379915800011"],["dc.identifier.pmid","27405537"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/41834"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Wroclaw Univ Technology"],["dc.relation.issn","1509-409X"],["dc.title","The thumb carpometacarpal joint: curvature morphology of the articulating surfaces, mathematical description and mechanical functioning"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","667"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","Magnetic Resonance in Medicine"],["dc.bibliographiccitation.lastpage","672"],["dc.bibliographiccitation.volume","59"],["dc.contributor.author","Helms, Gunther"],["dc.contributor.author","Dathe, Henning"],["dc.contributor.author","Dechent, Peter"],["dc.date.accessioned","2018-11-07T11:17:51Z"],["dc.date.available","2018-11-07T11:17:51Z"],["dc.date.issued","2008"],["dc.description.abstract","From the half-angle substitution of trigonometric terms in the Ernst equation, rational approximations of the flip angle dependence of the FLASH signal can be derived. Even the rational function of the lowest order was in good agreement with the experiment for flip angles up to 20 degrees. Three-dimensional maps of the signal amplitude and longitudinal relaxation rates in human brain were obtained from eight subjects by dual-angle measurements at 3T (nonselective 3D-FLASH, 7 degrees and 20 degrees flip angle, TR = 30 ms, isotropic resolution of 0.95 mm, each 7:09 min). The corresponding estimates of T, and signal amplitude are simple algebraic expressions and deviated about 1% from the exact solution. They are ill-conditioned to estimate the local flip angle deviation but can be corrected post hoc by division of squared RF maps obtained by independent measurements. Local deviations from the nominal flip angles strongly affected the relaxation estimates and caused considerable blurring of the T-1 histograms."],["dc.identifier.doi","10.1002/mrm.21542"],["dc.identifier.isi","000253881200030"],["dc.identifier.pmid","18306368"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/54910"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","John Wiley & Sons Inc"],["dc.relation.issn","0740-3194"],["dc.title","Quantitative FLASH MRI at 3T using a rational approximation of the Ernst equation"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","177"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Magnetic Resonance in Medicine"],["dc.bibliographiccitation.lastpage","185"],["dc.bibliographiccitation.volume","64"],["dc.contributor.author","Helms, Gunther"],["dc.contributor.author","Dathe, Henning"],["dc.contributor.author","Dechent, Peter"],["dc.date.accessioned","2018-11-07T08:41:53Z"],["dc.date.available","2018-11-07T08:41:53Z"],["dc.date.issued","2010"],["dc.description.abstract","Attempts to optimize the magnetization transfer ratio (MTR) obtained from spoiled gradient echo MRI have focused on the properties of the magnetization transfer pulse. In particular, continuous-wave models do not explicitly account for the effects of excitation and relaxation on the MTR. In this work, these were modeled by an approximation of free relaxation between the radiofrequency pulses and of an instantaneous saturation event describing the magnetization transfer pulse. An algebraic approximation of the signal equation can be obtained for short pulse repetition time and small flip angles. This greatly facilitated the mathematical treatment and understanding of the MTR. The influence of inhomogeneous radiofrequency fields could be readily incorporated. The model was verified on the human brain in vivo at 3 T by variation of flip angle and pulse repetition time. The corresponding range in MTR was similar to that observed by a 4-fold increase of magnetization transfer pulse power. Choice of short pulse repetition time and larger flip angles improved the MTR contrast and reduced the influence of radiofrequency inhornogeneity. Optimal contrast is obtained around an MTR of 50%, and noise progression is reduced when a high reference signal is obtained. Magn Reson Med 64:177-185, 2010. (C) 2010 Wiley-Liss, Inc."],["dc.description.sponsorship","Volkswagen Foundation"],["dc.identifier.doi","10.1002/mrm.22379"],["dc.identifier.isi","000279301500021"],["dc.identifier.pmid","20572139"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/19568"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","John Wiley & Sons Inc"],["dc.relation.issn","0740-3194"],["dc.title","Modeling the Influence of TR and Excitation Flip Angle on the Magnetization Transfer Ratio (MTR) in Human Brain Obtained From 3D Spoiled Gradient Echo MRI"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1057"],["dc.bibliographiccitation.issue","6"],["dc.bibliographiccitation.journal","The Angle Orthodontist"],["dc.bibliographiccitation.lastpage","1063"],["dc.bibliographiccitation.volume","81"],["dc.contributor.author","Hahn, Wolfram"],["dc.contributor.author","Engelke, Benjamin"],["dc.contributor.author","Jung, Klaus"],["dc.contributor.author","Dathe, Henning"],["dc.contributor.author","Kramer, Franz-Joseph"],["dc.contributor.author","Roedig, Tina"],["dc.contributor.author","Kubein-Meesenburg, Dietmar"],["dc.contributor.author","Gruber, Rudolf Matthias"],["dc.date.accessioned","2018-11-07T08:50:19Z"],["dc.date.available","2018-11-07T08:50:19Z"],["dc.date.issued","2011"],["dc.description.abstract","Objective: To determine the forces and moments delivered to a maxillary central incisor during rotation with aligners when a simulated occlusal force generated during swallowing acts on the appliance. Materials and Methods: Five identical appliances were manufactured from four different starting materials (Erkodur 0.8 mm and 1.0 mm; Biolon 0.75 mm and 1.0 mm). An upper central incisor fixed in a measuring device was rotated around its central axis in 0.5-degree steps up to +/- 10 degrees with the appliance fixed in place. An occlusal force of 30 N generated during swallowing was simulated with a weight positioned on the appliance. For statistical analysis, the moments Tz (rotation) and forces Fz (intrusion) at a deflection of +/- 0.34 mm to the incisor edge (+/- 5 degrees rotation) were tested. Means and standard deviations for Tz and median and 25% and 75% quartiles for Fz were calculated. An analysis of variance was performed. Results: The simulated occlusal force increased the measured intrusive force Fz (maximum with a weight, -3.7 N [-3.7, -2.4]; minimum without a weight, -1.3 N [-1.4, -1.1]) and the rotary moment Tz (maximum with a weight, -50.8 Nmm [+/- 0.8]; minimum without a weight, 18.2 Nmm [+/- 0.9]) significantly in all cases (P < .01). This was found for all materials measured and for both directions of rotation. Conclusion: During rotation with aligners, a simulated occlusal force increases the intrusive force and the rotary moment. The biological adverse side effects of these phenomena remain unclear, especially in patients with periods of bruxism. (Angle Orthod. 2011;81:1057-1063.)"],["dc.identifier.doi","10.2319/013111-62.1"],["dc.identifier.isi","000296484900019"],["dc.identifier.pmid","21612314"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/8018"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/21669"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","E H Angle Education Research Foundation, Inc"],["dc.relation.issn","0003-3219"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.title","The influence of occlusal forces on force delivery properties of aligners during rotation of an upper central incisor"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","339"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","Annals of Anatomy - Anatomischer Anzeiger"],["dc.bibliographiccitation.lastpage","341"],["dc.bibliographiccitation.volume","189"],["dc.contributor.author","Ihlow, Dankmar"],["dc.contributor.author","Kubein-Meesenburg, Dietmar"],["dc.contributor.author","Fanghaenel, Jochen"],["dc.contributor.author","Thieme, Kirsten M."],["dc.contributor.author","Hahn, Wolfram"],["dc.contributor.author","Dathe, Henning"],["dc.contributor.author","Zech, Susanne"],["dc.contributor.author","Naegerl, Hans"],["dc.date.accessioned","2018-11-07T11:05:56Z"],["dc.date.available","2018-11-07T11:05:56Z"],["dc.date.issued","2007"],["dc.description.abstract","Examinations of the curvature morphology of the temporomandibular joints (TMJs) in macerated human skulls yielded that in initial protrusive cranial border motion, parts of the condylar articulating surfaces are only functional under force transmission. These areas were found on the lateral-central side of the condyle. In contrast to the Cercopithecus mona, a monkey species, the human TMJ apparently possesses a distinctly higher spatial performance range. (C) 2007 Elsevier GmbH. All rights reserved."],["dc.identifier.doi","10.1016/j.aanat.2007.02.007"],["dc.identifier.isi","000248006000007"],["dc.identifier.pmid","17695988"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/52183"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Gmbh, Urban & Fischer Verlag"],["dc.publisher.place","Jena"],["dc.relation.conference","102nd Annual Meeting of the Anatomische-Gesellschaft"],["dc.relation.eventlocation","Giessen, GERMANY"],["dc.relation.issn","0940-9602"],["dc.title","Aspects of morphotogy and guidance of the human temporomandibular joint"],["dc.type","conference_paper"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","4231"],["dc.bibliographiccitation.issue","15"],["dc.bibliographiccitation.journal","Physics in Medicine and Biology"],["dc.bibliographiccitation.lastpage","4245"],["dc.bibliographiccitation.volume","55"],["dc.contributor.author","Dathe, Henning"],["dc.contributor.author","Helms, Gunther"],["dc.date.accessioned","2018-11-07T08:40:27Z"],["dc.date.available","2018-11-07T08:40:27Z"],["dc.date.issued","2010"],["dc.description.abstract","The Ernst equation for Fourier transform nuclear magnetic resonance (MR) describes the spoiled steady-state signal created by periodic partial excitation. In MR imaging (MRI), it is commonly applied to spoiled gradient-echo acquisition in the steady state, created by a small flip angle alpha at a repetition time TR much shorter than the longitudinal relaxation time T(1). We describe two parameter transformations of alpha and TR/T(1), which render the Ernst equation as a low-order rational function. Computer algebra can be readily applied for analytically solving protocol optimization, as shown for the dual flip angle experiment. These transformations are based on the half-angle tangent substitution and its hyperbolic analogue. They are monotonic and approach identity for small alpha and small TR/T(1) with a third-order error. Thus, the exact algebraization can be readily applied to fast gradient echo MRI to yield a rational approximation in alpha and TR/T(1). This reveals a fundamental relationship between the square of the flip angle and TR/T(1) which characterizes the Ernst angle, constant degree of T(1)-weighting and the influence of the local radio-frequency field."],["dc.identifier.doi","10.1088/0031-9155/55/15/003"],["dc.identifier.isi","000280115200003"],["dc.identifier.pmid","20616401"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/6123"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/19232"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Iop Publishing Ltd"],["dc.relation.issn","0031-9155"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.title","Exact algebraization of the signal equation of spoiled gradient echo MRI"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]