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  • 1
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    Evaluation of 3D MRI for early detection of bone edema associated with apical periodontitis
    Springer Science and Business Media LLC ; 2023
    In:  Clinical Oral Investigations Vol. 27, No. 9 ( 2023-07-18), p. 5403-5412
    Details
    In: Clinical Oral Investigations, Springer Science and Business Media LLC, Vol. 27, No. 9 ( 2023-07-18), p. 5403-5412
    Abstract: To detect and evaluate early signs of apical periodontitis using MRI based on a 3D short-tau-inversion-recovery (STIR) sequence compared to conventional panoramic radiography (OPT) and periapical radiographs in patients with apical periodontitis. Materials and methods Patients with clinical evidence of periodontal disease were enrolled prospectively and received OPT as well as MRI of the viscerocranium including a 3D-STIR sequence. The MRI sequences were assessed for the occurrence and extent of bone changes associated with apical periodontitis including bone edema, periradicular cysts, and dental granulomas. OPTs and intraoral periapical radiographs, if available, were assessed for corresponding periapical radiolucencies using the periapical index (PAI). Results In total, 232 teeth of 37 patients (mean age 62±13.9 years, 18 women) were assessed. In 69 cases reactive bone edema was detected on MRI with corresponding radiolucency according to OPT. In 105 cases edema was detected without corresponding radiolucency on OPT. The overall extent of edema measured on MRI was significantly larger compared to the radiolucency on OPT (mean: STIR 2.4±1.4 mm, dental radiograph 1.3±1.2 mm, OPT 0.8±1.1 mm, P =0.01). The overall PAI score was significantly higher on MRI compared to OPT (mean PAI: STIR 1.9±0.7, dental radiograph 1.3±0.5, OPT 1.2±0.7, P =0.02). Conclusion Early detection and assessment of bone changes of apical periodontitis using MRI was feasible while the extent of bone edema measured on MRI exceeded the radiolucencies measured on OPT. Clinical relevance In clinical routine, dental MRI might be useful for early detection and assessment of apical periodontitis before irreversible bone loss is detected on conventional panoramic and intraoral periapical radiographs.
    Type of Medium: Online Resource
    ISSN: 1436-3771
    URL: Article
    DOI: 10.1007/s00784-023-05159-z
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2023
    detail.hit.zdb_id: 1472578-2
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  • 2
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    Visualization of clinically silent, odontogenic maxillary sinus mucositis originating from periapical inflammation using MRI: a feasibility study
    Springer Science and Business Media LLC ; 2023
    In:  Clinical Oral Investigations Vol. 27, No. 7 ( 2023-04-11), p. 3705-3712
    Details
    In: Clinical Oral Investigations, Springer Science and Business Media LLC, Vol. 27, No. 7 ( 2023-04-11), p. 3705-3712
    Abstract: Maxillary sinus mucositis is frequently associated with odontogenic foci. Periapical inflammation of maxillary molars and premolars cannot be visualized directly using radiation-based imaging. The purpose of this study was to answer the following clinical question: among patients with periapical inflammatory processes in the maxilla, does the use of magnetic resonance imaging (MRI), as compared to conventional periapical (AP) and panoramic radiography (OPT), improve diagnostic accuracy? Methods Forty-two subjects with generalized periodontitis were scanned on a 3 T MRI. Sixteen asymptomatic subjects with mucosal swelling of the maxillary sinus were enrolled in the study. Periapical edema was assessed using short tau inversion recovery (STIR) sequence. Apical osteolysis and mucosal swelling were assessed by MRI, AP, and OPT imaging using the periapical index score (PAI). Comparisons between groups were performed with chi-squared tests with Yates’ correction. Significance was set at p   〈  0.05. Results Periapical lesions of maxillary premolars and molars were identified in 16 subjects, 21 sinuses, and 58 teeth. Bone edema and PAI scores were significantly higher using MRI as compared to OPT and AP ( p   〈  0.05). Using the STIR sequence, a significant association of PAI score  〉  1 and the presence of mucosal swelling in the maxillary sinus was detected ( p  = 0.03). Conclusion Periapical inflammation and maxillary mucositis could be visualized using STIR imaging. The use of MRI may help detect early, subtle inflammatory changes in the periapical tissues surrounding maxillary dentition. Early detection could guide diagnostic criteria, as well as treatment and prevention.
    Type of Medium: Online Resource
    ISSN: 1436-3771
    URL: Article
    DOI: 10.1007/s00784-023-04986-4
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2023
    detail.hit.zdb_id: 1472578-2
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  • 3
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    Magnetic resonance imaging as a diagnostic tool for periodontal disease: A prospective study with correlation to standard clinical findings—Is there added value?
    Wiley ; 2021
    In:  Journal of Clinical Periodontology Vol. 48, No. 7 ( 2021-07), p. 929-948
    Details
    In: Journal of Clinical Periodontology, Wiley, Vol. 48, No. 7 ( 2021-07), p. 929-948
    Abstract: To evaluate the correlation between standard clinical findings, radiographic (OPT) and magnetic resonance imaging (MRI) as well as to assess whether MRI is capable of providing additional information related to the severity and extent of periodontal disease. Methods 42 patients with generalized periodontitis received pre‐interventional MRI scans. These were compared to MR images of a periodontal healthy control group ( n  = 34). The extent of the osseous oedema, detected by MRI, was set in correlation with clinical periodontitis‐associated findings. Results A highly significant correlation between bone oedema and clinical testings such as probing depth ( p   〈  0.0001) and bleeding on probing ( p   〈  0.0001) was revealed. The oedema exceeded the extent of demineralized bone. Patients with a positive BOP test showed a 2.51‐fold increase in risk of already having a bone oedema around the respective tooth even if probing depth was ≤3 mm (logistic binary regression analysis, OR 2.51; 95% CI: 1.54–4.11; p   〈  0.0001). Conclusion MRI findings correlated with standard clinical findings, and MRI was able to depict intraosseous changes before any osseous defect had occurred.
    Type of Medium: Online Resource
    ISSN: 0303-6979 , 1600-051X
    URL: Issue
    URL: Article
    DOI: 10.1111/jcpe.v48.7
    DOI: 10.1111/jcpe.13458
    Language: English
    Publisher: Wiley
    Publication Date: 2021
    detail.hit.zdb_id: 2026349-1
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  • 4
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    Comparison of CT, MRI, and F-18 FDG PET/CT for initial N-staging of oral squamous cell carcinoma: a cost-effectiveness analysis
    Springer Science and Business Media LLC ; 2022
    In:  European Journal of Nuclear Medicine and Molecular Imaging Vol. 49, No. 11 ( 2022-09), p. 3870-3877
    Details
    In: European Journal of Nuclear Medicine and Molecular Imaging, Springer Science and Business Media LLC, Vol. 49, No. 11 ( 2022-09), p. 3870-3877
    Abstract: Treatment of oral squamous cell carcinoma (OSCC) is based on clinical exam, biopsy, and a precise imaging-based TNM-evaluation. A high sensitivity and specificity for magnetic resonance imaging (MRI) and F-18 FDG PET/CT are reported for N-staging. Nevertheless, staging of oral squamous cell carcinoma is most often based on computed tomography (CT) scans. This study aims to evaluate cost-effectiveness of MRI and PET/CT compared to standard of care imaging in initial staging of OSCC within the US Healthcare System. Methods A decision model was constructed using quality-adjusted life years (QALYs) and overall costs of different imaging strategies including a CT of the head, neck, and the thorax, MRI of the neck with CT of the thorax, and whole body F-18 FDG PET/CT using Markov transition simulations for different disease states. Input parameters were derived from literature and willingness to pay (WTP) was set to US $100,000/QALY. Deterministic sensitivity analysis of diagnostic parameters and costs was performed. Monte Carlo modeling was used for probabilistic sensitivity analysis. Results In the base-case scenario, total costs were at US $239,628 for CT, US $240,001 for MRI, and US $239,131 for F-18 FDG PET/CT whereas the model yielded an effectiveness of 5.29 QALYs for CT, 5.30 QALYs for MRI, and 5.32 QALYs for F-18 FDG PET/CT respectively. F-18 FDG PET/CT was the most cost-effective strategy over MRI as well as CT, and MRI was the cost-effective strategy over CT. Deterministic and probabilistic sensitivity analysis showed high robustness of the model with incremental cost effectiveness ratio remaining below US $100,000/QALY for a wide range of variability of input parameters. Conclusion F-18 FDG PET/CT is the most cost-effective strategy in the initial N-staging of OSCC when compared to MRI and CT. Despite less routine use, both whole body PET/CT and MRI are cost-effective modalities in the N-staging of OSCC. Based on these findings, the implementation of PET/CT for initial staging could be suggested to help reduce costs while increasing effectiveness in OSCC.
    Type of Medium: Online Resource
    ISSN: 1619-7070 , 1619-7089
    URL: Article
    DOI: 10.1007/s00259-022-05843-4
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2022
    detail.hit.zdb_id: 2098375-X
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  • 5
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    Magnetic resonance imaging based computer‐guided dental implant surgery—A clinical pilot study
    Wiley ; 2020
    In:  Clinical Implant Dentistry and Related Research Vol. 22, No. 5 ( 2020-10), p. 612-621
    Details
    In: Clinical Implant Dentistry and Related Research, Wiley, Vol. 22, No. 5 ( 2020-10), p. 612-621
    Abstract: Computer‐guided implant surgery is currently based on radiographic techniques exposing patients to ionizing radiation. Purpose To assess, whether computer‐assisted 3D implant planning with template‐guided placement of dental implants based on magnetic resonance imaging (MRI) is feasible. Materials and methods 3‐Tesla MRI was performed in 12 subjects as a basis for prosthetically driven virtual planning and subsequent guided implant surgery. To evaluate the transferability of the virtually planned implant position, deviations between virtually planned and resulting implant position were studied. Matching of occlusal surfaces was assessed by comparing surface scans with MRI‐derived images. In addition, the overall image quality and the ability of depicting anatomically important structures were rated. Results MRI‐based guided implant surgery with subsequent prosthetic treatment was successfully performed in nine patients. Mean deviations between virtually planned and resulting implant position (error at entry point 0.8 ± 0.3 mm, error at apex 1.2 ± 0.6 mm, angular deviation 4.9 ± 3.6°), mean deviation of occlusal surfaces between surface scans and MRI‐based tooth reconstructions (mean 0.254 ± 0.026 mm) as well as visualization of important anatomical structures were acceptable for clinical application. Conclusion Magnetic resonance imaging (MRI) based computer‐assisted implant surgery is a feasible and accurate procedure that avoids exposure to ionizing radiation.
    Type of Medium: Online Resource
    ISSN: 1523-0899 , 1708-8208
    URL: Issue
    URL: Article
    DOI: 10.1111/cid.2020.v22.5
    DOI: 10.1111/cid.12939
    Language: English
    Publisher: Wiley
    Publication Date: 2020
    detail.hit.zdb_id: 2094120-1
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  • 6
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    Association of quadriceps muscle, gluteal muscle, and femoral bone marrow composition using chemical shift encoding-based water-fat MRI: a preliminary study in healthy young volunteers
    Springer Science and Business Media LLC ; 2020
    In:  European Radiology Experimental Vol. 4, No. 1 ( 2020-12)
    Details
    In: European Radiology Experimental, Springer Science and Business Media LLC, Vol. 4, No. 1 ( 2020-12)
    Abstract: We investigated the composition of the gluteal (gluteus maximus, medius, and minimus) and quadriceps (rectus femoris, vastus lateralis, medialis, and intermedius) muscle groups and its associations with femoral bone marrow using chemical shift encoding-based water-fat magnetic resonance imaging (CSE-MRI) to improve our understanding of muscle-bone interaction. Methods Thirty healthy volunteers (15 males, aged 30.5 ± 4.9 years [mean ± standard deviation]; 15 females, aged 29.9 ± 7.1 years) were recruited. A six-echo three-dimensional spoiled gradient-echo sequence was used for 3-T CSE-MRI at the thigh and hip region. The proton density fat fraction (PDFF) of the gluteal and quadriceps muscle groups as well as of the femoral head, neck, and greater trochanter bone marrow were extracted and averaged over both sides. Results PDFF values of all analysed bone marrow compartments were significantly higher in men than in women ( p ≤ 0.047). PDFF values of the analysed muscles showed no significant difference between men and women ( p ≥ 0.707). After adjusting for age and body mass index, moderate significant correlations of PDFF values were observed between the gluteal and quadriceps muscle groups ( r = 0.670) and between femoral subregions (from r = 0.613 to r = 0.655). Regarding muscle-bone interactions, only the PDFF of the quadriceps muscle and greater trochanter bone marrow showed a significant correlation ( r = 0.375). Conclusions The composition of the muscle and bone marrow compartments at the thigh and hip region in young, healthy subjects seems to be quite distinct, without evidence for a strong muscle-bone interaction.
    Type of Medium: Online Resource
    ISSN: 2509-9280
    URL: Article
    DOI: 10.1186/s41747-020-00162-5
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2020
    detail.hit.zdb_id: 2905812-0
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  • 7
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    Malignant Peripheral Nerve Sheath Tumor in the Course of the Mandibular Nerve
    Elsevier BV ; 2018
    In:  World Neurosurgery Vol. 117 ( 2018-09), p. e130-e137
    Details
    In: World Neurosurgery, Elsevier BV, Vol. 117 ( 2018-09), p. e130-e137
    Type of Medium: Online Resource
    ISSN: 1878-8750
    URL: Article
    DOI: 10.1016/j.wneu.2018.05.203
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2018
    detail.hit.zdb_id: 2530041-6
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  • 8
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    Gender- and Age-Related Changes in Trunk Muscle Composition Using Chemical Shift Encoding-Based Water–Fat MRI
    MDPI AG ; 2018
    In:  Nutrients Vol. 10, No. 12 ( 2018-12-13), p. 1972-
    Details
    In: Nutrients, MDPI AG, Vol. 10, No. 12 ( 2018-12-13), p. 1972-
    Abstract: Ageing, sarcopenia, and malnutrition are associated with quantitative and qualitative changes of body composition. There are several imaging modalities, including magnetic resonance imaging (MRI), for the assessment of trunk muscle tissue composition. In this study, we investigated the gender- and age-related changes in trunk muscle composition using chemical shift encoding-based water–fat MRI. A total of 79 healthy volunteers (26 men: 38.9 ± 10.4 years; 53 women: 39.5 ± 15.0 years) underwent 3T axial MRI using a six-echo multi-echo 3D spoiled gradient echo sequence, allowing for the calculation of the proton density fat fraction (PDFF) in the trunk muscles. PDFF of the abdominal, psoas, and erector spinae muscles were determined. We detected significant positive correlations for abdominal muscle PDFF with age (r = 0.638, p = 0.0001) in men, and for abdominal muscle PDFF (r = 0.709, p = 0.0001) and erector spinae muscle PDFF (r = 0.674, p = 0.0001) with age in women. After adjustment for body mass index (BMI), only the correlation of age and abdominal muscle PDFF in women remained significant (r = 0.631, p = 0.0001). The findings of this study suggest that an increasing fat deposition in muscle is driven primarily by age, rather than BMI, in women. These results further support that PDFF can be considered a valid imaging biomarker of trunk muscle composition.
    Type of Medium: Online Resource
    ISSN: 2072-6643
    URL: Article
    DOI: 10.3390/nu10121972
    Language: English
    Publisher: MDPI AG
    Publication Date: 2018
    detail.hit.zdb_id: 2518386-2
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  • 9
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    Initial Raymond–Roy Occlusion Classification but not Packing Density Defines Risk for Recurrence after Aneurysm Coiling
    Springer Science and Business Media LLC ; 2021
    In:  Clinical Neuroradiology Vol. 31, No. 2 ( 2021-06), p. 391-399
    Details
    In: Clinical Neuroradiology, Springer Science and Business Media LLC, Vol. 31, No. 2 ( 2021-06), p. 391-399
    Abstract: After coil embolization of intracranial aneurysms, it is currently not well understood whether the initial coil packing density or the type of aneurysm residual perfusion, depicted by the modified Raymond-Roy occlusion classification, primarily effects the rate of aneurysm recurrence. We hypothesized that these factors interact and only one remains an independent risk factor. Methods In this single center retrospective study, 440 patients with intracranial ruptured and unruptured aneurysms between 2010 and 2017 were screened. A total of 267 patients treated with stand-alone coiling, with or without stent or balloon assistance were included (age 54.1 ± 12.2 years, sex 70.4% female). Flow diverter or Woven EndoBridge (WEB) device implantation were exclusion criteria. Results Using a binary logistic regression model, independent risk factors for aneurysm recurrence were postinterventional modified Raymond-Roy occlusion classification class (Odds ratio [OR] 1.747, 95% confidence interval [CI] 1.231–2.480) and aneurysm diameter (OR 1.145, CI 1.032–1.271). A trend towards a higher recurrence in ruptured aneurysms did not reach significance (OR 1.656, CI 0.863–3.179). Aneurysm localization, packing density, and neck width were not independently associated with aneurysm recurrence. Conclusion Independent risk factors for aneurysm recurrence after coil embolization with and without stent or balloon assistance were aneurysm diameter and postinterventional grading within the modified Raymond-Roy occlusion classification. Packing density interacted with the latter and was not independently associated to recurrence.
    Type of Medium: Online Resource
    ISSN: 1869-1439 , 1869-1447
    URL: Article
    DOI: 10.1007/s00062-020-00926-x
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2021
    detail.hit.zdb_id: 2232347-8
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  • 10
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    Texture Analysis Using CT and Chemical Shift Encoding-Based Water-Fat MRI Can Improve Differentiation Between Patients With and Without Osteoporotic Vertebral Fractures
    Frontiers Media SA ; 2022
    In:  Frontiers in Endocrinology Vol. 12 ( 2022-1-4)
    Details
    In: Frontiers in Endocrinology, Frontiers Media SA, Vol. 12 ( 2022-1-4)
    Abstract: Osteoporosis is a highly prevalent skeletal disease that frequently entails vertebral fractures. Areal bone mineral density (BMD) derived from dual-energy X-ray absorptiometry (DXA) is the reference standard, but has well-known limitations. Texture analysis can provide surrogate markers of tissue microstructure based on computed tomography (CT) or magnetic resonance imaging (MRI) data of the spine, thus potentially improving fracture risk estimation beyond areal BMD. However, it is largely unknown whether MRI-derived texture analysis can predict volumetric BMD (vBMD), or whether a model incorporating texture analysis based on CT and MRI may be capable of differentiating between patients with and without osteoporotic vertebral fractures. Materials and Methods Twenty-six patients (15 females, median age: 73 years, 11 patients showing at least one osteoporotic vertebral fracture) who had CT and 3-Tesla chemical shift encoding-based water-fat MRI (CSE-MRI) available were analyzed. In total, 171 vertebral bodies of the thoracolumbar spine were segmented using an automatic convolutional neural network (CNN)-based framework, followed by extraction of integral and trabecular vBMD using CT data. For CSE-MRI, manual segmentation of vertebral bodies and consecutive extraction of the mean proton density fat fraction (PDFF) and T2* was performed. First-order, second-order, and higher-order texture features were derived from texture analysis using CT and CSE-MRI data. Stepwise multivariate linear regression models were computed using integral vBMD and fracture status as dependent variables. Results Patients with osteoporotic vertebral fractures showed significantly lower integral and trabecular vBMD when compared to patients without fractures (p & lt;0.001). For the model with integral vBMD as the dependent variable, T2* combined with three PDFF-based texture features explained 40% of the variance (adjusted R 2 [ R a 2 ] = 0.40; p & lt;0.001). Furthermore, regarding the differentiation between patients with and without osteoporotic vertebral fractures, a model including texture features from CT and CSE-MRI data showed better performance than a model based on integral vBMD and PDFF only ( R a 2 = 0.47 vs. R a 2  = 0.81; included texture features in the final model: integral vBMD, CT_Short-run_emphasis, CT_Varianceglobal, and PDFF_Variance). Conclusion Using texture analysis for spine CT and CSE-MRI can facilitate the differentiation between patients with and without osteoporotic vertebral fractures, implicating that future fracture prediction in osteoporosis may be improved.
    Type of Medium: Online Resource
    ISSN: 1664-2392
    URL: Article
    DOI: 10.3389/fendo.2021.778537
    Language: Unknown
    Publisher: Frontiers Media SA
    Publication Date: 2022
    detail.hit.zdb_id: 2592084-4
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