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Weiner S, Strinitz M, Herfurth J, Hessenauer F, Nauroth-Kreß C, Kampf T, Homola GA, Üçeyler N, Sommer C, Pham M, Schindehütte M. Dorsal Root Ganglion Volumetry by MR Gangliography. AJNR Am J Neuroradiol 2022; 43:769-775. [PMID: 35450855 PMCID: PMC9089252 DOI: 10.3174/ajnr.a7487] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2021] [Accepted: 02/12/2022] [Indexed: 12/29/2022]
Abstract
BACKGROUND AND PURPOSE Dorsal root ganglion MR imaging (MR gangliography) is increasingly gaining clinical-scientific relevance. However, dorsal root ganglion morphometry by MR imaging is typically performed under the assumption of ellipsoid geometry, which remains to be validated. MATERIALS AND METHODS Sixty-four healthy volunteers (37 [57.8%] men; mean age, 31.5 [SD, 8.3] years) underwent MR gangliography of the bilateral L4-S2 levels (3D-T2WI TSE spectral attenuated inversion recovery-sampling perfection with application-optimized contrasts by using different flip angle evolution, isotropic voxels = 1.1 mm³, TE = 301 ms). Ground truth dorsal root ganglion volumes were bilaterally determined for 96 dorsal root ganglia (derivation cohort) by expert manual 3D segmentation by 3 independent raters. These ground truth dorsal root ganglion volumes were then compared with geometric ellipsoid dorsal root ganglion approximations as commonly practiced for dorsal root ganglion morphometry. On the basis of the deviations from ellipsoid geometry, improved volume estimation could be derived and was finally applied to a large human validation cohort (510 dorsal root ganglia). RESULTS Commonly used equations of ellipsoid geometry underestimate true dorsal root ganglion volume by large degrees (factor = 0.42-0.63). Ground truth segmentation enabled substantially optimizing dorsal root ganglion geometric approximation using its principal axes lengths by deriving the dorsal root ganglion volume term of [Formula: see text]. Using this optimization, the mean volumes of 510 lumbosacral healthy dorsal root ganglia were as follows: L4: 211.3 (SD, 52.5) mm³, L5: 290.7 (SD, 90.9) mm³, S1: 384.2 (SD, 145.0) mm³, and S2: 192.4 (SD, 52.6) mm³. Dorsal root ganglion volume increased from L4 to S1 and decreased from S1 to S2 (P < .001). Dorsal root ganglion volume correlated with subject height (r = . 22, P < .001) and was higher in men (P < .001). CONCLUSIONS Dorsal root ganglion volumetry by measuring its principal geometric axes on MR gangliography can be substantially optimized. By means of this optimization, dorsal root ganglion volume distribution was estimated in a large healthy cohort for the clinically most relevant lumbosacral levels, L4-S2.
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Affiliation(s)
- S Weiner
- From the Department of Neuroradiology (S.W., M.S., J.H., F.H., C.N.-K., T.K., G.A.H., M.P., M.S.)
| | - M Strinitz
- From the Department of Neuroradiology (S.W., M.S., J.H., F.H., C.N.-K., T.K., G.A.H., M.P., M.S.)
| | - J Herfurth
- From the Department of Neuroradiology (S.W., M.S., J.H., F.H., C.N.-K., T.K., G.A.H., M.P., M.S.)
| | - F Hessenauer
- From the Department of Neuroradiology (S.W., M.S., J.H., F.H., C.N.-K., T.K., G.A.H., M.P., M.S.)
| | - C Nauroth-Kreß
- From the Department of Neuroradiology (S.W., M.S., J.H., F.H., C.N.-K., T.K., G.A.H., M.P., M.S.)
| | - T Kampf
- From the Department of Neuroradiology (S.W., M.S., J.H., F.H., C.N.-K., T.K., G.A.H., M.P., M.S.)
| | - G A Homola
- From the Department of Neuroradiology (S.W., M.S., J.H., F.H., C.N.-K., T.K., G.A.H., M.P., M.S.)
| | - N Üçeyler
- Neurology (N.U., C.S.), University Hospital Würzburg, Würzburg, Germany
| | - C Sommer
- Neurology (N.U., C.S.), University Hospital Würzburg, Würzburg, Germany
| | - M Pham
- From the Department of Neuroradiology (S.W., M.S., J.H., F.H., C.N.-K., T.K., G.A.H., M.P., M.S.)
| | - M Schindehütte
- From the Department of Neuroradiology (S.W., M.S., J.H., F.H., C.N.-K., T.K., G.A.H., M.P., M.S.)
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Müller R, Henss A, Kampschulte M, Rohnke M, Langheinrich AC, Heiss C, Janek J, Voigt A, Wilke HJ, Ignatius A, Herfurth J, El Khassawna T, Deutsch A. Analysis of microscopic bone properties in an osteoporotic sheep model: a combined biomechanics, FE and ToF-SIMS study. J R Soc Interface 2020; 16:20180793. [PMID: 30958193 DOI: 10.1098/rsif.2018.0793] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
The present study deals with the characterization of bone quality in a sheep model of postmenopausal osteoporosis. Sheep were sham operated ( n = 7), ovariectomized ( n = 6), ovariectomized and treated with deficient diet ( n = 8) or ovariectomized, treated with deficient diet and glucocorticoid injections ( n = 7). The focus of the study is on the microscopic properties at tissue level. Microscopic mechanical properties of osteoporotic bone were evaluated by a combination of biomechanical testing and mathematical modelling. Sample stiffness and strength were determined by compression tests and finite-element analysis of stress states was conducted. From this, an averaged microscopic Young's modulus at tissue level was determined. Trabecular structure as well as mineral and collagen distribution in samples of sheep vertebrae were analysed by micro-computed tomography and time-of-flight secondary ion mass spectrometry. In the osteoporotic sheep model, a disturbed fibril structure in the triple treated group was observed, but bone loss only occurred in form of reduced trabecular number and thickness and cortical decline, while quality of the residual bone was preserved. The preserved bone tissue properties in the osteoporotic sheep model allowed for an estimation of bone strength which behaves similar to the human case.
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Affiliation(s)
- R Müller
- 1 Centre for Information Services and High Performance Computing , TU Dresden, 01062 Dresden , Germany
| | - A Henss
- 2 Institute of Physical Chemistry and Center for Materials Research (ZfM/LaMa), Justus-Liebig University of Giessen , 35392 Giessen , Germany
| | - M Kampschulte
- 4 Department of Diagnostic and Interventional Radiology, University Hospital of Giessen-Marburg , 35392 Giessen , Germany
| | - M Rohnke
- 2 Institute of Physical Chemistry and Center for Materials Research (ZfM/LaMa), Justus-Liebig University of Giessen , 35392 Giessen , Germany
| | - A C Langheinrich
- 6 Department of Diagnostic and Interventional Radiology, BG Trauma Hospital , 60389 Frankfurt/Main , Germany
| | - C Heiss
- 3 Experimental Trauma Surgery, Justus-Liebig University of Giessen , 35392 Giessen , Germany.,5 Department of Trauma, Hand, and Reconstructive Surgery, University Hospital of Giessen-Marburg , Giessen , Germany
| | - J Janek
- 2 Institute of Physical Chemistry and Center for Materials Research (ZfM/LaMa), Justus-Liebig University of Giessen , 35392 Giessen , Germany
| | - A Voigt
- 8 Institute of Scientific Computing , TU Dresden, 01062 Dresden , Germany
| | - H J Wilke
- 7 Institute of Orthopaedic Research and Biomechanics, Trauma Research Centre, Ulm University-Medical Centre , Ulm , Germany
| | - A Ignatius
- 7 Institute of Orthopaedic Research and Biomechanics, Trauma Research Centre, Ulm University-Medical Centre , Ulm , Germany
| | - J Herfurth
- 3 Experimental Trauma Surgery, Justus-Liebig University of Giessen , 35392 Giessen , Germany
| | - T El Khassawna
- 3 Experimental Trauma Surgery, Justus-Liebig University of Giessen , 35392 Giessen , Germany
| | - A Deutsch
- 1 Centre for Information Services and High Performance Computing , TU Dresden, 01062 Dresden , Germany
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Paschke R, Eck T, Herfurth J, Usadel KH. Stimulation of proliferation and inhibition of function of xenotransplanted human thyroid tissue by epidermal growth factor. J Endocrinol Invest 1995; 18:359-63. [PMID: 7594224 DOI: 10.1007/bf03347838] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
A stimulation of thyroid epithelial cell proliferation by epidermal growth factor (EGF) has been repeatedly reported in different in vitro systems. Furthermore, a suppression of thyroid epithelial cell function by EGF has been described in vitro. In order to investigate the effects of EGF on the thyroid in vivo, human Graves' disease tissue was transplanted to 59 nu/nu mice. EGF was given once, and over a period of 7 days 7 times intermittently or continuously by osmotic mini pumps to mice. 3-H-thymidine histoautoradiography of transplants showed an increased 3-H-thymidine incorporation of thyroid epithelial cells and mesenchymal cells, following each form of EGF application. Thyroid epithelial cell nuclear volume, which has previously been shown to be a parameter for thyroid epithelial cell function showed a decrease following EGF application. There was a tendency to a more intensive proliferation and differentiation following intermittent EGF application compared to continuous stimulation. These results demonstrate that EGF does stimulate proliferation of thyroid epithelial as well as mesenchymal cells in vivo. The growth stimulating effect of EGF is linked with a concomitant decrease of thyroid function in vivo. The latter is most likely due to the dedifferentiating action of EGF previously shown in in vitro systems.
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Affiliation(s)
- R Paschke
- II. Medizinische Klinik, Klinikum Mannheim der Universität Heidelberg, FRG
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