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Wellenberg RHH, Boomsma MF, van Osch JAC, Vlassenbroek A, Milles J, Edens MA, Streekstra GJ, Slump CH, Maas M. Low-dose CT imaging of a total hip arthroplasty phantom using model-based iterative reconstruction and orthopedic metal artifact reduction. Skeletal Radiol 2017; 46:623-632. [PMID: 28204857 PMCID: PMC5355502 DOI: 10.1007/s00256-017-2580-2] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/22/2016] [Revised: 01/11/2017] [Accepted: 01/13/2017] [Indexed: 02/02/2023]
Abstract
OBJECTIVE To compare quantitative measures of image quality, in terms of CT number accuracy, noise, signal-to-noise-ratios (SNRs), and contrast-to-noise ratios (CNRs), at different dose levels with filtered-back-projection (FBP), iterative reconstruction (IR), and model-based iterative reconstruction (MBIR) alone and in combination with orthopedic metal artifact reduction (O-MAR) in a total hip arthroplasty (THA) phantom. MATERIALS AND METHODS Scans were acquired from high- to low-dose (CTDIvol: 40.0, 32.0, 24.0, 16.0, 8.0, and 4.0 mGy) at 120- and 140- kVp. Images were reconstructed using FBP, IR (iDose4 level 2, 4, and 6) and MBIR (IMR, level 1, 2, and 3) with and without O-MAR. CT number accuracy in Hounsfield Units (HU), noise or standard deviation, SNRs, and CNRs were analyzed. RESULTS The IMR technique showed lower noise levels (p < 0.01), higher SNRs (p < 0.001) and CNRs (p < 0.001) compared with FBP and iDose4 in all acquisitions from high- to low-dose with constant CT numbers. O-MAR reduced noise (p < 0.01) and improved SNRs (p < 0.01) and CNRs (p < 0.001) while improving CT number accuracy only at a low dose. At the low dose of 4.0 mGy, IMR level 1, 2, and 3 showed 83%, 89%, and 95% lower noise values, a factor 6.0, 9.2, and 17.9 higher SNRs, and 5.7, 8.8, and 18.2 higher CNRs compared with FBP respectively. CONCLUSIONS Based on quantitative analysis of CT number accuracy, noise values, SNRs, and CNRs, we conclude that the combined use of IMR and O-MAR enables a reduction in radiation dose of 83% compared with FBP and iDose4 in the CT imaging of a THA phantom.
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Affiliation(s)
- R H H Wellenberg
- Department of Radiology, Academic Medical Center, Meibergdreef 9, 1105 AZ, Amsterdam, The Netherlands.
| | - M F Boomsma
- Department of Radiology, Isala, Zwolle, The Netherlands
| | | | | | - J Milles
- Philips Medical Systems, Eindhoven, The Netherlands
| | - M A Edens
- Department of Innovation and Science, Isala, Zwolle, The Netherlands
| | - G J Streekstra
- Department of Radiology, Academic Medical Center, Meibergdreef 9, 1105 AZ, Amsterdam, The Netherlands
| | - C H Slump
- MIRA Institute for Biomedical Technology and Technical Medicine, University of Twente, Enschede, The Netherlands
| | - M Maas
- Department of Radiology, Academic Medical Center, Meibergdreef 9, 1105 AZ, Amsterdam, The Netherlands
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Wellenberg R, Boomsma M, van Osch J, Vlassenbroek A, Milles J, Edens M, Streekstra G, Slump C, Maas M. Quantifying metal artefact reduction using virtual monochromatic dual-layer detector spectral CT imaging in unilateral and bilateral total hip prostheses. Eur J Radiol 2017; 88:61-70. [DOI: 10.1016/j.ejrad.2017.01.002] [Citation(s) in RCA: 59] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2016] [Revised: 11/24/2016] [Accepted: 01/03/2017] [Indexed: 10/20/2022]
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Wokke B, van den Bergen J, Versluis M, Niks E, Milles J, Webb A, van Zwet E, Aartsma-Rus A, Verschuuren J, Kan H. Quantitative MRI and strength measurements in the assessment of muscle quality in Duchenne muscular dystrophy. Neuromuscul Disord 2014; 24:409-16. [DOI: 10.1016/j.nmd.2014.01.015] [Citation(s) in RCA: 99] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2013] [Revised: 01/25/2014] [Accepted: 01/31/2014] [Indexed: 10/25/2022]
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van den Bogaard SJA, Dumas EM, Hart EP, Milles J, Reilmann R, Stout JC, Craufurd D, Gibbard CR, Tabrizi SJ, van Buchem MA, van der Grond J, Roos RAC. Magnetization transfer imaging in premanifest and manifest huntington disease: a 2-year follow-up. AJNR Am J Neuroradiol 2012; 34:317-22. [PMID: 22918430 DOI: 10.3174/ajnr.a3303] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE MTI is a quantitative MR imaging technique that has recently demonstrated structural integrity differences between controls and patients with HD. Potentially, MTI can be used as a biomarker for monitoring disease progression. To establish the value of MTI as a biomarker, we aimed to examine the change in these measures during the course of HD. MATERIALS AND METHODS From the Leiden TRACK-HD study, 25 controls, 21 premanifest gene carriers, and 21 patients with manifest HD participated at baseline and during a 2-year follow-up visit. Brain segmentation of the cortical gray matter, white matter, caudate nucleus, putamen, pallidum, thalamus, amygdala, and hippocampus was performed by using the automated tools FAST and FIRST in FSL. Individual MTR values were calculated from these regions, and MTR histograms were constructed. RESULTS In the premanifest HD group stage "far from disease onset," a significant increase in MTR peak height of the putamen was observed with time. During the manifest HD stage, neither the mean MTR nor the MTR peak height showed a significant change during a 2-year follow-up. CONCLUSIONS MTI-derived measures are not suitable for monitoring in Huntington disease during a 2-year period because there was no decrease in structural integrity detected in any of the manifest HD groups longitudinally. The finding of increased putaminal MTR peak height in the premanifest far from disease onset group could relate to a predegenerative process, compensatory mechanisms, or aberrant development but should be interpreted with caution until future studies confirm this finding.
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van den Bogaard SJA, Dumas EM, Milles J, Reilmann R, Stout JC, Craufurd D, van Buchem MA, van der Grond J, Roos RAC. Magnetization transfer imaging in premanifest and manifest Huntington disease. AJNR Am J Neuroradiol 2012; 33:884-9. [PMID: 22241387 DOI: 10.3174/ajnr.a2868] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE MTI has the potential to detect abnormalities in normal-appearing white and gray matter on conventional MR imaging. Early detection methods and disease progression markers are needed in HD research. Therefore, we investigated MTI parameters and their clinical correlates in premanifest and manifest HD. MATERIALS AND METHODS From the Leiden TRACK-HD study, 78 participants (28 controls, 25 PMGC, 25 MHD) were included. Brain segmentation of cortical gray matter, white matter, caudate nucleus, putamen, pallidum, thalamus, amygdala, and hippocampus was performed using FSL's automated tools FAST and FIRST. Individual MTR values were calculated from these regions and MTR histograms constructed. Regression analysis of MTR measures from all gene carriers with clinical measures was performed. RESULTS MTR peak height was reduced in both cortical gray (P = .01) and white matter (P = .006) in manifest HD compared with controls. Mean MTR was also reduced in cortical gray matter (P = .01) and showed a trend in white matter (P = .052). Deep gray matter structures showed a uniform pattern of reduced MTR values (P < .05). No differences between premanifest gene carriers and controls were found. MTR values correlated with disease burden and motor and cognitive impairment. CONCLUSIONS Throughout the brain, disturbances in MTI parameters are apparent in early HD and are homogeneous across white and gray matter. The correlation of MTI with clinical measures indicates the potential to act as a disease monitor in clinical trials. However, our study does not provide evidence for MTI as a marker in premanifest HD.
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Affiliation(s)
- S J A van den Bogaard
- Department of Neurology, Leiden University Medical Centre, Albinusdreef 22300 RC Leiden, The Netherlands.
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van den Bogaard SJA, Dumas EM, Ferrarini L, Milles J, van Buchem MA, van der Grond J, Roos RAC. Shape analysis of subcortical nuclei in Huntington's disease, global versus local atrophy--results from the TRACK-HD study. J Neurol Sci 2011; 307:60-8. [PMID: 21624624 DOI: 10.1016/j.jns.2011.05.015] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2010] [Revised: 05/05/2011] [Accepted: 05/11/2011] [Indexed: 01/18/2023]
Abstract
Huntington's disease (HD) is characterized by brain atrophy. Localized atrophy of a specific structure could potentially be a more sensitive biomarker reflecting neuropathologic changes rather than global volume variation. We examined 90 TRACK-HD participants of which 30 were premanifest HD, 30 were manifest HD and 30 were controls. Using FMRIB's Integrated Registration and Segmentation Tool, segmentations were obtained for the pallidum, caudate nucleus, putamen, thalamus, accumbens nucleus, amygdala, and hippocampus and overall volumes were calculated. A point distribution model of each structure was obtained using Growing and Adaptive Meshes. Permutation testing between groups was performed to detect local displacement in shape between groups. In premanifest HD overall volume loss occurred in the putamen, accumbens and caudate nucleus. Overall volume reductions in manifest HD were found in all subcortical structures, except the amygdala, as compared to controls. In premanifest HD shape analysis showed small areas of displacement in the putamen, pallidum, accumbens and caudate nucleus. When the premanifest group was split into two groups according to predicted disease onset, the premanifest HD group close to expected disease onset showed more pronounced displacements in caudate nucleus and putamen compared to premanifest HD far from disease onset or the total premanifest group. Analysis of shape in manifest HD showed widespread shape differences, most prominently in the caudal part of the accumbens nucleus, body of the caudate nucleus, putamen and dorsal part of the pallidum. We conclude that shape analysis provides new insights in localized intrastructural atrophy patterns in HD, but can also potentially serve as specific target areas for disease tracking.
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Ferrarini L, Veer IM, van Lew B, Oei NYL, van Buchem MA, Reiber JHC, Rombouts SARB, Milles J. Non-parametric model selection for subject-specific topological organization of resting-state functional connectivity. Neuroimage 2011; 56:1453-62. [PMID: 21338693 DOI: 10.1016/j.neuroimage.2011.02.028] [Citation(s) in RCA: 7] [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: 10/20/2010] [Revised: 02/04/2011] [Accepted: 02/09/2011] [Indexed: 11/30/2022] Open
Abstract
In recent years, graph theory has been successfully applied to study functional and anatomical connectivity networks in the human brain. Most of these networks have shown small-world topological characteristics: high efficiency in long distance communication between nodes, combined with highly interconnected local clusters of nodes. Moreover, functional studies performed at high resolutions have presented convincing evidence that resting-state functional connectivity networks exhibits (exponentially truncated) scale-free behavior. Such evidence, however, was mostly presented qualitatively, in terms of linear regressions of the degree distributions on log-log plots. Even when quantitative measures were given, these were usually limited to the r(2) correlation coefficient. However, the r(2) statistic is not an optimal estimator of explained variance, when dealing with (truncated) power-law models. Recent developments in statistics have introduced new non-parametric approaches, based on the Kolmogorov-Smirnov test, for the problem of model selection. In this work, we have built on this idea to statistically tackle the issue of model selection for the degree distribution of functional connectivity at rest. The analysis, performed at voxel level and in a subject-specific fashion, confirmed the superiority of a truncated power-law model, showing high consistency across subjects. Moreover, the most highly connected voxels were found to be consistently part of the default mode network. Our results provide statistically sound support to the evidence previously presented in literature for a truncated power-law model of resting-state functional connectivity.
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Affiliation(s)
- Luca Ferrarini
- LKEB, Department of Radiology, Division of Image Processing, Leiden University Medical Center, Leiden, The Netherlands.
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Abbas A, Raju J, Milles J, Ramachandran S. A circadian rhythm sleep disorder: melatonin resets the biological clock. J R Coll Physicians Edinb 2010; 40:311-3. [DOI: 10.4997/jrcpe.2010.406] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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van den Bogaard SJA, Dumas EM, Milles J, van Buchem M, van der Grond J, Roos RAC. I04 Magnetic transfer imaging in premanifest and manifest Huntington's disease: results from the TRACK-HD study. J Neurol Psychiatry 2010. [DOI: 10.1136/jnnp.2010.222679.4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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van Osch M, Kies D, Teeuwisse W, Milles J, van Buchem M. Can arterial spin labeling detect differences in perfusion distribution between groups? Neuroimage 2009. [DOI: 10.1016/s1053-8119(09)70148-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Ferrarini L, Veer I, Baerends E, van Tol MJ, van der Wee N, van Buchem M, Reiber J, Rombouts SARB, Milles J. Consistency of Global and Local Efficiency across Frequency Bands in MR Functional Connectivity. Neuroimage 2009. [DOI: 10.1016/s1053-8119(09)71485-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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Milles J, van der Geest RJ, Jerosch-Herold M, Reiber JHC, Lelieveldt BPF. Fully automated registration of first-pass myocardial perfusion MRI using independent component analysis. Inf Process Med Imaging 2007; 20:544-55. [PMID: 17633728 DOI: 10.1007/978-3-540-73273-0_45] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
This paper presents a novel method for registration of cardiac perfusion MRI. The presented method successfully corrects for breathing motion without any manual interaction using Independent Component Analysis to extract physiologically relevant features together with their time-intensity behavior. A time-varying reference image mimicking intensity changes in the data of interest is computed based on the results of ICA, and used to compute the displacement caused by breathing for each frame. Qualitative and quantitative validation of the method is carried out using 46 clinical quality, short-axis, perfusion MR datasets comprising 100 images each. Validation experiments showed a reduction of the average LV motion from 1.26+/-0.87 to 0.64+/-0.46 pixels. Time-intensity curves are also improved after registration with an average error reduced from 2.65+/-7.89% to 0.87+/-3.88% between registered data and manual gold standard. We conclude that this fully automatic ICA-based method shows an excellent accuracy, robustness and computation speed, adequate for use in a clinical environment.
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Affiliation(s)
- J Milles
- Division of Image Processing, Department of Radiology, Leiden University Medical Center, Leiden, The Netherlands.
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Abstract
AIMS Dyslipidaemia in Type 2 diabetes mellitus (T2DM) is one of the major contributors in the pathogenesis of atherosclerosis. Thiazolidinediones (TZD), a class of drugs used in the treatment of T2DM, also modify lipids, especially lowering serum triglycerides and raising high-density lipoprotein cholesterol (HDL-C). METHODS We describe five patients taking rosiglitazone and a fibrate who showed a paradoxical fall in HDL-C, which would have been missed if HDL-C had not been routinely monitored. This could have had a major impact in increasing the cardiovascular risk in these patients. RESULTS Our five patients showed marked variation in both the decrease in serum HDL-C (50-89%) and also in the time taken for recovery of HDL-C after withdrawal of rosiglitazone (between 5 and 20 weeks). Apolipoprotein A1 mirrored the drop in HDL-C in four of the five patients but in one subject this was not seen, suggesting the possibility of multiple mechanisms leading to the phenomenon described, perhaps involving HDL metabolism. Improvements in glycaemic control with rosiglitazone (absolute HbA(1c) reduction between 0.6 and 3.0%) were seen in four of our patients. This suggests that the peroxisomal proliferator-activated receptor gamma signalling pathways relevant to glucose homeostasis were intact. CONCLUSION As atherosclerosis is associated with a decrease in the HDL-C level, our observations reinforce the message that HDL-C should be measured before and after the commencement of rosiglitazone and also on increasing the dosage
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Affiliation(s)
- C Shetty
- Department of Biochemistry, Good Hope Hospital NHS Hospital Trust, Sutton Coldfield, UK
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Saß V, Milles J, Krämer J, Prange A. Simple and efficient cell disruption of extremely small quantities of mycelium of phytopathogenic mycotoxin-producing moulds for quantitative extraction of genomic DNA. Mycotoxin Res 2005; 21:213-7. [DOI: 10.1007/bf02957580] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Affiliation(s)
- P H Dyer
- Department of Medicine, Birmingham Heartlands Hospital, UK
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Imray CH, Billingham M, Milles J, Wright A, Filer R, Bradwell J, Neoptolemos JP. Changes in serum lipids after exercise and on exposure to altitude. Biochem Soc Trans 1991; 19:135S. [PMID: 1889535 DOI: 10.1042/bst019135s] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- C H Imray
- Birmingham University Department of Surgery, Dudley Road Hospital
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Fletcher JA, Mijovic C, Barnett AH, Bradwell AR, Delamere J, Milles J, Wells L, Jobson S, Mackintosh P. HLA and C4 polymorphism in diabetic microangiopathy. Diabetes Res 1987; 4:101-2. [PMID: 3495390] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
We have reported an increased frequency of the rare B3 allotype of the fourth component of complement (C4B3) in insulin-dependent diabetics, especially in those with microangiopathy. This study has now been expanded--20 of 106 subjects with microangiopathy and 9 of 116 without possessed the C4B3 allotype (p less than 0.02). C4B3 is said to be in linkage disequilibrium with HLA-DR4. HLA typing was performed on 94 of these patients, 52 with and 42 without microangiopathy. There was no significant difference in the frequency of DR4 (62 vs 50%), DR3 (65 vs 52%), B8 (40 vs 40%) or B15 (32 vs 19%) respectively between these 2 groups. These results confirm an HLA-linked predisposition to microangiopathy, but do not determine whether the primary association is with C4B3, DR4 or another gene with which they are in linkage disequilibrium.
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