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97 results for “phase contrast”
Figure 14 in Phase contrast X-ray synchrotron microtomography and the oldest damselflies in amber (Odonata: Zygoptera: Hemiphlebiidae)
Figure 14. Electrohemiphlebia barucheli gen. et sp. nov., holotype ARC 372.1, apical part of forewing.
Figure 7 in Phase contrast X-ray synchrotron microtomography and the oldest damselflies in amber (Odonata: Zygoptera: Hemiphlebiidae)
Figure 7. Electrohemiphlebia barucheli gen. et sp. nov., holotype ARC 372.1, legs.
Figure 4 in Phase contrast X-ray synchrotron microtomography and the oldest damselflies in amber (Odonata: Zygoptera: Hemiphlebiidae)
Figure 4. Electrohemiphlebia barucheli gen. et sp. nov., holotype ARC 372.1, frontal view of head.
Aortic Dissection With 4-dimensional Phase-contrast Magnetic Resonance Imaging
ClinicalTrials.gov study NCT04481542. IPD Sharing: NO. Countries: 1. Publications: 0.
Cerebrospinal Fluid Movements Through Interventricular Foramina in Phase Contrast Magnetic Resonance Imaging (PC-MRI)
ClinicalTrials.gov study NCT04145414. IPD Sharing: NO. Countries: 1. Publications: 0.
Evaluation of Perforator Phase Contrast Angiography in Developing Surgery Plans for Patients With Breast Cancer Undergoing Breast Reconstruction With Free-Flap Methods After Mastectomy
ClinicalTrials.gov study NCT04063410. IPD Sharing: Not stated. Countries: 1. Publications: 0.
Imaging Quality and Potential Clinical Relevance of Phase Contrast Mammography In-vivo: a Single-center, Prospective Study
ClinicalTrials.gov study NCT06489665. IPD Sharing: NO. Countries: 1. Publications: 0.
Phase 2 Ascending Dose Safety and Efficacy Study of RVP-001, a Manganese-based MRI Contrast Agent
ClinicalTrials.gov study NCT06322342. IPD Sharing: NO. Countries: 1. Publications: 0.
Phase 4 Paediatric Study to Evaluate Sonazoid Safety and Efficacy for Contrast-Enhanced Ultrasound Liver Imaging
ClinicalTrials.gov study NCT06639828. IPD Sharing: NO. Countries: 3. Publications: 0.
4D Phase Contrast MR: Hypertrophy in Liver Cancer
ClinicalTrials.gov study NCT02618447. IPD Sharing: NO. Countries: 1. Publications: 0.
Phase Ib, Administration the IOP Injection for MRI Contrast Agent in Healthy Subjects
ClinicalTrials.gov study NCT03399214. IPD Sharing: NO. Countries: 1. Publications: 0.
The Effect of Erythropoietin Usage in Renal Function After Kidney Transplantation, in Early Phase, in Contrast to Placebo Group
ClinicalTrials.gov study NCT00617474. IPD Sharing: Not stated. Countries: 0. Publications: 0.
Carotid Phase-Contrast Magnetic Resonance before Treatment: 4D-Flow versus Standard 2D Imaging
<p>Secchi F, Monti CB, Capra D, Vitale R, Mazzaccaro D, Conti M, Jin N, Giese D, Nano G, Sardanelli F, Marrocco-Trischitta MM. Carotid Phase-Contrast Magnetic Resonance before Treatment: 4D-Flow versus Standard 2D Imaging. Tomography. 2021 Sep 28;7(4):513-522. doi: 10.3390/tomography7040044. PMID: 34698250; PMCID: PMC8544659.</p> <p>Abstract</p> <p>The purpose of this study was to evaluate the level of agreement between flow/velocity data obtained from 2D-phase-contrast (PC) and 4D-flow in patients scheduled for treatment of carotid artery stenosis. Image acquisition was performed using a 1.5 T scanner. We compared mean flow rates, vessel areas, and peak velocities obtained during the acquisition with both techniques in 20 consecutive patients, 15 males and 5 females aged 69 ± 5 years (mean ± standard deviation). There was a good correlation between both techniques for the CCA flow (<em>r</em> = 0.65, <em>p</em> < 0.001), whereas for the ICA flow and ECA flow the correlation was only moderate (<em>r</em> = 0.4, <em>p</em> = 0.011 and <em>r</em> = 0.45, <em>p</em> = 0.003, respectively). Correlations of peak velocities between methods were good for CCA (<em>r</em> = 0.56, <em>p</em> < 0.001) and moderate for ECA (<em>r</em> = 0.41, <em>p</em> = 0.008). There was no correlation for ICA (<em>r</em> = 0.04, <em>p</em> = 0.805). Cross-sectional area values between methods showed no significant correlations for CCA (<em>r</em> = 0.18, <em>p</em> = 0.269), ICA (<em>r</em> = 0.1, <em>p</em> = 0.543), and ECA (<em>r</em> = 0.05, <em>p</em> = 0.767). Conclusion: the 4D-flow imaging provided a good correlation of CCA and a moderate correlation of ICA flow rates against 2D-PC, underestimating peak velocities and overestimating cross-sectional areas in all carotid segments.</p>
Tomographic datasets for '3d virtual histology of human cerebellum by x-ray phase-contrast tomography'
<p>Tomographic datasets for '3d virtual histology of human cerebellum by x-ray phase-contrast tomography' by M. Töpperwien et al. (PNAS 2018). Reconstructed volumes of both the measurements at the GINIX endstation at PETRAIII (DESY@Hamburg) and the laboratory setup are given. The datasets are saved as .raw in single-precision floating-point format and the size of each dataset is indicated in the filename. Note that in both cases the datasets are those used for the automatic segmentation via the Spherical Hough transform, meaning that for the GINIX dataset the volume was resampled by a factor of 2 and the individual slices were subsequently filtered with a Gaussian with a standard deviation of 0.3 pixels whereas for the laboratory data, the volume was reconstructed at full resolution, followed by a lowpass filtering step.</p> <p>Additionally, the output of the segmentation workflow is given as .dat files, specifying the determined cell positions and radii for both datasets.</p>
Computation of contrast-enhanced perfusion using only two CT scan phases: a proof-of-concept study on abdominal organs
<p>Cressoni M, Cozzi A, Schiaffino S, Cadringher P, Vitali P, Basso G, Ippolito D, Sardanelli F. Computation of contrast-enhanced perfusion using only two CT scan phases: a proof-of-concept study on abdominal organs. Eur Radiol Exp. 2022 Aug 29;6(1):37. doi: 10.1186/s41747-022-00292-y. PMID: 36031643; PMCID: PMC9420683.</p> <p>Abstract</p> <p><strong>Background: </strong>Computed tomography perfusion imaging (CTPI) by repeated scanning has clinical relevance but implies relatively high radiation exposure. We present a method to measure perfusion from two CT scan phases only, considering tissue enhancement, feeding vessel (aortic) peak enhancement, and bolus shape.</p> <p><strong>Methods: </strong>CTPI scans (each with 40 frames acquired every 1.5 s) of 11 patients with advanced hepatocellular carcinoma (HCC) enrolled between 2012 and 2016 were retrospectively analysed (aged 69 ± 9 years, 8/11 males). Perfusion was defined as the maximal slope of the time-enhancement curve divided by the peak enhancement of the feeding vessel (aorta). Perfusion was computed two times, first using the maximum slope derived from all data points and then using the peak tissue enhancement and the bolus shape obtained from the aortic curve.</p> <p><strong>Results: </strong>Perfusion values from the two methods were linearly related (r<sup>2</sup> = 0.92, p < 0.001; Bland-Altman analysis bias -0.12). The mathematical model showed that the perfusion ratio of two ROIs with the same feeding vessel (aorta) corresponds to their peak enhancement ratio (r<sup>2</sup> = 0.55, p < 0.001; Bland-Altman analysis bias -0.68). The relationship between perfusion and tissue enhancement is predicted to be linear in the clinical range of interest, being only function of perfusion, peak feeding vessel enhancement, and bolus shape.</p> <p><strong>Conclusions: </strong>This proof-of-concept study showed that perfusion values of HCC, kidney, and pancreas could be computed using enhancement measured only with two CT scan phases, if aortic peak enhancement and bolus shape are known.</p> <p> </p>
Datasets for 'Fiber orientation in a whole mouse heart reconstructed by laboratory phase-contrast micro-CT'
<p>Tomographic dataset, vectorfield of the myocyte orientation and video for 'Fiber orientation in a whole mouse heart reconstructed by laboratory phase-contrast micro-CT' by M. Reichardt et al.. Reconstructed volume at the laboratory setup is given. The tomographic dataset is saved as .raw in single-precision floating-point format and the size of each dataset is indicated in the filename. The vectorfield is saved as .vtk used for Paraview.</p>
phase-contrast chest radiographs
<p>see <a href="https://doi.org/10.5281/zenodo.7030750">https://doi.org/10.5281/zenodo.7030750</a></p>
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Allen Brain Atlas
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International Brain Laboratory public data
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OpenNeuro
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