High-resolution MR-imaging of the liver with T2-weighted sequences using integrated parallel imaging: Comparison of prospective motion correction and respiratory triggering

2004 ◽  
Vol 20 (3) ◽  
pp. 443-450 ◽  
Author(s):  
Christoph J. Zech ◽  
Karin A. Herrmann ◽  
Armin Huber ◽  
Olaf Dietrich ◽  
Alto Stemmer ◽  
...  
Keyword(s):  
High Resolution ◽  
Mr Imaging ◽  
Motion Correction ◽  
Parallel Imaging ◽  
Weighted Sequences ◽  
Respiratory Triggering

scholarly journals High-resolution dynamic MR imaging of the thorax for respiratory motion correction of PET using groupwise manifold alignment

2014 ◽  
Vol 18 (7) ◽  
pp. 939-952 ◽  
Author(s):  
Christian F. Baumgartner ◽  
Christoph Kolbitsch ◽  
Daniel R. Balfour ◽  
Paul K. Marsden ◽  
Jamie R. McClelland ◽  
...  
Keyword(s):  
High Resolution ◽  
Mr Imaging ◽  
Motion Correction ◽  
Respiratory Motion ◽  
Respiratory Motion Correction ◽  
Dynamic Mr Imaging ◽  
Manifold Alignment ◽  
Dynamic Mr

scholarly journals MR Imaging–Pathologic Correlation of Uveal Melanomas Undergoing Secondary Enucleation after Proton Beam Radiotherapy

2021 ◽  
Vol 11 (9) ◽  
pp. 4310
Author(s):  
Pietro Valerio Foti ◽  
Corrado Inì ◽  
Mario Travali ◽  
Renato Farina ◽  
Stefano Palmucci ◽  
...  
Keyword(s):  
Mr Imaging ◽  
Proton Beam ◽  
Uveal Melanoma ◽  
Vitreous Hemorrhage ◽  
Nerve Degeneration ◽  
Proton Beam Radiotherapy ◽  
Iris Neovascularization ◽  
Weighted Sequences ◽  
Histopathologic Findings ◽  
Optic Nerve Degeneration

Background: Currently, radiotherapy represents the most widely employed therapeutic option in patients with uveal melanoma. Although the effects of proton beam radiotherapy on uveal melanoma end ocular tissues have been histologically documented, their appearance at MR imaging is still poorly understood. The purpose of our study was to elucidate the magnetic resonance (MR) semiotics of radiotherapy-induced changes to neoplastic tissues and ocular structures in patients with uveal melanoma undergoing secondary enucleation after proton beam radiotherapy. Methods: Nine patients with uveal melanoma who had undergone proton beam radiotherapy, MR imaging, and subsequent secondary enucleation were retrospectively selected. The histopathologic findings evaluated for irradiated tumors were necrosis, fibrosis, and viable tumor, while the histopathologic findings evaluated for extratumoral ocular/periocular tissues were radiation-related intraocular inflammation, vitreous hemorrhage, optic nerve degeneration, iris neovascularization, and periocular fibrotic adhesions. On MR images, the appearance of the abovementioned histologic features was assessed on conventional and diffusion-weighted sequences. Results: T2-weighted sequences performed better in detecting radiation-induced necrosis, fibrosis, optic nerve degeneration, and periocular fibrotic adhesions. T1-weighted sequences were preferable for identifying cataracts, vitreous hemorrhage, and inflammatory complications. Contrast-enhanced T1-weighted sequences were irreplaceable in assessing iris neovascularization, and in confirming inflammatory complications. Conclusions: In the light of their increasing role in the multidisciplinary management of patients with uveal melanoma, radiologists should be aware of the MR appearance of the effects of radiotherapy on neoplastic and ocular tissue, in order to improve the accuracy of follow-up MR examinations.

scholarly journals High-resolution dynamic oxygen-17 MR imaging of mouse brain with golden-ratio-based radial sampling and k-space-weighted image reconstruction

2017 ◽  
Vol 79 (1) ◽  
pp. 256-263 ◽  
Author(s):  
Yuchi Liu ◽  
Yifan Zhang ◽  
Chunying Wu ◽  
Junqing Zhu ◽  
Charlie Wang ◽  
...  
Keyword(s):  
High Resolution ◽  
Image Reconstruction ◽  
Mr Imaging ◽  
Mouse Brain ◽  
Golden Ratio ◽  
Weighted Image ◽  
Radial Sampling

scholarly journals Respiratory and cardiac motion correction in dual gated PET/MR imaging

2015 ◽  
Vol 2 (S1) ◽  
Author(s):  
Hadi Fayad ◽  
Florian Monnier ◽  
Freedy Odille ◽  
Jacques Felblinger ◽  
Frederic Lamare ◽  
...  
Keyword(s):  
Mr Imaging ◽  
Motion Correction ◽  
Cardiac Motion ◽  
Gated Pet

High-resolution MR imaging appearance of colonic tissue in rabbits using an endoluminal coil

2005 ◽  
Vol 18 (5) ◽  
pp. 238-244 ◽  
Author(s):  
Frank Pilleul ◽  
Olivier Beuf ◽  
Claire Godefroy ◽  
Jean-Yves Scoazec ◽  
Mircea Armenean ◽  
...  
Keyword(s):  
High Resolution ◽  
Mr Imaging ◽  
Colonic Tissue ◽  
Imaging Appearance

Dysprosium-enhanced MR imaging for tumor tissue characterization

1997 ◽  
Vol 38 (2) ◽  
pp. 281-286 ◽  
Author(s):  
C. Wang ◽  
A. Sundin ◽  
A. Ericsson ◽  
T. Bach-Gansmo ◽  
A. Hemmingsson ◽  
...  
Keyword(s):  
Mr Imaging ◽  
Tissue Characterization ◽  
Tumor Tissue ◽  
Tumor Model ◽  
Human Colon ◽  
Mr Images ◽  
Histological Sections ◽  
Necrotic Tumor ◽  
Before And After ◽  
Weighted Sequences

Purpose: to evaluate dysprosium-enhanced MR imaging for differentiation between morphologically intact and necrotic tumor tissue in a tumor model. Material and Methods: A human colon carcinoma was transplanted subcutaneously into 9 nude (immunodeprived) rats. MR imaging was performed before and after injection of the dysprosium agent Dy-DTPA-BMA. T1-, T2- and T2*-weighted sequences were acquired. the tumors were dissected, histological sections were prepared, and compared with corresponding MR images. Results: in intact tissue, the MR signal intensity in the T2- and T2*-weighted images decreased after Dy injection and the delineation of the intact regions were sharp and corresponded well to the gross histological sections. Conclusion: Dy-enhanced MR imaging facilitated the differentiation between intact and necrotic tumor tissue.

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