Hematopoietic Bone Marrow Hyperplasia of the Knee: Use of Out-of-Phase Gradient-Echo MR Imaging

1991 ◽  
pp. 36-39
Author(s):  
Philipp Lang ◽  
Russell Fritz ◽  
Sharmila Majumdar ◽  
Harry K. Genant
Keyword(s):  
Bone Marrow ◽  
Mr Imaging ◽  
Gradient Echo ◽  
Phase Gradient ◽  
Hematopoietic Bone Marrow

Hematopoietic bone marrow in the adult knee: spin-echo and opposed-phase gradient-echo MR imaging

1993 ◽  
Vol 22 (2) ◽  
Author(s):  
Ph. Lang ◽  
R. Fritz ◽  
S. Majumdar ◽  
M. Vahlensieck ◽  
C. Peterfy ◽  
...  
Keyword(s):  
Bone Marrow ◽  
Mr Imaging ◽  
Spin Echo ◽  
Gradient Echo ◽  
Phase Gradient ◽  
Hematopoietic Bone Marrow

MR Imaging of Bone Metastases and Choice of Sequence: Spin Echo, In-Phase Gradient Echo, Diffusion, and Contrast Medium

2009 ◽  
Vol 13 (02) ◽  
pp. 097-103 ◽  
Author(s):  
Daniel Vanel ◽  
Roberto Casadei ◽  
Marco Alberghini ◽  
Manel Razgallah ◽  
Maurizio Busacca ◽  
...  
Keyword(s):  
Mr Imaging ◽  
Bone Metastases ◽  
Contrast Medium ◽  
Spin Echo ◽  
Gradient Echo ◽  
Phase Gradient

Bone marrow fat quantification of osteoporotic vertebral compression fractures: comparison of multi-voxel proton MR spectroscopy and chemical-shift gradient-echo MR imaging

2011 ◽  
Vol 52 (9) ◽  
pp. 1032-1036 ◽  
Author(s):  
Anne Régis-Arnaud ◽  
Boris Guiu1 ◽  
Paul-Michael Walker ◽  
Denis Krausé ◽  
Frédéric Ricolfi ◽  
...  
Keyword(s):  
Bone Marrow ◽  
Mr Imaging ◽  
Phase Method ◽  
Vertebral Compression Fractures ◽  
Gradient Echo ◽  
Marrow Fat ◽  
Fat Quantification ◽  
Compression Fractures ◽  
Bone Marrow Fat ◽  
Fat Fraction

Background Only a few studies have used in/opposed phase method for a quantitative evaluation of fat fraction in the spine. Purpose To compare multivoxel proton MR spectroscopy and chemical-shift gradient-echo MR imaging for bone marrow fat quantification in vertebral compression fractures (VCF). Material and Methods Vertebral marrow fat quantification in fifteen patients was measured at 3.0-T. Multi-voxel proton spectroscopy (MRS) and in/opposed-phase MR imaging using a fat map build with a triple-echo gradient-echo sequence was used. All the patients had benign vertebral collapse. Bone marrow fat content was evaluated by both techniques in compressed (acute or chronic) and in non-compressed vertebrae. Results The percentage of fat fraction measured by the triple-echo sequence was well correlated with those calculated by MRS ( r2 = 0.85; P < 10−4). There was a significant decrease of fat fraction in acute VCF versus both chronic VCF ( P < 10−9) and non-fractured vertebrae ( P < 10−7). There was no significant difference in fat fraction evaluated by both techniques between non-fractured vertebrae and chronic VCF. Conclusion We have validated the in/opposed phase method compared with MRS for vertebral bone marrow fat quantification. The fat mapping using a triple-echo gradient-echo sequence allows distinguishing acute and chronic benign VCF.

Peritumoral spared area in fatty liver: correlation between opposed-phase gradient-echo MR imaging and CT arteriography

2001 ◽  
Vol 26 (4) ◽  
pp. 384-389 ◽  
Author(s):  
T. Gabata ◽  
M. Kadoya ◽  
O. Matsui ◽  
K. Ueda ◽  
Y. Kawamori ◽  
...  
Keyword(s):  
Mr Imaging ◽  
Fatty Liver ◽  
Gradient Echo ◽  
Phase Gradient

Accuracy of Liver Fat Quantification at MR Imaging: Comparison of Out-of-Phase Gradient-Echo and Fat-saturated Fast Spin-Echo Techniques—Initial Experience

Radiology ◽  
2005 ◽  
Vol 237 (2) ◽  
pp. 507-511 ◽  
Author(s):  
Aliya Qayyum ◽  
Jeffrey S. Goh ◽  
Sanjay Kakar ◽  
Benjamin M. Yeh ◽  
Raphael B. Merriman ◽  
...  
Keyword(s):  
Mr Imaging ◽  
Spin Echo ◽  
Liver Fat ◽  
Fast Spin Echo ◽  
Initial Experience ◽  
Gradient Echo ◽  
Fat Quantification ◽  
Phase Gradient ◽  
Fast Spin ◽  
Liver Fat Quantification

MRI of bone marrow: opposed-phase gradient-echo sequences with long repetition time

1999 ◽  
Vol 9 (4) ◽  
pp. 652-661 ◽  
Author(s):  
M. Seiderer ◽  
A. Staebler ◽  
H. Wagner
Keyword(s):  
Bone Marrow ◽  
Gradient Echo ◽  
Phase Gradient ◽  
Repetition Time

scholarly journals Vertebral Bone Marrow and Endplate Assessment on MR Imaging for the Differentiation of Modic Type 1 Endplate Changes and Infectious Spondylodiscitis

2020 ◽  
Vol 9 (3) ◽  
pp. 826 ◽  
Author(s):  
Ursula Schwarz-Nemec ◽  
Klaus M. Friedrich ◽  
Christoph Stihsen ◽  
Felix K. Schwarz ◽  
Siegfried Trattnig ◽  
...  
Keyword(s):  
Bone Marrow ◽  
Mr Imaging ◽  
Diagnostic Accuracy ◽  
Characteristic Analysis ◽  
Vertebral Bone ◽  
Endplate Changes ◽  
Modic Type ◽  
Infectious Spondylodiscitis ◽  
Vertebral Bone Marrow

On magnetic resonance (MR) imaging, Modic type 1 (MT1) endplate changes and infectious spondylodiscitis share similar findings. Therefore, this study investigated vertebral bone marrow and endplate changes to enable their differentiation. The lumbar spine MR examinations of 91 adult patients were retrospectively included: 39 with MT1; 19 with early spondylodiscitis without abscess; and 33 with advanced spondylodiscitis with abscess. The assessment included percentage of bone marrow edema on sagittal short tau inversion recovery images, and the signal ratio of edema to unaffected bone and endplate contour (normal; irregular, yet intact; blurred; destructive) on sagittal unenhanced T1-weighted images. Differences were tested for statistical significance by Chi-square test and mixed model analysis of variance. The MR diagnostic accuracy in differentiating MT1 and spondylodiscitis was assessed by cross-tabulation and receiver-operating characteristic analysis. The endplate contours, edema extents, and T1-signal ratios of MT1 (extent, 31.96%; ratio, 0.83) were significantly different (p < 0.001) from early spondylodiscitis (56.42%; 0.60), and advanced spondylodiscitis (91.84%; 0.61). The highest diagnostic accuracy (sensitivity, 94.87%; specificity, 94.23%; accuracy, 94.51%) in identifying MT1 was provided by an irregular, yet intact endplate contour. This may be a useful MR feature for the differentiation between MT1 and spondylodiscitis, particularly in its early stage.

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