scholarly journals Comparison of 3T and 7T MRI for the visualization of globus pallidus sub-segments

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Shuki Maruyama ◽  
Masaki Fukunaga ◽  
Hans-Peter Fautz ◽  
Robin Heidemann ◽  
Norihiro Sadato
Keyword(s):  
Globus Pallidus ◽  
Signal Intensity ◽  
Single Channel ◽  
Spin Echo ◽  
High Signal ◽  
Proton Density ◽  
Internal Globus Pallidus ◽  
Internal Structures ◽  
Electrode Localization ◽  
Straight Lines

AbstractThe success of deep brain stimulation (DBS) targeting the internal globus pallidus (GPi) depends on the accuracy of electrode localization inside the GPi. In this study, we sought to compare visualization of the medial medullary lamina (MML) and accessory medullary lamina (AML) between proton density-weighted (PDW) and T2-weighted (T2W) sequences on 3T and 7T MRI scanners. Eleven healthy participants (five men and six women; age, 19–28 years; mean, 21.5) and one 61-year-old man were scanned using two-dimensional turbo spin-echo PDW and T2W sequences on 3T and 7T MRI scanners with a 32-channel receiver head coil and a single-channel transmission coil. Profiles of signal intensity were obtained from the pixel values of straight lines over the GP regions crossing the MML and AML. Contrast ratios (CRs) for GPe/MML, GPie/MML, GPie/AML, and GPii/AML were calculated. Qualitatively, 7T visualized both the MML and AML, whereas 3T visualized the MML less clearly and hardly depicted the AML. The T2W sequence at 7T yielded significantly higher CRs for GPie/MML, GPie/AML, and GPii/AML than the PDW sequence at 7T or 3T. The T2W sequence at 7T allows visualization of the internal structures of GPi segments with high signal intensity and contrast.

scholarly journals High Signal Intensity of Fat on Fast Spin Echo Imaging

2000 ◽  
Vol 56 (10) ◽  
pp. 1269-1275
Author(s):  
Akio OGURA ◽  
Masaru YAMAZAKI ◽  
Takaharu HONGOH ◽  
Hiroshi INOUE ◽  
Akihiro ISHIKURO
Keyword(s):  
Signal Intensity ◽  
Spin Echo ◽  
High Signal Intensity ◽  
Fast Spin Echo ◽  
High Signal ◽  
Fast Spin

Central Spinal Cord Injury: Magnetic Resonance Imaging Confirmation and Operative Considerations

Neurosurgery ◽  
1988 ◽  
Vol 22 (2) ◽  
pp. 340-347 ◽  
Author(s):  
John L. Fox ◽  
Louis Wener ◽  
Dale C. Drennan ◽  
Herbert J. Manz ◽  
Daniel J. Won ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Spinal Cord ◽  
Spinal Cord Injury ◽  
Magnetic Resonance ◽  
Signal Intensity ◽  
High Signal ◽  
Proton Density ◽  
Resonance Imaging ◽  
Cord Injury ◽  
Central Cord Syndrome

Abstract A case of central cervical spinal cord injury, confirmed by magnetic resonance imaging (MRI) and treated by myelotomy, is presented. After recovering well from his central cord syndrome and walking with assistance, the patient developed a rapidly progressive myelopathy beginning 2 months after injury. His main injury localized clinically to the C8, T1 level; but central cord abnormalities were identified 3 months after injury at the C6 level by MRI: a high signal intensity on the proton density sequence and a low-signal intensity on the T1-weighted sequence. At operation 4½; months after his injury and 1 month after complete paraplegia, a myelotomy at C6 failed to reveal any cavity (syrinx) but instead disclosed only intense gliosis inside a slightly atrophic spinal cord. Rapid clinical improvement ensued. Secondary syringomyelia may be an endstage condition after spinal cord insults that trigger a progressive, pathophysiological reaction leading to central cord necrosis. In selected cases, myelotomy may interrupt this MRI-identified, nosogenic process before cavitation has occurred. (Neurosurgery 22:340-347, 1988)

Case 13.16

2014 ◽  
pp. 643-644
Author(s):  
Christine U. Lee ◽  
James F. Glockner
Keyword(s):  
Coronary Artery Disease ◽  
Coronary Artery ◽  
Signal Intensity ◽  
Left Atrial ◽  
Interatrial Septum ◽  
High Signal Intensity ◽  
High Signal ◽  
Proton Density ◽  
Cine Ssfp ◽  
Artery Disease

72-year-old woman with known coronary artery disease; echocardiography noted a possible left atrial mass, and MRI was suggested for further assessment Horizontal long-axis images from a cine SSFP acquisition (Figure 13.16.1) demonstrate dumbbell-shaped widening of the interatrial septum with uniform high signal intensity. Axial double inversion recovery FSE proton density-weighted images (...

Discovertebral Junction of the Spine — A Cadaveric Study by Spin-Echo MR Imaging

1995 ◽  
Vol 36 (1) ◽  
pp. 1-8
Author(s):  
Y. Kakitsubata ◽  
K. Nabeshima ◽  
S. Kakitsubata ◽  
M. Koono ◽  
K. Watanabe
Keyword(s):  
Bone Marrow ◽  
Mr Imaging ◽  
Signal Intensity ◽  
Spin Echo ◽  
Surface Coil ◽  
Proton Density ◽  
Mr Images ◽  
Small Surface ◽  
Intermediate Signal Intensity ◽  
Head Coil

To evaluate the MR appearance of the discovertebral junction (DVJ) of the spine, we examined 161 DVJs in 27 cadaveric spines using superconductive MR imaging. T1-, proton density-, and T2-weighted spin-echo imaging were used. With a small surface coil, higher resolution and more sharply defined contours of the DVJ were obtained than when using a head coil. Cortical bone had very low signal intensity in all sequences. Cartilaginous end-plate (CP) was of low to intermediate signal intensity on T1-weighted images, and of low signal intensity on proton density- and T2-weighted images. MR images were able to reveal the gross CP appearances, Schmorl's nodules, and adjacent bone marrow pathology. We conclude that MR imaging is valuable for assessing abnormalities of the DVJ.

scholarly journals Magnetic resonance imaging of the normal dromedary camel tarsus

2020 ◽  
Author(s):  
Usama Hagag ◽  
Zakriya Ali Almohamad ◽  
Mohamed Gomaa Tawfiek ◽  
Ayman El Nahas
Keyword(s):  
Magnetic Resonance Imaging ◽  
Articular Cartilage ◽  
Magnetic Resonance ◽  
Signal Intensity ◽  
High Signal ◽  
Proton Density ◽  
Dromedary Camel ◽  
Resonance Imaging ◽  
Intermediate Signal Intensity ◽  
Tarsal Bones

Abstract Background: Magnetic resonance imaging (MRI) is the most versatile and informative imaging modality for the diagnosis of locomotor injuries in many animal species; however, veterinary literature describing the MRI of the dromedary camel tarsus is lacking. Our purpose was to describe and compare the MRI images of twelve cadaveric tarsi, examined in a 1.5 Tesla MRI scanner, with their corresponding anatomical gross sections. Turbo spin-echo (TSE) T1-weighted (T1), T2-weighted (T2), proton density-weighted (PD), and short tau inversion recovery (STIR) sequences were obtained in 3 planes. Tarsi were sectioned in sagittal, dorsal, and transverse planes. MRI images from different sequences and planes were described and compared with the anatomical sections.Results: The soft and osseous tissues of the dromedary camel tarsus corresponded extensively with the gross anatomic sections. T1 and PD images provided high anatomical details and the synovial fluid had high signal intensity on T2, PD, and STIR sequences and intermediate signal intensity on T1 images. The tibial cochlea, tarsal bones, and the proximal metatarsus were evaluated in all planes. The sagittal and dorsal images were useful for the evaluation of articular cartilage and subchondral bone. Articular cartilage had homogenous intermediate signal intensity on the T1 images and low signal intensity on the T2 and PD images. The Subchondral and cortical bone had low signal intensity on all sequences, and the cancellous bone expressed heterogeneous signal intensity on PD, T1, and T2 images. The tarsal tendons and ligaments had low signal intensity in all sequences including: the tendons of fibularis tertius, long digital extensor, cranial tibial, fibularis longus, lateral digital extensor muscles; the common tendon of the caudal tibial and lateral digital flexor muscles; the medial digital flexor tendon; the long and short bundles of the medial and lateral collateral ligaments; the superficial and deep digital flexor tendons; and the long plantar ligament. Conclusions: MRI images provided a thorough evaluation of the normal dromedary camel tarsus. Information provided in the current study is expected to serve as a basis for interpretation in clinical situations.

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