Anatomic Study of the Quadrigeminal Cistern in Patients With 3-Dimensional Magnetic Resonance Cisternography

Neurosurgery ◽  
2010 ◽  
Vol 66 (5) ◽  
pp. 991-998 ◽  
Author(s):  
Laura Columbano ◽  
Lennart H. Stieglitz ◽  
Karsten H. Wrede ◽  
Amir Samii ◽  
Madjid Samii ◽  
...  
Keyword(s):  
Standard Deviation ◽  
Magnetic Resonance ◽  
Pineal Gland ◽  
Superior Colliculus ◽  
Inferior Colliculus ◽  
3 Dimensional ◽  
Quadrigeminal Cistern ◽  
Dimensional Reconstruction ◽  
Quadrigeminal Plate ◽  
The Right

Abstract OBJECT The aim of this study was to demonstrate the anatomy of the quadrigeminal cistern, define the anatomic landmarks, and measure the extension of the cistern in the living by using magnetic resonance (MR) cisternography with 3-dimensional reconstruction. METHODS The quadrigeminal cistern was examined in 38 patients. We focused on measurements of the superior, posterior, and lateral limits; the anterior and posterior maximal rostrocaudal diameter; the distance between the right and left superior colliculus and the right and left inferior colliculus; and the angle between the quadrigeminal plate and pineal gland. RESULTS The highest variability was observed for the posterior rostrocaudal diameter with a standard deviation of 3.1 and a range from 8 to 21.1 mm followed by the anterior-posterior diameter with a standard deviation of 2.8 and a range from 6.4 to 16.5 mm. In all cases the distance between the right and left superior colliculus (13.3 ± 1.8 mm; mean ± SD) was longer than the distance between the right and left inferior colliculus (11.4 ± 1.3 mm; mean ± SD). We classified 2 types of cisterns: closed cisterns with angles between the quadrigeminal plate and the pineal gland ranging from 39° to 63° and open cisterns with angles ranging from 63° to 76°. The analysis of variability by age and sex showed no significant differences. CONCLUSIONS The MR cisternography with 3-dimensional reconstruction was a simple and noninvasive tool providing detailed anatomic information in the living. It allowed measurement of the high variability of morphology of the quadrigeminal cistern. We defined the lateral landmarks and identified the lateral limit of the cistern. We classified the different shapes of the quadrigeminal cistern as open or closed cisterns. This can be helpful in the choice of the surgical approach to the lesions arising in this area.

CALCIFYING PSEUDONEOPLASM OF THE INFERIOR COLLICULUS: AN UNUSUAL LOCATION FOR A RARE TUMOR: CASE REPORT

Neurosurgery ◽  
2009 ◽  
Vol 65 (5) ◽  
pp. E1005-E1006 ◽  
Author(s):  
Guilherme Ramina Montibeller ◽  
Alexandru-Constantin Stan ◽  
Joachim Kurt Krauss ◽  
Makoto Nakamura
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Inferior Colliculus ◽  
Vascular Lesions ◽  
Surgical Removal ◽  
Resonance Imaging ◽  
First Case ◽  
The Central Nervous System ◽  
Quadrigeminal Plate ◽  
The Right

Abstract OBJECTIVE Quadrigeminal plate lesions are rare and usually present with a silent clinical course. Tumors, vascular lesions, inflammatory and infectious processes have been described in this region. Calcifying pseudoneoplasms, also reported as fibro-osseous lesions, cerebral calculi, and brain stones, are unusual lesions in the central nervous system. They can be revealed by cranial radiography, computed tomography, and magnetic resonance imaging as calcified masses and should be differentiated from neoplastic, inflammatory, and vascular lesions. To the best of our knowledge, the occurrence of a calcifying pseudoneoplasm located at the quadrigeminal plate has not yet been reported. CLINICAL PRESENTATION A 67-year-old woman with a 6-month history of several daily attacks of dizziness presented to our service. Magnetic resonance imaging studies revealed a tumor in the right inferior colliculus. This lesion was isointense on T1-weighted imaging, hypointense on T2-weighted imaging, and homogeneously enhanced with contrast. INTERVENTION The lesion at the quadrigeminal plate was completely removed, and the patient was successfully treated without any new neurological deficit. At the time of follow-up, all preoperative symptoms had resolved. CONCLUSION We report the first case of a calcifying pseudoneoplasm of the inferior colliculus. Complete surgical removal of this type of tumor is feasible. We propose surgical treatment in this location when this tumor becomes symptomatic.

scholarly journals Inferior colliculus syndrome: Clinical magnetic resonance microscopy anatomic analysis on a 7 T system

2017 ◽  
Vol 5 ◽  
pp. 2050313X1774520
Author(s):  
Ingrid L Kwee ◽  
Hitoshi Matsuzawa ◽  
Kazunori Nakada ◽  
Yukihiko Fujii ◽  
Tsutomu Nakada
Keyword(s):  
Hearing Loss ◽  
Magnetic Resonance ◽  
Inferior Colliculus ◽  
Sound Localization ◽  
Imaging System ◽  
Central Nucleus ◽  
Magnetic Resonance Microscopy ◽  
Magnetic Resonance Imaging System ◽  
The Right ◽  
T System

We performed detailed structural analysis of a case of a unilateral lesion of the inferior colliculus using magnetic resonance microscopy on a 7 T system. A 36-year-old right-handed man had an intracerebral hemorrhage circumscribed to the right inferior colliculus. Following recovery from the acute phase, he had only residual left ear tinnitus and left trochlear palsy and no hearing loss. Microscopic imaging analysis on a 7 T magnetic resonance imaging system demonstrated a chronic lesion confined primarily to the right central nucleus of the inferior colliculus. Sound localization was significantly impaired in the contralateral hemispace. The case confirms prior clinical reports of unilateral inferior colliculus dysfunction, the specific anatomic characterization of which was demonstrated in this case by magnetic resonance microscopy. It furthermore supports the notion that central nucleus of the inferior colliculus dysfunction can produce tinnitus and sound localization deficits, without hearing loss

Quantification of morphologic and hemodynamic severity of coarctation of the aorta by magnetic resonance imaging

2001 ◽  
Vol 11 (5) ◽  
pp. 512-520 ◽  
Author(s):  
Matthias Gutberlet ◽  
Norbert Hosten ◽  
Michael Vogel ◽  
Hasim Abdul-Khaliq ◽  
Tilman Ehrenstein ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Coarctation Of The Aorta ◽  
Resonance Imaging ◽  
Velocity Mapping ◽  
Multiplanar Reformation ◽  
3 Dimensional ◽  
Dimensional Reconstruction ◽  
Hemodynamic Measurements ◽  
Biplane Angiography

Objective: As the morpholgic severity of coarctation of the aorta is difficult to assess, especially after previous repair, the value of the technique of multiplanar reconstruction of magnetic resonance imaging data to achieve a 3-dimensional reconstruction of the aortic arch was evaluated and compared to hemodynamic measurements. Methods and Results: We performed 30 examinations in 27 patients aged from 6 to 54 years, with a mean of 21 years, by magnetic resonance imaging using a 1.5 Tesla scanner with a standard body coil. Measurements of flow across the coarctation were performed using phase! shift velocity mapping, and peak velocity was calculated at the site of stenosis. Aortic cross-sectional area before, at, and beyond the stenosis was reconstructed 3-dimensionally to calculate a percentage degree of stenosis. Morphologic severity of stenosis was correlated to invasively assessed hemodynamic gradients and morphologic data from biplane angiography in 23 patients. Among the 30 examinations, 24 patients had been previously treated by either surgery, in 17 patients, or balloon dilation, while 6 had native coarctation. 3-dimensional reconstruction was possible in all and better delineated the anatomy concerning the hemodynamic relevance of stenoses even as compared with biplane angiography. The correlation between severity of narrowing assessed by diameter measurements in the biplane angiography and 2-dimensional magnetic resonance imaging was r = 0.94, and multiplanar reformation with 2-dimensional magnetic resonance imaging was r = 0.87 with a tendency of higher grading with the 3-dimensional technique (p = 0.0001). The correlation of 2-dimensional magnetic resonance imaging with invasively measured hemodynamic gradients was r = 0.67 versus r = 0.74 for the areas assessed by multiplanar reformation, indicating that the hemodynamic relevance of a morphological approach to evaluate the degree of a stenosis should better be assessed 3-dimensionally. Conclusions: The 3-dimensional reconstruction of the morphologic severity of coarctation offers additonal information over conventional imaging especially in patients with kinking, complex geometry, or collaterals,in whom hemodynamic measurements can become unreliable.

Kalibrasi Multikamera Sebagai Acuan Perhitungan Rekonstruksi Pose Objek Virtual pada Seni Animasi Tiga Dimensi

2013 ◽  
Author(s):  
Samuel Gandang Gunanto
Keyword(s):  
Calibration Error ◽  
Animation Industry ◽  
3 Dimensional ◽  
Initial Stage ◽  
Error Factor ◽  
Dimensional Reconstruction ◽  
Long Time ◽  
Computer Vision Technology ◽  
The Right ◽  
Visual Results

The development of computer vision technology has penetrated in the field ofanimation and game art. Production time which generally takes a long time can be shortened significantly so that the animation industry productivity increases. But the existence of this technology is still very rarely used because of the expensive equipment and at least a man who mastered. This research is intended as an initial stage of looking for an alternative design of this technology. A good camera calibration will be a key reference for the right model of 3-dimensional reconstruction poses. Calibration error factor in pixels reprojection in this research is still good, 0.12. Visual results in 3-dimensional reconstruction of the cube as a result of exposure to the performance of this system is also still looks good, although shifting as much as 4.54 cm due to the extraction point.

Lateralized Tinnitus Studied With Functional Magnetic Resonance Imaging: Abnormal Inferior Colliculus Activation

2000 ◽  
Vol 83 (2) ◽  
pp. 1058-1072 ◽  
Author(s):  
J. R. Melcher ◽  
I. S. Sigalovsky ◽  
J. J. Guinan ◽  
R. A. Levine
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Functional Magnetic Resonance Imaging ◽  
Inferior Colliculus ◽  
Functional Magnetic Resonance ◽  
Resonance Imaging ◽  
Sound Stimulation ◽  
Percent Signal Change ◽  
Signal Change ◽  
The Right

Tinnitus, the perception of sound in the absence of external stimuli, is a common and often disturbing symptom that is not understood physiologically. This paper presents an approach for using functional magnetic resonance imaging (fMRI) to investigate the physiology of tinnitus and demonstrates that the approach is effective in revealing tinnitus-related abnormalities in brain function. Our approach as applied here included 1) using a masking noise stimulus to change tinnitus loudness and examining the inferior colliculus (IC) for corresponding changes in activity, 2) separately considering subpopulations with particular tinnitus characteristics, in this case tinnitus lateralized to one ear, 3) controlling for intersubject differences in hearing loss by considering only subjects with normal or near-normal audiograms, and 4) tailoring the experimental design to the characteristics of the tinnitus subpopulation under study. For lateralized tinnitus subjects, we hypothesized that sound-evoked activation would be abnormally asymmetric because of the asymmetry of the tinnitus percept. This was tested using two reference groups for comparison: nontinnitus subjects and nonlateralized tinnitus subjects. Binaural noise produced abnormally asymmetric IC activation in every lateralized tinnitus subject ( n = 4). In reference subjects ( n = 9), activation (i.e., percent change in image signal) in the right versus left IC did not differ significantly. Compared with reference subjects, lateralized tinnitus subjects showed abnormally low percent signal change in the IC contralateral, but not ipsilateral, to the tinnitus percept. Consequently, activation asymmetry (i.e., the ratio of percent signal change in the IC ipsilateral versus contralateral to the tinnitus percept) was significantly greater in lateralized tinnitus subjects as compared with reference subjects. Monaural noise also produced abnormally asymmetric IC activation in lateralized tinnitus subjects. Two possible models are presented to explain why IC activation was abnormally low contralateral to the tinnitus percept in lateralized tinnitus subjects. Both assume that the percept is associated with abnormally high (“tinnitus-related”) neural activity in the contralateral IC. Additionally, they assume that either 1) additional activity evoked by sound was limited by saturation or 2) sound stimulation reduced the level of tinnitus-related activity as it reduced the loudness of (i.e., masked) the tinnitus percept. In summary, this work demonstrates that fMRI can provide objective measures of lateralized tinnitus and tinnitus-related activation can be interpreted at a neural level.

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