A simple graded bite block for dynamic magnetic resonance imaging of the temporomandibular joint

2021 ◽  
pp. 20210119
Author(s):  
Kazimierz Szopinski ◽  
Piotr A. Regulski
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Temporomandibular Joint ◽  
Dynamic Assessment ◽  
Dynamic Mri ◽  
Resonance Imaging ◽  
Bite Block ◽  
Mri Scans ◽  
Magnetic Resonance Imaging Mri ◽  
Lower Incisors

Objectives: New solutions for the dynamic assessment of the moving structures of the temporomandibular joint (TMJ), such as the intra-articular disc and the head of the mandible, are required for magnetic resonance imaging (MRI). Therefore, we propose a simple, graded bite block for dynamic MRI examination of the TMJ. Methods: The bite block consists of three main functional elements: a groove for the biting edges of the upper incisors, steps with bite surfaces for the biting edges of the lower incisors and a handle for easy placement and control of the device. The block is easily manufactured using commercially available 3D printers. The closed-mouth part of the study was performed without the bite block. The patient was instructed to place the central incisors’ biting edges in the upper groove. The lower incisors’ biting edges were placed consecutively on the first step, second step, and so on, in increasing order, until maximal opening was reached. Results: Ninety-five MR examinations of TMJs were performed. The graded opening bite block was successfully applied in all but two patients. Conclusions: In conclusion, the simple and easy-to-use graded bite block may be a useful addition to the armamentarium of a radiologist performing MRI scans of the TMJ.

scholarly journals Magnetic resonance imaging (MRI) scans in patients with dorsal root ganglion stimulation

Pain Practice ◽  
2021 ◽  
Author(s):  
Marco Reining ◽  
Dirk Winkler ◽  
Joachim Boettcher ◽  
Juergen Meixensberger ◽  
Michael Kretzschmar
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Dorsal Root Ganglion ◽  
Dorsal Root ◽  
Resonance Imaging ◽  
Mri Scans ◽  
Magnetic Resonance Imaging Mri

scholarly journals Occlusal stabilization appliance: evaluation of its efficacy in the treatment of temporomandibular disorders

2004 ◽  
Vol 12 (3) ◽  
pp. 238-243 ◽  
Author(s):  
Elisa Emi Tanaka ◽  
Emiko Saito Arita ◽  
Bunji Shibayama
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Temporomandibular Joint ◽  
Temporomandibular Disorders ◽  
Imaging Modality ◽  
Clinical Status ◽  
Signs And Symptoms ◽  
Resonance Imaging ◽  
Magnetic Resonance Imaging Mri ◽  
Mri Evaluation

Occlusal stabilization appliances or splints are the most widely employed method for treatment of temporomandibular disorders (TMD). Magnetic Resonance Imaging (MRI) is the most indicated imaging modality to evaluate the components of the temporomandibular joint (TMJ). Forty patients with signs and symptoms of temporomandibular disorders were treated with splints for a mean period of 12 months, comprising regular semimonthly follow-ups. After stabilization of the clinical status, occlusal adjustments and MRI evaluation were performed. It was concluded that the success of this kind of treatment are related to the total (70%) or partial improvement (22.5%) of painful symptomatology and to the functional reestablishment of the craniomandibular complex. The MRI allowed evaluation and also the conclusion that the splints provide conditions for the organism to develop means to resist to the temporomandibular disorders by means of elimination of several etiologic factors. Moreover, after treatment the patients are able to cope with disc displacements with larger or smaller tolerance.

Safety Issues in Magnetic Resonance Imaging Scan with Retention of Olympus Long Clips in the Gastrointestinal Tract

2021 ◽  
Vol 17 ◽  
Author(s):  
Cheng-Yi Wang ◽  
Wei-Chou Chang ◽  
Hsin-Hung Huang ◽  
Wei-Kuo Chang ◽  
Yu-Lueng Shih ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Magnetic Resonance Imaging Scan ◽  
Resonance Imaging ◽  
Endoscopic Clip ◽  
Serious Adverse Event ◽  
Safety Issues ◽  
Endoscopic Clips ◽  
Mri Scans ◽  
Magnetic Resonance Imaging Mri

Objective: Not all endoscopic clips are compatible with magnetic resonance imaging (MRI). The aim of this study is to investigate the safety of MRI-incompatible endoscopic clips in patients undergoing MRI scans. Methods: We retrospectively reviewed the medical records of patients who had received endoscopic clip placement of Olympus Long Clip MRI-incompatible clips and then had undergone MRI scans within two weeks in our hospital between 2014 and 2019. Results: A total of 44,292 patients had undergone an MRI examination at our hospital. Only 15 patients had MRI scans within two weeks after the endoscopic clip placement. Their median age was 65.5 years, and 12 of the 15 patients were men. At the time of the clip placement and MRI scan, four patients were taking anti-coagulation or anti-platelet agents. The indication for endoscopic clip placement of the 15 patients was mucosal/submucosal defect or hemorrhage and colonic perforation. Endoscopic clips were placed in the colon of 14 patients and in the stomach of only one patient for gastric hemorrhage. One patient experienced clip migration and three displayed artifacts in abdominal images. No patient complications of mortality, hemorrhage, or organ perforation occurred. Conclusion: No serious adverse event occurred during MRI scans of patients with MRI-incompatible clips in this study, suggesting that MRI-incompatible clips may be safe to use in MRI scans. However, this does not guarantee the safety of the Long Clip for MRI scans, as further tests are needed to verify that this clip is safe for use during MRI.

Magnetic Resonance Imaging to Investigate the Clinical Applicability of the Medial Femoral Trochlea Osteochondral Flap Within the Wrist

Hand ◽  
2022 ◽  
pp. 155894472110643
Author(s):  
Jimmy H. Daruwalla ◽  
Jan Skrok ◽  
Mitchell A. Pet ◽  
Aviram M. Giladi ◽  
James P. Higgins
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Sagittal Plane ◽  
Convex Surface ◽  
Radius Of Curvature ◽  
Resonance Imaging ◽  
Femoral Trochlea ◽  
Average Ratio ◽  
Mri Scans ◽  
Magnetic Resonance Imaging Mri

Background: The medial femoral trochlea (MFT) osteochondral flap is employed for reconstruction of unsalvageable scaphoid proximal pole nonunions. The convex surface of the cartilage-bearing proximal trochlea is used to replace the similarly contoured proximal scaphoid and articulate with the concave scaphoid fossa of the radius. A magnetic resonance imaging (MRI) comparison of the shape of the MFT as it relates to the native proximal scaphoid has not been previously performed. Our study aimed to quantifiably compare the shape of the MFT, proximal scaphoid, and scaphoid fossa. Methods: Using imaging processing software, we measured radius of curvature of the articular segments in MRI scans of 10 healthy subjects’ wrists and knees. Results: Compared with the scaphoid fossa, average ratio of the radius of circumference of the proximal scaphoid was 0.79 and 0.78 in the coronal and sagittal planes, respectively. Compared with the scaphoid fossa, average ratio of the radius of circumference of the MFT was 0.98 and 1.31 in the coronal and sagittal planes, respectively. The radius of curvature of the MFT was larger than the proximal scaphoid, in the coronal and sagittal planes. In the coronal plane, the MFT radius of curvature is nearly identical to the scaphoid fossa, a closer match than the scaphoid itself. In the sagittal plane, the radius of curvature of the MFT was larger than the radius of curvature of the scaphoid fossa. Conclusions: Our data suggest that the radius of curvature, in the sagittal and coronal planes, of the MFT and proximal scaphoid is disparate.

scholarly journals Sensitivity of Magnetic Resonance Imaging in the Detection of Colorectal Liver Metastases

2008 ◽  
Vol 90 (1) ◽  
pp. 25-28 ◽  
Author(s):  
S Blyth ◽  
A Blakeborough ◽  
M Peterson ◽  
IC Cameron ◽  
AW Majeed
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Liver Metastases ◽  
Colorectal Liver Metastases ◽  
Imaging Modality ◽  
Invasive Technique ◽  
Resonance Imaging ◽  
Mri Scans ◽  
Magnetic Resonance Imaging Mri ◽  
High Degree

INTRODUCTION The aim of this study was to evaluate the sensitivity of magnetic resonance imaging (MRI) in the detection of colorectal liver metastases. PATIENTS AND METHODS Pre-operative MRI scanning of the liver was performed by a single radiologist and the size and number of definite liver metastases were recorded. Patients then underwent hepatectomy with routine intra-operative ultrasonography (IOUS) and resected specimens were sent for histopathology. Pathology findings were compared with those of MRI scans to determine the sensitivity of this imaging modality. Exclusions were patients undergoing hepatic resection more than 4 weeks after the MRI scan, those undergoing chemotherapy at the time of the scan, and those with conglomerate unilobar metastases. RESULTS Complete data were available for 84 patients. There was total agreement between MRI, IOUS and histology in 79 patients (101 metastases). MRI missed 5 metastases in 5 patients that were found on IOUS (or palpation of superficial lesions) and subsequently confirmed by histological examination. These measured 5 mm or less (4 patients) and 7 mm (one patient). The sensitivity of MRI in the detection of colorectal liver metastases was thus 94% for all lesions and 100% for lesions 1 cm or larger in diameter. CONCLUSIONS MRI of the liver is a non-invasive technique with an extremely high degree of sensitivity in the detection of colorectal liver metastases and should be considered as the ‘gold standard’ in the pre-operative imaging of these patients.

“Moustache” Appearance in Craniopharyngiomas: Unique Magnetic Resonance Imaging and Computed Tomographic Findings of Perifocal Edema

Neurosurgery ◽  
1990 ◽  
Vol 27 (6) ◽  
pp. 993-996 ◽  
Author(s):  
Sotaro Higashi ◽  
Junkoh Yamashita ◽  
Hirosuke Fujisawa ◽  
Yuuichi Yamamoto ◽  
Masumi Kadoya
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Intraventricular Tumor ◽  
Resonance Imaging ◽  
Computed Tomographic ◽  
Perifocal Edema ◽  
Mri Scans ◽  
Magnetic Resonance Imaging Mri ◽  
Operative Findings ◽  
Protein Rich

Abstract This report describes two cases of craniopharyngioma with perifocal edema. In both patients, computed tomography and magnetic resonance imaging (MRI) revealed that the tumors occupied the suprasellar cistern, invaginated the floor of the 3rd ventricle and were tightly adherent to the ventricular walls. The intraventricular portions of the tumors were cystic, containing protein-rich fluid as suggested by MRI and confirmed by operative findings. There was perifocal edema in the hypothalamus adjacent to the intraventricular tumor, the optic tracts, and the posterior limbs of the internal capsules, resembling the shape of a moustache on axial computed tomographic and MRI scans. The perifocal edema subsided after treatment of the intraventricular tumor by surgical resection or radiation therapy. The “moustache” appearance seems a unique, characteristic feature of perifocal edema, which is observed infrequently with certain craniopharyngiomas.

Nail Disease in Psoriatic Arthritis: Distal Phalangeal Bone Edema Detected by Magnetic Resonance Imaging Predicts Development of Onycholysis and Hyperkeratosis

2012 ◽  
Vol 39 (4) ◽  
pp. 841-843 ◽  
Author(s):  
NICOLA DALBETH ◽  
KAREN PUI ◽  
MARIA LOBO ◽  
ANTHONY DOYLE ◽  
PETER B. JONES ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Psoriatic Arthritis ◽  
Magnetic Resonance ◽  
Bone Erosion ◽  
Resonance Imaging ◽  
Mri Features ◽  
Bone Edema ◽  
Mri Scans ◽  
Magnetic Resonance Imaging Mri ◽  
Nail Disease

Objective.To examine the association between magnetic resonance imaging (MRI) features of distal phalanx (DP) disease and the progression of nail pathology in psoriatic arthritis (PsA).Methods.Clinical nail assessment and hand MRI scans were done on 34 patients with PsA. Twenty patients had repeat nail assessments after 1 year.Results.Nails with onycholysis and hyperkeratosis at baseline were more likely to have corresponding DP bone erosion and proliferation on MRI. DP bone edema on baseline MRI was associated with development of onycholysis and hyperkeratosis in corresponding nails.Conclusion.Our data suggest that DP inflammation is central in the development of psoriatic nail disease.

Computed Tomography and Magnetic Resonance Imaging of Cervical Metastasis

1989 ◽  
Vol 101 (4) ◽  
pp. 422-425 ◽  
Author(s):  
Daniel D. Lydiatt ◽  
Rodney S. Markin ◽  
Susan M. Williams ◽  
Leon F. Davis ◽  
Anthony J. Yonkers
Keyword(s):  
Magnetic Resonance Imaging ◽  
Computed Tomography ◽  
Magnetic Resonance ◽  
Head And Neck ◽  
Clinical Examination ◽  
Radical Neck Dissection ◽  
Resonance Imaging ◽  
Primary Tumors ◽  
Mri Scans ◽  
Magnetic Resonance Imaging Mri

Thirteen patients with head and neck cancer underwent staging by clinical examination, computed tomography (CT), and magnetic resonance imaging (MRI) in a standardized blinded fashion. All patients subsequently underwent radical neck dissection with subsequent pathologic staging. CT and MRI each predicted 93% of staging results correctly, with clinical examination correct 67% of the time. Staging of primary tumors had an accuracy of 90% by clinical examination, 40% by CT, and 50% by MRI when compared to staging of the pathologic specimen. Understaging was seen in 50% of CT scans and 30% of MRI scans. We believe either CT or MRI should be considered for routine staging of the neck in all head and neck malignancies.

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