scholarly journals CT-like MRI using the zero-TE technique for osseous changes of the TMJ

2020 ◽  
Vol 49 (3) ◽  
pp. 20190272 ◽  
Author(s):  
Chena Lee ◽  
Kug Jin Jeon ◽  
Sang-Sun Han ◽  
Young Hyun Kim ◽  
Yoon Joo Choi ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Proton Density ◽  
Bone Pathology ◽  
Perfect Agreement ◽  
Mandibular Fossa ◽  
Bone Changes ◽  
Osseous Changes ◽  
3.0 T ◽  
Bone Assessment ◽  
Κ Statistic

Objective: This study was conducted to assess the clinical usability of the zero-echo time (ZTE) technique of MRI for evaluating bone changes of the temporomandibular joint (TMJ) in comparison with CBCT. Methods: Twenty patients with TMJ disorder who underwent both CBCT and MRI were randomly selected. CBCT images were obtained with an Alphard 3030 device (Asahi Roentgen Ind., Co. Ltd, Kyoto, Japan). MRIs were obtained using a 3.0 T scanner (Pioneer; GE Healthcare, Waukesha, WI, USA) and a 21-channel head coil. An isotropic three-dimensional proton-density-weighted ZTE sequence was acquired. Two radiologists evaluated 40 joints of 20 patients for the presence of the following osseous changes: flattening, erosion, osteophyte and sclerosis of the condyle; and flattening, erosion and sclerosis of the articular fossa. CBCT and ZTE-MRI assessments were performed at a 2-month interval. The prevalence-adjusted and bias-adjusted κ statistic was used to analyse interexaminer and intraexaminer agreement and the agreement between ZTE-MRI and CBCT. Results: Intraexaminer and interexaminer agreement analyses of ZTE-MRI showed high reproducibility (κ>0.80), which was comparable to that of CBCT. Flattening, osteophyte and sclerosis of the condyle and all types of bone changes in the mandibular fossa showed nearly perfect agreement between CBCT and ZTE-MRI (κ = 0.80–0.90). Erosion of the condyle showed substantial agreement between both sets of images (κ = 0.65–0.70). Conclusions: It is suggested that ZTE-MRI provides clinically reliable images for bone assessment in TMJ disorder. MRI may become a beneficial diagnostic tool for patients with both TMJ disc and bone pathology, with advantages involving medical costs and radiation dose.

A comparison between the CS-TOF and the CTA/DSA for WEB device management

2021 ◽  
pp. 159101992110147
Author(s):  
Oktay Algin ◽  
Gokhan Yuce ◽  
Ural Koc ◽  
Gıyas Ayberk
Keyword(s):  
Mr Angiography ◽  
Three Dimensional ◽  
Morphological Parameters ◽  
Perfect Agreement ◽  
Device Management ◽  
Web Device ◽  
Sensing Time ◽  
The Web

Purpose There is no study on the role of three-dimensional compressed sensing time of flight MR angiography (3D-CS-TOF) in the management of the WEB device. We evaluated the efficacy of 3-tesla 3D-CS-TOF for the management and follow-up of the WEB device implantations. Materials and methods Seventy-three aneurysms of 69 patients treated with the WEB device were retrospectively examined. Morphological parameters and embolization results of the aneurysms were assessed and compared on 3D-CS-TOF, CTA, and DSA images. Results Occluded, neck remnant, and recurrent aneurysms were observed in 61 (83.6%), 7 (9.6%), and 5 (6.8%) aneurysms, respectively. Inter- and intra-reader agreement values related to aneurysm size measurements were perfect. Aneurysms size, age, and proximal vessel tortuosity were negatively correlated with the visibility of the aneurysms and parent vessels on 3D-CS-TOF images (p = 0.043; p = 0.032; p < 0.001, respectively). Subarachnoid hemorrhage and age are associated with 3D-CS-TOF artifacts (p = 0.031; p = 0.005, respectively). 3D-CS-TOF findings are in perfect agreement with DSA or CT angiography (CTA) results (p < 0.001). Conclusion According to our results, 3D-CS-TOF can be an easy, fast, and reliable alternative for the management or follow-up of WEB assisted embolization.

scholarly journals Superconformal boundaries in 4 − ϵ dimensions

2021 ◽  
Vol 2021 (4) ◽  
Author(s):  
Aleix Gimenez-Grau ◽  
Pedro Liendo ◽  
Philine van Vliet
Keyword(s):  
Three Dimensional ◽  
Spacetime Dimension ◽  
Perfect Agreement ◽  
Bootstrap Analysis ◽  
First Order ◽  
Free Theory ◽  
First Order Correction ◽  
Free Parameters ◽  
Superconformal Theories ◽  
Zumino Model

Abstract Boundaries in three-dimensional $$ \mathcal{N} $$ N = 2 superconformal theories may preserve one half of the original bulk supersymmetry. There are two possibilities which are characterized by the chirality of the leftover supercharges. Depending on the choice, the remaining 2d boundary algebra exhibits $$ \mathcal{N} $$ N = (0, 2) or $$ \mathcal{N} $$ N = (1) supersymmetry. In this work we focus on correlation functions of chiral fields for both types of supersymmetric boundaries. We study a host of correlators using superspace techniques and calculate superconformal blocks for two- and three-point functions. For $$ \mathcal{N} $$ N = (1) supersymmetry, some of our results can be analytically continued in the spacetime dimension while keeping the codimension fixed. This opens the door for a bootstrap analysis of the ϵ-expansion in supersymmetric BCFTs. Armed with our analytically-continued superblocks, we prove that in the free theory limit two-point functions of chiral (and antichiral) fields are unique. The first order correction, which already describes interactions, is universal up to two free parameters. As a check of our analysis, we study the Wess-Zumino model with a super-symmetric boundary using Feynman diagrams, and find perfect agreement between the perturbative and bootstrap results.

The pineal volume: a three‐dimensional volumetric study in healthy young adults using 3.0 T MR data

2009 ◽  
Vol 27 (7) ◽  
pp. 655-660 ◽  
Author(s):  
Bo Sun ◽  
Dan Wang ◽  
Yuchun Tang ◽  
Lingzhong Fan ◽  
Xiangtao Lin ◽  
...  
Keyword(s):  
Young Adults ◽  
Three Dimensional ◽  
Volumetric Study ◽  
3.0 T

scholarly journals Intrarater and interrater reliability of the pediatric arteriovenous malformation compactness score in children

2013 ◽  
Vol 11 (5) ◽  
pp. 547-551 ◽  
Author(s):  
Fabio A. Frisoli ◽  
Shih-Shan Lang ◽  
Arastoo Vossough ◽  
Anne Marie Cahill ◽  
Gregory G. Heuer ◽  
...  
Keyword(s):  
Arteriovenous Malformation ◽  
Recurrence Rate ◽  
Arteriovenous Malformations ◽  
Interrater Reliability ◽  
Intrarater Reliability ◽  
Cerebral Arteriovenous Malformations ◽  
Perfect Agreement ◽  
Interventional Radiologist ◽  
Κ Statistic

Object Cerebral arteriovenous malformations (AVMs) have a higher postresection recurrence rate in children than in adults. The authors' previous study demonstrated that a diffuse AVM (low compactness score) predicts postresection recurrence. The aims of this study were to evaluate the intra- and interrater reliability of the AVM compactness score. Methods Angiograms of 24 patients assigned a preoperative compactness score (scale of 1–3; 1 = most diffuse, 3 = most compact) in the authors' previous study were rerated by the same pediatric neuroradiologist 9 months later. A pediatric neurosurgeon, pediatric neuroradiology fellow, and interventional radiologist blinded to each other's ratings, the original ratings, and AVM recurrence also rated each AVM's compactness. Intrarater and interrater reliability were calculated using the κ statistic. Results Of the 24 AVMs, scores by the original neuroradiologist were 1 in 6 patients, 2 in 16 patients, and 3 in 2 patients. Intrarater reliability was 1.0. The κ statistic among the 4 raters was 0.69 (95% CI 0.44–0.89), which indicates substantial reliability. The interrater reliability between the neuroradiologist and neuroradiology fellow was moderate (κ = 0.59 [95%CI 0.20–0.89]) and was substantial between the neuroradiologist and neurosurgeon (κ = 0.74 [95% CI 0.41–1.0]). The neuroradiologist and interventional radiologist had perfect agreement (κ = 1.0). Conclusions Intrarater and interrater reliability of the AVM compactness score were excellent and substantial, respectively. These results demonstrate that the AVM compactness score is reproducible. However, the neuroradiologist and interventional radiologist had perfect agreement, which indicates that the compactness score is applied most accurately by those with extensive angiography experience.

Analysis of ascending spinal tract degeneration in cervical spondylotic myelopathy using 3D anisotropy contrast single-shot echo planar imaging on a 3.0-T system

2011 ◽  
Vol 15 (6) ◽  
pp. 648-653 ◽  
Author(s):  
Takaaki Urakawa ◽  
Hitoshi Matsuzawa ◽  
Yuji Suzuki ◽  
Naoto Endo ◽  
Ingrid L. Kwee ◽  
...  
Keyword(s):  
Fractional Anisotropy ◽  
Cervical Spondylotic Myelopathy ◽  
Imaging System ◽  
Three Dimensional ◽  
Cord Compression ◽  
Cervical Cord ◽  
Single Shot ◽  
Planar Imaging ◽  
Contrast Imaging ◽  
3.0 T

Object The authors assessed the role of 3D anisotropy contrast (3DAC) in evaluating specific ascending tract degeneration in patients with cervical spondylotic myelopathy (CSM). Methods The authors studied 10 patients (2 women, 8 men; mean age 59.8 ± 14.6 years) with CSM and spinal cord compression below the C2–3 disc level, as well as 10 healthy control individuals (3 women, 7 men; mean age 42.0 ± 24.1 years). Images of the cervical cord at the C2–3 level were obtained using a 3.0-T MR imaging system. Results Three-dimensional anisotropy contrast imaging clearly made possible tract-by-tract analysis of the fasciculus cuneatus, fasciculus gracilis, and spinocerebellar tract. Tract degeneration identified using 3DAC showed good correlation with a decline in fractional anisotropy. Degeneration of the fasciculus gracilis detected by “vector contrast” demonstrated a good correlation with Nurick grades. Conclusions The study unambiguously demonstrated that 3DAC imaging is capable of assessing ascending tract degeneration in patients with CSM. Degeneration of an individual tract can be easily identified as a vector contrast change on the 3DAC image, a reflection of quantitative changes in anisotropism, similar to fractional anisotropy. Excellent correlation between Nurick grades and fasciculus gracilis degeneration suggests potential application of 3DAC imaging for tract-by-tract clinical correlation.

Articular Cartilage of the Knee: Rapid Three-dimensional MR Imaging at 3.0 T with IDEAL Balanced Steady-State Free Precession—Initial Experience

Radiology ◽  
2006 ◽  
Vol 240 (2) ◽  
pp. 546-551 ◽  
Author(s):  
Garry E. Gold ◽  
Scott B. Reeder ◽  
Huanzhou Yu ◽  
Peter Kornaat ◽  
Ann S. Shimakawa ◽  
...  
Keyword(s):  
Steady State ◽  
Articular Cartilage ◽  
Mr Imaging ◽  
Steady State Free Precession ◽  
Three Dimensional ◽  
Initial Experience ◽  
Free Precession ◽  
3.0 T

scholarly journals Test-retest reliability of smile tasks using three-dimensional facial topography

2018 ◽  
Vol 88 (3) ◽  
pp. 319-328 ◽  
Author(s):  
Chihiro Tanikawa ◽  
Kenji Takada
Keyword(s):  
Facial Expression ◽  
Repeated Measures ◽  
Three Dimensional ◽  
Wire Mesh ◽  
Minimal Detectable Change ◽  
Perfect Agreement ◽  
Retest Reliability ◽  
Maximum Effort ◽  
Test Retest Reliability ◽  
Rest Posture

ABSTRACT Objectives: To evaluate the test-retest reliability of three types of facial expression tasks using three-dimensional (3D) facial topography. Materials and Methods: Twelve adult volunteers were enrolled in this study. They were instructed to perform three different facial expression tasks: rest posture, posed smile, and maximum effort smile. Each task was recorded using a 3D image-capturing device on two separate occasions with an interval of 1 week between sessions. The images of two sessions were superimposed based on the forehead. For each participant and for each facial expression, a wire mesh fitting was conducted. This method generated 6,017 points on the wire mesh. Intraindividual reliability between sessions for each task was statistically tested by intraclass correlation coefficients (ICCs) and the 95% confidence interval minimal detectable change (MDC95). Results: The MDC95 for the repeated measures of the rest posture, posed smile, and maximum effort smile exhibited means of 0.8, 1.5, and 1.3 mm, respectively, on the z-axis. The ICCs ranged from substantial to almost perfect agreement for repeated measures for the rest posture and maximum effort smile (0.60 &lt; ICC ≤ 1.00). The right corner of the mouth in the posed smile showed moderate agreement (0.40 &lt; ICC ≤ 0.60). Conclusions: The overall test-retest reliability of the maximum effort smile and rest posture showed substantial to almost perfect agreement, and this was clinically acceptable.

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