Estudo comparativo entre duas técnicas radiográficas transcranianas para estudo da ATM

Marcus Vinicius Linhares de Oliveira; Paulo Sergio Flores Campos

doi:10.9771/cmbio.v11i2.6683

Estudo comparativo entre duas técnicas radiográficas transcranianas para estudo da ATM

Revista de Ciências Médicas e Biológicas ◽

10.9771/cmbio.v11i2.6683 ◽

2012 ◽

Vol 11 (2) ◽

pp. 189

Author(s):

Marcus Vinicius Linhares de Oliveira ◽

Paulo Sergio Flores Campos

Keyword(s):

Image Quality ◽

Anatomical Structure ◽

Glenoid Fossa ◽

Font Size ◽

Anatomical Structures ◽

Mandibular Joint ◽

Radiographic Interpretation ◽

Exposure Methods ◽

Pathological Assessment

Introdução: Estudos através das imagens da ATM apresentam-se como auxílio ao diagnóstico especifico de determinadas patologias relacionadas a essa estrutura anatômica. De modo a oferecer mais informações possíveis, visualização mais clara, redução das dificuldades de interpretação radiográfica, é imperativa a boa execução das técnicas radiográficas e o desenvolvimento de novos métodos de exposição. Objetivo: Avaliar duas incidências radiográficas convencionais que possibilitam o estudo da ATM e relacioná-las com a qualidade da imagem, de acordo com a visualização das estruturas anatômicas. Materiais e métodos : O estudo foi realizado através da execução de duas técnicas radiográficas (SCHULLER e LAW modificado), utilizadas para estudo da ATM em um simulador com ossos do crânio e mandíbula humana recoberta com resina. A qualidade da imagem foi avaliada por três radiologistas com experiência, que atribuíram escores (01 – inadequado; 02 – aceitável com restrições; 03 – aceitável sem restrições) relacionados à sobreposição das estruturas, à visualização da fossa mandibular e à definição do côndilo. Resultados: Para os três avaliadores, a técnica B apresentou a concordância em 75% dos pontos analisados, observou-se que para a técnica A os avaliadores 1 e 3 concordaram em 75%, enquanto que os indicies kappa foram considerados moderados para a técnica B . Conclusão: As técnicas transcranianas permitem a avaliação anatômica e patológica da ATM como forma simples e mais acessível ao paciente sendo a técnica de Law modificado a que apresenta maior concordância entre os avaliadores. Abstract Introduction: Image studies of the temporal mandibular joint (TMJ) are presented as an assistance to the diagnosis of certain specific pathologies related to this anatomical structure. In order to provide as much information as possible, a clearer view and a reduction in the difficulty of the radiographic interpretation it is imperative a good performance of the radiographic techniques and the development of new exposure methods. Objective: Evaluate two conventional radiographic views that allow the study of TMJ and relate them with the image quality according to the visualization of anatomical structures Materials and Methods: The study was conducted by running two radiographic techniques (SCHULLER and modified LAW) used to the TMJ study in a phantom containing cranial bones and a human mandibular covered with resin. The image quality was evaluated by three experienced radiologists assigning scores (01 - inappropriate, 02 - acceptable with restrictions, 03-acceptable without restrictions) related to overlapping structures, visualization of the glenoid fossa and condyle definition. Results: For three evaluators, B technique presented an agreement on 75% of the points analyzed. It was observed that for technique A, evaluators 1 and 3 evaluators agreed on 75% while the kappa indexwere considered moderated for B technique. Conclusion: Transcranial techniques allow anatomical and pathological assessment of the TMJ in a simple and more accessible way to the patient and the technique of modified Law presents the best agreement between raters.

Preliminary Qualitative Evaluation of the Anatomical Structures for Vocalization in the Chicken (Gallus gallus domestica)

Journal of Veterinary and Biomedical Sciences ◽

10.36108/jvbs/1202.30.0130 ◽

2021 ◽

Vol 3 (1) ◽

pp. 13-18

Author(s):

J. C. Shawulu

Keyword(s):

Abrupt Change ◽

Qualitative Evaluation ◽

Gallus Gallus ◽

Anatomical Structure ◽

Domestic Chicken ◽

Local Market ◽

Anatomical Structures ◽

Red Jungle Fowl ◽

Males And Females

The anatomical structure of phonation in the domestic chicken Gallus gallus (red jungle fowl, forma domestica) of both sexes was studied to determine sex variations in structures. Ten (10) birds, involving 5 males and 5 females were obtained from a local market for student demonstrations and used for this study. Tracheal rings were observed to be made of circular cartilages numbering thirty and above with the distal most (1/5) tracheal rings narrowed, calcified and fused as the tympanum making part of the Syrinx. The rings become calcified and somewhat collapsed through the bronchial bifurcations. When squeezed, the trachea collapsed completely between fingers but could at releasing the fingers be raised up due to elastic components separating the rings from one another. Other structures involved in vocalization includes straps of muscles. Male structures involved in respiration and vocalization were well formed compared to those of the female. Both tracheobronchialis lateralis and ventralis muscles were thicker than those of the female. Male tracheobronchialis ventralis and dorsalis muscles were well formed and spindle shaped. However, the female tracheobronchialis muscles were seen to be wider compared to the male. The vocal organs (voice box) were seen to be arbitrarily triangular in structure at the bifurcation of the trachea in both sexes. The male Syringeal walls were thinner and were seen to have marked inter Pessula space. The Pessulus mark an abrupt change from the circular trachea to strongly elliptical entrances to the bronchi. It was concluded that the differences in the thinness of syringeal walls coupled with differences between the males and females in other tracheal muscles might be responsible for the stronger vocalization in the male.

Relationship between CNR and visibility of anatomical structures of cone-beam computed tomography images under different exposure parameters

Dentomaxillofacial Radiology ◽

10.1259/dmfr.20190336 ◽

2020 ◽

Vol 49 (5) ◽

pp. 20190336

Author(s):

Miss Fei Wang ◽

Xiaoyan Xie ◽

Gang Li ◽

Zuyan Zhang

Keyword(s):

Image Quality ◽

Change Point ◽

Cone Beam Ct ◽

Cone Beam ◽

Physical Factors ◽

Anatomical Structures ◽

Subjective Image Quality ◽

Computed Tomography Images ◽

Tissue Equivalent ◽

Imagej Software

Objectives: The purpose of this study was to investigate the image quality of cone beam CT (CBCT) under different exposure parameters and the relationship between contrast-to-noise and visibility of eight anatomical structures. Methods: CBCT images for the evaluation of subjective image quality were acquired on an anthropopathic phantom containing a human skeleton embedded in soft tissue equivalent materials using 25 exposure protocols. Visibility of eight anatomical structures was evaluated by five independent observers. Using the SEDENTEXCT IQ Image Quality phantom, the contrast-to-noise ratio (CNR) was calculated by ImageJ software. Results: A reduction on the visibility of anatomical structures was seen under lower exposure parameters. However, for 84% of the protocols, visibility of anatomical structures remained acceptable even under some lower parameter settings. As CNR increased, the visibility of anatomical structures also increased correspondingly. A change point could be found in the CNR interval 29.42–36.51 after which the visibility of anatomical structures no longer increases with the increase of CNR. Conclusions: Although CNR decrease under a lower exposure parameter, the image quality often remained acceptable at exposure levels below the manufacture’s recommended settings. It is possible to standardize subjective image quality by physical factors. Currently, it is not possible to predetermine a change point CNR value due to different CBCT machine and variation of diagnostic tasks.

Use of artisanal simulators in the ultrasound training for invasive procedures in nephrology: venous access and renal biopsy

Brazilian Journal of Nephrology ◽

10.1590/2175-8239-jbn-2018-0211 ◽

2019 ◽

Vol 41 (3) ◽

pp. 423-426

Author(s):

Marcus Gomes Bastos ◽

Ramon de Oliveira Dalamura ◽

Ana Luisa Silveira Vieira ◽

José Pazeli Jr.

Keyword(s):

Image Quality ◽

Renal Biopsy ◽

Low Cost ◽

Venous Access ◽

Chicken Breast ◽

Invasive Procedures ◽

Anatomical Structures ◽

Pig Kidney ◽

Hand Eye Coordination ◽

Biopsy Methods

ABSTRACT Introduction: Vascular access and renal biopsy are common procedures in nephrology. In this study, two artisanal simulators of very low cost and excelent image quality are (prented) presented to guide, by ultrasound, the venous access and renal biopsy. Methods: The simulators are constructed using chicken breast slices, Penrose drain, plastic milk shake straw and pig kidney. Results: Both simulators enable immediate identification of the anatomical structures of interest, vessels and kidney, and enable spatial orientation and hand-eye coordination, essential for the development of the necessary skills to safely carry out invasive procedures. Conclusion: The simulators described, were extremely useful for simulating venous access and renal biopsy guided by ultrasonography, enabling training to reduce the failure rate in punctures and the potential complications associated with the described procedures.

Mandibular joint arthrosis corrected by the insertion of a cast-vitallium glenoid fossa prosthesis: A new technique

Oral Surgery Oral Medicine Oral Pathology ◽

10.1016/0030-4220(64)90522-5 ◽

1964 ◽

Vol 17 (6) ◽

pp. 712-722 ◽

Cited By ~ 17

Author(s):

Robert W. Christensen

Keyword(s):

New Technique ◽

Glenoid Fossa ◽

Mandibular Joint ◽

A New Technique

An investigation on the anatomical structure and relationships of the labyrinth in the reptile, the bird, and the mammal

Proceedings of the Royal Society of London. Series B, Containing Papers of a Biological Character ◽

10.1098/rspb.1908.0045 ◽

1908 ◽

Vol 80 (543) ◽

pp. 507-528 ◽

Cited By ~ 17

Keyword(s):

Round Window ◽

Anatomical Structure ◽

Anatomical Structures ◽

The Subject

The object of this paper is to give a description of the labyrinth of certain animals, illustrating the organ when it is viewed as a whole in examples chosen from the reptiles, birds and mammals. The method of preparation employed was that devised by the writer and described in the “Labyrinth of animals,” vol. 1, p. 8. By the use of this method new facts have been brought to light, and these enable us to elucidate certain relationships in the anatomical structures which have hitherto been obscure and which anatomists are not agreed upon. The structures referred to are, the aqueduct of the perilymph, the perilymph recess and the round window. A special portion of the paper, therefore, has been directed to this aspect of the subject.

Feasibility study of using simultaneous multi-slice RESOLVE diffusion weighted imaging to assess parotid gland tumors: comparison with conventional RESOLVE diffusion weighted imaging

10.21203/rs.3.rs-31321/v1 ◽

2020 ◽

Author(s):

Jia-Suo Jiang ◽

Liu-Ning Zhu ◽

Qian Wu ◽

Yi Sun ◽

Wei Liu ◽

...

Keyword(s):

Image Quality ◽

Parotid Gland ◽

Diffusion Weighted Imaging ◽

Signal To Noise Ratio ◽

Anatomical Structure ◽

Parotid Gland Tumors ◽

Diffusion Weighted ◽

Scan Time ◽

Significant Difference ◽

Noise Ratio

Abstract Background To evaluate the feasibility of using simultaneous multi-slice (SMS) readout segmentation of long variable echo-trains (RESOLVE) diffusion-weighted imaging (DWI) to assess parotid gland tumors, compared with conventional RESOLVE DWI Methods From September 2018 to December 2018, 20 consecutive patients with parotid tumors who underwent MRI scan for pre-surgery evaluation were enrolled. SMS-RESOLVE DWI and conventional RESOLVE DWI were scanned with matched imaging parameters, respectively. The scan time of two DWI sequences was recorded. Qualitative (anatomical structure differentiation, lesion display, artifact, and overall image quality) and quantitative (apparent diffusion coefficient, ADC; ratio of signal-to-noise ratio, SNR ratio; ratio of contrast-to-noise ratio, CNR ratio) assessments of image quality were performed, and compared between SMS-RESOLVE DWI and conventional RESOLVE DWI. Paired t-test was used for statistical analyses. Results The scan time was 3 minutes and 41 seconds for SMS-RESOLVE DWI, and 5 minutes and 46 seconds for conventional RESOLVE DWI. SMS-RESOLVE DWI produced similar qualitative image quality with RESOLVE DWI (anatomical structure differentiation, P = 0.164; lesion display, P = 0.193; artifact, P = 0.330; overall image quality, P = 0.083). Meanwhile, there were no significant difference on ADCLesion (P = 0.298), ADCMasseter (P = 0.122), SNR ratio (P = 0.584) and CNR ratio (P = 0.217) between two DWI sequences. Conclusion Compared with conventional RESOLVE DWI, SMS-RESOLVE DWI could provide comparable image quality using markedly reduced scan time. SMS could increase the clinical usability of RESOLVE technique for DWI of parotid gland.

Method to Determine the Root Canal Anatomic Dimension by using a New Cone-Beam Computed Tomography Software

Brazilian Dental Journal ◽

10.1590/0103-6440201902462 ◽

2019 ◽

Vol 30 (1) ◽

pp. 3-11 ◽

Cited By ~ 4

Author(s):

Mike R Bueno ◽

Cyntia R.A. Estrela ◽

José Mauro Granjeiro ◽

Manoel D. Sousa-Neto ◽

Carlos Estrela

Keyword(s):

Computed Tomography ◽

Root Canal ◽

Anatomical Structure ◽

Intermediate Position ◽

The Other ◽

Cone Beam ◽

Correct Position ◽

Thin Sections ◽

Anatomical Structures ◽

Cbct Image

Abstract This study discusses a method to determine the root canal anatomic dimension by using e-Vol DX software. The methodology consists in initially establishes the correct positions which will be measured, define the point on the edge of the anatomical structure, and next adjust the intermediate position in the grayscale of CBCT image. Afterward, thin sections (0.10 mm) are obtained from 3D reconstructed slices in the filter for the measurements, in order to determine the edge of the anatomical surface in the axial plane. A replication of positions in 3D mode is done in multiplanar reconstruction (MPR) of CBCT images, where the correct position is established with the aid of a positioning guide. The 3D density is adjusted so that it is in the same dimension as the 2D image, and a dimension calibration occurs to the point where there is a coincidence between 3D and 2D. This calibration is done only at the beginning of the measurement. Next, the intermediate position of the division between the grayscale is verified in the CBCT scan. Once one side has been completed, it is moved to the other side and follows the same guidelines described above. When setting the position of the courses in the other margin, being that 2D mode is used as reference. Thus, one obtains the required measure, being checked in the two points. The creation of this filter in the e-Vol DX software for measurement, and its appropriate management, allows more effective applications when it is desired to obtain diameters of anatomical structures.

Construction of Anatomical Structure Specific Developmental Dynamical Networks for Human Brain on multiple Omics Levels

Current Bioinformatics ◽

10.2174/1574893616666210331115659 ◽

2021 ◽

Vol 16 ◽

Author(s):

Yingying Wang ◽

Yu Yang ◽

Jianfeng Liu ◽

Keshen Li

Keyword(s):

Human Brain ◽

Brain Development ◽

Brain Structures ◽

Developmental Time ◽

Anatomical Structure ◽

Dynamical Networks ◽

Anatomical Structures ◽

Developmental Networks ◽

Time Points ◽

Complex Processes

Background: Human brain development is a series of complex processes exhibiting profound changes from gestation to adulthood. Objective: We aimed to construct dynamic developmental networks for each anatomical structure of human brain based on omics’ levels in order to gain a new systematical brain map on molecular level. Method: We performed the brain development analyses by constructing dynamical networks between adjacent time points on different grouping levels of anatomical structures. The gene-time networks were first built to get the developing brain dynamical maps on transcriptome level. Then miRNA-mRNA networks and protein-protein networks were constructed by integrating the information from miRNomics and proteomics. The time and structure-specific biomarkers were filtered based on analyses of topological characters. Results: The most dramatical developmental time and structure were fetal-infancy and telencephalon, respectively. Cortex was the key developmental region in ‘late fetal and neonatal’ and ‘early infancy’. The development of temporal lobe was different from other lobes since the significant changes of molecules were found only in the comparison pair ‘early fetal-early mid-fetal’ and ‘adolescence-young adulthood’. Interestingly, the changes among different brain structures inside adolescence and adulthood were bigger than other time points. hsa-miR-548c-3p and H3C2 may be new brain developments indicators considering their key roles in networks. Conclusion: To our knowledge, this study is the first report of dynamical brain development maps for different anatomical structures on multiple omics’. The results provide a new sight of brain development in a systematical way which may provide a more accurate understanding of human brain.

Image quality of an intraoral storage phosphor imaging system for normal anatomical structures, proximal caries and decalcified bone changes

Oral Radiology ◽

10.1007/bf02489640 ◽

1997 ◽

Vol 13 (1) ◽

pp. 23-34 ◽

Cited By ~ 1

Author(s):

Jyouji Yoneda ◽

Takashi Sakurai ◽

Kousuke Nishimura

Keyword(s):

Image Quality ◽

Imaging System ◽

Anatomical Structures ◽

Proximal Caries ◽

Storage Phosphor ◽

Bone Changes

Impact of iterative metal artifact reduction on diagnostic image quality in patients with dental hardware

Acta Radiologica ◽

10.1177/0284185116646144 ◽

2016 ◽

Vol 58 (3) ◽

pp. 279-285 ◽

Cited By ~ 24

Author(s):

Jakob Weiß ◽

Christoph Schabel ◽

Malte Bongers ◽

Rainer Raupach ◽

Stephan Clasen ◽

...

Keyword(s):

Image Quality ◽

Ct Imaging ◽

Diagnostic Image Quality ◽

Artifact Reduction ◽

Metal Artifact ◽

Metal Artifact Reduction ◽

Metal Artifacts ◽

Diagnostic Image ◽

Anatomical Structures ◽

Dental Fillings

Background Metal artifacts often impair diagnostic accuracy in computed tomography (CT) imaging. Therefore, effective and workflow implemented metal artifact reduction algorithms are crucial to gain higher diagnostic image quality in patients with metallic hardware. Purpose To assess the clinical performance of a novel iterative metal artifact reduction (iMAR) algorithm for CT in patients with dental fillings. Material and Methods Thirty consecutive patients scheduled for CT imaging and dental fillings were included in the analysis. All patients underwent CT imaging using a second generation dual-source CT scanner (120 kV single-energy; 100/Sn140 kV in dual-energy, 219 mAs, gantry rotation time 0.28–1/s, collimation 0.6 mm) as part of their clinical work-up. Post-processing included standard kernel (B49) and an iterative MAR algorithm. Image quality and diagnostic value were assessed qualitatively (Likert scale) and quantitatively (HU ± SD) by two reviewers independently. Results All 30 patients were included in the analysis, with equal reconstruction times for iMAR and standard reconstruction (17 s ± 0.5 vs. 19 s ± 0.5; P > 0.05). Visual image quality was significantly higher for iMAR as compared with standard reconstruction (3.8 ± 0.5 vs. 2.6 ± 0.5; P < 0.0001, respectively) and showed improved evaluation of adjacent anatomical structures. Similarly, HU-based measurements of degree of artifacts were significantly lower in the iMAR reconstructions as compared with the standard reconstruction (0.9 ± 1.6 vs. –20 ± 47; P < 0.05, respectively). Conclusion The tested iterative, raw-data based reconstruction MAR algorithm allows for a significant reduction of metal artifacts and improved evaluation of adjacent anatomical structures in the head and neck area in patients with dental hardware.