RADIOGRAPHIC MEASUREMENT TECHNIQUES

Neurosurgery ◽  
2008 ◽  
Vol 63 (suppl_3) ◽  
pp. A40-A45 ◽  
Author(s):  
Peter D. Angevine ◽  
Michael G. Kaiser
Keyword(s):  
Treatment Plan ◽  
Measurement Techniques ◽  
Radiographic Measurement ◽  
Spinal Deformities ◽  
X Ray ◽  
Appropriate Treatment ◽  
Key Characteristics

ABSTRACT THE EVALUATION AND treatment of spinal deformities begins with the accurate measurement of appropriate spinal parameters. The surgeon must ensure that the patient is positioned properly for all necessary x-ray scans and that the proper studies are completed. The relevant measurements must be identified and recorded for each study. Understanding the proper measurement techniques will increase the accuracy and reliability of the measurements. From these precise measurements the surgeon can begin to determine key characteristics of the deformity and develop an appropriate treatment plan.

scholarly journals Accuracy of radiographic measurement techniques for the Taylor spatial frame mounting parameters

2021 ◽  
Vol 22 (1) ◽  
Author(s):  
Jan Gessmann ◽  
Sven Frieler ◽  
Matthias Königshausen ◽  
Thomas A. Schildhauer ◽  
Yannik Hanusrichter ◽  
...  
Keyword(s):  
Measurement Techniques ◽  
Image Intensifier ◽  
Precise Determination ◽  
Taylor Spatial Frame ◽  
Radiographic Measurement ◽  
Image Method ◽  
X Ray ◽  
Spatial Frame ◽  
Radiographic Measurements ◽  
Soft Copy

Abstract Aim The correction accuracy of the Taylor Spatial Frame (TSF) fixator depends considerably on the precise determination of the mounting parameters (MP). Incorrect parameters result in secondary deformities that require subsequent corrections. Different techniques have been described to improve the precision of MP measurement, although exact calculation is reportedly impossible radiologically. The aim of this study was to investigate the accuracy of intraoperative and postoperative radiographic measurement methods compared to direct MP measurement from TSF bone mounting. Methods A tibial Sawbone® model was established with different origins and reference ring positions. First, reference MPs for each origin were measured directly on the frame and bone using a calibrated, digital vernier calliper. In total 150 MPs measured with three different radiographic measurement techniques were compared to the reference MPs: digital radiographic measurements were performed using soft-copy PACS images without (method A) and with (method B) calibration and calibrated image intensifier images (method C). Results MPs measured from a non-calibrated X-ray image (method A) showed the highest variance compared to the reference MPs. A greater distance between the origin and the reference ring corresponded to less accurate MP measurements with method A. However, the MPs measured from calibrated X-ray images (method B) and calibrated image intensifier images (method C) were intercomparable (p = 0.226) and showed only minor differences compared to the reference values but significant differences to method A (p < 0,001). Conclusion The results demonstrate that MPs can be accurately measured with radiographic techniques when using calibration markers and a software calibration tool, thus minimizing the source of error and improving the quality of correction.

scholarly journals X-Ray Image based COVID-19 Detection using Pre-trained Deep Learning Models

2020 ◽  
Author(s):  
Michael J Horry ◽  
Subrata Chakraborty ◽  
Manoranjan Paul ◽  
Anwaar Ulhaq ◽  
Biswajeet Pradhan ◽  
...  
Keyword(s):  
Deep Learning ◽  
Treatment Plan ◽  
Classification Models ◽  
Learning Models ◽  
Comparative Testing ◽  
New Approach ◽  
X Ray ◽  
Appropriate Treatment ◽  
Dataset Size ◽  
Deep Learning Model

Detecting COVID-19 early may help in devising an appropriate treatment plan and disease containment decisions. In this study, we demonstrate how pre-trained deep learning models can be adopted to perform COVID-19 detection using X-Ray images. The aim is to provide over-stressed medical professionals a second pair of eyes through intelligent image classification models. We highlight the challenges (including dataset size and quality) in utilising current publicly available COVID-19 datasets for developing useful deep learning models. We propose a semi-automated image pre-processing model to create a trustworthy image dataset for developing and testing deep learning models. The new approach is aimed to reduce unwanted noise from X-Ray images so that deep learning models can focus on detecting diseases with specific features from them. Next, we devise a deep learning experimental framework, where we utilise the processed dataset to perform comparative testing for several popular and widely available deep learning model families such as VGG, Inception, Xception, and Resnet. The experimental results highlight the suitability of these models for current available dataset and indicates that models with simpler networks such as VGG19 performs relatively better with up to 83% precision. This will provide a solid pathway for researchers and practitioners to develop improved models in the future.

scholarly journals Reliability of new radiographic measurement techniques for elbow bony impingement

2022 ◽  
Vol 0 (0) ◽  
Author(s):  
Uros Meglic ◽  
Oskar Zupanc
Keyword(s):  
Clinical Evaluation ◽  
Treatment Plan ◽  
Pearson Correlation ◽  
Measurement Techniques ◽  
Intraclass Correlation ◽  
Radiographic Measurement ◽  
Impingement Angle ◽  
Rater Reliability ◽  
Bony Impingement ◽  
Radiographic Parameters

Abstract Background Identifying the location and scale of radiographic changes in elbow bony impingement (EBI) is critical in formulating an appropriate diagnosis and treatment plan for such patients. The purpose of present study was to evaluate the intra-rater and inter-rater reliability of the new radiographic parameters, Anterior Impingement angle (AIa) and Posterior Impingement angle (PIa), for EBI. In addition, to determine if there was a relationship between radiographic parameters and clinical evaluation. Patients and methods Three raters of different levels of training evaluated the radiographs of 60 patients (30 in EBI group and 30 in normal group) twice, at least 2 weeks apart. Intra-rater and inter-rater reliabilities were calculated by Intraclass Correlation Coefficients (ICC) with 95% confidence intervals. Correlation between radiographic parameters and clinical evaluation was calculated by Pearson correlation coefficient. Results In both groups, intra-rater and inter-rater reliabilities were substantial. There were no significant differences in reliability between upper-hand expert surgeons and resident for either measurement. Good correlation was observed between impingement arcs and range of motion values. Conclusions Both AIa and PIa measurements demonstrated substantial intra-rater and inter-rater reliability for normal radiographs and in EBI patients. Good reliability, for either expert surgeons or residents in training, and good correlation between radiographic measurements and manual testing, appoints this method may be easily and reliably used in every day practice.

scholarly journals The effects of a preoperative multidisciplinary conference on outcomes for high-risk patients with challenging surgical treatment options: a retrospective study

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Masayoshi Koike ◽  
Mie Yoshimura ◽  
Yasushi Mio ◽  
Shoichi Uezono
Keyword(s):  
Patient Safety ◽  
Retrospective Study ◽  
High Risk ◽  
Treatment Plan ◽  
Treatment Options ◽  
High Risk Patients ◽  
Appropriate Treatment ◽  
Risk Patients ◽  
Treatment Plans ◽  
Multidisciplinary Conference

Abstract Background Surgical options for patients vary with age and comorbidities, advances in medical technology and patients’ wishes. This complexity can make it difficult for surgeons to determine appropriate treatment plans independently. At our institution, final decisions regarding treatment for patients are made at multidisciplinary meetings, termed High-Risk Conferences, led by the Patient Safety Committee. Methods In this retrospective study, we assessed the reasons for convening High-Risk Conferences, the final decisions made and treatment outcomes using conference records and patient medical records for conferences conducted at our institution from April 2010 to March 2018. Results A total of 410 High-Risk Conferences were conducted for 406 patients during the study period. The department with the most conferences was cardiovascular surgery (24%), and the reasons for convening conferences included the presence of severe comorbidities (51%), highly difficult surgeries (41%) and nonmedical/personal issues (8%). Treatment changes were made for 49 patients (12%), including surgical modifications for 20 patients and surgery cancellation for 29. The most common surgical modification was procedure reduction (16 patients); 4 deaths were reported. Follow-up was available for 21 patients for whom surgery was cancelled, with 11 deaths reported. Conclusions Given that some change to the treatment plan was made for 12% of the patients discussed at the High-Risk Conferences, we conclude that participants of these conferences did not always agree with the original surgical plan and that the multidisciplinary decision-making process of the conferences served to allow for modifications. Many of the modifications involved reductions in procedures to reflect a more conservative approach, which might have decreased perioperative mortality and the incidence of complications as well as unnecessary surgeries. High-risk patients have complex issues, and it is difficult to verify statistically whether outcomes are associated with changes in course of treatment. Nevertheless, these conferences might be useful from a patient safety perspective and minimize the potential for legal disputes.

scholarly journals Towards a methodology for the characterisation of the fabric of wet clays using X-ray scattering

2019 ◽  
Vol 92 ◽  
pp. 01005
Author(s):  
Georgios Birmpilis ◽  
Reza Ahmadi-Naghadeh ◽  
Jelke Dijkstra
Keyword(s):  
Materials Science ◽  
Measurement Techniques ◽  
Invasive Technique ◽  
Colloidal Systems ◽  
Characteristic Distance ◽  
X Ray ◽  
Hydrophobic Coating ◽  
X Ray Scattering ◽  
Wide Range ◽  
Ray Scattering

X-ray scattering is a promising non-invasive technique to study evolving nano- and micromechanics in clays. This study discusses the experimental considerations and a successful method to enable X-ray scattering to study clay samples at two extreme stages of consolidation. It is shown that the proposed sample environment comprising flat capillaries with a hydrophobic coating can be used for a wide range of voids ratios ranging from a clay suspension to consolidated clay samples, that are cut from larger specimens of reconstituted or natural clay. The initial X-ray scattering results using a laboratory instrument indicate that valuable information on, in principal evolving, clay fabric can be measured. Features such as characteristic distance between structural units and particle orientations are obtained for a slurry and a consolidated sample of kaolinite. Combined with other promising measurement techniques from Materials Science the proposed method will help advance the contemporary understanding on the behaviour of dense colloidal systems of clay, as it does not require detrimental sample preparation

X-RAY PHOTOELECTRON SPECTROSCOPY STUDIES ON THE BONDING PROPERTIES OF AMORPHOUS CARBON NITRIDE FILMS SYNTHESIZED BY PULSED LASER DEPOSITION WITH DIFFERENT SUBSTRATE TEMPERATURES

2005 ◽  
Vol 12 (02) ◽  
pp. 185-195
Author(s):  
M. RUSOP ◽  
T. SOGA ◽  
T. JIMBO
Keyword(s):  
Pulsed Laser Deposition ◽  
Amorphous Carbon ◽  
Photoelectron Spectroscopy ◽  
Carbon Nitride ◽  
Measurement Techniques ◽  
Pulsed Laser ◽  
Laser Deposition ◽  
X Ray ◽  
Amorphous Carbon Nitride ◽  
Substrate Temperatures

Amorphous carbon nitride films ( a-CN x) were deposited by pulsed laser deposition of camphoric carbon target with different substrate temperatures (ST). The influence of ST on the synthesis of a-CN x films was investigated. The nitrogen-to-carbon (N/C) and oxygen-to-carbon (O/C) atomic ratios, bonding state, and microstructure of the deposited a-CN x films were characterized by X-ray photoelectron spectroscopy and were confirmed by other standard measurement techniques. The bonding states between C and N , and C and O in the deposited films were found to be significantly influenced by ST during the deposition process. The N/C and O/C atomic ratios of the a-CN x films reached the maximum value at 400°C. ST of 400°C was proposed to promote the desired sp 3-hybridized C and the C 3 N 4 phase. The C–N bonding of C–N , C=N and C≡N were observed in the films.

Updates in insomnia diagnosis and treatment

2019 ◽  
Vol 54 (4-5) ◽  
pp. 275-289 ◽  
Author(s):  
Scott Bragg ◽  
JJ Benich ◽  
Natalie Christian ◽  
Josh Visserman ◽  
John Freedy
Keyword(s):  
Drug Therapy ◽  
Behavioral Therapy ◽  
Treatment Plan ◽  
Treatment Options ◽  
First Line ◽  
Safety Concerns ◽  
Diagnostic And Statistical Manual ◽  
First Line Therapy ◽  
Appropriate Treatment ◽  
Central Nervous System Depression

Introduction Insomnia is the most commonly reported sleep disorder and remains undertreated in many patients. New changes to the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition, have changed the way insomnia is diagnosed. In patients who suffer from insomnia, a number of available treatment options exist including both behavioral therapy and medications. Literature Review: First line therapy for insomnia should always include behavioral modifications such as sleep hygiene and insomnia-oriented cognitive behavioral therapy. In patients deemed to need pharmacotherapy, first line medications include nonbenzodiazepine hypnotics (i.e., z-drugs) and antidepressants depending on the patients’ needs and comorbidities. The risk of next day impairment, parasomnias, and central nervous system depression are some of the most feared side effects with z-drugs. Second line drug therapy includes melatonin and suvorexant. Several concerns exist for suvorexant similar to other insomnia medications, but melatonin remains one of the safest medication alternatives. Other medication options such as benzodiazepines, antihistamines, and antipsychotics should rarely be used because of weak effectiveness data or serious safety concerns. Discussion The most appropriate treatment plan needs to be tailored to meet the needs of individual patients. Many patient factors (e.g., age, other comorbidities, specific problems with sleep) need to be considered before prescribing drug therapy for patients suffering from insomnia. Medications with the best evidence and fewest safety concerns should be prioritized when clinicians work with patients to determine the most appropriate treatment plan. Conclusions Nondrug treatment should be the emphasis for managing insomnia, but several options exist for patients needing multimodal therapy to improve their symptoms and maximize their quality of life. Z-drugs and antidepressants are first line medications options, but other options may be considered when tailored to individual patients. Medications should only be used intermittently and short term until nondrug treatments help to change a patient’s sleep routine.

scholarly journals Diffracting-grain identification from electron backscatter diffraction maps during residual stress measurements: a comparison between the sin2ψ and cosα methods

2019 ◽  
Vol 52 (4) ◽  
pp. 828-843 ◽  
Author(s):  
Dorian Delbergue ◽  
Damien Texier ◽  
Martin Lévesque ◽  
Philippe Bocher
Keyword(s):  
Residual Stress ◽  
Grain Size ◽  
Tilt Angle ◽  
Measurement Errors ◽  
Electron Backscatter Diffraction ◽  
Measurement Techniques ◽  
Single Exposure ◽  
X Ray ◽  
Electron Backscatter ◽  
Backscatter Diffraction

X-ray diffraction (XRD) is a widely used technique to evaluate residual stresses in crystalline materials. Several XRD measurement methods are available. (i) The sin2ψ method, a multiple-exposure technique, uses linear detectors to capture intercepts of the Debye–Scherrer rings, losing the major portion of the diffracting signal. (ii) The cosα method, thanks to the development of compact 2D detectors allowing the entire Debye–Scherrer ring to be captured in a single exposure, is an alternative method for residual stress measurement. The present article compares the two calculation methods in a new manner, by looking at the possible measurement errors related to each method. To this end, sets of grains in diffraction condition were first identified from electron backscatter diffraction (EBSD) mapping of Inconel 718 samples for each XRD calculation method and its associated detector, as each method provides different sets owing to the detector geometry or to the method specificities (such as tilt-angle number or Debye–Scherrer ring division). The X-ray elastic constant (XEC) ½S 2, calculated from EBSD maps for the {311} lattice planes, was determined and compared for the different sets of diffracting grains. It was observed that the 2D detector captures 1.5 times more grains in a single exposure (one tilt angle) than the linear detectors for nine tilt angles. Different XEC mean values were found for the sets of grains from the two XRD techniques/detectors. Grain-size effects were simulated, as well as detector oscillations to overcome them. A bimodal grain-size distribution effect and `artificial' textures introduced by XRD measurement techniques are also discussed.

scholarly journals Orthodontic Management of a Mandibular Double-tooth Incisor: A Case Report

2020 ◽  
Vol 14 (1) ◽  
pp. 219-255
Author(s):  
Paola Martina Marra ◽  
Ludovica Nucci ◽  
Luigi Femiano ◽  
Vincenzo Grassia ◽  
Livia Nastri ◽  
...  
Keyword(s):  
Rare Case ◽  
Treatment Plan ◽  
Maxillary Expansion ◽  
Two Phase ◽  
X Ray ◽  
Class 1 ◽  
Specific Complex ◽  
Fixed Appliances ◽  
Lip Bumper ◽  
Lower Arch

The presence of a double-tooth requires specific complex management due to the need for differential diagnosis and following treatment choices. The aim of this report was to present a rare case of a geminated mandibular lateral incisor, treated with an orthodontic approach. A Caucasian 10.9-year-old girl presented a lower right double-tooth incisor, with a class 1 molar and a class 2 cuspid tendency on both sides. The upper arch was constricted as shown by bilaterally tendencies to cross-bite, a slightly lower midline deviation was reported and a lack of space for all four permanent cuspids was confirmed also by the panoramic X-ray. In the lower arch, there was a severe crowding of about 14 mm and a buccally ectopic left canine. Overbite was normal and Overjet minimally increased. The double-tooth was identified like a geminated tooth, for the presence of one root and one pulp canal of increased size, as shown by the radiographic examinations. The anomalous tooth was managed with an orthodontic approach associated with a progressive stripping to reshape the crown. A two-phase treatment plan was performed, based on first maxillary expansion and lip bumper and then fixed appliances, in order to achieve a proper occlusion and a better aesthetic.

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