Registration Bone Scan in the Evaluation of Wrist Pain

1997 ◽  
Vol 22 (2) ◽  
pp. 161-166 ◽  
Author(s):  
A. MOHAMED ◽  
P. RYAN ◽  
M. LEWIS ◽  
J. M. JAROSZ ◽  
I. FOGELMAN ◽  
...  
Keyword(s):  
Early Diagnosis ◽  
Bone Scintigraphy ◽  
Bone Scan ◽  
Wrist Pain ◽  
X Rays ◽  
X Ray ◽  
Diagnosis And Management ◽  
Before And After

We assessed the value of bone scintigraphy combined with X-ray registration for the diagnosis and management of wrist pain in 65 patients. Studies were reported independently by two observers before and after registration. Registration improved localization of scan abnormalities in 53% (observer 1) and 61% (observer 2). In these patients, the bone scan contributed to the diagnosis independently of the X-ray in 37% and the management was altered in 31%. The value of the bone scan in the early diagnosis and management of wrist pain is increased when it is registered with X-rays.

Look at the whole X-ray, not just the bones

2006 ◽  
Vol 92 (3) ◽  
pp. 118-120
Author(s):  
S. Warwick ◽  
J. E. Smith ◽  
I. Higginson
Keyword(s):  
Early Diagnosis ◽  
Incidental Finding ◽  
X Rays ◽  
X Ray ◽  
Life Threatening

AbstractA case is presented where an incidental finding on a trauma radiograph led to early diagnosis of a potentially life-threatening tumour, highlighting the need to be vigilant when interpreting X-rays.

Preliminary Study on the Anti-radiation Effect of Jen-Sheng-Yang-Yung-Tang

1993 ◽  
Vol 21 (02) ◽  
pp. 187-195 ◽  
Author(s):  
Hsue-yin Hsu ◽  
Yau-hui Ho ◽  
Shi-Iong Lian ◽  
Chun-ching Lin
Keyword(s):  
Bone Marrow ◽  
Radiation Effect ◽  
Bone Marrow Cells ◽  
X Rays ◽  
Male Mice ◽  
X Ray ◽  
Colony Forming Units ◽  
Before And After ◽  
Preliminary Study ◽  
Different Doses

Six to seven week old male mice of ICR strain were exposed to different doses of x-rays to determine if Jen-Sheng-Yang-Yung-Tang could be a modifier in the elimination of radiation damage. Colony forming units of bone marrow cells in the spleen (CFUs) were measured before and after x-ray irradiation with intraperitoneal injection of 10 mg/20 g or 20 mg/20 g body weight of Jen-Sheng-Yang-Yung-Tang, once a day for seven consecutive days. The recovery of CFUs and hemocytes counts by 4 Gy irradiation with Jen-Sheng-Yang-Yung-Tang administration was faster for a concentration of 20 mg/20 g than 10 mg/20 g. The measurement of 10-day CFUs showed an increase of radiotolerance in the treatment of 20 mg/20 g administration before x-ray irradiation. The injection of Jen-Sheng-Yang-Yung-Tang accelerated the recovery of hemocyte counts in mice irradiated with 4 Gy x-ray; the effect was especially profound for leukocytes with 20 mg/20 g Jen-Sheng-Yang-Yung-Tang administration after irradiation.

The Ulnocarpal Stress Test in the Diagnosis of Ulnar-Sided Wrist Pain

1997 ◽  
Vol 22 (6) ◽  
pp. 719-723 ◽  
Author(s):  
R. NAKAMURA ◽  
E. HORII ◽  
T. IMAEDA ◽  
E. NAKAO ◽  
H. KATO ◽  
...  
Keyword(s):  
Bone Scan ◽  
Stress Test ◽  
Final Diagnosis ◽  
Wrist Pain ◽  
Wrist Arthroscopy ◽  
Resonance Imaging ◽  
Provocative Test ◽  
X Ray ◽  
Ligament Tear ◽  
Free Body

Forty-five patients with persistent ulnar-sided wrist pain and a positive ulnocarpal stress test were investigated by X-ray, arthrography, 99mTechnetium bone scanning, magnetic resonance imaging and wrist arthroscopy. Ulnar wrist pathology was positively identified in nine of 45 patients by X-ray, 18 of 37 by arthrography, 19 of 27 by bone scan, four of 33 by MRI, and in all 45 patients by arthroscopy. The final diagnosis was ulnocarpal abutment syndrome in 28 patients, traumatic triangular fibro-cartilage (TFC) tear in six, lunotriquetral (LT) ligament tear in five, TFC and LT ligament tear in one, wrist arthritis in four and cartilaginous free body in one. The ulnocarpal stress test is a useful provocative test, and a positive test suggests the presence of ulnar-sided wrist pathology. The test is sufficiently sensitive to warrant further investigation by arthroscopy.

scholarly journals A detailed X-ray investigation of ζ Puppis

2018 ◽  
Vol 609 ◽  
pp. A81 ◽  
Author(s):  
Yaël Nazé ◽  
Tahina Ramiaramanantsoa ◽  
Ian R. Stevens ◽  
Ian D. Howarth ◽  
Anthony F. J. Moffat
Keyword(s):  
Large Scale ◽  
Light Curves ◽  
Optical Data ◽  
X Rays ◽  
X Ray ◽  
Large Scale Structures ◽  
Line Shapes ◽  
Cyclic Behaviour ◽  
Flux Change ◽  
Before And After

Context. One of the optically brightest and closest massive stars, ζ Pup, is also a bright X-ray source. Previously, its X-ray emission was found to be variable with light curves harbouring “trends” with a typical timescale longer than the exposure length, i.e. >1 d. The origin of these changes was proposed to be linked to large-scale structures in the wind of ζ Pup, but further characterization of the variability at high energies was needed to investigate this scenario. Aims. Since the previous papers of this series, a number of new X-ray observations have become available. Furthermore, a cyclic behaviour with a 1.78 d period was identified in long optical photometric runs, which is thought to be associated with the launching mechanism of large-scale wind structures. Methods. We analysed these new X-ray data, revisited the old data, and compared the X-ray light curves with the optical data, notably those taken simultaneously. Results. The behaviour of ζ Pup in X-rays cannot be explained in terms of a perfect clock because the amplitude and shape of its variations change with time. For example, ζ Pup was much more strongly variable between 2007 and 2011 than before and after this interval. Comparing the X-ray spectra of the star at maximum and minimum brightness yields no compelling difference beyond the overall flux change: the temperatures, absorptions, and line shapes seem to remain constant, well within errors. The only common feature between X-ray datasets is that the variation amplitudes appear maximum in the medium (0.6–1.2 keV) energy band. Finally, no clear and coherent correlation can be found between simultaneous X-ray and optical data. Only a subgroup of observations may be combined coherently with the optical period of 1.78 d, although the simultaneous optical behaviour is unknown. Conclusions. The currently available data do not reveal any obvious, permanent, and direct correlation between X-ray and optical variations. The origin of the X-ray variability therefore still needs to be ascertained, highlighting the need for long-term monitoring in multiwavelengths, i.e. X-ray, UV, and optical.

scholarly journals Comparison of Change in Hindfoot Alignment with Coleman Block Testing Using Clinical Exam, X-ray, and Weight-bearing CT

2020 ◽  
Vol 5 (4) ◽  
pp. 2473011420S0004
Author(s):  
Ian Foran ◽  
Nasima Mehraban ◽  
Stephen K. Jacobsen ◽  
Daniel D. Bohl ◽  
Kamran S. Hamid ◽  
...  
Keyword(s):  
Ct Scan ◽  
Small Sample ◽  
X Rays ◽  
Hindfoot Alignment ◽  
X Ray ◽  
Clinical Exam ◽  
Average Change ◽  
Before And After ◽  
Block Test ◽  
Weightbearing Ct

Category: Hindfoot; Midfoot/Forefoot Introduction/Purpose: The Coleman block test has traditionally been used to distinguish between forefoot- and hindfoot-driven deformity as well as flexibility of cavovarus deformity. However, there has been no validation of the Coleman block test using x- rays or weightbearing CT scan. The purpose of this study was to compare hindfoot alignment in cavovarus feet with and without the Coleman block using clinical exam, x-ray, and weightbearing CT scan. Methods: We retrospectively evaluated 7 feet in 7 patients. The average age was 57, there were 5 males, and the average BMI was 34.7. Average calcaneal pitch was 30 degrees. Clinical measurements were made using standing talocalcaneal angle (STCA) and resting calcaneal stance position (RCSP) with and without a Coleman block using a camera positioned at 0 degrees to the heels. Hindfoot angle (HFA) was measured off of Saltzman-view x-rays and off of weightbearing CT coronal reconstructions with and without the Coleman block. Finally, foot ankle offset (FAO) was measured with and without the Coleman block from weightbearing CT using Cubeview TALAS software. Differences before and after Coleman block were measured using paired t- testing and correlations between different hindfoot alignment measurements were made using Pearson correlation coefficients. Results:: The average change in STCA before and after Coleman block placement was 2.9 degrees (7.14 varus without block, 4.28 degrees of varus with block; p<0.05). The average change in hindfoot angle before and after Coleman block using X-ray was 7.4 degrees (14 degrees varus without block, 6 degrees varus with block; p=0.08), and using CT was 3.9 degrees (14 degrees varus without block, 10 degrees varus with block; p= 0.06). There was no significant change in FAO before and after Coleman block testing. STCA was best-correlated with FAO (R= 0.7, p<0.05). CT HFA was also well-correlated with FAO (R=0.68, p<0.05). There was lesser correlation between X-ray HFA and FAO (R=0.608, p<0.05) and X-ray HFA and SCTA (p=0.63, p<0.05). Conclusion:: Although Coleman block testing resulted in a decrease in varus, no patient had full re-constitution of physiologic hindfoot valgus with any measurement method. This suggests that either the forefoot was a partial (but never a complete) ‘driver’ of hindfoot varus deformity, or that there was some degree of rigidity in all patients tested. FAO did not demonstrate a statistically significant difference with and without Coleman block on this small sample size. FAO was best correlated with both clinical exam and CT HFA measurements. Clinical exam and weightbearing CT may be more reliable than radiographs in measuring cavovarus hindfoot alignment. [Figure: see text]

scholarly journals The accuracy of different imaging techniques in diagnosis of acute hematogenous osteomyelitis

Medicina ◽  
2009 ◽  
Vol 45 (8) ◽  
pp. 624 ◽  
Author(s):  
Dalius Malcius ◽  
Martynas Jonkus ◽  
Gintaras Kuprionis ◽  
Almantas Maleckas ◽  
Eglė Monastyreckienė ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Bone Scintigraphy ◽  
Odds Ratio ◽  
Diagnostic Odds Ratio ◽  
X Rays ◽  
Resonance Imaging ◽  
X Ray ◽  
Hematogenous Osteomyelitis ◽  
Acute Hematogenous Osteomyelitis

Objective. The aim of this study was to establish and compare diagnostic accuracy (sensitivity, specificity, and diagnostic odds ratio) of plain x-ray, ultrasonography, bone scintigraphy, computed tomography (CT), and magnetic resonance imaging (MRI) in pediatric acute hematogenous osteomyelitis. Material and methods. Analysis of patients’ data, hospitalized at the Department of Pediatric Surgery with suspected acute hematogenous osteomyelitis in the period of 2002–2008, was carried out prospectively. Inclusion criteria were age of 1–18 years, pain in bone area, fever, functional disorder, and (or) signs of infection. Plain x-ray, ultrasonography, bone scintigraphy, computed tomography, and magnetic resonance imaging were performed. The recommendations of Standards for Reporting of Diagnostic Accuracy were used in study design. Results. A total of 183 patients were included into the study. Acute hematogenous osteomyelitis was diagnosed in 156 (85%) patients, and 27 (15%) had other diseases. A total of 169 early plain x-rays (median on the first day of hospital stay), 142 late x-rays (15th day of hospital stay), 82 ultrasonographies (second day), 76 bone scintigraphy (third day), 38 MRI scans (seventh day), and 17 CT (15th day) were performed. The sensitivity of ultrasonography was 0.55 (95% CI, 0.43–0.67); specificity, 0.47 (95% CI, 0.24–0.7); and diagnostic odds ratio, 1.08 (95% CI, 0.3–3.84). The sensitivity of CT was 0.67 (95% CI, 0.38–0.88); specificity, 0.5 (95% CI, 0.01– 0.98); and diagnostic odds ratio, 2.0 (95% CI, 0.02–172.4). The sensitivity of early x-ray was 0.16 (95% CI 0.1–0.23); specificity, 0.96 (95% CI, 0.78–1.0); and diagnostic odds ratio, 4.34 (95% CI, 0.63–186.3). The sensitivity of MRI was 0.81 (95% CI, 0.64–0.93); specificity, 0.67 (95% CI, 0.22–0.96); and diagnostic odds ratio, 8.67 (95% CI, 0.91–108.5). The sensitivity of late x-ray was 0.82 (95% CI, 0.75–0.88); specificity, 0.92 (95% CI, 0.62–1.0); and diagnostic odds ratio, 51.17 (95% CI, 6.61–2222.0). The sensitivity of bone scintigraphy was 0.81 (95% CI, 0.68–0.90); specificity, 0.84 (95% CI, 0.60–0.97); and diagnostic odds ratio, 22.30 (95% CI, 4.9–132.7). Conclusions. Our analysis showed that late x-ray is the most valuable radiologic method in the diagnosis of acute hematogenous osteomyelitis, but bone scintigraphy and magnetic resonance imaging are the most valuable tests at the onset of the disease.

COVID-DETECT: A DEEP LEARNING APPROACH FOR CLASSIFICATION OF COVID-19 PNEUMONIA FROM LUNG SEGMENTED CHEST X-RAYS

2020 ◽  
pp. 2150010
Author(s):  
S. Rajkumar ◽  
P. V. Rajaraman ◽  
Haree Shankar Meganathan ◽  
V. Sapthagirivasan ◽  
K. Tejaswinee ◽  
...  
Keyword(s):  
Deep Learning ◽  
Learning Algorithm ◽  
Rapid Screening ◽  
X Rays ◽  
X Ray ◽  
Deep Learning Algorithm ◽  
X Ray Imaging ◽  
Before And After ◽  
Wide Availability ◽  
Novel Coronavirus

The novel coronavirus (COVID-19) was first reported in the Wuhan City of China in 2019 and became a pandemic. The outbreak has caused shocking effects to the people across the globe. It is important to screen a majority of the population in every country and for the respective governments to take appropriate action. There is a need for a rapid screening system to triage and recommend the patients for appropriate treatment. Chest X-ray imaging is one of the potential modalities, which has ample advantages such as wide availability even in the villages, portability, fast data sharing option from the point of capturing to the point of investigation, etc. The aim of the proposed work is to develop a deep learning algorithm for screening COVID-19 cases by leveraging the widely available X-ray imaging. We have built a deep learning Convolutional Neural Network model utilizing a combination of the public domain (open-source COVID-19) and private data (pneumonia and normal cases). The dataset was used before and after the segmentation of the lung region for training and testing. The outcome of the classification after lung segmentation resulted in significant superiority. The average accuracy achieved by the proposed system was 96%. The heat maps incorporated in the system were helpful for our radiologists to cross-verify whether the appropriate features are identified. This system (COVID-Detect) can be used in remote places in the countries affected by COVID-19 for mass screening of suspected cases and suggesting appropriate actions, such as recommending confirmatory tests.

Radiation Hardening of Simox Buried Oxide by Nitridation

1992 ◽  
Vol 284 ◽  
Author(s):  
Pramod C. Karulkar ◽  
P. W. Wyatt
Keyword(s):  
Silicon Film ◽  
Radiation Hardness ◽  
Radiation Hardening ◽  
Flat Band ◽  
X Rays ◽  
Flat Band Voltage ◽  
X Ray ◽  
Thin Film Capacitors ◽  
Oxide Substrates ◽  
Before And After

ABSTRACTRadiation hardening of SIMOX buried oxides by nitridation is demonstrated in this paper. Bare SIMOX oxide substrates, obtained by selective reactive ion etching of the top silicon film, were nitrided by annealing in ammonia at a high temperature. Al-Si thin film capacitors were fabricated on the SIMOX oxide and also on concurrently processed dry thermal oxides of similar thickness. Radiation hardness was tested by C-V measurements before and after the exposure to x-rays in an ARACOR x-ray source. SIMOX oxides were found to be inherently more resistant to radiation damage than the thermal oxides. Nitridation improved the radiation hardness of SIMOX oxides similarly to that of thermal oxides. Reoxidation nearly reversed the radiation hardening effect of nitridation in these thick (> 300 nm) oxides. For example, the following shifts in the flat band voltage were obtained when the capacitors were biased with ±5 V on the Al-Si dots and exposed to 100 krad (SiO2): -24 V for SIMOX oxide, -14.2 V for nitrided SIMOX oxide, and -22.8 V for reoxidized nitrided SIMOX oxide.

scholarly journals In Situ Ptychography of Heterogeneous Catalysts using Hard X-Rays: High Resolution Imaging at Ambient Pressure and Elevated Temperature

2016 ◽  
Vol 22 (1) ◽  
pp. 178-188 ◽  
Author(s):  
Sina Baier ◽  
Christian D. Damsgaard ◽  
Maria Scholz ◽  
Federico Benzi ◽  
Amélie Rochet ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Elevated Temperature ◽  
Gas Flow ◽  
Heterogeneous Catalysts ◽  
Ambient Pressure ◽  
Ex Situ ◽  
X Rays ◽  
X Ray ◽  
Before And After

AbstractA new closed cell is presented for in situ X-ray ptychography which allows studies under gas flow and at elevated temperature. In order to gain complementary information by transmission and scanning electron microscopy, the cell makes use of a Protochips E-chipTM which contains a small, thin electron transparent window and allows heating. Two gold-based systems, 50 nm gold particles and nanoporous gold as a relevant catalyst sample, were used for studying the feasibility of the cell. Measurements showing a resolution around 40 nm have been achieved under a flow of synthetic air and during heating up to temperatures of 933 K. An elevated temperature exhibited little influence on image quality and resolution. With this study, the potential of in situ hard X-ray ptychography for investigating annealing processes of real catalyst samples is demonstrated. Furthermore, the possibility to use the same sample holder for ex situ electron microscopy before and after the in situ study underlines the unique possibilities available with this combination of electron microscopy and X-ray microscopy on the same sample.

Primary DNA Damage Assessed With the Comet Assay and Comparison to the Absorbed Dose of Diagnostic X-rays in Children

2009 ◽  
Vol 28 (5) ◽  
pp. 405-416 ◽  
Author(s):  
Đurđica Milković ◽  
Vera Garaj-Vrhovac ◽  
Mária Ranogajec-Komor ◽  
Saveta Miljanić ◽  
Goran Gajski ◽  
...  
Keyword(s):  
Dna Damage ◽  
Comet Assay ◽  
Absorbed Dose ◽  
Peripheral Blood Lymphocytes ◽  
X Rays ◽  
X Ray ◽  
Before And After ◽  
The Individual ◽  
Dose Measurements ◽  
Posterior Anterior

The aim of this work is to assess DNA damage in peripheral blood lymphocytes of children prior to and following airway X-ray examinations of the chest using the alkaline comet assay and to compare data with the measured absorbed dose. Twenty children with pulmonary diseases, between the ages of 5 and 14 years, are assessed. Absorbed dose measurements are conducted for posterior–anterior projection on the forehead, thyroid gland, gonads, chest, and back. Doses are measured using thermoluminescent and radiophotoluminescent dosimetry systems. Differences between tail lengths, tail intensity, and tail moments as well as for the long-tailed nuclei before and after exposures are statistically significant and are dependent on the individual. The results demonstrate the usefulness of the comet assay as a measure of X-ray damage to lymphocytes in a clinical setting. Doses measured with both dosimeters show satisfactory agreement (0.01 mSv) and are suitable for dosimetric measurements in X-ray diagnostics.

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