المؤلفون: Chen X; Department of Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), 1-5-45, Yushima, Bunkyo-Ku, Tokyo 113-8549, Japan., Inoue G; Department of Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), 1-5-45, Yushima, Bunkyo-Ku, Tokyo 113-8549, Japan. Electronic address: inoue.ope@tmd.ac.jp., Fan L; Department of Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), 1-5-45, Yushima, Bunkyo-Ku, Tokyo 113-8549, Japan., Sekizawa O; Research & Utilization Division, Japan Synchrotron Radiation Research Institute (JASRI), SPring-8, 1-1-1 Kouto, Sayo-cho, Hyogo 679-5198, Japan., Nitta K; Research & Utilization Division, Japan Synchrotron Radiation Research Institute (JASRI), SPring-8, 1-1-1 Kouto, Sayo-cho, Hyogo 679-5198, Japan., Ikeda M; Department of Oral Biomedical Engineering, Tokyo Medical and Dental University Graduate School, 1-5-45 Yushima, Bunkyo-Ku, Tokyo 113-8549, Japan., Shimada Y; Department of Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), 1-5-45, Yushima, Bunkyo-Ku, Tokyo 113-8549, Japan.

المصدر: Journal of dentistry [J Dent] 2024 Jul; Vol. 146, pp. 105041. Date of Electronic Publication: 2024 May 16.

نوع المنشور: Journal Article; Randomized Controlled Trial

بيانات الدورية: Publisher: Elsevier Country of Publication: England NLM ID: 0354422 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1879-176X (Electronic) Linking ISSN: 03005712 NLM ISO Abbreviation: J Dent Subsets: MEDLINE

مواضيع طبية MeSH: Root Caries*/drug therapy , Glass Ionomer Cements*/chemistry , Glass Ionomer Cements*/therapeutic use , Silver Compounds*/therapeutic use , X-Ray Microtomography*/methods , Dentin*/drug effects , Dentin*/diagnostic imaging , Silver*/therapeutic use , Silver*/chemistry , Hardness* , Quaternary Ammonium Compounds*/therapeutic use , Cariostatic Agents*/therapeutic use, Humans ; Fluorides, Topical/therapeutic use ; Tooth Remineralization/methods ; Dental Restoration, Permanent/methods ; Spectrometry, X-Ray Emission

مستخلص: Objectives: This study aimed to measure the distribution of silver ion (Ag ⁺ ), mineral recovery, and nanohardness in carious lesions and comprehensively evaluate the degree of dentin restoration.
Methods: Sixty human teeth with root caries were randomly assigned to the control, silver diammine fluoride (SDF) [Safo], and SDF+Glass ionomer cement (GIC) treatment [Safo+Fuji] groups. Micro-computed tomography (micro-CT) was performed at five time points for each sample before/after treatment to evaluate mineral density within and around carious lesions. Three months following treatment, 12 samples were selected for synchrotron radiation X-ray fluorescence analysis to evaluate Ag ⁺ distribution, while 15 samples were selected for nanoindentation. Data were analyzed using Dunnett's T3 test for micro-CT and Wilcoxon rank sum test with Bonferroni correction (p = 0.017) for nanoindentation. The correlation between hardness and mineral change was analyzed using the Spearman rank correlation coefficient.
Results: The Safo and Safo+Fuji groups showed significantly higher mineral recovery rates than did the control group (p < 0.001). In the Safo group, Ag ⁺ accumulated in the deeper layers rather than the superficial layer of caries. In the Safo+Fuji group, Ag ⁺ was found evenly distributed throughout caries, with only a few Ag ⁺ detected in the GIC layer. Hardness in the Safo+Fuji group was significantly higher compared with the Safo group at depths in the range of 10-50 µm.
Conclusion: In the presence of GICs, SDF exhibited high remineralization capacity when diffusing throughout carious lesions over time. Combined treatment with SDF and GIC could strengthen root dentin even in the presence of caries.
Clinical Significance: We found that combination treatment with SDF and GIC could increase mineral density in caries and improve the hardness of the tooth structure compared with fluoride-based agents alone. These findings might pave the way for future clinical trials to determine the therapeutic potential of nanotechnology-based restorative materials.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 Elsevier Ltd. All rights reserved.)

المؤلفون: Lubis LE; Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Indonesia, Depok 16424, Indonesia., Rafika R; Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Indonesia, Depok 16424, Indonesia., Noerwasana AD; Indonesian Nuclear Energy Regulatory Agency, Jakarta 10120, Indonesia., Suryanti R; Indonesian Nuclear Energy Regulatory Agency, Jakarta 10120, Indonesia., Soejoko DS; Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Indonesia, Depok 16424, Indonesia.

المصدر: Radiation protection dosimetry [Radiat Prot Dosimetry] 2024 May 08; Vol. 200 (7), pp. 700-706.

نوع المنشور: Journal Article; Evaluation Study

بيانات الدورية: Publisher: Oxford University Press Country of Publication: England NLM ID: 8109958 Publication Model: Print Cited Medium: Internet ISSN: 1742-3406 (Electronic) Linking ISSN: 01448420 NLM ISO Abbreviation: Radiat Prot Dosimetry Subsets: MEDLINE

مواضيع طبية MeSH: Radiation Dosage* , Tomography Scanners, X-Ray Computed*/standards , Phantoms, Imaging*, Indonesia ; Humans ; Tomography, X-Ray Computed/methods ; Tomography, X-Ray Computed/standards

مستخلص: In this study, an evaluation of the compliance test data from 684 computed tomography (CT)-scanners in Indonesia for the 2019-22 test period was carried out. The study was aimed to describe the performance profile of CT-scanners in Indonesia and evaluate the testing protocol. A total of 87.8% of the CT-scanners unconditionally passed the tests, 8.8% passed the tests with conditions and 3.4% failed the tests. Of the devices conditionally passed the tests, the top two causes were water CT number accuracy (45.2%) and laser position accuracy (41.9%). Meanwhile, 75.0% of the failed devices were due to failing to meet the patient dose test criteria. The failure of the test for the water CT number accuracy parameter was caused by variations in the type of phantom used in the test, where several types of phantoms did not use water as material of the homogeneity module. Failures in laser position accuracy test were caused by the passing criteria that adjust to the minimum slice thickness, so that modern CT-scanner with small detector sizes and collimations tend not to pass. On the other hand, the failure on dose aspects was due to the frequent unavailability of baseline values for comparison. Of these top three failure causes, two of them, namely the CT number and dose test parameters, have been accommodated in the latest regulation (BAPETEN Regulation No. 2/2022) with a change in the evaluation method, while for the laser position accuracy test it is recommended to alter the passing criteria to an absolute value, namely 1 mm.
(© The Author(s) 2024. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oup.com.)

المؤلفون: Pondard S; Alara Expertise, 7 Allée de l'Europe, 67960 Entzheim, France. Electronic address: spondard@alara-expertise.fr., Desport C; Alara Expertise, 7 Allée de l'Europe, 67960 Entzheim, France. Electronic address: cdesport@alara-expertise.fr., Munier M; Fibermetrix, 7 Allée de l'Europe, 67960 Entzheim, France; Alara Group, 7 Allée de l'Europe, 67960 Entzheim, France., Kien N; Alara Expertise, 7 Allée de l'Europe, 67960 Entzheim, France., Rousseau H; Service de Radiologie, CHU Toulouse Rangueil, 1 Avenue du Professeur Jean Poulhes, 31400 Toulouse, France; Institut des maladies métaboliques et cardiovasculaires (I2MC) - UMR1297, Université de Toulouse, 1 Avenue Jean Poulhès, BP64225, 31432 Toulouse, France., Merignac O; Service de Radiologie Diagnostique et Interventionnelle adulte, Hôpital de Bicetre, DMU 14 Smart Imaging, AP-HP, 78 Rue du Général Leclerc 94270, Le Kremlin‑Bicetre, France; Université Paris-Saclay, CEA, CNRS, Inserm, BioMaps, 4 place du Général Leclerc, 91401 Orsay, France., Popotte C; Fibermetrix, 7 Allée de l'Europe, 67960 Entzheim, France., Moreno R; Alara Expertise, 7 Allée de l'Europe, 67960 Entzheim, France; Service de Radiologie, CHU Toulouse Rangueil, 1 Avenue du Professeur Jean Poulhes, 31400 Toulouse, France; Institut des maladies métaboliques et cardiovasculaires (I2MC) - UMR1297, Université de Toulouse, 1 Avenue Jean Poulhès, BP64225, 31432 Toulouse, France. Electronic address: rmoreno@alara-expertise.fr.

المصدر: Physica medica : PM : an international journal devoted to the applications of physics to medicine and biology : official journal of the Italian Association of Biomedical Physics (AIFB) [Phys Med] 2024 Jun; Vol. 122, pp. 103389. Date of Electronic Publication: 2024 May 30.

نوع المنشور: Journal Article; Multicenter Study

بيانات الدورية: Publisher: Istituti Editoriali e Poligrafici Internazionali Country of Publication: Italy NLM ID: 9302888 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1724-191X (Electronic) Linking ISSN: 11201797 NLM ISO Abbreviation: Phys Med Subsets: MEDLINE

مواضيع طبية MeSH: Head*/diagnostic imaging , Tomography, X-Ray Computed*/instrumentation , Phantoms, Imaging* , Signal-To-Noise Ratio* , Radiometry*/instrumentation, Humans ; Image Processing, Computer-Assisted/methods ; Quality Control ; Tomography Scanners, X-Ray Computed

مستخلص: Purpose: To evaluate the efficiency of organ-based tube current modulation (OBTCM) in head Computed Tomography (CT) for different radiology departments and manufacturers.
Materials and Methods: Five CT scanners from four radiology departments were evaluated in this study. All scans were performed using a standard and a routine head protocol. A scintillating fiber optic detector was placed directly on the gantry to measure the tube exit kerma. Image quality was quantified on a 16-cm HEAD phantom by measuring the signal-to-noise ratio (SNR) and the standard deviation of the Hounsfield units (HU) of circular regions of interest placed in the phantom. The Noise Power Spectrum (NPS) was also studied. Measured values were compared on images with and without OBTCM.
Results: The reduction rates in tube exit kerma, on the anterior part, vary between 11 % and 74 % depending on the CT scanner and the protocol used. The tube exit kerma on the posterior part remains unchanged in GE and Canon CT scanners. On the contrary, the tube exit kerma to the posterior part increases by up to 39 % in Siemens CT scanner. Image noise and SNR increase by up to 10 % in the five CT scanners. Nonetheless, the differences in noise and SNR are statistically significant (p-value < 0.05).The analysis of the NPS indicates that the noise texture remains unchanged.
Conclusion: OBTCM reduces the tube exit kerma to the anterior part of the gantry without reducing substantially image quality for head protocols.
Competing Interests: Declaration of competing interest The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: Séléna Pondard reports a relationship with ALARA Expertise that includes: employment. Corentin Desport reports a relationship with ALARA Expertise that includes: employment. Nicolas Kien reports a relationship with ALARA Expertise that includes: employment. Ramiro Moreno reports a relationship with ALARA Expertise that includes: employment. Mélodie Munier reports a relationship with Fibermetrix that includes: employment. Christian Popotte reports a relationship with Fibermetrix that includes: employment.
(Copyright © 2024 Associazione Italiana di Fisica Medica e Sanitaria. Published by Elsevier Ltd. All rights reserved.)

المؤلفون: Chen DT; Department of Civil, Environmental and Geomatic Engineering (CEGE), University College London (UCL), Chadwick Building, Gower Street, London, WC1E 6BT, UK., Roy A; Louisiana State University Center for Advanced Microstructures and Devices, Baton Rouge, LA, 70806, USA., Bogush A; Department of Civil, Environmental and Geomatic Engineering (CEGE), University College London (UCL), Chadwick Building, Gower Street, London, WC1E 6BT, UK., Stegemann JA; Department of Civil, Environmental and Geomatic Engineering (CEGE), University College London (UCL), Chadwick Building, Gower Street, London, WC1E 6BT, UK. Electronic address: j.stegemann@ucl.ac.uk.

المصدر: Journal of environmental management [J Environ Manage] 2024 Jun; Vol. 360, pp. 120994. Date of Electronic Publication: 2024 May 14.

نوع المنشور: Journal Article

بيانات الدورية: Publisher: Academic Press Country of Publication: England NLM ID: 0401664 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1095-8630 (Electronic) Linking ISSN: 03014797 NLM ISO Abbreviation: J Environ Manage Subsets: MEDLINE

مواضيع طبية MeSH: X-Ray Absorption Spectroscopy*, Metals/chemistry ; X-Ray Diffraction

مستخلص: The speciation of Cr, Zn, Cu and Pb in two metal finishing filter cakes (TX and ST) was investigated by X-ray absorption spectroscopy (XAS) complemented by X-ray fluorescence (XRF) and X-ray diffraction (XRD). XRF showed that concentrations of Cr, Zn, Cu and Pb were 1.4%, 0.19%, 0.20% and 0.01%, respectively, in TX, and 12.6%, 3.3%, 1.3% and 0.21% in ST. No crystalline phases were detected in TX by XRD whereas ST was dominated by calcite. Cr and Fe K edge XAS showed Cr to be trivalent and octahedrally coordinated, co-precipitated with Fe as Cr x Fe 1-x -(oxy)hydroxides in both filter cakes. Zn, P and Ca K edge XAS showed that 2ZnCO 3 ∙3Zn(OH) 2 and Zn 3 (PO 4 ) 2 were the dominant zinc-containing phases, with combined tetrahedral and octahedral coordination; Zn phases were slightly more crystalline in TX than ST. Pb L 3 edge X-ray absorption near edge spectroscopy (XANES) found that Pb was likely adsorbed on amorphous SiO 2 . Cu, Si and S K edge XAS showed that all Cu was divalent, and the dominant copper phases were found to be Cu 2 Cl(OH) 3 , Cu(OH) 2 and CuSO 4 ·5H 2 O for ST, whereas Cu appeared to adsorb to amorphous SiO 2 for TX, which contained much less Pb. Cr is thus immobilized in the filter cakes in a phase with low solubility at environmentally feasible pH values, whereas Zn, Cu and Pb could be released when the pH decreases below 8 or above 11. These findings are significant for the development of waste management regulations and/or metal recovery methods (e.g., hydro/pyrometallurgy).
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024. Published by Elsevier Ltd.)

المؤلفون: Frazer LL; Southwest Research Institute, USA. Electronic address: lance.frazer@swri.org., Louis N; Southwest Research Institute, USA; University of Michigan, USA., Zbijewski W; John Hopkins University, USA., Vaishnav J; Canon Medical Systems, USA., Clark K; University of Texas Health Science Center at San Antonio, USA., Nicolella DP; Southwest Research Institute, USA.

المصدر: Bone [Bone] 2024 Aug; Vol. 185, pp. 117115. Date of Electronic Publication: 2024 May 11.

نوع المنشور: Journal Article

بيانات الدورية: Publisher: Elsevier Science Country of Publication: United States NLM ID: 8504048 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1873-2763 (Electronic) Linking ISSN: 18732763 NLM ISO Abbreviation: Bone Subsets: MEDLINE

مواضيع طبية MeSH: Tomography, X-Ray Computed*/methods, Humans ; Female ; Aged ; Bone Density/physiology ; Bone and Bones/diagnostic imaging ; Bone and Bones/pathology ; Male ; Femur/diagnostic imaging ; Femur/pathology ; Deep Learning ; X-Ray Microtomography/methods ; Image Processing, Computer-Assisted/methods ; Aged, 80 and over ; Cancellous Bone/diagnostic imaging ; Cancellous Bone/pathology

مستخلص: Osteoporotic fractures, prevalent in the elderly, pose a significant health and economic burden. Current methods for predicting fracture risk, primarily relying on bone mineral density, provide only modest accuracy. If better spatial resolution of trabecular bone in a clinical scan were available, a more complete assessment of fracture risk would be obtained using microarchitectural measures of bone (i.e. trabecular thickness, trabecular spacing, bone volume fraction, etc.). However, increased resolution comes at the cost of increased radiation or can only be applied at small volumes of distal skeletal locations. This study explores super-resolution (SR) technology to enhance clinical CT scans of proximal femurs and better reveal the trabecular microarchitecture of bone. Using a deep-learning-based (i.e. subset of artificial intelligence) SR approach, low-resolution clinical CT images were upscaled to higher resolution and compared to corresponding MicroCT-derived images. SR-derived 2-dimensional microarchitectural measurements, such as degree of anisotropy, bone volume fraction, trabecular spacing, and trabecular thickness were within 16 % error compared to MicroCT data, whereas connectivity density exhibited larger error (as high as 1094 %). SR-derived 3-dimensional microarchitectural metrics exhibited errors <18 %. This work showcases the potential of SR technology to enhance clinical bone imaging and holds promise for improving fracture risk assessments and osteoporosis detection. Further research, including larger datasets and refined techniques, can advance SR's clinical utility, enabling comprehensive microstructural assessment across whole bones, thereby improving fracture risk predictions and patient-specific treatment strategies.
Competing Interests: Declaration of competing interest The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: Lance Frazer reports financial support was provided by Canon Medical Systems USA Inc. Jay Vaishnav reports a relationship with Canon Medical Systems USA Inc. that includes: employment. If there are other authors, they declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 Elsevier Inc. All rights reserved.)

المؤلفون: Varghese BA; Department of Radiology, Keck Medical Center, University of Southern California, Los Angeles, California, USA., Cen SY; Department of Radiology, Keck Medical Center, University of Southern California, Los Angeles, California, USA., Jensen K; Department of Physics and Computational Radiology, Oslo University Hospital, Oslo, Norway., Levy J; The Phantom Laboratory, Greenwich, New York, USA., Andersen HK; Department of Physics and Computational Radiology, Oslo University Hospital, Oslo, Norway., Schulz A; Department of Radiology and Nuclear Medicine, Oslo University Hospital, Oslo, Norway., Lei X; Department of Radiology, Keck Medical Center, University of Southern California, Los Angeles, California, USA., Duddalwar VA; Department of Radiology, Keck Medical Center, University of Southern California, Los Angeles, California, USA., Goodenough DJ; Department of Radiology, George Washington University, Washington, D.C., USA.

المصدر: Journal of applied clinical medical physics [J Appl Clin Med Phys] 2024 Apr; Vol. 25 (4), pp. e14309. Date of Electronic Publication: 2024 Feb 22.

نوع المنشور: Journal Article

بيانات الدورية: Publisher: Wiley on behalf of American Association of Physicists in Medicine Country of Publication: United States NLM ID: 101089176 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1526-9914 (Electronic) Linking ISSN: 15269914 NLM ISO Abbreviation: J Appl Clin Med Phys Subsets: MEDLINE

مواضيع طبية MeSH: Radiomics* , Tomography, X-Ray Computed*/methods, Humans ; Tomography Scanners, X-Ray Computed ; Phantoms, Imaging ; Liver/diagnostic imaging ; Water ; Image Processing, Computer-Assisted/methods

مستخلص: Objective: This study identifies key characteristics to help build a physical liver computed tomography (CT) phantom for radiomics harmonization; particularly, the higher-order texture metrics.
Materials and Methods: CT scans of a radiomics phantom comprising of 18 novel 3D printed inserts with varying size, shape, and material combinations were acquired on a 64-slice CT scanner (Brilliance 64, Philips Healthcare). The images were acquired at 120 kV, 250 mAs, CTDIvol of 16.36 mGy, 2 mm slice thickness, and iterative noise-reduction reconstruction (iDose, Philips Healthcare, Andover, MA). Radiomics analysis was performed using the Cancer Imaging Phenomics Toolkit (CaPTk), following automated segmentation of 3D regions of interest (ROI) of the 18 inserts. The findings were compared to three additional ROI obtained of an anthropomorphic liver phantom, a patient liver CT scan, and a water phantom, at comparable imaging settings. Percentage difference in radiomic metrics values between phantom and tissue was used to assess the biological equivalency and <10% was used to claim equivalent.
Results: The HU for all 18 ROI from the phantom ranged from -30 to 120 which is within clinically observed HU range of the liver, showing that our phantom material (T3-6B) is representative of biological CT tissue densities (liver) with >50% radiomic features having <10% difference from liver tissue. Based on the assessment of the Neighborhood Gray Tone Difference Matrix (NGTDM) metrics it is evident that the water phantom ROI show extreme values compared to the ROIs from the phantom. This result may further reinforce the difference between a structureless quantity such as water HU values and tissue HU values found in liver.
Conclusion: The 3-D printed patterns of the constructed radiomics phantom cover a wide span of liver tissue textures seen in CT images. Using our results, texture metrics can be selectively harmonized to establish clinically relevant and reliable radiomics panels.
(© 2024 The Authors. Journal of Applied Clinical Medical Physics is published by Wiley Periodicals, Inc. on behalf of The American Association of Physicists in Medicine.)

المؤلفون: Larjava HRS; Department of Medical Physics, Turku University Hospital and University of Turku, Turku, Finland. heli.larjava@varha.fi., Eneh CTM; Department of Medical Physics, Turku University Hospital, Turku, Finland., Niiniviita HM; Department of Medical Physics, Turku University Hospital and University of Turku, Turku, Finland.

المصدر: European radiology [Eur Radiol] 2024 Apr; Vol. 34 (4), pp. 2480-2486. Date of Electronic Publication: 2023 Sep 14.

نوع المنشور: Journal Article

بيانات الدورية: Publisher: Springer International Country of Publication: Germany NLM ID: 9114774 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1432-1084 (Electronic) Linking ISSN: 09387994 NLM ISO Abbreviation: Eur Radiol Subsets: MEDLINE

مواضيع طبية MeSH: Tomography, X-Ray Computed*/methods , Thorax*, Humans ; Radiation Dosage ; Tomography Scanners, X-Ray Computed ; Phantoms, Imaging

مستخلص: Objectives: The aim of the patient out-of-plane shield is to reduce the patient radiation dose. Its effect on tube current modulation was evaluated with the out-of-plane shield visible in the localizer but absent in the scan range in chest CT with different CT scanners.
Methods: An anthropomorphic phantom was scanned with six different CT scanners from three different vendors. The chest was first scanned without any shielding, and then with the out-of-plane shield within the localizer but outside the imaged volume. All pitch values of each scanner were used. The tube current values with and without the out-of-plane shield were collected and used to evaluate the effect of overscanning and tube current modulation (TCM) on patient radiation dose.
Results: The highest increase in cumulative mA was 217%, when the pitch was 1.531. The tube current value increased already 8.9 cm before the end of the scanned anatomy and the difference between the tube current of the last slices (with and without the out-of-plane shield in the localizer) was 976%.
Conclusion: Applying an out-of-plane shield outside the scanned volume but visible in the localizer images may increase the patient dose considerably if the scanner's TCM function is based only on localizer images.
Clinical Relevance Statement: The use of an out-of-plane shield in CT may strongly increase the tube current modulation and thus provide the patient with a higher radiation dose.
Key Points: • Applying an out-of-plane shield outside the scanned volume but visible in the localizer images may increase patient radiation dose considerably. • The effect is visible with scanners that use solely localizer-based tube current modulation. • Features like overscanning may be difficult for the user to notice when planning the scanning, and yet they may affect tube current modulation and through it to patient dose.
(© 2023. The Author(s).)

المؤلفون: LaBella A; Department of Radiology, Stony Brook University, Stony Brook, New York, USA., Zhang D; Department of Radiology, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts, USA.

المصدر: Journal of applied clinical medical physics [J Appl Clin Med Phys] 2024 Apr; Vol. 25 (4), pp. e14316. Date of Electronic Publication: 2024 Mar 11.

نوع المنشور: Journal Article

بيانات الدورية: Publisher: Wiley on behalf of American Association of Physicists in Medicine Country of Publication: United States NLM ID: 101089176 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1526-9914 (Electronic) Linking ISSN: 15269914 NLM ISO Abbreviation: J Appl Clin Med Phys Subsets: MEDLINE

مواضيع طبية MeSH: Tomography, X-Ray Computed*/methods , Radiology*, Humans ; Tomography Scanners, X-Ray Computed

مستخلص: CT protocol management is an arduous task that requires expertise from a variety of radiology professionals, including technologists, radiologists, radiology IT professionals, and medical physicists. Each CT vendor has unique, proprietary protocol file structures, some of which may vary by scanner model, making it difficult to develop a universal framework for distilling technical parameters to a human-readable file format. An ideal solution for CT protocol management is to minimize the work required for parameter extraction by introducing a data format into the workflow that is universal to all CT scanners. In this paper, we report a framework for CT protocol management that converts raw protocol files to an intermediary format before outputting them in a human-readable format for a variety of practical clinical applications, including routine protocol review, protocol version tracking, and cross-protocol comparisons. The framework was developed in Python 3. Technical parameters of interest were determined via collaborative effort between medical physicists and lead technologists. Protocol files were extracted and analyzed from a variety of scanners across our hospital-wide CT fleet, including various systems from Siemens and GE. Protocols were subcategorized based on relevant technical parameters into regular, dual-energy, and cardiac CT protocols. Backend code for technical parameter extraction from raw protocol files to a JavaScript Object Notation (JSON) format was performed on a per-system basis. Conversion from JSON to a readable output format (MS Excel) was performed identically for all scanners using the universal framework developed and presented in this work. Example results for Siemens and GE scanners are shown, including side-by-side comparisons for protocols with similar clinical indications. In conclusion, our CT protocol management framework may be deployed on any CT system to improve clinical efficiency in protocol review and upkeep.
(© 2024 The Authors. Journal of Applied Clinical Medical Physics published by Wiley Periodicals LLC on behalf of American Association of Physicists in Medicine.)

المؤلفون: Goertz L; Department of Radiology and Neuroradiology, Faculty of Medicine and University Hospital, University of Cologne, Kerpener Straße 62, 50937, Cologne, Germany. lukas.goertz@uk-koeln.de., Al-Sewaidi Y; Department of Interventional Radiology and Neuroradiology, Klinikum Hochsauerland, Arnsberg, Germany., Habib M; Department of Interventional Radiology and Neuroradiology, Klinikum Hochsauerland, Arnsberg, Germany., Zopfs D; Department of Radiology and Neuroradiology, Faculty of Medicine and University Hospital, University of Cologne, Kerpener Straße 62, 50937, Cologne, Germany., Reichardt B; Department of Interventional Radiology and Neuroradiology, Klinikum Hochsauerland, Arnsberg, Germany., Ranft A; Department of Interventional Radiology and Neuroradiology, Klinikum Hochsauerland, Arnsberg, Germany., Kabbasch C; Department of Radiology and Neuroradiology, Faculty of Medicine and University Hospital, University of Cologne, Kerpener Straße 62, 50937, Cologne, Germany.

المصدر: Scientific reports [Sci Rep] 2024 Mar 16; Vol. 14 (1), pp. 6393. Date of Electronic Publication: 2024 Mar 16.

نوع المنشور: Journal Article

بيانات الدورية: Publisher: Nature Publishing Group Country of Publication: England NLM ID: 101563288 Publication Model: Electronic Cited Medium: Internet ISSN: 2045-2322 (Electronic) Linking ISSN: 20452322 NLM ISO Abbreviation: Sci Rep Subsets: MEDLINE

مواضيع طبية MeSH: Tomography, X-Ray Computed*/methods , White Matter*, Humans ; Tomography Scanners, X-Ray Computed ; Head/diagnostic imaging ; Skull/diagnostic imaging ; Radiation Dosage

مستخلص: The use of mobile head CT scanners in the neurointensive care unit (NICU) saves time for patients and NICU staff and can reduce transport-related mishaps, but the reduced image quality of previous mobile scanners has prevented their widespread clinical use. This study compares the image quality of SOMATOM On.Site (Siemens Healthineers, Erlangen, Germany), a state-of-the-art mobile head CT scanner, and a conventional 64-slice stationary CT scanner. The study included 40 patients who underwent head scans with both mobile and stationary scanners. Gray and white matter signal and noise were measured at predefined locations on axial slices, and signal-to-noise ratios (SNRs) and contrast-to-noise ratios (CNRs) were calculated. Artifacts below the cranial calvaria and in the posterior fossa were also measured. In addition, image quality was subjectively assessed by two radiologists in terms of corticomedullary differentiation, subcalvarial space, skull artifacts, and image noise. Quantitative measurements showed significantly higher image quality of the stationary CT scanner in terms of noise, SNR and CNR of gray and white matter. Artifacts measured in the posterior fossa were higher with the mobile CT scanner, but subcalvarial artifacts were comparable. Subjective image quality was rated similarly by two radiologists for both scanners in all domains except image noise, which was better for stationary CT scans. The image quality of the SOMATOM On.Site for brain scans is inferior to that of the conventional stationary scanner, but appears to be adequate for daily use in a clinical setting based on subjective ratings.
(© 2024. The Author(s).)

المؤلفون: Illemann NM; University College of Northern Denmark, Selma Lagerløfts vej 2, 9220 Aalborg East, Denmark. Electronic address: nami@ucn.dk., Illemann TM; Department of the Built Environment, Aalborg University, Thomas Manns Vej 23, 9220 Aalborg East, Denmark.

المصدر: Radiography (London, England : 1995) [Radiography (Lond)] 2024 Mar; Vol. 30 (2), pp. 431-439. Date of Electronic Publication: 2024 Jan 09.

نوع المنشور: Systematic Review; Journal Article; Review

بيانات الدورية: Publisher: Elsevier B.V Country of Publication: Netherlands NLM ID: 9604102 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1532-2831 (Electronic) Linking ISSN: 10788174 NLM ISO Abbreviation: Radiography (Lond) Subsets: MEDLINE

مواضيع طبية MeSH: Magnetic Resonance Imaging*/instrumentation , Tomography, X-Ray Computed*/instrumentation, Humans ; Tomography Scanners, X-Ray Computed

مستخلص: Introduction: Mobile Imaging Trailers enable moving diagnostic imaging equipment between locations requiring very little setup and configuration, example given CT-scanners and MRI-scanners. However, despite the apparent benefits of utilising these imaging capabilities, very little research on the subject exists. This study aims at gaining an overview of the current state of the literature, using the scoping review methodology.
Methods: The systematic literature search was conducted in three databases: Scopus, Embase and PubMed. Included sources were extracted based on the objectives of the scoping review, and inspired by the by PRISMA-ScR.
Results: 29 papers were included.
Conclusion: The results of the review showed that three general categories of research on this subject exist - trailers used in research, trailers as the object of research and trailers as an element or tool of the research. Of these, the most prevalent one used is the latter - trailers used as an element or tool of the research. This; however, is an issue for the use of trailers in a clinical setting, as very little research has been conducted on how they might be used and how they compare to fixed installations. As seen during the recent COVID-19 pandemic, the potentials for the use of MITs are immense; however, with the current lack of knowledge and understanding, the full potential has not been realised, suggesting further research should be focused in this area.
Implications for Practice: This study has shown that the limited research in the area does point towards a few benefits of MITs; however, there is a clear lack of sufficient research on the field to say this with confidence.
Competing Interests: Conflict of interest statement None.
(Copyright © 2023 The Authors. Published by Elsevier Ltd.. All rights reserved.)