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[PMID]:28742062
[Au] Autor:Moore CS; Wood TJ; Saunderson JR; Beavis AW
[Ad] Endereço:Radiation Physics Department, Queen's Centre for Oncology and Haematology, Castle Hill Hospital, Hull & East Yorkshire Hospitals NHS Trust, Castle Road, Hull, HU16 5JQ, United Kingdom. Faculty of Science and Engineering, University of Hull, Cottingham Road, Hull, HU6 7RX, United Kingdom.
[Ti] Título:A method to incorporate the effect of beam quality on image noise in a digitally reconstructed radiograph (DRR) based computer simulation for optimisation of digital radiography.
[So] Source:Phys Med Biol;62(18):7379-7393, 2017 Sep 01.
[Is] ISSN:1361-6560
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The use of computer simulated digital x-radiographs for optimisation purposes has become widespread in recent years. To make these optimisation investigations effective, it is vital simulated radiographs contain accurate anatomical and system noise. Computer algorithms that simulate radiographs based solely on the incident detector x-ray intensity ('dose') have been reported extensively in the literature. However, while it has been established for digital mammography that x-ray beam quality is an important factor when modelling noise in simulated images there are no such studies for diagnostic imaging of the chest, abdomen and pelvis. This study investigates the influence of beam quality on image noise in a digital radiography (DR) imaging system, and incorporates these effects into a digitally reconstructed radiograph (DRR) computer simulator. Image noise was measured on a real DR imaging system as a function of dose (absorbed energy) over a range of clinically relevant beam qualities. Simulated 'absorbed energy' and 'beam quality' DRRs were then created for each patient and tube voltage under investigation. Simulated noise images, corrected for dose and beam quality, were subsequently produced from the absorbed energy and beam quality DRRs, using the measured noise, absorbed energy and beam quality relationships. The noise images were superimposed onto the noiseless absorbed energy DRRs to create the final images. Signal-to-noise measurements in simulated chest, abdomen and spine images were within 10% of the corresponding measurements in real images. This compares favourably to our previous algorithm where images corrected for dose only were all within 20%.
[Mh] Termos MeSH primário: Simulação por Computador
Processamento de Imagem Assistida por Computador/normas
Mamografia/normas
Imagens de Fantasmas
Intensificação de Imagem Radiográfica/normas
Tomografia Computadorizada por Raios X/normas
[Mh] Termos MeSH secundário: Algoritmos
Seres Humanos
Mamografia/métodos
Intensificação de Imagem Radiográfica/métodos
Processamento de Sinais Assistido por Computador
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180305
[Lr] Data última revisão:
180305
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170726
[St] Status:MEDLINE
[do] DOI:10.1088/1361-6560/aa81fb


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[PMID]:29185322
[Au] Autor:Ganz SD
[Ti] Título:Enhanced Diagnosis and Treatment Planning for Implants.
[So] Source:Dent Today;35(10):108, 110, 112-3, 2016 Oct.
[Is] ISSN:8750-2186
[Cp] País de publicação:United States
[La] Idioma:eng
[Mh] Termos MeSH primário: Implantes Dentários
Planejamento de Assistência ao Paciente
[Mh] Termos MeSH secundário: Tomografia Computadorizada de Feixe Cônico
Seres Humanos
Imagem Tridimensional
Arcada Parcialmente Edêntula/diagnóstico por imagem
Arcada Parcialmente Edêntula/cirurgia
Intensificação de Imagem Radiográfica
[Pt] Tipo de publicação:CASE REPORTS; JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Dental Implants)
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180220
[Lr] Data última revisão:
180220
[Sb] Subgrupo de revista:D
[Da] Data de entrada para processamento:171201
[St] Status:MEDLINE


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[PMID]:29419670
[Au] Autor:Sasaki T; Fujimoto Y; Ishitoya S; Nabaa B; Watanabe N; Yamaki T; Takahashi K
[Ti] Título:Improved detectability of thromboses of the lower limb using low kilovoltage computed tomography.
[So] Source:Medicine (Baltimore);97(6):e9775, 2018 Feb.
[Is] ISSN:1536-5964
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:To determine the utility of low kilovoltage computed tomographic venography (CTV) for the detection of deep venous thrombus in the lower limbs.Twenty-one thrombi in 19 enrolled patients were investigated in this retrospective study. Patients were initially scanned using CTV at 100 kVp, at the femur level, followed by an immediate switch to 80 kVp. We assessed the CT values of thrombi and veins and performed subjective evaluation for detecting thrombi using a 5-point scoring system: 1, unable to evaluate due to noise or artifacts; 2, equivocal venous thrombus; 3, possible venous thrombus; 4, probable venous thrombus; and 5, definite venous thrombus.Venous density on 100-kVp images (mean ±â€ŠSD [standard deviation]: 122 ±â€Š23 HU, 95% confidence interval [CI]: 111-133 Hounsfield unit [HU]) was significantly lower than that on 80-kVp images (136 ±â€Š24 HU, 95% CI: 125-147 HU, P < .001). There was no significant difference in thrombi between 100-kVp images (55 ±â€Š14 HU, 95% CI: 49-61 HU) and 80-kVp images (57 ±â€Š16, 95% CI: 50-64 HU, P = .168). The thrombus to vein ratio on 100-kVp images (0.47 ±â€Š0.20, 95% CI: 0.39-0.56) was significantly higher than that on 80-kVp images (0.44 ±â€Š0.16, 95% CI: 0.37-0.51, P = .048). The mean 5-point score was significantly higher on the 80-kVp images (4.76) than on the 100-kVp images (4.45, P = .016).Lower kilovoltage CTV significantly improved thrombotic to venous contrasts in the lower limbs.
[Mh] Termos MeSH primário: Extremidade Inferior/irrigação sanguínea
Flebografia/métodos
Trombose/diagnóstico por imagem
Tomografia Computadorizada por Raios X/métodos
Trombose Venosa/diagnóstico
[Mh] Termos MeSH secundário: Idoso
Feminino
Seres Humanos
Japão
Masculino
Meia-Idade
Intensificação de Imagem Radiográfica/métodos
Estudos Retrospectivos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180216
[Lr] Data última revisão:
180216
[Sb] Subgrupo de revista:AIM; IM
[Da] Data de entrada para processamento:180209
[St] Status:MEDLINE
[do] DOI:10.1097/MD.0000000000009775


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[PMID]:28466009
[Au] Autor:Han G; Liu X; Soomro NQ; Sun J; Zhao Y; Zhao X; Zhou C
[Ad] Endereço:Beijing Key Laboratory of Intelligent Information Technology, School of Computer Science and Technology, Beijing Institute of Technology, Beijing, China.
[Ti] Título:Empirical Driven Automatic Detection of Lobulation Imaging Signs in Lung CT.
[So] Source:Biomed Res Int;2017:3842659, 2017.
[Is] ISSN:2314-6141
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Computer-aided detection (CAD) of lobulation can help radiologists to diagnose/detect lung diseases easily and accurately. Compared to CAD of nodule and other lung lesions, CAD of lobulation remained an unexplored problem due to very complex and varying nature of lobulation. Thus, many state-of-the-art methods could not detect successfully. Hence, we revisited classical methods with the capability of extracting undulated characteristics and designed a sliding window based framework for lobulation detection in this paper. Under the designed framework, we investigated three categories of lobulation classification algorithms: template matching, feature based classifier, and bending energy. The resultant detection algorithms were evaluated through experiments on LISS database. The experimental results show that the algorithm based on combination of global context feature and BOF encoding has best overall performance, resulting in 1 score of 0.1009. Furthermore, bending energy method is shown to be appropriate for reducing false positives. We performed bending energy method following the LIOP-LBP mixture feature, the average positive detection per image was reduced from 30 to 22, and 1 score increased to 0.0643 from 0.0599. To the best of our knowledge this is the first kind of work for direct lobulation detection and first application of bending energy to any kind of lobulation work.
[Mh] Termos MeSH primário: Neoplasias Pulmonares/diagnóstico por imagem
Pulmão/diagnóstico por imagem
Nódulo Pulmonar Solitário/diagnóstico por imagem
Tomografia Computadorizada por Raios X/métodos
[Mh] Termos MeSH secundário: Seres Humanos
Pulmão/fisiopatologia
Neoplasias Pulmonares/diagnóstico
Neoplasias Pulmonares/patologia
Reconhecimento Automatizado de Padrão
Intensificação de Imagem Radiográfica
Interpretação de Imagem Radiográfica Assistida por Computador
Nódulo Pulmonar Solitário/diagnóstico
Tórax/diagnóstico por imagem
Tórax/patologia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180216
[Lr] Data última revisão:
180216
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170504
[St] Status:MEDLINE
[do] DOI:10.1155/2017/3842659


  5 / 17872 MEDLINE  
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[PMID]:29390488
[Au] Autor:Liu M; Liu W; Li H; Shu X; Tao X; Zhai Z
[Ad] Endereço:Department of Radiology.
[Ti] Título:Evaluation of takayasu arteritis with delayed contrast-enhanced MR imaging by a free-breathing 3D IR turbo FLASH.
[So] Source:Medicine (Baltimore);96(51):e9284, 2017 Dec.
[Is] ISSN:1536-5964
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The primary aim of our case-control study was to observe delayed contrast-enhanced magnetic resonance imaging (DCE-MRI) in patients with Takayasu arteritis (TA) in comparison with magnetic resonance angiography (MRA). Twenty-seven patients including 15 with active TA and 12 with stable TA who underwent both aortic MRA and DCE-MRI were included. A total of 27 sex- and age-matched healthy volunteers were enrolled as the control group. MRA were obtained with T1WI-volume-interpolated breath-hold examination sequence or fast low-angle shot (FLASH) sequence. DCE-MRI was acquired with a free-breathing three-dimensional inversion recovery Turbo fast low-angle shot (3D IR Turbo FLASH). Neither stenosis nor delayed enhancement of arterial wall was shown in the control group. In patients with stable TA, arterial stenosis was observed on MRA. On DCE-MR, delayed enhancement of arterial walls could be observed in the active TA group but not in the stable TA group or the control group. Stenotic arteries on MRA were comparable in the active TA and stable TA (χ = 2.70, P = .259); however, delayed enhancement of arterial walls in the active-TA group were more than those in the stable group (χ = 27.00, P < .001). Our results suggest that DCE-MRI with the free-breathing 3D IR Turbo FLASH sequence could assess TA and delayed enhancement on DCE-MRI is one characteristics of the active TA.
[Mh] Termos MeSH primário: Imagem Tridimensional
Angiografia por Ressonância Magnética/métodos
Intensificação de Imagem Radiográfica/métodos
Arterite de Takayasu/diagnóstico por imagem
[Mh] Termos MeSH secundário: Adulto
Suspensão da Respiração
Estudos de Casos e Controles
Meios de Contraste
Feminino
Seres Humanos
Masculino
Sensibilidade e Especificidade
Arterite de Takayasu/fisiopatologia
Adulto Jovem
[Pt] Tipo de publicação:JOURNAL ARTICLE; OBSERVATIONAL STUDY
[Nm] Nome de substância:
0 (Contrast Media)
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180214
[Lr] Data última revisão:
180214
[Sb] Subgrupo de revista:AIM; IM
[Da] Data de entrada para processamento:180203
[St] Status:MEDLINE
[do] DOI:10.1097/MD.0000000000009284


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[PMID]:29402000
[Au] Autor:Rose M; Senkbeil T; von Gundlach AR; Stuhr S; Rumancev C; Dzhigaev D; Besedin I; Skopintsev P; Loetgering L; Viefhaus J; Rosenhahn A; Vartanyants IA
[Ti] Título:Quantitative ptychographic bio-imaging in the water window.
[So] Source:Opt Express;26(2):1237-1254, 2018 Jan 22.
[Is] ISSN:1094-4087
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Coherent X-ray ptychography is a tool for highly dose efficient lensless nano-imaging of biological samples. We have used partially coherent soft X-ray synchrotron radiation to obtain a quantitative image of a laterally extended, dried, and unstained fibroblast cell by ptychography. We used data with and without a beam stop that allowed us to measure coherent diffraction with a high-dynamic range of 1.7·10 . As a quantitative result, we obtained the refractive index values for two regions of the cell with respect to a reference area. Due to the photon energy in the water window we obtained an extremely high contrast of 53% at 71 nm half-period resolution. The dose applied in our experiment was 9.5·10 Gy and is well below the radiation damage threshold. The concept for dynamic range improvement for low dynamic range detectors with a beam stop opens the path for high resolution nano-imaging of a variety of samples including cryo-preserved, hydrated and unstained biological cells.
[Mh] Termos MeSH primário: Algoritmos
Fibroblastos
Microscopia/métodos
Intensificação de Imagem Radiográfica/métodos
Difração de Raios X
[Mh] Termos MeSH secundário: Fótons
Dose de Radiação
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180208
[Lr] Data última revisão:
180208
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180207
[St] Status:MEDLINE
[do] DOI:10.1364/OE.26.001237


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[PMID]:29292338
[Au] Autor:Hambright D; Hellman M; Barrack R
[Ad] Endereço:Barnes-Jewish Hospital , 660 South Euclid, Campus Box 8233, St. Louis, MO 63110, USA.
[Ti] Título:Intra-operative digital imaging: assuring the alignment of components when undertaking total hip arthroplasty.
[So] Source:Bone Joint J;100-B(1 Supple A):36-43, 2018 Jan.
[Is] ISSN:2049-4408
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:AIMS: The aims of this study were to examine the rate at which the positioning of the acetabular component, leg length discrepancy and femoral offset are outside an acceptable range in total hip arthroplasties (THAs) which either do or do not involve the use of intra-operative digital imaging. PATIENTS AND METHODS: A retrospective case-control study was undertaken with 50 patients before and 50 patients after the integration of an intra-operative digital imaging system in THA. The demographics of the two groups were comparable for body mass index, age, laterality and the indication for surgery. The digital imaging group had more men than the group without. Surgical data and radiographic parameters, including the inclination and anteversion of the acetabular component, leg length discrepancy, and the difference in femoral offset compared with the contralateral hip were collected and compared, as well as the incidence of altering the position of a component based on the intra-operative image. RESULTS: Digital imaging took a mean of five minutes (2.3 to 14.6) to perform. Intra-operative changes with the use of digital imaging were made for 43 patients (86%), most commonly to adjust leg length and femoral offset. There was a decrease in the incidence of outliers when using intra-operative imaging compared with not using it in regard to leg length discrepancy (20% 52%, p = 0.001) and femoral offset inequality (18% 44%, p = 0.004). There was also a difference in the incidence of outliers in acetabular inclination (0% 7%, p = 0.023) and version (0% 4%, p = 0.114) compared with historical results of a high-volume surgeon at the same centre. CONCLUSION: The use of intra-operative digital imaging in THA improves the accuracy of the positioning of the components at THA without adding a substantial amount of time to the operation. Cite this article: 2018;100B(1 Supple A):36-43.
[Mh] Termos MeSH primário: Artroplastia de Quadril/métodos
Anteversão Óssea/prevenção & controle
Prótese de Quadril
Cuidados Intraoperatórios/métodos
Desigualdade de Membros Inferiores/prevenção & controle
Complicações Pós-Operatórias/prevenção & controle
Intensificação de Imagem Radiográfica
[Mh] Termos MeSH secundário: Acetábulo/diagnóstico por imagem
Adulto
Idoso
Idoso de 80 Anos ou mais
Artroplastia de Quadril/instrumentação
Anteversão Óssea/epidemiologia
Anteversão Óssea/etiologia
Feminino
Fêmur/diagnóstico por imagem
Seres Humanos
Desigualdade de Membros Inferiores/epidemiologia
Desigualdade de Membros Inferiores/etiologia
Masculino
Meia-Idade
Duração da Cirurgia
Complicações Pós-Operatórias/epidemiologia
Estudos Retrospectivos
Resultado do Tratamento
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1801
[Cu] Atualização por classe:180104
[Lr] Data última revisão:
180104
[Sb] Subgrupo de revista:AIM; IM
[Da] Data de entrada para processamento:180103
[St] Status:MEDLINE
[do] DOI:10.1302/0301-620X.100B1.BJJ-2017-0596.R1


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[PMID]:29157549
[Au] Autor:White SM
[Ad] Endereço:Private Practice, 8 Brenda Lane, Merrimack, NH 03054, USA. Electronic address: susanwhite@ucla.edu.
[Ti] Título:Malignant Lesions in the Dentomaxillofacial Complex.
[So] Source:Radiol Clin North Am;56(1):63-76, 2018 Jan.
[Is] ISSN:1557-8275
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Malignancies in the maxillofacial region are rare but comprise a broad spectrum of lesions. Given the potential for malignancies to mimic dental/sinus/temporomandibular joint pathology or remain asymptomatic, the judicious radiologist will be familiar with the initial and unique malignant changes affecting the dentition, periodontium, and supporting osseous structures on conventional film, dental, and sinus imaging. This article is meant to serve as a complement to the many excellent texts dedicated to advanced imaging techniques for the staging of known malignancies. The lesions discussed are a representative sample of malignancies involving hard tissues of the maxillofacial complex but are far from complete.
[Mh] Termos MeSH primário: Neoplasias Faciais/diagnóstico por imagem
Neoplasias Faciais/patologia
Neoplasias Maxilomandibulares/diagnóstico por imagem
Neoplasias Maxilomandibulares/patologia
Radiografia Dentária/métodos
[Mh] Termos MeSH secundário: Diagnóstico Diferencial
Seres Humanos
Estadiamento de Neoplasias/métodos
Intensificação de Imagem Radiográfica/métodos
[Pt] Tipo de publicação:JOURNAL ARTICLE; REVIEW
[Em] Mês de entrada:1711
[Cu] Atualização por classe:171128
[Lr] Data última revisão:
171128
[Sb] Subgrupo de revista:AIM; IM
[Da] Data de entrada para processamento:171122
[St] Status:MEDLINE


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[PMID]:29157548
[Au] Autor:Scarfe WC; Toghyani S; Azevedo B
[Ad] Endereço:Radiology and Imaging Sciences, Department of Surgical & Hospital Dentistry, University of Louisville, 501 South Preston Street, Louisville, KY 40202, USA.
[Ti] Título:Imaging of Benign Odontogenic Lesions.
[So] Source:Radiol Clin North Am;56(1):45-62, 2018 Jan.
[Is] ISSN:1557-8275
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Numerous benign cysts or solid tumors may present in the jaws. These arise from tooth-forming tissues in the dental alveolus or from nonodontogenic tissues in the basal bone of the mandible and maxilla. Radiologists provide 2 deliverables to assist in diagnosis and management: (1) appropriately formatted images demonstrating the location and extent of the lesion and (2) interpretive reports highlighting specific radiologic findings and an impression providing a radiologic differential diagnosis. This article provides guidance on essential image protocols for planning treatments, a radiologic differential diagnostic algorithm based on location and pattern recognition, and a summary of the main features of benign odontogenic lesions.
[Mh] Termos MeSH primário: Algoritmos
Cistos Maxilomandibulares/diagnóstico por imagem
Neoplasias Maxilomandibulares/diagnóstico por imagem
Intensificação de Imagem Radiográfica/métodos
Radiografia Dentária/métodos
[Mh] Termos MeSH secundário: Diagnóstico Diferencial
Seres Humanos
[Pt] Tipo de publicação:JOURNAL ARTICLE; REVIEW
[Em] Mês de entrada:1711
[Cu] Atualização por classe:171128
[Lr] Data última revisão:
171128
[Sb] Subgrupo de revista:AIM; IM
[Da] Data de entrada para processamento:171122
[St] Status:MEDLINE


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[PMID]:29157547
[Au] Autor:Mardini S; Gohel A
[Ad] Endereço:BeamReaders, Inc, 7117 West Hood Place, Suite 110, Kennewick, WA 99336, USA. Electronic address: shaza@beamreaders.com.
[Ti] Título:Imaging of Odontogenic Infections.
[So] Source:Radiol Clin North Am;56(1):31-44, 2018 Jan.
[Is] ISSN:1557-8275
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Odontogenic infections represent a common clinical problem in patients of all ages. The presence of teeth enables the direct spread of inflammatory products from dental caries, trauma, and/or periodontal disease into the maxilla and mandible. The radiographic changes seen depend on the type and duration of the inflammatory process and host body response. Imaging plays a central role in identifying the source of infection and the extent of the disease spread and in detecting any complications. Many different imaging modalities can be used. The radiographic features associated with acute and chronic inflammatory processes are discussed.
[Mh] Termos MeSH primário: Infecções Bacterianas/diagnóstico por imagem
Cárie Dentária/diagnóstico por imagem
Infecção Focal Dentária/diagnóstico por imagem
Doenças Periodontais/diagnóstico por imagem
Radiografia Dentária/métodos
Traumatismos Dentários/diagnóstico por imagem
[Mh] Termos MeSH secundário: Diagnóstico Diferencial
Seres Humanos
Posicionamento do Paciente/métodos
Intensificação de Imagem Radiográfica/métodos
[Pt] Tipo de publicação:JOURNAL ARTICLE; REVIEW
[Em] Mês de entrada:1711
[Cu] Atualização por classe:171128
[Lr] Data última revisão:
171128
[Sb] Subgrupo de revista:AIM; IM
[Da] Data de entrada para processamento:171122
[St] Status:MEDLINE



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