Imaging and Radiation Research最新文献_第6页

Doppler-echo guided angioplasty in the treatment of arterio-venous fistula stenosis for hemodialysis 多普勒回声引导血管成形术治疗血液透析动静脉瘘狭窄

Imaging and Radiation Research Pub Date : 1970-01-01 DOI: 10.24294/irr.v5i1.1745

E. M. Torres, M. M. Joan, Laura Calsina Juscafresa, Carlos Ruiz Carmona, A. C. Velasco

{"title":"Doppler-echo guided angioplasty in the treatment of arterio-venous fistula stenosis for hemodialysis","authors":"E. M. Torres, M. M. Joan, Laura Calsina Juscafresa, Carlos Ruiz Carmona, A. C. Velasco","doi":"10.24294/irr.v5i1.1745","DOIUrl":"https://doi.org/10.24294/irr.v5i1.1745","url":null,"abstract":"Introduction: Stenoses in the path of arteriovenous fistulas (AVF) for hemodialysis are a very prevalent problem and there is long experience in their treatment by percutaneous angioplasty (PTA). These procedures, however, involve non-negligible equipment requirements, exposure to radiation and intravenous contrast that are not beneficial for the patient and make their performance more complex. This study reviews our initial experience with Doppler ultrasound-guided angioplasty. Methods: Prospective cohort of patients with native AVF dysfunction due to significant venous stenosis treated by Doppler echo-guided PTA. AVF puncture, lesion catheterization, balloon localization and inflation, and outcome verification were performed under ultrasound guidance. Only one fistulography was performed before and another one after dilatation. As a control, the cases performed during the same period by the usual angiographic method were also collected. Results: Between February 2015 and September 2018, 51 PTAs were performed on native AVF, of which 27 were echogenic (mean age, 65.3 years; 63% male). The technical success rate was 96%. In 26% of cases, PTA was repeated due to residual stenosis after angiographic imaging. There were 7.3% periprocedural complications. 92% of the AVFs were punctured at 24 hours. Primary patency at 1 month, 6 months and 1 year was 100%, 64.8% and 43.6%, and assisted patency was 100%, 87.2% and 74.8%. There were no significant differences in immediate or late results with respect to angiographically guided AVF angioplasty. Conclusions: AVF-PTA can be performed safely and effectively guided by Doppler ultrasound, which simplifies the logistics required for its performance, although we still need to improve the capacity for early verification of the result with this imaging technique.","PeriodicalId":153727,"journal":{"name":"Imaging and Radiation Research","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1970-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115112643","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Multi-target UAV miniature staring hyperspectral imager radiation correction 多目标无人机微型凝视高光谱成像仪辐射校正

Imaging and Radiation Research Pub Date : 1970-01-01 DOI: 10.24294/irr.v2i1.1718

Changchun Li, Yanjie Wang, Chunyan Ma, Xiaoxiao Ma, Shuangting Wang

{"title":"Multi-target UAV miniature staring hyperspectral imager radiation correction","authors":"Changchun Li, Yanjie Wang, Chunyan Ma, Xiaoxiao Ma, Shuangting Wang","doi":"10.24294/irr.v2i1.1718","DOIUrl":"https://doi.org/10.24294/irr.v2i1.1718","url":null,"abstract":"The micro staring hyperspectral imager can simultaneously acquire two spatial and one spectral images, and only record the external orientation elements of the entire hyperspectral image rather than the external orientation elements of each frame of the image, which avoids the geometric instability during scanning, effectively solves the problem of large geometric deformation of the small line scanning hyperspectral imager, and is suitable for the small UAV load platform with unstable attitude. At present, most of the research focuses on the radio-metric correction method of line scan hyperspectral imager. The application time of staring hyperspectral imager is short, and there is no mature data processing re-search at home and abroad, which hinders the application of UAV micro staring hyperspectral imaging system. In this paper, the calibration method of the linearity and variability of the radiation response of the micro staring hyperspectral imager on the UAV is studied, and the effectiveness of this method is quantitatively evaluated. The results show that the hyperspectral image has obvious vignetting effect and strip phenomenon before the correction of radiation response variability. After the correction, the radiation response variation coefficient of pixels in different bands decreases significantly, and the vignetting effect and image strip decrease significantly. In this paper, a multi-target radiometric calibration method is proposed, and the accuracy of radiometric calibration is verified by comparing the calibrated hyperspectral image spectrum with the measured ground object spectrum of the ground spectrometer. The results show that the calibration results of the multi-target radiometric calibration method show better results, especially for the near-infrared band, and the difference with the surface reflectance measured by the spectrometer is small.","PeriodicalId":153727,"journal":{"name":"Imaging and Radiation Research","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1970-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116473229","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Application of infrared thermography in radiation protection and other medical fields 红外热成像在辐射防护等医学领域的应用

Imaging and Radiation Research Pub Date : 1970-01-01 DOI: 10.24294/irr.v4i1.1740

Zhen Yao, Minyan Zhao, Yulong Liu

引用次数: 0

Focused algorithms of X-ray imaging on the basis of multi-line scanning 基于多线扫描的x射线成像聚焦算法

Imaging and Radiation Research Pub Date : 1970-01-01 DOI: 10.24294/irr.v4i1.1738

Ke-Zhao Li, Bingshan Liu, Lipeng Wang, Xinyue Zhang, Jixing Guo

引用次数: 0

Analysis for the integration of images obtained by computed tomography and magnetic resonance imaging 计算机断层扫描和磁共振成像图像的整合分析

Imaging and Radiation Research Pub Date : 1970-01-01 DOI: 10.24294/irr.v3i1.1721

Meisbel Daudinot López, Yoander Estrada Sardina

引用次数: 0

Initial results of magnetic resonance hysterosalpingography diagnostic performance 磁共振子宫输卵管造影诊断性能的初步结果

Imaging and Radiation Research Pub Date : 1970-01-01 DOI: 10.24294/irr.v5i2.1755

A. Kohan, M. Kucharczyk, N. Posadas, Noelia N. Napoli, S. J. Gil, Nora Angélica Fuentes, R. García-Mónaco, C. Chacón

{"title":"Initial results of magnetic resonance hysterosalpingography diagnostic performance","authors":"A. Kohan, M. Kucharczyk, N. Posadas, Noelia N. Napoli, S. J. Gil, Nora Angélica Fuentes, R. García-Mónaco, C. Chacón","doi":"10.24294/irr.v5i2.1755","DOIUrl":"https://doi.org/10.24294/irr.v5i2.1755","url":null,"abstract":"Objective: to determine the diagnostic performance of magnetic resonance hysterosalpingography (HSG-MRI), using laparoscopy as the reference method. Materials and methods: 22 patients were included. All underwent HSG-MRI with a 1.5 Tesla resonator and then laparoscopy with chromotubation. Two radiologists examined the MRIs, determining tubal patency by consensus. Descriptive and diagnostic performance analyses were performed. Results: HSG-MRI had a success rate of 91%. Study duration was 49 ± 15 minutes, volume injected 26 ± 16 cm3 and pain scale 30 ± 19 out of 100. Sensitivity and specificity of HSG-MRI were 100% for global and left Cotte test, and 25% and 93.3% for right Cotte test, respectively. There were 2 minor complications and no major complications. Discussion: our initial results demonstrated high sensitivity and specificity. Although other studies analyzed the ability of HSG-MRI to assess tubal patency with good results, the use of a flawed reference standard left room for reasonable doubt, preventing a recommendation based on solid evidence. However, when comparing our results with those published, we observed a high degree of concordance insofar as the positive effusion is correctly diagnosed with a specificity of 100% or with a percentage close to this figure.","PeriodicalId":153727,"journal":{"name":"Imaging and Radiation Research","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1970-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129108292","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Neuropsychological and magnetic resonance imaging (MRI) diagnostics in secondary progressive multiple sclerosis 继发性进展性多发性硬化的神经心理学和磁共振成像(MRI)诊断

Imaging and Radiation Research Pub Date : 1970-01-01 DOI: 10.24294/irr.v5i2.1752

I. Penner, A. Gass, H. Schreiber, M. Wattjes

{"title":"Neuropsychological and magnetic resonance imaging (MRI) diagnostics in secondary progressive multiple sclerosis","authors":"I. Penner, A. Gass, H. Schreiber, M. Wattjes","doi":"10.24294/irr.v5i2.1752","DOIUrl":"https://doi.org/10.24294/irr.v5i2.1752","url":null,"abstract":"Background: Multiple sclerosis is often a longitudinal disease continuum with an initial relapsing-remitting phase (RRMS) and later secondary progression (SPMS). Most currently approved therapies are not sufficiently effective in SPMS. Early detection of SPMS conversion is therefore critical for therapy selection. Important decision-making tools may include testing of partial cognitive performance and magnetic resonance imaging (MRI). Aim of the work: To demonstrate the importance of cognitive testing and MRI for the prediction and detection of SPMS conversion. Elaboration of strategies for follow-up and therapy management in practice, especially in outpatient care. Material and methods: Review based on an unsystematic literature search. Results: Standardized cognitive testing can be helpful for early SPMS diagnosis and facilitate progression assessment. Annual use of sensitive screening tests such as Symbol Digit Modalities Test (SDMT) and Brief Visual Memory Test-Revised (BVMT-R) or the Brief International Cognitive Assessment for MS (BICAMS) test battery is recommended. Persistent inﬂammatory activity on MRI in the first three years of disease and the presence of cortical lesions are predictive of SPMS conversion. Standardized MRI monitoring for features of progressive MS can support clinically and neurocognitively based suspicion of SPMS. Discussion: Interdisciplinary care of MS patients by clinically skilled neurologists, supported by neuropsychological testing and MRI, has a high value for SPMS prediction and diagnosis. The latter allows early conversion to appropriate therapies, as SPMS requires different interventions than RRMS. After drug switching, clinical, neuropsychological, and imaging vigilance allows stringent monitoring for neuroinﬂammatory and degenerative activity as well as treatment complications.","PeriodicalId":153727,"journal":{"name":"Imaging and Radiation Research","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1970-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115495972","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A dual-model-based inversion method for integrated aperture radiometer imaging 基于双模型的集成孔径辐射计成像反演方法

Imaging and Radiation Research Pub Date : 1970-01-01 DOI: 10.24294/irr.v2i1.1720

Jianfei Chen, Li Zhu, Yuehua Li

引用次数: 0