Imaging and Radiation Research最新文献_第4页

Computational ghost imaging study based on incoherent light from blackbody radiation 基于黑体辐射非相干光的计算鬼影成像研究

Imaging and Radiation Research Pub Date : 2001-11-22 DOI: 10.24294/irr.v5i1.1741

Guang Yang, Chunyu Sui, Tingting Jia, Zhan-Dong Liu, Zongguo Li, Hongguo Li

{"title":"Computational ghost imaging study based on incoherent light from blackbody radiation","authors":"Guang Yang, Chunyu Sui, Tingting Jia, Zhan-Dong Liu, Zongguo Li, Hongguo Li","doi":"10.24294/irr.v5i1.1741","DOIUrl":"https://doi.org/10.24294/irr.v5i1.1741","url":null,"abstract":"In recent years, ghost imaging has made important progress in the field of remote sensing imaging. In order to promote the application of solar ghost imaging in this field, this paper studies the computational ghost imaging based on the incoherent light of blackbody radiation. Firstly, according to the intensity probability density function of blackbody radiation, the expression of contrast-to-noise ratio (RCN) describing the quality of computational ghost imaging is obtained, and then the random speckle pattern simulating blackbody radiation is generated by computer with the idea of slice sampling, finally, a digital light projector is used to modulate and generate the random modulated light that simulates the blackbody radiation light source, and this light source is used to realize the computational ghost image of the reflective object in the experiment. The “ghost image” of the object under different measurement frame numbers is reconstructed, and the contrast-to-noise ratio describing the imaging quality is measured. The results show that the image quality is relatively good when the average intensity (gray) of the randomly modulated speckle is about 160. On the other hand, the contrast-to-noise ratio of the image gradually increases from 0.8795 to 1.241, 1.516, 1.755, 2.100 and 2.371 as the number of measurement frames increases from 2,000 to 4,000, 6,000, 8,000, 12,000 and 20,000, respectively. The experimental results are basically consistent with the theoretical analysis. The results are of great significance for the application of ghost imaging with incoherent light, such as sunlight, which is approximately regarded as blackbody radiation, in the field of remote imaging.","PeriodicalId":153727,"journal":{"name":"Imaging and Radiation Research","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131829047","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

Inter-examiner concordance of periodontal findings using conventional periapical radiography 常规根尖周x线检查牙周检查结果的一致性

Imaging and Radiation Research Pub Date : 2001-07-21 DOI: 10.24294/irr.v4i1.1729

M. Simancas-Pallares, Luisa Arévalo-Tovar, A. Díaz-Caballero

{"title":"Inter-examiner concordance of periodontal findings using conventional periapical radiography","authors":"M. Simancas-Pallares, Luisa Arévalo-Tovar, A. Díaz-Caballero","doi":"10.24294/irr.v4i1.1729","DOIUrl":"https://doi.org/10.24294/irr.v4i1.1729","url":null,"abstract":"Introduction: Periodontal disease affects more than half of the population in Colombia and is estimated to be one of the leading causes of oral morbidity. Diagnostic aids that allow the evaluation of its extension and severity are of importance since this will provide reliable tools to quantify the severity of the problem. Objective: To determine the inter-examiner agreement for the detection of radiographic findings in patients with localized chronic periodontitis using conventional periapical radiography. Methods: Study of diagnostic tests including patients with localized chronic periodontitis, the tooth with the worst clinical insertion level and a single conventional radiograph per dental organ using parallelism technique. The radiographic evaluations were performed by two independent and blinded evaluators for the findings: lamina dura, bone defects and type of defect. The agreement obtained was estimated through Cohen’s Kappa. Results: A total of 125 radiographs were taken. The mean age was 38.8 ± 9.9, and 61.6% were women. Concordance for lamina dura was 0.08 (95% CI: -0.04–0.21), bone defects 1.00 (95% CI: 1.00–1.00); type of defect present 0.31 (95% CI: 0.29–0.38). Conclusions: Concordance was evaluated as null, almost perfect and acceptable for the findings lamina dura, presence of bone defects and type of defect respectively. For some findings and given the importance of the diagnostic and therapeutic processes, more accurate evaluations are needed which would result in a higher degree of agreement.","PeriodicalId":153727,"journal":{"name":"Imaging and Radiation Research","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134477353","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

Imaging properties of radiative multi-sub mirror array structure 辐射多子镜阵列结构的成像特性

Imaging and Radiation Research Pub Date : 1970-01-01 DOI: 10.24294/irr.v2i1.1719

Xiaoyao Liu, Zhongcheng Liang, Weiqian Hao, Ruijuan Zhao, Meimei Kong, Tao Chen, Yue Zhang

{"title":"Imaging properties of radiative multi-sub mirror array structure","authors":"Xiaoyao Liu, Zhongcheng Liang, Weiqian Hao, Ruijuan Zhao, Meimei Kong, Tao Chen, Yue Zhang","doi":"10.24294/irr.v2i1.1719","DOIUrl":"https://doi.org/10.24294/irr.v2i1.1719","url":null,"abstract":"Based on the characteristics of liquid lens sparse aperture imaging, a radiative multiplet array structure is proposed; a simplified model of sparse aperture imaging is given, and the analytical expression of the modulation transfer function is derived from the optical pupil function of the multiplet array structure; the specific distribution form of this multiplet array structure is given, and the structure parameters are approximated by the dimensionless method; the two types of radiative multiplet array structures are discussed, and the filling factor, redundancy, modulation transfer function and other characteristic parameters are calculated. The physical phenomena exhibited by the parametric scan are discussed, and the structural features and imaging characteristics of these two arrays are compared. The results show that the type-II structure with larger actual equivalent aperture and actual cutoff frequency and lower redundancy is selected when the average modulation transfer function and the IF characteristics of the modulation transfer function of the two structures are close to each other; the type-II structure has certain advantages in imaging; the conclusion is suitable for arbitrary enclosing circle size because the liquid lens-based multiplet array structure adopts dimensionless approximation parameters; compared with the composite toroidal structure, the radiative multiplet mirror structure has a larger actual cut-off frequency and actual equivalent aperture when the filling factor is the same.","PeriodicalId":153727,"journal":{"name":"Imaging and Radiation Research","volume":"13 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":"125302622","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

Quantification of the distortion present in the postero-anterior skull radiograph 量化颅骨后前位x光片上出现的畸变

Imaging and Radiation Research Pub Date : 1970-01-01 DOI: 10.24294/irr.v4i1.1733

Janneth Rocío Zúñiga Prado, Elizabeth Peña Tobar, G. P. Baena-Caldas

{"title":"Quantification of the distortion present in the postero-anterior skull radiograph","authors":"Janneth Rocío Zúñiga Prado, Elizabeth Peña Tobar, G. P. Baena-Caldas","doi":"10.24294/irr.v4i1.1733","DOIUrl":"https://doi.org/10.24294/irr.v4i1.1733","url":null,"abstract":"Introduction: It is universally accepted that the posteroanterior skull radiograph shows a lower degree of distortion than other radiographic images, so that measurements on it are considered reliable. Objective: To determine the percentage of distortion in the different facial regions of the postero-anterior skull radiograph. Methods: Thirty human skulls with their jaws were divided by three horizontal and four vertical planes into fifteen quadrants; there were ten in the skull and five in the jaw. On each of them a steel wire was placed in vertical and horizontal positions and their length (actual measurement) was measured. Each set was X-rayed in posteroanterior projection and the length of the wires was measured in the image (radiographic measurement). Results: It was not possible to measure in the lateral quadrants of the skull. The horizontal measurement in the right and left lower intermediate quadrants of the skull and in the intermediate and lateral quadrants of both sides of the mandible is not reliable; in the median quadrant of the mandible it is minimized; in the right and left upper intermediate and median quadrants of the skull and in the median of the mandible it is magnified. Vertical measurements in all quadrants are reliable; in the right and left upper intermediate and left upper and middle quadrants of the skull and in the right and left middle and lateral quadrants of the mandible it is magnified; in the lower intermediate and upper and lower middle quadrants of the skull and median of the mandible it is minimized. The least distortion for both measurements occurs in the upper median quadrant of the skull. Percentages of distortion are reported for each quadrant. Conclusions: Distortion is present in the posteroanterior skull radiograph and varies from one region of the face to another.","PeriodicalId":153727,"journal":{"name":"Imaging and Radiation Research","volume":"17 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":"116721245","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

New imaging technologies for complex aortic aneurysms diagnosis and treatment 复杂主动脉瘤诊断与治疗的新影像技术

Imaging and Radiation Research Pub Date : 1970-01-01 DOI: 10.24294/irr.v3i1.1725

L. Ferreira, A. R. La Mura, J. Álvarez, Patricio Giménez Ruiz, Pablo Diluca, Eduardo Ehyeremendi

引用次数: 0

Structural discrepancy of the TMJ disc and joint capsule on magnetic resonance imaging. Literature review 颞下颌关节盘与关节囊在磁共振成像上的结构差异。文献综述

Imaging and Radiation Research Pub Date : 1970-01-01 DOI: 10.24294/irr.v5i2.1759

Anne-Marie Kusch, Abell Temistocles Sovero Gaspar

引用次数: 0

Initial approach to mediastinal alterations: Review of their radiographic anatomical references 纵隔改变的初步入路:对其放射学解剖学参考文献的回顾

Imaging and Radiation Research Pub Date : 1970-01-01 DOI: 10.24294/irr.v2i1.1716

Emmanuel Salinas Miranda, L. Cifuentes, Juan Gonzalo Vélez, B. Pinzón

引用次数: 0

Radiographic characteristics of dentigerous cysts diagnosed at the School of Stomatology of the Universidad Peruana Cayetano Heredia 秘鲁大学卡耶塔诺埃雷迪亚口腔医学院诊断的牙囊肿的放射学特征

Imaging and Radiation Research Pub Date : 1970-01-01 DOI: 10.24294/irr.v4i1.1735

Maria Alejandra Olaechea-Ramos, Alexis Evangelista-Alva, Milushka Quezada-Márquez

{"title":"Radiographic characteristics of dentigerous cysts diagnosed at the School of Stomatology of the Universidad Peruana Cayetano Heredia","authors":"Maria Alejandra Olaechea-Ramos, Alexis Evangelista-Alva, Milushka Quezada-Márquez","doi":"10.24294/irr.v4i1.1735","DOIUrl":"https://doi.org/10.24294/irr.v4i1.1735","url":null,"abstract":"Objective: To evaluate the radiographic characteristics of dentigerous cysts (DC) diagnosed at the School of Stomatology of the Universidad Peruana Cayetano Heredia (UPCH) during the period of 2010–2017. Material and methods: Retrospective, descriptive, observational and cross-sectional study, where the panoramic radiographs of 37 cases of DC were selected. Results: The total number of diagnosed cases of dentigerous cysts was 233, which after inclusion and exclusion criteria, 37 cases were obtained, of which 45.9% of cysts were found in the second decade of life with a higher frequency of 51.4 percent for women, and a jaw predilection of 59.5% in all cases. In addition, it was found that 97.3% of the cases were radiolucent, deﬁned limits were found in 67.6%, corticalized edges in 54.1% and unilocular in 94.6%. All dentigerous cysts were associated with a tooth, of which closed apex (48.6%) and tooth displacement (59.5%) were observed. The adjacent tooth was not affected in 56.8% of cases, but its hard lamina was affected (59.5%). The 68.2% of cases did not affect the basal mandibular cortex, but did displace the inferior dental canal (54.5%) and 46.7% of cases displaced the floor of the maxillary sinus. Conclusions: Most of the results obtained on the characteristics in the Peruvian population support previous studies reported in America, Europe and Asia. Radiographically the dentigerous cyst showed characteristics that support its clearly benign behavior.","PeriodicalId":153727,"journal":{"name":"Imaging and Radiation Research","volume":"19 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":"130056917","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

Use of image intensifier in the extraction of radiopaque foreign bodies in traumatology 图像增强器在创伤学不透射线异物提取中的应用

Imaging and Radiation Research Pub Date : 1970-01-01 DOI: 10.24294/irr.v2i1.1715

Gregorio Antonio Moreno Daza, Linda Beatriz Dávila Solórzano, Juan José Moreno Ortega, Franklin Emmanuel Moreno Moreno

{"title":"Use of image intensifier in the extraction of radiopaque foreign bodies in traumatology","authors":"Gregorio Antonio Moreno Daza, Linda Beatriz Dávila Solórzano, Juan José Moreno Ortega, Franklin Emmanuel Moreno Moreno","doi":"10.24294/irr.v2i1.1715","DOIUrl":"https://doi.org/10.24294/irr.v2i1.1715","url":null,"abstract":"In the present research work, we investigated the use of the image intensifier in the extraction of radiopaque foreign bodies in traumatology. First of all, it is necessary to clarify that this method constitutes an essential component of practically generalized use, in which low current level radiation is used, that is, fluoroscopic radiation, so that it can be applied for a considerably longer time than that of the longest radiographic exposure. This tool works with a tube intended for this purpose, which is known as fluoroscopy. The radiations from the tube pass through the patient and reach the serigraph, on which the image intensifier or fluoroscopic screen is mounted. In the latter case, this is where the chain ends, since it is on this screen that the image is formed and where the physician directly observes the region to be studied. It is also necessary to define that a foreign body is any element foreign to the body that enters it, either through the skin or through any natural orifice such as the eyes, nose, throat, preventing its normal functioning. It was possible to obtain as a result that the advantages of fluoroscopic navigation are the reduction of surgical time and the amount of irradiation, which goes from about 140 seconds without navigation to only 8 seconds, which is a substantial difference. Among the conclusions, it was possible to highlight that in the case of a radiopaque object, it is essential to have an image intensifier for localization of the foreign body during surgery; while in the case of a radiolucent foreign body, it is more advisable to locate it through the clinic, since these tend to form granulomas.","PeriodicalId":153727,"journal":{"name":"Imaging and Radiation Research","volume":"40 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":"126892135","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

Rationalization of radiation dose 辐射剂量合理化

Imaging and Radiation Research Pub Date : 1970-01-01 DOI: 10.24294/irr.v2i1.1714

Y. Nejaim, K. de Faria Vasconcelos, G. Roque-Torres, Abraham Meneses-López, F. Bóscolo, F. Haiter-Neto

{"title":"Rationalization of radiation dose","authors":"Y. Nejaim, K. de Faria Vasconcelos, G. Roque-Torres, Abraham Meneses-López, F. Bóscolo, F. Haiter-Neto","doi":"10.24294/irr.v2i1.1714","DOIUrl":"https://doi.org/10.24294/irr.v2i1.1714","url":null,"abstract":"Currently there is a great acceptance in medicine and dentistry that clinical practice should be “evidence-based” as much as possible. That is why multiple works have been published aimed at decreasing radiation doses in the different types of imaging modalities used in dentistry, since the greater effect of radiation, especially in children, forces us to take necessary measures to rationalize its use, especially with Cone Beam computed tomography (CBCT), the method that provides the highest doses in dentistry. This review was written using such an approach with the purpose of rationalizing the radiation dose in our patients. In order to formulate recommendations that contribute to the optimization of the use of ionizing radiation in dentistry, the SEDENTEXCT project team compiled and analyzed relevant publications in the literature, guidelines that have demonstrated their efficiency in the past, thus helping to see with different perspectives the dose received by patients, and with this, it is recommended taking into account this document so as to prescribe more adequately the complementary examinations that we use on a daily basis.","PeriodicalId":153727,"journal":{"name":"Imaging and Radiation Research","volume":"481 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":"133665892","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