Aktuelle Radiologie最新文献_第10页

[Monostotic Paget's disease as differential diagnosis in osteolysis of the tibia]. 【单性Paget病作为胫骨溶骨症的鉴别诊断】。

Aktuelle Radiologie Pub Date : 1997-07-01

C Zwicker, M Hering, W Jünnemann

引用次数: 0

[Studies of image quality and dose in digital subtraction angiography]. 数字减影血管造影中图像质量和剂量的研究。

Aktuelle Radiologie Pub Date : 1997-07-01

H Heckmann, K F Kamm, S Vetter, E P Strecker, H P Busch

{"title":"[Studies of image quality and dose in digital subtraction angiography].","authors":"H Heckmann, K F Kamm, S Vetter, E P Strecker, H P Busch","doi":"","DOIUrl":"","url":null,"abstract":"Methods: The dose needed for high image quality in l.a. DSA, was determined by investigation of the necessary relationship between dose and image quality. This method is based on measurements of the signal-to-noise ratio and of the contrast-detail detectability. It has been tested on two different systems (Philips integris V3000, Philips Diagnost 97).Results: Our measurements prove that an image intensifier entrance dose of 1.1 microGy (image intensifier diameter 38 cm) is sufficient for high image quality in DSA. An increased dose value does not lead to an improvement in image information. For details larger than the pixel size the 512 matrix produces a higher signal-to-noise ratio with a higher contrast-detail detectability, whereas higher spatial resolution results by the use of a 1024 matrix. In rotational angiography, high image quality can be achieved at an image intensifier entrance dose of 1.1 microGy. In contrast to sequences without rotation, image quality is decreased through movement unsharpness. As the maximum exposure time 25 ms should be selected. The use of a 1024 matrix does not lead to a better spatial resolution in rotational angiography.","PeriodicalId":76986,"journal":{"name":"Aktuelle Radiologie","volume":"7 4","pages":"205-11"},"PeriodicalIF":0.0,"publicationDate":"1997-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"20272882","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

[Vertebral body metastases: characteristic MRI findings in epidural infiltration]. [椎体转移:硬膜外浸润的特征性MRI表现]。

Aktuelle Radiologie Pub Date : 1997-07-01

A Hutzelmann, S Palmié, M Freund

{"title":"[Vertebral body metastases: characteristic MRI findings in epidural infiltration].","authors":"A Hutzelmann, S Palmié, M Freund","doi":"","DOIUrl":"","url":null,"abstract":"Purpose: In case of lumbar vertebral metastasis associated with anterior epidural carcinomatous infiltration, we have observed that infiltrations tend to respect the midline. This study led to the systematic recognition of these phenomena in vertebral metastases.Materials and methods: 11 patients with 17 vertebral metastases and adjacent anterior epidural infiltration were reviewed retrospectively. All cases were studied by MRI. The routinely used imaging technique included spin echo (SE) T1 and T2 weighted sequences in the sagittal plane native and T1-SE without and with Gd-DTPA in the axial planes. The radiological findings of these phenomena and the anatomy were studied.Results: We observed these phenomena to be uni- or bilateral in 88.3% of all cases with intraspinal anterior epidural carcinomatous infiltration, especially in that part of the vertebral body where the basal vertebral venous plexus was located.Conclusion: We conclude that vertebral metastases respect the midline. We interpret this fact as being due the anatomy of the vertebral body and especially its stabilization by the posterior longitudinal ligament. These findings may be helpful in the differential diagnosis of vertebral body metastases with epidural infiltration in contrast to intraspinal processes which proceed with the destruction of the vertebral body.","PeriodicalId":76986,"journal":{"name":"Aktuelle Radiologie","volume":"7 4","pages":"169-72"},"PeriodicalIF":0.0,"publicationDate":"1997-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"20273581","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

[Pulmonary artery stenosis in aggressive mediastinal fibrosis; diagnosis and 3D imaging with helical CT examination]. 侵袭性纵隔纤维化肺动脉狭窄;螺旋CT诊断及三维成像]。

Aktuelle Radiologie Pub Date : 1997-07-01

M Kolbe, A Helwig, J M Habicht, W Steinbrich

引用次数: 0

[Comparison of film-screen combination in a contrast detail diagram and with interactive image analysis. 1: Contrast detail diagram]. [用对比细节图对比电影-屏幕组合，并结合交互式图像分析。1:对比细部图]。

Aktuelle Radiologie Pub Date : 1997-07-01

G Hagemann, G Eichbaum

{"title":"[Comparison of film-screen combination in a contrast detail diagram and with interactive image analysis. 1: Contrast detail diagram].","authors":"G Hagemann, G Eichbaum","doi":"","DOIUrl":"","url":null,"abstract":"The following three film-screen combinations were compared: a) a combination of anticrossover film and UV-light emitting screens, b) a combination of blue-light emitting screens and film, and c) a conventional green fluorescing screen film combination. Radiographs of a specially designed plexiglass phantom (0.2 x 0.2 x 0.12 m3) were obtained that contained bar patterns of lead and plaster (calcium sulfate) to test high and intermediate contrast resolution and bar patterns of air to test low contrast resolution, respectively. An aluminum step wedge was integrated to evaluate dose-density curves of the radiographs. The dose values for the various step thicknesses were measured as percentage of the dose value in air for 60, 81, and 117 kV. Exposure conditions were the following: 12 pulse generator, 0.6 mm focus size, 4.7 mm aluminum prefilter, a grid with 40 lines/cm (12:1), and a focus-detector distance of 1.15 m. The thresholds of visible bars of the various pattern materials were assessed by seven radiologists, one technician, and the authors. The resulting contrast detail diagram could not prove any significant differences between the three tested screen film combinations. The pairwise comparison, however, found 8 of the 18 paired differences to be statistically significant between the conventional and the two new screen-film combinations. The authors concluded that subjective visual assessment of the threshold in a contrast detail study alone is of only limited value to grade image quality if no well-defined criteria are used (BIR report 20 [1989] 137-139). The statistical approach of paired differences of the estimated means appeared to be more appropriate.","PeriodicalId":76986,"journal":{"name":"Aktuelle Radiologie","volume":"7 4","pages":"212-5"},"PeriodicalIF":0.0,"publicationDate":"1997-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"20272883","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

[Dependence of axis deviation in the esophagram on computerized tomography determined wall thickness and its value in assessing depth of invasion of esophageal carcinoma]. [食管造影轴向偏移与计算机断层扫描的相关性决定管壁厚度及其在评估食管癌浸润深度中的价值]。

Aktuelle Radiologie Pub Date : 1997-07-01

T Hackländer, E Ziegenhahn, E Katoh, R M Jungblut, U Mödder

{"title":"[Dependence of axis deviation in the esophagram on computerized tomography determined wall thickness and its value in assessing depth of invasion of esophageal carcinoma].","authors":"T Hackländer, E Ziegenhahn, E Katoh, R M Jungblut, U Mödder","doi":"","DOIUrl":"","url":null,"abstract":"Purpose: In this study we compared the abnormalities of the esophageal axis seen in the esophagogram with the thickness of the esophageal wall measured by computed tomography. We have investigated, how exactly both methods assess the local tumor invasion according to the TNM criteria and whether there is a relation between the esophageal axis and the wall thickness.Methods: In a retrospective study we examined the esophagograms of 65 tumor patients. Computed tomography examinations were available in 40 cases. Using a graphical method the wall thickness was transferred to the esophagograms under consideration of the different scales of the images.Results: There is no correlation between the different types of distortion of the esophageal axis and the wall thickness in computed tomography. However, it can be demonstrated that the distortion results from specific fixation effects with the surrounding tissue.Conclusions: Both radiological methods cannot determinate the tumor invasion correctly.","PeriodicalId":76986,"journal":{"name":"Aktuelle Radiologie","volume":"7 4","pages":"173-8"},"PeriodicalIF":0.0,"publicationDate":"1997-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"20273582","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

[Severe obliteration of the urethral lumen after wall stent implantation. An unusual radiographic finding]. 尿道内支架植入术后尿道腔严重闭塞。一个不寻常的x线影像发现]。

Aktuelle Radiologie Pub Date : 1997-07-01

A Ragozzino, G Testa, R de Ritis, A Diettrich, M Tuccillo

引用次数: 0

[Castleman lymphoma: isolated abdominal involvement with an 8-year course in a child]. [Castleman淋巴瘤:孤立的腹部累及，病程8年的儿童]。

Aktuelle Radiologie Pub Date : 1997-07-01

H Strunk, P Gutjahr, J Textor

引用次数: 0

[Soft tissue emphysema as manifestation of perforating diverticulitis]. [软组织肺气肿是穿孔性憩室炎的表现]。

Aktuelle Radiologie Pub Date : 1997-07-01

R Andresen, D R Meyer, D Banzer