American journal of physiologic imaging最新文献_第6页

The assessment of mucociliary clearance using monodisperse 99mTc-tagged red blood cells. 使用单分散99mtc标记红细胞评估纤毛粘膜清除率。

American journal of physiologic imaging Pub Date : 1991-01-01

U M Botha, W J Strydom, H D Brandt

引用次数: 0

Physiological considerations in imaging of lower extremity venous thrombosis. 下肢静脉血栓成像的生理考虑。

American journal of physiologic imaging Pub Date : 1991-01-01

T K Chaudhuri, S Fink, A Farpour

引用次数: 0

In vivo sodium-23 MRI in brain tumors: evaluation of preliminary clinical experience. 体内钠-23 MRI在脑肿瘤中的应用:初步临床经验评价。

American journal of physiologic imaging Pub Date : 1991-01-01

T Hashimoto, H Ikehira, H Fukuda, A Yamaura, O Watanabe, Y Tateno, R Tanaka, H E Simon

{"title":"In vivo sodium-23 MRI in brain tumors: evaluation of preliminary clinical experience.","authors":"T Hashimoto, H Ikehira, H Fukuda, A Yamaura, O Watanabe, Y Tateno, R Tanaka, H E Simon","doi":"","DOIUrl":"","url":null,"abstract":"In vivo sodium-23 magnetic resonance (MR) imaging in the head was performed in ten normal volunteers and six patients with brain tumors on a commercially available 1.5 Tesla whole-body MR system. Although sodium MR signal from the brain parenchyma could hardly be detected on routine spin echo (SE) pulse sequence, free induction decay (FID) image with echo time of 1.9 msec demonstrated MR signal in the normal brain tissue. On the other hand, extracellular sodium of cerebrospinal fluid, large venous sinus, and vitreous humor offered high sodium MR signal intensity due to the quantity of sodium and the relatively longer transverse relaxation time (50-60 msec) compared to that of intracellular sodium (less than a few msec). Strong signal was obtained in gliomas with superior contrast, though the delineation of the tumor tissue from edema was as difficult as when seen on proton T2 weighted SE image. Meningioma itself gave much less of a sodium MR signal compared to glioma. Peritumoral edema associated with meningioma showed a markedly high sodium MR signal which was more prominent adjacent to the tumor, although proton SE image revealed the peritumoral edema as homogeneous. Pathological tissues such as brain tumors and edema could be readily depicted as significantly high sodium-23 MR signal, apparently different from normal brain tissues. The current status of in vivo sodium MR imaging is discussed. The authors concluded that early clinical experience of in vivo sodium-23 MR imaging brought promising results in the evaluation of brain tumors and edema; otherwise, discrimination and quantification of multiple T2 components and the improvement of spatial resolution are desperately needed.(ABSTRACT TRUNCATED AT 250 WORDS)","PeriodicalId":76992,"journal":{"name":"American journal of physiologic imaging","volume":"6 2","pages":"74-80"},"PeriodicalIF":0.0,"publicationDate":"1991-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13028193","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

In vivo assessment of regional microvascular albumin leakage during E. coli septic shock in the baboon model. 狒狒大肠杆菌感染性休克模型中局部微血管白蛋白渗漏的体内评估。

American journal of physiologic imaging Pub Date : 1991-01-01

I C Dormehl, N Hugo, O Knoessen

引用次数: 0

Animal models in radiotracer design of a Tc-labelled myocardial perfusion imaging agent. tc标记心肌灌注显像剂放射性示踪剂设计中的动物模型。

American journal of physiologic imaging Pub Date : 1991-01-01

S A Mousa

引用次数: 0

Radiolabelled semisolid test meal clearance in the evaluation of esophageal involvement in scleroderma and Sjogren's syndrome. 放射标记半固体试验对硬皮病和干燥综合征食管受累的评价。

American journal of physiologic imaging Pub Date : 1991-01-01

O Geatti, B Shapiro, L M Fig, V Fossaluzza, R Franzon, S De Vita, F Giacomuzzi

{"title":"Radiolabelled semisolid test meal clearance in the evaluation of esophageal involvement in scleroderma and Sjogren's syndrome.","authors":"O Geatti, B Shapiro, L M Fig, V Fossaluzza, R Franzon, S De Vita, F Giacomuzzi","doi":"","DOIUrl":"","url":null,"abstract":"Esophageal involvement by scleroderma is frequent. Investigation by manometry or radiography is invasive and nonphysiological. Scintigraphy of the clearance of small radiolabelled liquid boluses in the supine position, while sensitive and noninvasive, may also be nonphysiological and does not allow the simultaneous determination of gastric emptying. We thus studied the esophageal clearance of a semisolid test meal ingested in the upright position. Forty-seven patients with scleroderma and 24 with Sjogren's syndrome were compared with ten normal controls and ten patients with gastric emptying abnormalities but no esophageal involvement. Results of scintigraphy were also correlated with manometry and contrast radiography. Quantitative evaluation of esophageal tracer retention at ten minutes postingestion was: (mean +/- SD), 2.8 +/- 1.0% in normals, 2.9 +/- 0.9% in gastric dysmotility, 4.8 +/- 2.9% in Sjogren's syndrome, and 22.3 +/- 25.0% in scleroderma; similar results were found at 20 and 60 minutes. The T 1/2 of gastric emptying was 47.1 +/- 5.7 minutes in normals, 95.9 +/- 25.3 minutes in gastric dysmotility, 62.9 +/- 19.5 minutes in Sjogren's syndrome, and 52.9 +/- 13.5 minutes in scleroderma. We conclude that esophageal clearance of a semisolid test meal is a sensitive index of esophageal dysmotility and correlates well with results from manometry and contrast radiography but is noninvasive and quantifiable. The simultaneous measurement of gastric emptying is also possible in many cases.","PeriodicalId":76992,"journal":{"name":"American journal of physiologic imaging","volume":"6 2","pages":"65-73"},"PeriodicalIF":0.0,"publicationDate":"1991-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12816939","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 indium-111-labeled transferrin to study plasma extravasation during endotoxin shock and the effects of the beta-2 agonist terbutaline. 使用111标记的转铁蛋白研究内毒素休克时血浆外渗和β -2激动剂特布他林的作用。

American journal of physiologic imaging Pub Date : 1991-01-01

H A Youssef, G H Sigurdsson, J T Christenson, A Owunwanne

{"title":"Use of indium-111-labeled transferrin to study plasma extravasation during endotoxin shock and the effects of the beta-2 agonist terbutaline.","authors":"H A Youssef, G H Sigurdsson, J T Christenson, A Owunwanne","doi":"","DOIUrl":"","url":null,"abstract":"Endotoxemia and sepsis are common causes of respiratory distress (ARDS), which is characterized by increased pulmonary vascular permeability to plasma proteins resulting in \"noncardiac pulmonary edema.\" The aim of this series was to study the effects of the beta-2 receptor agonist, terbutaline, on plasma extravasation in multiple organs, in sheep exposed to endotoxin shock. A double isotope technique was used and the radioactivity was recorded in different organs (lungs, liver, spleen, kidneys, intestine) by a computerized gamma camera. Tc-99m-labeled erythrocytes were used as a marker for intravascular volume and In-111m-labeled transferrin for tracing extravascular plasma leakage. An organ-transferrin index (organ-TI) was calculated for each organ which corrects for changes in blood distribution. Fourteen sheep were anesthetized and ventilated. After stabilization (t = 0) all animals received E. coli endotoxin 10 micrograms/kg by IV infusion during 30 min. At t = 30, seven animals (group T) received IV infusion of terbutaline, 20 micrograms/kg/hr, during 4 h, while the other seven received normal saline and served as controls (group E). The endotoxin infusion caused an immediate and significant increase in the transferrin index in the lungs and in the liver in both groups. The transferrin index continued to rise in the control group towards the end of the experiment (t = 240), while in group T it reached a maximum 60 min after endotoxin. Four hours after endotoxin the transferrin index was significantly higher in the controls than in the terbutaline treated group, both in the lungs and in the liver (P less than 0.01). No significant changes were recorded in the kidneys or over the intestine.(ABSTRACT TRUNCATED AT 250 WORDS)","PeriodicalId":76992,"journal":{"name":"American journal of physiologic imaging","volume":"6 2","pages":"85-9"},"PeriodicalIF":0.0,"publicationDate":"1991-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13028195","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

ECG-gated and static technetium-99m-SESTAMIBI planar myocardial perfusion imaging: a comparison with thallium-201 and study of observer variabilities. 心电图门控和静态锝-99m- sestamibi平面心肌灌注显像:与铊-201的比较及观察变量的研究。

American journal of physiologic imaging Pub Date : 1990-01-01

J F Verzijlbergen, M J Cramer, M G Niemeyer, C A Ascoop, E E Van der Wall, E K Pauwels

{"title":"ECG-gated and static technetium-99m-SESTAMIBI planar myocardial perfusion imaging: a comparison with thallium-201 and study of observer variabilities.","authors":"J F Verzijlbergen, M J Cramer, M G Niemeyer, C A Ascoop, E E Van der Wall, E K Pauwels","doi":"","DOIUrl":"","url":null,"abstract":"To assess the diagnostic accuracy of planar diastolic and static Technetium-99m-SESTAMIBI, myocardial perfusion imaging at rest and during exercise, was performed in 60 consecutive patients. The results were compared with coronary angiographic findings, obtained within 3 months of the exercise test and Thallium-201 images, obtained on the same day and to the same exercise level as Technetium-99m-SESTAMIBI exercise. Exact segmental concordance between static Technetium-99m-SESTAMIBI and Thallium-201 was 77% and between the diastolic images and Thallium-201 76%. Concordance between static and diastolic images was 92%. Nineteen percent of all 900 segments demonstrated ischemia with both static and diastolic Technetium-99m-SESTAMIBI and 20% with Thallium-201. Overall sensitivity to detect hemodynamically significant coronary artery disease with static Technetium-99m-SESTAMIBI was 86%, specificity 78%, with diastolic images 89% and 70% and with Thallium-201 89% and 78% (differences not significant). Vessel-specific comparative detection rates revealed no statistical significant differences between both radiopharmaceuticals as well. Intra-observer variability for the static images was 12%, for the diastolic images 21% and Thallium-201 14%. Inter-observer variability for the static images was 14%, diastolic images 24%, and Thallium-201 17%. Although the physical characteristics of Tc-SESTAMIBI enable to perform high-count density imaging and electrocardiographic gating, no significant differences are found when planar diastolic and static Technetium-99m-SESTAMIBI images are compared with Thallium-201 and are well within observer variabilities.","PeriodicalId":76992,"journal":{"name":"American journal of physiologic imaging","volume":"5 2","pages":"60-7"},"PeriodicalIF":0.0,"publicationDate":"1990-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13301784","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

Carbon-13 NMR imaging study of in-vivo glucose metabolism. 体内葡萄糖代谢的碳-13核磁共振成像研究。

American journal of physiologic imaging Pub Date : 1990-01-01

H Ikehira, T Hashimoto, H Fukuda, Y Ueshima, S Yamai, T Maki, T A Iinuma, Y Tateno

引用次数: 0

Assessment of the dynamics of allograft rejection utilizing Tc-99m labeled lymphocytes. 利用Tc-99m标记淋巴细胞评估同种异体移植排斥动力学。

American journal of physiologic imaging Pub Date : 1990-01-01

J L Tatum, J I Hirsch, T S Burke, U R Prasad, J T Thompson

引用次数: 0