Abstract:
:Dense cavitary "photopenia" was observed on 21 of 200 consecutive stress perfusion scintigrams. A prominent finding in many cases, it sometimes occupied only a portion of the region overlying the ventricular cavity, was often seen in some projections and not others, and was frequently adjacent to myocardial perfusion defects. To distinguish an etiology among reduced cavitary radioactivity, relatively increased background radioactivity, or reduced radioactivity in overlying myocardium, quantitative analysis of cavitary, lung and myocardial radioactivity was performed in patients with dense cavitary "photopenia," with and without lung uptake, and compared with results from studies showing increased lung uptake without cavitary photopenia and with normal studies. The results showed that dense cavitary photopenia was related to reduced radioactivity in overlying myocardium. Correlative imaging studies performed with echocardiography and contrast ventriculography confirmed this relationship to myocardial scar in 15 of 21 patients in whom associated akinesis or dyskinesis was seen. Hence, dense cavitary photopenia on stress perfusion scintigraphy is due to a dense myocardial perfusion abnormality, and is often indicative of related scar and an associated severe contraction abnormality.
journal_name
Invest Radioljournal_title
Investigative radiologyauthors
Dae M,Canhasi B,Botvinick E,Olvera S,Schechtmann N,Engelstad B,Hattner R,Schiller N,O'Connell W,Faulkner Ddoi
10.1097/00004424-198507000-00009subject
Has Abstractpub_date
1985-07-01 00:00:00pages
388-92issue
4eissn
0020-9996issn
1536-0210journal_volume
20pub_type
杂志文章abstract::Three methods are presented which provide statistically acceptable estimates of mean transit time of opacified blood during angiography. While the methods vary in precision, the selection of the method appropriate for any particular experimental model depends on the degree of precision required to demonstrate the effe...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-197707000-00004
更新日期:1977-07-01 00:00:00
abstract:OBJECTIVE:This study aims for targeted biopsy validation of magnetic resonance fingerprinting (MRF) and diffusion mapping for characterizing peripheral zone (PZ) prostate cancer and noncancers. MATERIALS AND METHODS:One hundred four PZ lesions in 85 patients who underwent magnetic resonance imaging were retrospectivel...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/RLI.0000000000000569
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abstract:OBJECTIVES:We sought to assess large bowel motility, induced by 2 prokinetic agents, senna tea and erythromycin, using functional cine magnetic resonance imaging (MRI). MATERIALS AND METHODS:Twelve volunteers underwent functional cine MRI before and after the administration of senna tea or erythromycin. The protocol c...
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pub_type: 杂志文章
doi:10.1097/01.rli.0000183054.43131.a8
更新日期:2005-11-01 00:00:00
abstract::Proton magnetic resonance (MR) spectroscopy with homonuclear editing was used to assess lactate accumulation in ischemic and anoxic hearts perfused according to the Langendorff method. An increase in the lactate signal was observed after 5 minutes of ischemia and after 10 to 20 minutes of anoxia. This study demonstrat...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-198708000-00004
更新日期:1987-08-01 00:00:00
abstract:OBJECTIVE:To investigate the feasibility of an 80-kVp protocol using a moderate concentration contrast material (MC-CM) for cerebral computed tomography angiography by comparison with a conventional 120-kVp protocol using a high concentration contrast material (HC-CM). MATERIALS AND METHODS:Attenuation values and sign...
journal_title:Investigative radiology
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doi:10.1097/RLI.0b013e31823076a4
更新日期:2012-02-01 00:00:00
abstract::A high-speed computed tomography (CT) scanner was used for measuring flow in a phantom and in the common carotid arteries of six dogs. The general ability of the scanner to assess flow using contrast media boluses was tested with the phantom. The validated simple concept was then used in the animals. The carotid blood...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-198712000-00008
更新日期:1987-12-01 00:00:00
abstract:RATIONALE AND OBJECTIVES:The objective is to assess the diagnostic accuracy and interobserver variability of multiphase 3D gadolinium-enhanced magnetic resonance angiography (3D-Gd-MRA) for assessment of abdominal and pelvic vascular disease. METHODS:In 41 patients from two different institutions multiphase 3D-Gd-MRA ...
journal_title:Investigative radiology
pub_type: 杂志文章,多中心研究
doi:10.1097/00004424-200201000-00005
更新日期:2002-01-01 00:00:00
abstract:BACKGROUND:Gadolinium leakage in ocular structures (GLOS) was recently observed in fluid-attenuated inversion recovery (FLAIR) images obtained the day after an initial gadolinium injection in stroke patients. The specificity of GLOS to stroke and its mechanisms remain unclear. OBJECTIVE:We investigated the factors ass...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/RLI.0000000000000757
更新日期:2021-01-19 00:00:00
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journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-198503000-00017
更新日期:1985-03-01 00:00:00
abstract:RATIONALE AND OBJECTIVES:To measure the hepatic uptake and biliary elimination kinetics of gadolinium (Gd)-EOB-DTPA in dogs. METHOD:Two groups of four beagles each were anesthetized and given an intravenous bolus of 25 mumol/kg or 250 mumol/kg of Gd-EOB-DTPA. Blood, hepatic bile, and urine were collected over 140 minu...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-199604000-00005
更新日期:1996-04-01 00:00:00
abstract::Radiolabeled ioversol was injected intravenously into two male and two female beagle dogs (6.7 to 10.4 kg) at two dose levels each (0.2 and 1.0 g I/kg). Blood levels of radioactivity were monitored at 2, 5, 10, 20, 40, 60, 90, and 120 minutes and at one and two days. Urine and feces were collected in metabolism cages ...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-198906001-00005
更新日期:1989-06-01 00:00:00
abstract:OBJECTIVES:The aim of this study was to assess the effectiveness of a model-based iterative reconstruction (MBIR) in improving image quality and diagnostic performance of ultralow-dose computed tomography (ULDCT) of the lung. MATERIALS AND METHODS:The institutional review board approved this study, and all patients pr...
journal_title:Investigative radiology
pub_type: 杂志文章
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更新日期:2012-08-01 00:00:00
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journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-199005000-00006
更新日期:1990-05-01 00:00:00
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journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/RLI.0000000000000436
更新日期:2018-04-01 00:00:00
abstract:RATIONALE AND OBJECTIVES:To evaluate the use of a new thrombus-specific ultrasound contrast agent, MRX-408, in the ultrasonic detection of thrombus in arteriovenous (AV) fistulae. METHODS:Six purpose-bred mongrels with two AV fistulae each were imaged with gray-scale ultrasound 7 weeks after graft implantation before ...
journal_title:Investigative radiology
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doi:10.1097/00004424-200001000-00010
更新日期:2000-01-01 00:00:00
abstract:RATIONALE AND OBJECTIVES:To test noninvasive inductive heating of implanted vascular stents as an alternative approach for reduction or prevention of neointimal hyperplasia. METHODS:Calorimetric pretests were performed to get an orientation on the different parameters of influence for inductive heating of stents. The ...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/01.rli.0000117881.42422.72
更新日期:2004-05-01 00:00:00
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journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/RLI.0000000000000459
更新日期:2018-10-01 00:00:00
abstract::The potential of magnetic resonance imaging (MRI) quantification of calcium for the evaluation of pulmonary nodules was investigated in simulated nodules. Calcium salts do not contain mobile protons and thus have no signal on MR proton images. To determine whether the absence of signal from partially calcified nodules...
journal_title:Investigative radiology
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doi:10.1097/00004424-198711000-00001
更新日期:1987-11-01 00:00:00
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更新日期:2007-04-01 00:00:00
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pub_type: 临床试验,杂志文章
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更新日期:2009-11-01 00:00:00
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journal_title:Investigative radiology
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doi:10.1097/00004424-200006000-00004
更新日期:2000-06-01 00:00:00
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journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/RLI.0b013e318164b71d
更新日期:2008-05-01 00:00:00
abstract:RATIONALE AND OBJECTIVES:The authors evaluate the use of magnetic resonance (MR) to image pulmonary perfusion in healthy controls and to detect pulmonary defects in patients with unilateral lung transplantation, using dynamic images after contrast administration. METHODS:Five patients with right lung transplantation a...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-199706000-00006
更新日期:1997-06-01 00:00:00
abstract::Previous work has shown that Fe3+, when administered in the proper dose and time sequence, increases the tumor uptake of gallium-67 (67Ga) while decreasing its uptake by normal tissues. The purpose of this series of experiments was to examine further the postulate that the false carrier effect is mediated at the cellu...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-198207000-00016
更新日期:1982-07-01 00:00:00
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journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/RLI.0000000000000223
更新日期:2016-03-01 00:00:00
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journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/RLI.0000000000000026
更新日期:2014-05-01 00:00:00
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journal_title:Investigative radiology
pub_type: 杂志文章
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更新日期:1990-03-01 00:00:00
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journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/RLI.0b013e31816b2f63
更新日期:2008-07-01 00:00:00
abstract::Pyrroxamide [N-(1-hydroxymethyl-2,3-dihydroxypropyl)-2,2,5,5-tetramethyl pyrrolidine-1-oxyl-3-carboxyamide] is a newly tested nonionic monomeric nitroxyl compound with demonstrated effectiveness for MRI contrast enhancement at doses as low as 10(-3) M. Pyrroxamide and its hydroxylamine metabolic derivative were tested...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-198808000-00013
更新日期:1988-08-01 00:00:00
abstract:OBJECTIVE:The aim of this study was to compare quantitative and semiquantitative parameters (signal-to-noise ratio [SNR], contrast-to-noise ratio [CNR], image quality, diagnostic confidence) from a standard brain magnetic resonance imaging examination encompassing common neurological disorders such as demyelinating dis...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/RLI.0000000000000256
更新日期:2016-08-01 00:00:00