Abstract:
:Frequency spectral analysis of cardiac wall motion as calculated from the recorded video kymogram are demonstrated. Characteristic harmonics following the fundamental frequency of the cardiac rate have been demonstrated to have an alternating sequential energy distribution as measured from the free margin of the left ventricle of humans. The characteristic patterns occur in approximately 80% of the 50 patients evaluated. The correlation of these harmonics with physiologic events is not yet complete. Amplitude frequency spectral analysis offers an objective method for analysis of cardiac kymography not otherwise possible.
journal_name
Invest Radioljournal_title
Investigative radiologyauthors
Silverman NR,Rosen L,Helland DRdoi
10.1097/00004424-197503000-00005keywords:
subject
Has Abstractpub_date
1975-03-01 00:00:00pages
124-31issue
2eissn
0020-9996issn
1536-0210journal_volume
10pub_type
杂志文章abstract:OBJECTIVES:The aim of this study was to investigate the impact of a novel iterative denoising and image enhancement technique in T1-weighted precontrast and postcontrast volume-interpolated breath-hold examination (VIBE) of the abdomen on image quality, noise levels, and diagnostic confidence without change of acquisit...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/RLI.0000000000000746
更新日期:2020-11-18 00:00:00
abstract:RATIONALE AND OBJECTIVES:To evaluate the efficacy of oral administration of cilostazol, an antithrombotic agent, for the prevention of thrombotic occlusion and intimal hyperplasia after stenting. METHODS:Single-bodied Z-stents were placed in the iliac arteries of 23 dogs. Before stenting, an embolizing coil was introd...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-199509000-00004
更新日期:1995-09-01 00:00:00
abstract:OBJECTIVES:The aim of this study was to quantify image quality gains of a moving coronary plaque phantom using dual-source computed tomography (DSCT) providing 83 milliseconds temporal resolution in direct comparison to 64 slice single-source multidetector CT (MDCT) with a temporal resolution of 165 milliseconds. MATE...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/01.rli.0000254409.79193.96
更新日期:2007-03-01 00:00:00
abstract::The purpose of this study was to establish the proton NMR relaxation times of collapsed but otherwise normal lung tissue and to determine whether an inflammatory process within a collapsed lung can be detected by alterations in relaxation times. The lungs of three groups of rabbits were studied: group A (n = 7) had a ...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-198508000-00004
更新日期:1985-08-01 00:00:00
abstract:RATIONALE AND OBJECTIVES:To demonstrate the usefulness of a model of the parenchymous vascularization to evaluate texture analysis methods. METHODS:Slices with thickness varying from 1 to 4 mm were reformatted from a 3D vascular model corresponding to either normal tissue perfusion or local hypervascularization. Param...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-199903000-00004
更新日期:1999-03-01 00:00:00
abstract::The authors correlated sonographic findings with histologic findings in a rabbit model of osteomyelitis. Staphylococcus aureus osteomyelitis was induced in the femora of 11 New Zealand white rabbits. The opposite leg was used as a control. Sonographic findings showed fluid adjacent to the bone in 11 cases. The fluid w...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-199202000-00002
更新日期:1992-02-01 00:00:00
abstract::Various water soluble contrast media (WSCM) were injected subcutaneously into 970 hind feet of 485 rats. Gross morphologic changes were seen after the injection and analyzed as a function of various physicochemical characteristics of WSCM. The WSCM of larger volume, higher osmolality, higher iodine content, and meglum...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-199006000-00011
更新日期:1990-06-01 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
abstract:OBJECTIVE:To evaluate the effectiveness of a dual magnetic resonance-near infrared fluorescence optical imaging agent, poly(l-glutamic acid)-DTPA-Gd-NIR813, for both preoperative and intraoperative visualization and characterization of sentinel lymph nodes (SLN) in mice. MATERIALS AND METHODS:Poly(L-glutamic acid) was...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/RLI.0b013e31804f5a79
更新日期:2007-08-01 00:00:00
abstract:RATIONALE AND OBJECTIVES:Ureteric jet index (UJI), a newly developed technique derived from color Doppler ultrasonography, may hold promise in evaluating renal function because of its ability to evaluate individual renal function and the use of nonionizing radiation. To assess the usefulness of UJI, the authors in this...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-199908000-00001
更新日期:1999-08-01 00:00:00
abstract:OBJECTIVES:Imaging of the kidney using blood oxygen level dependent MR presents a major opportunity to examine differences in tissue oxygenation within the cortex and medulla applicable to human disease. We sought to define the differences between regions within kidneys and to optimize selection of regions of interest ...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/RLI.0b013e3181b4c1e8
更新日期:2009-09-01 00:00:00
abstract::Intravenous or intra-aortic injections of meglumine iothalamate in dogs indicate a slightly different tissue distribution and excretory pattern of the meglumine cation and the iothalamate anion. Differences in serum and urinary concentrations of these ions suggest some cellular penetration of the meglumine anion. In a...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-197507000-00004
更新日期:1975-07-01 00:00:00
abstract:RATIONALE AND OBJECTIVES:To evaluate the feasibility of mechanical thrombectomy in occluded hemodialysis access shunts by using a newly developed 5F pigtail rotation catheter. METHODS:Thrombosed hemodialysis access shunts were simulated by clotted bovine blood in silicone tubing (diameter 6 mm). After retrograde and a...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-199907000-00008
更新日期:1999-07-01 00:00:00
abstract:OBJECTIVES:We compared the image quality and diagnostic performance of 2 fat-suppression methods for black-blood T2-weighted fast spin-echo (FSE), which are as follows: (a) short T1 inversion recovery (STIR; FSE-STIR) and (b) spectral adiabatic inversion recovery (SPAIR; FSE-SPAIR), for detection of acute myocardial in...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/RLI.0b013e3182718672
更新日期:2013-01-01 00:00:00
abstract:OBJECTIVES:The authors assessed the relative efficacy of conventional and digital storage-phosphor radiographs for the detection of skull fractures. METHODS:Fifty conventional film-screen radiographs (FSR) and 50 digital storage-phosphor radiographs (DR) with 66 fractures were compared. Five radiologists evaluated ima...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-199308000-00005
更新日期:1993-08-01 00:00:00
abstract:OBJECTIVE:The objective of this study was to evaluate a high spatial resolution 3-dimensional (3D) contrast-enhanced magnetic resonance (CE-MR) venography protocol for evaluation of intracranial venous system using highly accelerated parallel imaging at 3.0 T. MATERIALS AND METHODS:Ten patients (4 male, 6 female; age,...
journal_title:Investigative radiology
pub_type: 临床试验,杂志文章
doi:10.1097/01.rli.0000236992.21065.04
更新日期:2006-10-01 00:00:00
abstract::Prior studies of the opacification-phase effects of left ventricular (LV) injection of angiographic contrast medium (CM) on LV size and function have yielded discrepant results. A sensitive ultrasonic technique was used to measure LV dimension (Di) in 10 open-chest dogs with physiologic heart rates, and injection of s...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-198209000-00009
更新日期:1982-09-01 00:00:00
abstract:PURPOSE:The aim of this study was to develop a method to delineate the lethally frozen-tissue region (temperature less than -40°C) arising from interventional cryoablation procedures using a short tau inversion-recovery ultrashort echo-time (STIR-UTE) magnetic resonance (MR) imaging sequence. This method could serve as...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/RLI.0000000000000642
更新日期:2020-05-01 00:00:00
abstract:RATIONALE AND OBJECTIVES:The purpose of this study was to determine whether cerebral fat embolism demonstrated reversible or irreversible findings in magnetic resonance (MR) imaging over time and to compare the features in MR images with histologic findings in a cat model. MATERIALS AND METHODS:MR images were obtained...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/01.rli.0000077055.48406.e2
更新日期:2003-10-01 00:00:00
abstract:OBJECTIVES:Over the recent years, there have been increasing concerns that exposure to gadolinium-based contrast agents (GBCAs) may be associated with retention of Gd within the skin, bones, and solid organs in patients with normal renal function, although the clinical implications of this deposition remain to be estab...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/RLI.0000000000000657
更新日期:2020-07-01 00:00:00
abstract::Breast calcification diagnosis was studied by using clinical findings and computerized image processing of a mammogram in a network of trained expert learning systems (Outcome Advisor [OA]). The system was tested with records not used for training and performance was compared with radiologist. The network was 72% accu...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-199106000-00004
更新日期:1991-06-01 00:00:00
abstract:RATIONALE AND OBJECTIVES:Gd-DTPA is a well-characterized, safe contrast agent frequently used in magnetic resonance imaging (MRI) of the central nervous system. The purpose of this double-blind, comparative MRI study of brain, spine, trunk, and limbs was to evaluate the safety and efficacy of Gd-DOTA versus Gd-DTPA in ...
journal_title:Investigative radiology
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1097/00004424-199502000-00002
更新日期:1995-02-01 00:00:00
abstract:RATIONALE AND OBJECTIVES:The purpose of this study evaluating a cesium iodide-amorphous silicon-based flat-panel detector was to optimize the x-ray spectrum for chest radiography combining excellent contrast-detail visibility with reduced patient exposure. MATERIALS AND METHODS:A Lucite plate with 36 drilled holes of ...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/01.rli.0000138091.96320.f8
更新日期:2004-10-01 00:00:00
abstract::Percutaneous injection of absolute ethanol into adenocarcinomas implanted in the hind leg of rats was evaluated as a potential cancer treatment. Intramuscular alcohol injections up to 10 mL/kg produced a local dose-dependent coagulation necrosis followed by granulation tissue formation and subsequent fibrosis but no a...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-198706000-00005
更新日期:1987-06-01 00:00:00
abstract:RATIONALE AND OBJECTIVES:Because of the complex relationships between the dynamic three-dimensional cardiac surface shape and its projected image, errors arise with the use of two-dimensional silhouettes to measure displacements of the heart. The character and frequency of such errors are examined. METHODS:A high-prec...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-199403000-00004
更新日期:1994-03-01 00:00:00
abstract:RATIONALE AND OBJECTIVES:This study assesses the ability of a cardiac-gated phase-contrast magnetic resonance imaging (MRI) technique to measure renal blood flow (RBF) noninvasively in humans. METHODS:In nine normal volunteers, total RBF in the renal arteries and in the left renal vein was estimated by MRI and correla...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-199206000-00012
更新日期:1992-06-01 00:00:00
abstract:RATIONALE AND OBJECTIVES:To evaluate the effect of the transverse ligament on translation of the menisci. METHODS:Six cadaveric knees were examined by MR imaging inside a positioning device before and after transecting the transverse ligament. The knees were examined at various positions: extension, 30 degrees of flex...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-199909000-00002
更新日期:1999-09-01 00:00:00
abstract:RATIONALE AND OBJECTIVES:To evaluate the imaging characteristics of various iliac artery stents and stent-grafts in a multislice, computed tomography angiography (MSCTA) phantom study. METHODS:Twelve types of stents and three stent-grafts made of different materials (steel, nitinol, tantalum, cobalt-based alloy) were ...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-200112000-00004
更新日期:2001-12-01 00:00:00
abstract:OBJECTIVE:Dynamic ventilation (3)He-MRI is a new method to assess pulmonary gas inflow. As differing airway diameters throughout the ventilatory cycle can influence gas inflow this study intends to investigate the influence of volume and timing of a He gas bolus with respect to the beginning of the tidal volume on insp...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/RLI.0b013e3181690111
更新日期:2008-06-01 00:00:00
abstract:RATIONALE AND OBJECTIVES:The authors conduct technical feasibility and performance studies on a new 0.009-inch nitinol microguidewire for potential neuroendovascular applications. METHODS:In vivo microcatheterizations of brachiocephalic arteries were performed in four pigs using the 0.009-inch nitinol microguidewire w...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-199704000-00008
更新日期:1997-04-01 00:00:00