Abstract:
UNLABELLED:Szapiro D, Ghaye B, Willems V, et al. Evaluation of CT time-density curves of lower-limb veins. Invest Radiol 2001;36:164-169. RATIONALE AND OBJECTIVES:To evaluate time-density curves of the lower-limb veins for optimization of CT venography. METHODS:Fifty patients referred for chest CT were randomized into five equal groups. Five anatomic levels (abdomen, pelvis, proximal thigh, knee, and midcalf) were evaluated by a dynamic acquisition during 7 minutes. Computed tomography attenuation values of the veins, arteries, and adjacent muscles were measured for each level and plotted into curves versus time. Venous enhancement was also assessed qualitatively. RESULTS:Mean peak enhancement values of the inferior vena cava and the iliac, femoral, popliteal, anterior tibial, posterior tibial, and peroneal veins were, respectively, 112 +/- 16, 103 +/- 17, 93 +/- 23, 98 +/- 30, 112 +/- 28, 137 +/- 28, and 124 +/- 29 Hounsfield units. These were reached at 93 +/- 9.5, 129 +/- 15, 135 +/- 20, 147 +/- 57, 124 +/- 32, 123 +/- 17, and 123 +/- 18 seconds. Homogeneous opacification was obtained after 210 seconds. An optimal time window for CT venography was obtained between 210 and 240 seconds for the calf level and between 180 and 300 seconds for above-knee veins. CONCLUSIONS:For sequential CT venography, a caudocranial acquisition of the lower-limb veins, starting at 210 seconds, should allow optimal clot detection.
journal_name
Invest Radioljournal_title
Investigative radiologyauthors
Szapiro D,Ghaye B,Willems V,Zhang L,Albert A,Dondelinger RFdoi
10.1097/00004424-200103000-00005keywords:
subject
Has Abstractpub_date
2001-03-01 00:00:00pages
164-9issue
3eissn
0020-9996issn
1536-0210journal_volume
36pub_type
临床试验,杂志文章,随机对照试验abstract::Using cardiac-gated fast acquisition with multiple excitation (FAME), time curves of the cerebral aqueduct signals were derived in 19 healthy volunteers and 14 patients. A mean curve of the normal subjects was determined during systole. A relatively stable point of time was found at 270 msec after the R-wave supposed ...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-198911000-00004
更新日期:1989-11-01 00:00:00
abstract:PURPOSE:We sought to prospectively evaluate the image quality and visualization of the intracranial arteries using high spatial resolution contrast-enhanced magnetic resonance angiography (CE-MRA) at 3 T and to perform intraindividual comparison with time-of-flight (TOF) MRA and multislice CT angiography (CTA). MATERI...
journal_title:Investigative radiology
pub_type: 临床试验,杂志文章
doi:10.1097/01.rli.0000242835.00032.f5
更新日期:2006-11-01 00:00:00
abstract:RATIONALE AND OBJECTIVES:Ultrasound can cause destruction of microbubble contrast agents used to enhance medical ultrasound imaging. This study sought to characterize the dynamics of this interaction by direct visual observation of microbubbles during insonification in vitro by a medical ultrasound imaging system. MET...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-199812000-00004
更新日期:1998-12-01 00:00:00
abstract::The cytogenetic interactions of ionic (diatrizoate, ioxaglate) and nonionic (iohexol) contrast media (CM) with antineoplastic drugs cyclophosphamide (CPA) and carmustine (CARM) were evaluated in a rat bone marrow cell model. Male Wistar rats were anesthetized with a 6% chloral hydrate solution and divided into five gr...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-198805000-00011
更新日期:1988-05-01 00:00:00
abstract:OBJECTIVES:To determine the impact of slice thickness on semiautomatic lymph node analysis. MATERIALS AND METHODS:Thoracic multislice computed tomography (MSCT) of 46 patients with NSCLC were reconstructed at 1.0-, 3.0-, and 5.0-mm slice thickness. Two radiologists independently determined long and short axis diameter...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/RLI.0b013e3181c443e1
更新日期:2010-02-01 00:00:00
abstract::Fractures modeled in the dried skull indicate that the initial plane of computed tomography (CT) section contributes to the accuracy of three-dimensional (3D) images generated from two-dimensional (2D) CT data. The authors retrospectively analyzed seven clinical cases of tripod zygomatic fractures that were imaged wit...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-199105000-00009
更新日期:1991-05-01 00:00:00
abstract::Blood samples from previous contrast reactors and nonreactor controls were incubated with diatrizoate and several contrast analogues. Total complement levels were assayed. All the agents caused complement activation generally proportional to their concentration. Reactors' sera responded to lower concentrations of cont...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-198307000-00018
更新日期:1983-07-01 00:00:00
abstract:RATIONALE AND OBJECTIVES:Dynamic contrast enhanced (DCE) MR mammography (MRM) uses tumor capillary density differences for prognosis. The heterogeneous response of permeability-surface area products (PS = Kp<-->t) was examined in mammary tumors, as a function of contrast agent size, to determine what effect ROI size mi...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-200204000-00003
更新日期:2002-04-01 00:00:00
abstract:OBJECTIVES:To evaluate the potential of quantitative assays of vascular characteristics based on dynamic contrast-enhanced magnetic resonance imaging (MRI) using a macromolecular contrast medium (MMCM) to search for and measure effects of dimethyl sulfoxide (DMSO) on cancer vasculature with microscopic correlations. M...
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:Hypertonic X-ray contrast media induce morphologic changes in red blood cells (RBCs) and reduce their deformability when measured in vitro. This study investigated whether RBCs treated with hypertonic contrast media could induce circulatory as well as metabolic disturbances in vivo. METHODS:Au...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:
更新日期:1993-09-01 00:00:00
abstract:RATIONALE AND OBJECTIVES:To develop a computer-assisted analysis of complex joint motion based on standard fluoroscopic sequences. MATERIALS AND METHODS:Fluoroscopic sequences of 10 normal shoulders and 20 patients after total shoulder arthroplasty were recorded during abduction and adduction. The analysis of the shou...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-200202000-00004
更新日期:2002-02-01 00:00:00
abstract:RATIONALE AND OBJECTIVES:The authors analyze the origins of the "clotting issue," the controversy that began in the 1980s when contrast media, once perceived as good flushing agents for catheters because of their assumed anticoagulant properties, came under attack for allegedly causing thromboembolism. Laboratory studi...
journal_title:Investigative radiology
pub_type: 杂志文章,评审
doi:
更新日期:1993-11-01 00:00:00
abstract::We investigated the feasibility of using intravascular ultrasound imaging to analyze vascular physiology in various arterial beds. Canine superficial femoral, external iliac, and common carotid arteries were harvested and suspended and perfused in a bath of oxygenated, heated, physiologic salt solution. A 6-Fr, 20-MHz...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-199103000-00010
更新日期:1991-03-01 00:00:00
abstract:OBJECTIVES AND RATIONALE:Negative enhancement of implanted liver tumors has been achieved in preclinical studies on manganese dipyridoxal-diphosphate (Mn-DPDP), a new hepatobiliary specific contrast agent for magnetic resonance imaging (MRI). The authors investigated the effects of Mn-DPDP on primary liver cancer and i...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-199306000-00011
更新日期:1993-06-01 00:00:00
abstract::Observation of the relaxivity of MRI contrast media over a wide range of magnetic fields is not only necessary for predicting their efficiency at any field but also compulsory for understanding and improving their mechanisms of action. The best experimental approach to this problem is the field cycling method, which a...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-198809001-00047
更新日期:1988-09-01 00:00:00
abstract:RATIONALE AND OBJECTIVES:Emulsions of perfluorocarbons (PFCs) have been tested as blood substitutes. However, evidence exists that there is long-term retention of some PFCs by the organs of the reticuloendothelial system (RES). The authors investigate organ retention of the blood substitute component, perfluorotripropy...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-199208000-00012
更新日期:1992-08-01 00:00:00
abstract::A method and associated algorithm are presented which allow a simple and accurate determination to be made of the location of small symmetric areas presented in roentgenological images. The method utilizes an operator to visually spot object positions but eliminates the need for critical positoning accuracy on the ope...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-197603000-00007
更新日期:1976-03-01 00:00:00
abstract:OBJECTIVES:The aims of this study were to assess the discriminative performance of quantitative multiparametric magnetic resonance imaging (mpMRI) between prostate cancer and noncancer tissues and between tumor grade groups (GGs) in a multicenter, single-vendor study, and to investigate to what extent site-specific dif...
journal_title:Investigative radiology
pub_type: 杂志文章,多中心研究
doi:10.1097/RLI.0000000000000558
更新日期:2019-07-01 00:00:00
abstract::We have examined the effect of dose on contrast medium-induced reductions in glomerular filtration in anesthetized rabbits. The fraction of renal plasma flow that is filtered, the filtration fraction, was directly measured by the renal arteriovenous difference method using technetium-99m (99mTc) (Sn) DTPA as the trace...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-198309000-00007
更新日期:1983-09-01 00:00:00
abstract::At a given radiation dosage and field of view, five variables are under meaningful control for intravenous digital subtraction angiography (IV-DSA): concentration and quantity of contrast media injected, volume of injectate, rate of injection, and site of injection. Some controversy exists regarding the selection of a...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-198401000-00007
更新日期:1984-01-01 00:00:00
abstract::Although general suggestions have been made regarding a radiology residency curriculum, no specific list of entities has been offered. Over the past ten years, we have developed a resident-run morning conference in musculoskeletal radiology that is supervised by faculty and covers a specific curriculum. We offer our c...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-199111000-00019
更新日期:1991-11-01 00:00:00
abstract::The authors report a randomized, double-blind prospective trial comparing the effects of nonionic with ionic low-osmolar contrast media on erythrocyte aggregation. The study group comprised 40 consecutive patients with pathology necessitating selective angiography. Patients were examined using either ioxaglate 320, io...
journal_title:Investigative radiology
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1097/00004424-199108000-00009
更新日期:1991-08-01 00:00:00
abstract::The issue of dechelation (transmetallation) in vivo after administration of the linear gadolinium-based contrast agents, and potential safety concerns, is considered on the basis of an extensive, focused literature review. Early indications of potential problems included the high level of excess ligand used in the for...
journal_title:Investigative radiology
pub_type: 杂志文章,评审
doi:10.1097/RLI.0000000000000507
更新日期:2018-10-01 00:00:00
abstract:OBJECTIVES:To evaluate the performance of black-blood diffusion-weighted (DW)-EPI sequences with parallel imaging for the detection of focal liver lesions in comparison with a standard T2-weighted (T2-w) sequence. MATERIALS AND METHODS:Twenty patients with known or suspected focal liver lesions underwent liver MRI usi...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/RLI.0b013e31816200b5
更新日期:2008-04-01 00:00:00
abstract:RATIONALE AND OBJECTIVES:The basic characteristics of BR1, a novel echo contrast agent based on stabilized sulfur hexafluoride (SF6) microbubbles have been evaluated. METHODS:The authors determined the physicochemical properties (bubble concentration, bubble size distribution, resistance to pressure, and stability) an...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-199508000-00001
更新日期:1995-08-01 00:00:00
abstract:OBJECTIVES:Altered systolic blood flow in the ascending aorta has been correlated with increased aortic growth in patients with bicuspid aortic valves (BAVs). We used conventional, 2-dimensional (2D) phase contrast magnetic resonance imaging (PC-MRI) to assess the relationship between altered flow and future growth in ...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/RLI.0000000000000064
更新日期:2014-10-01 00:00:00
abstract:RATIONALE AND OBJECTIVES:Low-field magnetic resonance imaging (MRI) evaluation of breast implants is described, with emphasis on the capabilities provided by different imaging sequences. METHODS:Open architecture MR images using a .064-T permanent magnet and three-dimensional Fourier transform and inversion recovery s...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-199408000-00009
更新日期:1994-08-01 00:00:00
abstract:RATIONALE AND OBJECTIVES:The authors report on the development and preliminary validation of a technique for measuring contrast-to-noise ratio (CNR) at all points along selected vessel segments in the original three-dimensional magnetic resonance angiography (MRA) dataset. METHODS:Contrast-to-noise ratio dependencies ...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-199311000-00005
更新日期:1993-11-01 00:00:00
abstract::Comparatively new in the roentgen evaluation of infants and children, xerography would appear to be ideal for portraying the pediatric airway. Since the radiation dose of xerography is higher than conventional radiography, its image quality is the subject of careful scrutiny in a pediatric setting here described in 23...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-197807000-00002
更新日期:1978-07-01 00:00:00
abstract:OBJECTIVES:The aim of this study was to evaluate the effect of structured reports (SRs) in comparison to nonstructured, free-text (FT) rectal magnetic resonance imaging (MRI) reports in patients with histologically proven rectal cancer and potential effects of both types of reporting on referring surgeons' satisfaction...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/RLI.0000000000000336
更新日期:2017-04-01 00:00:00