Abstract:
:The magnitude and timing of the effects of postural change on pulmonary blood flow distribution were studied in dogs by means of computed tomography (CT) and radioactive microspheres. A change in the mean attenuation values was demonstrated by CT in the anterior and posterior lung zones after change from the supine to the prone position. Similarly, a significant shift in blood flow distribution, as measured by microspheres, occurred rapidly, within 1 minute of the time of change from upright to supine position. These data confirm the importance of gravity in determining blood flow distribution in the lungs and demonstrate that maximum readjustments occur within 1 minute after postural change.
journal_name
Invest Radioljournal_title
Investigative radiologyauthors
Kuribayashi S,Garnic JD,Abrams HLdoi
10.1097/00004424-198211000-00007subject
Has Abstractpub_date
1982-11-01 00:00:00pages
561-6issue
6eissn
0020-9996issn
1536-0210journal_volume
17pub_type
杂志文章abstract:OBJECTIVE:The purpose of this study was to assess the diagnostic value and safety of the contrast agent gadoterate meglumine (Gd-DOTA, DOTAREM, Guerbet, Roissy CdG Cedex, France) in the setting of a postmarketing surveillance study. MATERIALS AND METHODS:Between January 2004 and October 2005, radiologists in 61 radiol...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/01.rli.0000248893.01067.e5
更新日期:2007-01-01 00:00:00
abstract:PURPOSE:The aim of this study was to compare qualitative and quantitative image quality and geometric distortion of 4 magnetic resonance diffusion-weighted imaging (DWI) sequences of the prostate using comparable imaging parameters and similar acquisition times. METHODS AND MATERIALS:Axial T2-weighted turbo spin echo ...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/RLI.0000000000000429
更新日期:2018-04-01 00:00:00
abstract:OBJECTIVES:Multidetector-row computed tomography coronary images are usually analyzed in mid-diastole (MD). Because of slow coronary motion also in end-systole (ES), we evaluated the impact on image quality of including ES images and defined an efficient reconstruction protocol. MATERIAL AND METHODS:In 50 coronary mul...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/01.rli.0000153930.34439.e4
更新日期:2005-03-01 00:00:00
abstract:OBJECTIVES:The aim of this study was to conduct a radiopathologic evaluation of right-angled traction bronchiectasis to differentiate idiopathic pulmonary fibrosis (IPF) without honeycombing from idiopathic nonspecific interstitial pneumonia (NSIP). MATERIALS AND METHODS:The derivation cohort included 78 consecutive p...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/RLI.0000000000000651
更新日期:2020-06-01 00:00:00
abstract:RATIONALE AND OBJECTIVES:The effect of varying exposure parameters on the detectability of a fracture with digital and conventional radiography were examined. METHODS:A macerated fractured skull was imaged by film-screen radiography (FSR) and digital storage phosphor radiography (DR) with various exposure values. Five...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-199303000-00010
更新日期:1993-03-01 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:RATIONALE AND OBJECTIVES:The authors detect activation in the auditory cortex during cochlear electrical stimulation in deaf patients using functional magnetic resonance (MR) imaging. METHODS:Stimulating electrode was inserted gently under local anesthesia close to the round window membrane of the cochlea in seven coc...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-199705000-00007
更新日期:1997-05-01 00:00:00
abstract:OBJECTIVES:To investigate image quality and interstudy reproducibility of aortic atherosclerosis imaging at 1.5 T, and to explore the impact of parallel imaging techniques at 3 T. MATERIALS AND METHODS:Institutional review board approval and informed consent were obtained. Thirty-two subjects (20 normal, 12 patients w...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/RLI.0b013e318181538a
更新日期:2008-09-01 00:00:00
abstract:OBJECTIVES:The incidence of coronary artery disease has been shown to be greater in patients with calcific deposits than in those without. It has been suggested that the pattern of distribution of coronary calcific deposits within coronary arteries is of greater predictive value for acute coronary events than the overa...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/RLI.0b013e3180cc2041
更新日期:2007-11-01 00:00:00
abstract::Eye position recordings made while radiologists searched chest images for lung nodules showed that regions falsely reported positive or suspicious received prolonged visual attention. Correlation of regional fixation dwell time with independent ratings of image features indicated that more than 90% of false-positive d...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:
更新日期:1989-06-01 00:00:00
abstract::An ultrasound phantom was constructed simulating fetal femurs in amniotic fluid. Bones of 26, 36, 50, 58, and 70 mm, representative of gestational ages ranging from 17 to 36 weeks, were scanned with mechanical sector, phased sector, and linear array systems (ATL, Diasonics, Acuson, and GE). Measurements were made with...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-198505000-00016
更新日期:1985-05-01 00:00:00
abstract:OBJECTIVES:The aim of this study was to assess quantitative ultra-high b-value (UHB) diffusion magnetic resonance imaging (MRI)-derived parameters in comparison to standard clinical apparent diffusion coefficient (SD-ADC-2b-1000, SD-ADC-2b-1500) for the prediction of clinically significant prostate cancer, defined as G...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/RLI.0000000000000712
更新日期:2021-02-01 00:00:00
abstract::The retropsoas recess, a previously undescribed normal anatomic variant, is reported. In most individuals, the space posterior to the belly of the psoas muscle contains fat within the posterior pararenal space. However, a retrospective review of 250 consecutive CT examinations of the abdomen revealed 11 cases (4.4%) i...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-198707000-00004
更新日期:1987-07-01 00:00:00
abstract::A considerable amount of concern has been felt recently for the risk of carcinogenesis from x-rays to scoliosis patients. This paper re-evaluates risk in quantitative terms by using some data measured by us and other data recently published in the literature. The risks are considerably smaller than had been estimated ...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-198401000-00014
更新日期:1984-01-01 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: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::Magnetic resonance angiography (MRA) for application in the musculoskeletal system is progressing at a rapid pace. The clinical role of this new technique is still being developed, although a number of uses have already become well recognized, and MRA is diffusing into clinical practice. This article describes the bas...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-199212002-00014
更新日期:1992-12-01 00:00:00
abstract:OBJECTIVES:The objective of this study was to evaluate the frequency and characteristics of artifacts in segmentation-based attenuation correction maps (μ-maps) of positron emission tomography/magnetic resonance (PET/MR) and their impact on PET interpretation and the standardized uptake value (SUV) quantification in no...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/RLI.0000000000000131
更新日期:2015-05-01 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::An allergic, immunologic mechanism for certain adverse reactions to radiocontrast agents has been postulated on the basis of clinical and theoretical considerations. One obstacle to the acceptance of this allergic theory has been the inability to demonstrate significant antibodies with specificity for these agents. In...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-197609000-00002
更新日期:1976-09-01 00:00:00
abstract:RATIONALE AND OBJECTIVES:The vasoconstriction of the renal arteries is frequently considered as a crucial factor for radiocontrast-induced nephropathy. A direct effect of iodinated radiographic contrast medium (RCM) on vascular smooth muscle is supposed to be one component of the vascular response. We studied the effec...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-200208000-00005
更新日期:2002-08-01 00:00:00
abstract:RATIONALE AND OBJECTIVES:Time-of-flight magnetic resonance angiography (TOF/MRA) is increasingly used to assess the nature and severity of stenotic blood vessels. Flow artifacts associated with high flows and/or narrow constrictions may confuse the interpretation of these studies. Accurate TOF/MRA evaluations demand an...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-199307000-00011
更新日期:1993-07-01 00:00:00
abstract::The importance of evaluating medical student performance has been widely addressed in the medical education literature. Multiple-choice examinations are the preferred method of testing because they are easy to administer and score. Development of parallel or equivalent pre- and post-examinations provides objective inf...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:
更新日期:1986-09-01 00:00:00
abstract::We evaluated the density distribution (anterior-posterior) of the right lung in 19 acutely anesthetized supine dogs using computed transmission tomography (CTT). Eleven dogs served as controls, and eight received 0.12 cc/kg of intravenously administered oleic acid. The latter were sequentially imaged over 1 hour. Nine...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:
更新日期:1984-05-01 00:00:00
abstract:PURPOSE:The aim of this study was to determine to what degree current compressed sensing methods are capable of accelerating clinical magnetic resonance neuroimaging sequences. METHODS:Two 2-dimensional clinical sequences were chosen for this study because of their long scan times. A pilot study was used to establish ...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/RLI.0b013e31828a012d
更新日期:2013-09-01 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::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:RATIONALE AND OBJECTIVES:Very small dextran-coated magnetite particles were developed. These particles can be used either as immunospecific contrast agents for MRI by coupling to antibodies or as an interstitial contrast agent. METHODS:The particles were synthesized from iron chloride/dextran solutions. Size was evalu...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-200009000-00006
更新日期:2000-09-01 00:00:00
abstract:OBJECTIVE:Cardiac magnetic resonance imaging (MRI) at 3.0 T has recently become available and potentially provides a significant improvement of tissue contrast in T1-weighted imaging techniques relying on Gd-based contrast enhancement. Imaging at high-field strength may be especially advantageous for methods relying on...
journal_title:Investigative radiology
pub_type: 临床试验,杂志文章
doi:10.1097/01.rli.0000233321.82194.09
更新日期:2006-09-01 00:00:00
abstract:OBJECTIVE:Commercially available iodinated contrast media (CM) show significantly different physico-chemical properties. The relevance of the viscosity of CM may be underestimated as a contributing factor for clinically relevant renal failure as suggested by a large registry data analysis (Swedish registry study). The ...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/RLI.0b013e318190fbd2
更新日期:2009-02-01 00:00:00