Abstract:
RATIONALE AND OBJECTIVES:To develop a new automated calibration method for vessel measurements in vascular x-ray images. METHODS:Radiopaque marker bands mounted equidistantly on a small catheter were acquired in vitro at five image intensifier (II) sizes in x-ray projection images. The positions of the marker centers were detected by using a Hough transform and were computed at subpixel precision by using either a novel, iterative center-of-gravity approach (CGA) or a symmetry filter. Curve-fitting procedures were used to reject false-positive marker detections and to calculate intermarker distances. The calibration factor was calculated from the true marker distance and the average of the measured distances in pixels. Results were compared statistically with a grid calibration method, which was taken as the gold standard. A simulation study was performed to assess the influence of image noise on the CGA method. RESULTS:The iterative CGA method was convergent and faster than the symmetry-based technique. For four II sizes (17, 20, 25, and 31 cm), the results from the CGA method were not significantly different from the results obtained with grid calibration. For the II size of 38 cm, a significant difference (0.3% of the grid calibration factor) was found; however, this was caused by the quantification error in the image data and was not clinically relevant. In general, the performance of the CGA method improved with increasing signal-to-noise ratio. CONCLUSIONS:A practical new calibration method for small catheter sizes was developed and validated for quantitative vascular arteriography.
journal_name
Invest Radioljournal_title
Investigative radiologyauthors
Van Assen HC,Vrooman HA,Egmont-Petersen M,Bosch HG,Koning G,Van Der Linden EL,Goedhart B,Reiber JHdoi
10.1097/00004424-200004000-00002keywords:
subject
Has Abstractpub_date
2000-04-01 00:00:00pages
219-26issue
4eissn
0020-9996issn
1536-0210journal_volume
35pub_type
杂志文章abstract:RATIONALE AND OBJECTIVES:A new hepatobiliary gadolinium chelate, gadolinium (Gd) 2,5-BPA-DO3A, was compared in two animal species with Gd HP-DO3A (gadoteridol), a clinically approved extracellular contrast agent, and Gd Cy2-DOTA, a second hepatobiliary chelate in preclinical development. The ligand in Gd 2,5-BPA-DO3A i...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-199601000-00003
更新日期:1996-01-01 00:00:00
abstract::We have examined the metabolic behavior of several triiodobenzoic acid derivatives because of the observed mutagenicity and cytotoxicity of 3-amino-5-acetamido-2,4,6-triiodobenzoate (I) and 3,5-diamino-2,4,6-triiodobenzoate (II). Measurements were facilitated using iodine-131 (131I)-labeled compounds. Drug retention i...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:
更新日期:1981-11-01 00:00:00
abstract:RATIONALE AND OBJECTIVES:To assess the abilities of dynamic diffusion-weighted MRI to demonstrate the effects in vivo of a high-viscosity iodinated contrast agent on medullary and cortical blood flow in the rat kidney. METHODS:Dynamic diffusion-weighted, echoplanar MR images obtained from five b-value single-shot acqu...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-200011000-00001
更新日期:2000-11-01 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:OBJECTIVES:The objective of this study was to assess the feasibility of the combination of magnetic resonance (MR)-guided biopsy (MRGB) and diagnostic 3T MR imaging in the localization of local recurrence of prostate cancer (PCa) after external beam radiation therapy (EBRT). MATERIALS AND METHODS:Twenty-four consecuti...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/RLI.0b013e3181c7bcda
更新日期:2010-03-01 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::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::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...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-198211000-00007
更新日期:1982-11-01 00:00:00
abstract:PURPOSE:To evaluate the technical feasibility of high spatial resolution contrast-enhanced magnetic resonance angiography (CE-MRA) with highly accelerated parallel acquisition at 3.0 T using a 32-channel phased array coil, and a high relaxivity contrast agent. MATERIALS AND METHODS:Ten adult healthy volunteers (5 men,...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/01.rli.0000261937.77365.6a
更新日期:2007-06-01 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:As part of a general examination of the effect of blood flow patterns on the growth and risk of rupture of abdominal aortic aneurysms, the authors investigated the flow through an experimental model of a fusiform aneurysm. MATERIALS AND METHODS:Aneurysms were simulated in polyvinyl chloride tu...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-199207000-00008
更新日期:1992-07-01 00:00:00
abstract::Thromboembolic complications occurring during angiography may result from a number of different causes. Catheters and guidewires can interact with blood to form thrombi; this tendency is related to wall defects and the chemical composition and structural characteristics of the catheters and guidewires. Nonthrombic sou...
journal_title:Investigative radiology
pub_type: 杂志文章,评审
doi:10.1097/00004424-198811002-00009
更新日期:1988-11-01 00:00:00
abstract:RATIONALE AND OBJECTIVES:To establish a pig model suitable for imitating pulmonary emboli to facilitate research in the diagnosis of pulmonary embolism. METHODS:Thirteen animals were anesthetized, mechanically ventilated, and subjected to pulmonary artery catheterization initiated from the right external jugular vein....
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-200005000-00003
更新日期:2000-05-01 00:00:00
abstract:OBJECTIVES:Demonstrate the usability of a new polyetheretherketone (PEEK)-based MR-compatible guidewire for renal artery catheterization, angioplasty, and stenting under MR-guidance using MR-visible markers, in vitro and in vivo. MATERIAL AND METHODS:The new 0.035'' guidewire with fiber-reinforced PEEK core, a soft ti...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/RLI.0b013e31819b00f1
更新日期:2009-04-01 00:00:00
abstract::Gastrografin and Amipaque with identical iodine content and flavoring were orally administered in 100 ml doses to 10 healthy volunteers in a double-blind crossover study. The nonionic Amipaque has only about one third of the osmolality of Gastrografin, and draws less fluid into the bowel lumen. Consequently there is l...
journal_title:Investigative radiology
pub_type: 临床试验,杂志文章
doi:10.1097/00004424-197811000-00008
更新日期:1978-11-01 00:00:00
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:RATIONALE AND OBJECTIVES:The authors used gadolinium (Gd) chelate as a T1, T2, and T2* enhancing agent in reperfused myocardial infarction to compare the appearance of reperfused myocardial infarction on spin echo and gradient echo magnetic resonance (MR) sequences. METHODS:Rats (n = 28) were subjected to reperfused m...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-199807000-00002
更新日期:1998-07-01 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::Chest radiographs are commonly obtained to assess children for bronchiolitis, both to corroborate the diagnosis and to exclude other diagnostic possibilities. Their utility in this setting has not previously been examined. Using a blinded, randomized study design, we examined the interobserver and intraobserver variat...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-199102000-00004
更新日期:1991-02-01 00:00:00
abstract::Due to the nature of three-dimensional Fourier transform (3-DFT) data acquisition in magnetic resonance imaging (MRI), the spatial relation between a resolved volume element (a voxel) and the object can be manipulated easily. Those manipulations have practical consequences in terms of registering slice positions with ...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-199012000-00006
更新日期:1990-12-01 00:00:00
abstract:RATIONALE AND OBJECTIVES:The aim of the study was to determine optimal thresholds for semiquantitative perfusion parameters and to evaluate the influence of different segmentation models in detecting malperfused regions. MATERIAL AND METHODS:In 6 healthy subjects and 13 patients with coronary artery disease, contrast-...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/01.rli.0000133816.83192.38
更新日期:2004-09-01 00:00:00
abstract::Trypan blue and 197HgCl2 were used as markers of the increased leakage through the blood-brain barrier which developed after selective injection of different contrast media formulations into the internal carotid arteries of rabbits. Interest was focused on a new, experimental, nonionic medium (C-29) and possible effec...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-197907000-00007
更新日期:1979-07-01 00:00:00
abstract::An isotopic radiation source 125I was investigated for use in soft tissue radiaography, with particular attention to possible use in mammography for mass screening. Film sensitivities, exposure rates, absorbed doeses, contrast and resolution were determined, and compared to conventional x-ray units. It was found that ...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-197509000-00007
更新日期:1975-09-01 00:00:00
abstract:OBJECTIVE:The aim of this study was to evaluate the potential of iterative metal artifact reduction (IMAR) for the improvement of computed tomography (CT)-based position emission tomography (PET) attenuation correction in the vicinity of metal implants and compare it with dual-energy-based metal artifact reduction stra...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/RLI.0000000000000306
更新日期:2017-01-01 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::Recent publications of the magnetic resonance safety profile of neurostimulators, cardiac pacemakers, and other implanted devices imply that these devices are no longer a contraindication for magnetic resonance imaging. It is very promising that patients who have these implanted devices may in the future no longer be ...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/01.rli.0000185898.59140.91
更新日期:2005-12-01 00:00:00
abstract:OBJECTIVES:The aim of this study was to compare F-fluorodeoxyglucose (FDG) positron emission tomography (PET)/magnetic resonance (MR) (with and without diffusion-weighted imaging [DWI]) to F-FDG PET/computed tomography (CT), with regard to the assessment of nodal and extranodal involvement, in patients with Hodgkin lym...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/RLI.0000000000000218
更新日期:2016-03-01 00:00:00
abstract::The contrast sensitivity of the retina is greatest in the center and decreases rapidly toward the periphery. Therefore, the detection of low-contrast lung nodules depends upon the manner in which the image is sampled by retinal receptors as eye fixations jump across the image during scanning. The scanning performance ...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-198705000-00010
更新日期:1987-05-01 00:00:00
abstract::A patient, suffering a severe anaphylactoid reaction to contrast material injected for an intravenous pyelogram, developed a consumption coagulopathy and evidence of complement activation. Precontrast complement values suggested that the patient had been processing complement via the classical pathway, perhaps as a co...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-198011001-00004
更新日期:1980-11-01 00:00:00
abstract::The authors investigated the effect on the brain of red blood cells that had been modified by contrast media. Rat blood was mixed with an equivolume of contrast media, and up to 200 microL of the mixture was infused to the internal carotid artery of the rat. Evans blue was administered intravenously to assess the inte...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-198905000-00009
更新日期:1989-05-01 00:00:00