Abstract:
RATIONALE AND OBJECTIVES:The authors differentiate breast lesions on sonography by measurements in two compression states that are perpendicular to each other. METHODS:Diameters of 100 breast lesions were measured preoperatively under lateromedial and craniocaudal compression with a new sonographic method. This method uses mammography-identical positioning of the breast and a reference structure for detection of changes of sound amplitude and velocity by through transmission of lesions. Sizes parallel to sound propagation were corrected for abridgement by increased velocity within some lesions. For each lesion, an average length and breadth was calculated by adding sizes parallel and perpendicular to sound propagation in the two compression states and dividing it by 2. An average ratio was calculated for each lesion by dividing the average size perpendicular to sound propagation by the corrected average size along sound propagation. After obtaining histopathologic results, a threshold of ratios and other features that might help differentiate benign from malignant lesions were studied. RESULTS:Ninety-six percent of the malignant lesions appeared with ratios < or = 1.2, whereas 92% of the benign lesions had a ratio > 1.2. Further differentiation is possible by observation of velocity in lesions with ratios > 1.2. CONCLUSIONS:Examination of lesions in two compression states that are perpendicular to each other allows discrimination of benign and malignant masses by measurements in most patients.
journal_name
Invest Radioljournal_title
Investigative radiologyauthors
Richter K,Willrodt RG,Opri F,Heywang-Köbrunner SHdoi
10.1097/00004424-199607000-00003subject
Has Abstractpub_date
1996-07-01 00:00:00pages
401-14issue
7eissn
0020-9996issn
1536-0210journal_volume
31pub_type
杂志文章abstract:RATIONALE AND OBJECTIVES:High signal intensity in the basal ganglia on T1-weighted MR imaging has been reported in chronic manganese (Mn) poisoning. However, the exact meaning of the high signal intensity remains unclear: does it result from Mn itself, secondary pathologic changes of the brain tissue, or both? The goal...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-199906000-00001
更新日期:1999-06-01 00:00:00
abstract:OBJECTIVES:The aim of this study was to investigate the impact on metal artifacts and dose efficiency of using a tin filter in combination with high-energy threshold (TH) images of a photon-counting detector (PCD) computed tomography (CT) system. MATERIALS AND METHODS:A 3D-printed spine with pedicle screws was scanned...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/RLI.0000000000000535
更新日期:2019-04-01 00:00:00
abstract::Groups of 5 fasting male and female patients aged 32-83 years were each given 3 gm of the cholecystographic contrast medium iosumetic acid in micronized form (particle size less than 20 mum); Group I with 150 ml tea (standard administration); Group II with 500 ml tea; Group III with 150 ml tea plus 10 mg metocloprami...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-197607000-00009
更新日期:1976-07-01 00:00:00
abstract:RATIONALE AND OBJECTIVES:Tissue contrast phenomenology was investigated analytically and clinically for a class of magnetic resonance (MR) pulse sequences we call large-tip-angle (LTA) spin-echo (SE) imaging. In comparison to traditional SE sequences (denoted 90 degrees-180 degrees-echo), the LTA sequence is of the for...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-199310000-00017
更新日期:1993-10-01 00:00:00
abstract::A new technique for the noninvasive measurement of an index of renal blood flow is described. The method utilizes ultrasound determined renal volume and radionuclide assessment of the mean transit time of a pertechnetate bolus through the kidneys. From this information a value for flow is calculated according to compa...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-198307000-00009
更新日期:1983-07-01 00:00:00
abstract:RATIONALE AND OBJECTIVES:The authors assessed whether a non-sleep-deprived, second-year diagnostic radiology resident assigned to an after-hours "night stalker" emergency radiology (ER) rotation in an urban university hospital has a measurable impact on the number and clinical significance of "missed" radiologic findin...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-199301000-00032
更新日期:1993-01-01 00:00:00
abstract::Thoracic metastases from squamous carcinoma and adenocarcinoma of the cervix were studied by reviewing 245 consecutive cases to describe comparative incidence, natural history, and radiographic patterns. The incidence of chest metastases was higher for adenocarcinoma (20%) than for squamous carcinoma (4%). Few patient...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-198003000-00004
更新日期:1980-03-01 00:00:00
abstract:OBJECTIVES:Magnetic resonance-guided high-intensity focused ultrasound (MR-HIFU) is a method to heat lesions noninvasively to a stable, elevated temperature and a well-suited method to induce local hyperthermia (41°C-43°C) in deep-seated tissues. Magnetic Resonance (MR) imaging provides therapy planning on anatomical i...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/RLI.0000000000000392
更新日期:2017-10-01 00:00:00
abstract:OBJECTIVE:To investigate the correlation between intravoxel incoherent motion (IVIM) model-derived parameters and histologically determined microvascularity in pancreatic ductal adenocarcinomas (PDACs) and pancreatic neuroendocrine tumors (PNETs). MATERIALS AND METHODS:From April 2013 to May 2014, 42 patients with mal...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/RLI.0000000000000187
更新日期:2015-11-01 00:00:00
abstract:OBJECTIVE:To evaluate the degree of ischemic changes of the small intestine after arterial embolization of proximal or distal arteries with Gelfoam particles and coils in dogs. METHODS:Superselective arterial embolization in 18 dogs was performed using a coaxial catheter system. Gelfoam occlusion of the proximal level...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-199910000-00004
更新日期:1999-10-01 00:00:00
abstract:OBJECTIVES:In late December 2019, an outbreak of coronavirus disease (COVID-19) in Wuhan, China was caused by a novel coronavirus, newly named severe acute respiratory syndrome coronavirus 2. We aimed to quantify the severity of COVID-19 infection on high-resolution chest computed tomography (CT) and to determine its r...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/RLI.0000000000000674
更新日期:2020-06-01 00:00:00
abstract:RATIONALE AND OBJECTIVES:The suitability of paramagnetic complexes as magnetic resonance contrast agents depends on various factors such as their relaxivity, stability, selectivity, and the inertness toward transmetallation by endogenous ions. The transmetallation of a series of 18 gadolinium complexes by the Zn2+ ion ...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-200102000-00008
更新日期:2001-02-01 00:00:00
abstract::A technique to measure absolute arterial blood flow in ml/min has been developed utilizing software programs with high-speed digital recording for the off-line analysis of intra-arterial injections of contrast medium. Measurements of pulsatile flow in a phantom for a physical flow model showed that calculations with t...
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::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:RATIONAL AND OBJECTIVES:The purpose of this study was to evaluate the effects of variation in design parameters on the resultant radial force. We evaluated the influence of wire gauge, leg length, and number of bends on the radial force produced by z stents and compared these with radial forces produced by commercial s...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-200109000-00004
更新日期:2001-09-01 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::The magnitude and time course of contrast enhancement in spontaneous canine brain tumors was determined for two contrast agents: meglumine iothalamate and sodium meglumine ioxaglate. Tumor enhancement during contrast infusion and at 5, 10, 15, 30 and 45 minutes was measured using quantitative computed tomography. Bloo...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-198411001-00007
更新日期:1984-11-01 00:00:00
abstract:RATIONALE AND OBJECTIVES:To present the results of two studies conducted to evaluate the pharmacokinetics and safety of iomeprol in healthy volunteers and in patients with various degrees of renal impairment. METHODS:In these two open-label, single-dose, phase I studies, a 50-mL dose of iomeprol 400 was administered i...
journal_title:Investigative radiology
pub_type: 临床试验,杂志文章
doi:10.1097/00004424-200106000-00002
更新日期:2001-06-01 00:00:00
abstract::The hardcopy recording technologies of video cameras, slow-scan (digital spot) recorders, and laser film printers are presented and compared. Slow-scan (digital spot) recorders offer a few advantages when compared with multiformat video cameras. But only laser film printers provide the high-quality hardcopy recordings...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-199102000-00017
更新日期:1991-02-01 00:00:00
abstract:PURPOSE:The aim of this study was to identify the signal intensity (SI) changes in the dentate nucleus (DN) and the globus pallidus (GP) on unenhanced T1-weighted magnetic resonance (MR) images after multiple administration of gadolinium-based contrast agents (GBCAs) in children and compare those changes between linear...
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:OBJECTIVES:The purpose of this study was to develop and validate a computer-aided diagnosis (CAD) tool for automatic classification of pulmonary nodules seen on low-dose computed tomography into solid, part-solid, and non-solid. MATERIALS AND METHODS:Study lesions were randomly selected from 2 sites participating in t...
journal_title:Investigative radiology
pub_type: 临床试验,杂志文章,多中心研究,随机对照试验
doi:10.1097/RLI.0000000000000121
更新日期:2015-03-01 00:00:00
abstract:OBJECTIVES:The purpose of our study was to assess the potential for radiation dose reduction in digital postinterventional digital mammograms after marker placement. MATERIALS AND METHODS:One hundred consecutive cases of marker placement (hook-wire localization or postbiopsy clip marker placement), with 200 full-field...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/01.rli.0000163743.63063.9f
更新日期:2005-06-01 00:00:00
abstract:OBJECTIVES:Transcatheter arterial embolization (TAE) is used for the treatment of patients with malignant liver tumors. However, the proangiogenesis effect of TAE-associated hypoxia has not been adequately studied. The goal of this study was to determine angiogenic activity in tumors subjected to TAE by evaluating the ...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/01.rli.0000209663.00629.8a
更新日期:2006-06-01 00:00:00
abstract:RATIONALE AND OBJECTIVES:Echogenic antibody-conjugated anionic liposomes have been developed that allow directed tissue targeting and acoustic enhancement. These are not efficient for gene delivery. A cationic formulation that allows directed gene delivery while retaining acoustic properties may provide more efficient ...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/00004424-200012000-00007
更新日期:2000-12-01 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::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::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:OBJECTIVES:The aim of this study was to evaluate the feasibility of a computed tomography (CT) protocol enabling the visualization of the prostatic artery (PA) before prostatic artery embolization (PAE) in benign prostatic hyperplasia, which provides quantitative perfusion information of the prostate gland. MATERIALS ...
journal_title:Investigative radiology
pub_type: 杂志文章
doi:10.1097/RLI.0000000000000582
更新日期:2019-10-01 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:RATIONALE AND OBJECTIVES:To compare gadobenate dimeglumine (Gd-BOPTA) with gadopentetate dimeglumine (Gd-DTPA) for magnetic resonance imaging of the liver. METHODS:The contrast agent Gd-BOPTA or Gd-DTPA was administered at a dose of 0.1 mmol/kg to 257 patients suspected of having malignant liver tumors. Dynamic phase ...
journal_title:Investigative radiology
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1097/00004424-200111000-00002
更新日期:2001-11-01 00:00:00