Abstract:
:The effects of magnetic resonance (MR) pulse sequences and timing parameters on tumor-liver contrast were studied in an animal model of metastatic liver cancer. Six spin-echo (SE), three inversion-recovery (IR), and four gradient-echo (GRE) sequences were evaluated at 0.6 T before and after injection of super-paramagnetic iron oxide. GRE techniques, irrespective of echo time and flip angle, showed the greatest change in signal intensity (enhancement) of the liver after administration of iron oxide. Single-acquisition GRE sequences (16 seconds) matched the contrast-to-noise ratio (C/N) performance of the most effective 6.4-minute SE sequences. Multiexcitation GRE sequences showed tumor-liver C/Ns per unit time that were significantly (P less than .05) higher than those achieved with SE and IR sequences. GRE sequences, which recruit intravoxel dephasing as an additional source of transverse relaxation enhancement (T2*), show a higher C/N per unit time and in this respect seem superior to SE and IR sequences for MR imaging with superparamagnetic iron oxide.
journal_name
Radiologyjournal_title
Radiologyauthors
Fretz CJ,Elizondo G,Weissleder R,Hahn PF,Stark DD,Ferrucci JT Jrdoi
10.1148/radiology.172.2.2748820subject
Has Abstractpub_date
1989-08-01 00:00:00pages
393-7issue
2eissn
0033-8419issn
1527-1315journal_volume
172pub_type
杂志文章相关文献
RADIOLOGY文献大全abstract::The dynamics of white blood cell (WBC) and 67Ga-citrate accumulation were studied in rabbits with subcutaneous polyethylene chambers. Uninfected chamber fluid (CF) contained less than 1,000 WBCs/mm3, most of which were mononuclear. After 67Ga injection, radioactivity increased slowly in uninfected fluid, peaked betwee...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.140.1.6787660
更新日期:1981-07-01 00:00:00
abstract::Magnetic resonance (MR) imaging was performed in 58 children aged 1 day to 17 years. In 43 patients with suspected renal abnormalities, the results of MR were compared with those obtained by ultrasonography, computed tomography, or excretory urography. The remaining 15 children with no known renal disease were initial...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.159.1.3952310
更新日期:1986-04-01 00:00:00
abstract:PURPOSE:To evaluate fluid-attenuated inversion-recovery (FLAIR) magnetic resonance (MR) imaging in a blinded reader study for the detection of proved subarachnoid space (SAS) disease. MATERIALS AND METHODS:FLAIR MR imaging was performed in 62 patients (21 with proved SAS or meningeal disease) and 41 control patients. ...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.208.2.9680570
更新日期:1998-08-01 00:00:00
abstract:PURPOSE:To describe imaging features of tuberculous tenosynovitis and bursitis with various imaging methods. MATERIALS AND METHODS:Twenty-one patients with surgically and/or pathologically proved tuberculosis of the tendon sheaths or bursae were evaluated. Routine radiography, arthrography, computed tomography (CT), a...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.201.2.8888250
更新日期:1996-11-01 00:00:00
abstract:PURPOSE:To determine the speed of and changes in the speed of coronary arterial movement during the cardiac cycle with electron-beam computed tomography (CT). MATERIALS AND METHODS:With electron-beam CT, 20 consecutive cross-sectional images were acquired at the mid right coronary artery (with 50-msec acquisition time...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.216.2.r00au19457
更新日期:2000-08-01 00:00:00
abstract::Sensitivity and specificity of first screen mammography in a randomized screening trial at five centers are reported. A total of 23,101 women underwent mammography; in 139, breast cancer was detected at first screening; in 20, less than 12 months after first screening; and in 47, at second screening. All 206 cancer ca...
journal_title:Radiology
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1148/radiology.160.2.3523590
更新日期:1986-08-01 00:00:00
abstract::Microglioma (reticulum-cell sarcoma) of the central nervous system is uncommon. The authors reviewed 12 biopsy-proved cases with clinical and radiographic evidence of involvement limited to the central nervous system which were seen between 1966 and 1980. The age range was 15-81 and there were 8 females and 4 males. N...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.149.2.6353480
更新日期:1983-11-01 00:00:00
abstract::Gadolinium chelates, intended as intravenous contrast media for magnetic resonance imaging, have been regarded as nonnephrotoxic and recommended to replace iodinated contrast media in patients with azotemia who are undergoing digital subtraction angiography (DSA). High intraarterial doses (up to 220 mmol of gadodiamid...
journal_title:Radiology
pub_type: 杂志文章,评审
doi:10.1148/radiol.2232010221
更新日期:2002-05-01 00:00:00
abstract::Angiographic ablation of parathyroid adenomas with ionic contrast material was performed in 24 patients with persistent hyperparathyroidism who had undergone at least one prior unsuccessful surgical resection; 23 had mediastinal adenomas. The success rate was 83% at 1 month after ablation and 71% at both 5 and 9 years...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.165.3.3685340
更新日期:1987-12-01 00:00:00
abstract:PURPOSE:To evaluate differences in T2 values in femoral and tibial cartilage at magnetic resonance (MR) imaging in patients with varying degrees of osteoarthritis (OA) compared with healthy subjects and to develop a mapping and display method based on calculation of T2 z scores for visual grading and assessment of cart...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiol.2322030976
更新日期:2004-08-01 00:00:00
abstract:PURPOSE:To evaluate the potential of quantitative susceptibility (QS) and R2* mapping as surrogate biomarkers of clinically relevant, age-adjusted demyelination and iron deposition in multiple sclerosis (MS). MATERIALS AND METHODS:All study participants gave written informed consent, and the study was approved by the ...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiol.14132475
更新日期:2014-09-01 00:00:00
abstract::The chest radiographs of asthmatic patients in an emergency room setting over a four-year period were reviewed. A total of 997 radiographs was reviewed; radiographic findings were compared with history and clinical data. In adults 2.2% of the radiographs were abnormal; in children 13%. It is concluded that a chest rad...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.145.1.7122890
更新日期:1982-10-01 00:00:00
abstract::Institutional review board approval, with waived consent, was obtained to develop a spine-labeling algorithm with retrospectively obtained deidentified HIPAA-compliant data. An automated magnetic resonance (MR) imaging technique to rapidly survey the entire spine and provide definitive numbering of disks and vertebrae...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiol.2383050456
更新日期:2006-04-01 00:00:00
abstract::Anti-scatter grids reduce the amount of secondary radiation contributing to the image and improve the signal-to-noise ratio. However, they may also lead to the creation of linear artifacts representing the shadows of the radiopaque septa. Grid motion perpendicular to the septa during the exposure can cause blurring of...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.147.1.6828740
更新日期:1983-04-01 00:00:00
abstract::Ultrasonography and endoscopic retrograde cholangiopancreatography (ERCP) were performed in 216 patients with known or suspected pancreatic disease. Both techniques provided accurate information in all groups of patients (normals and those with recurrent acute pancreatitis, chronic pancreatitis, and cancer), and there...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.134.2.7352230
更新日期:1980-02-01 00:00:00
abstract::Monooctanoin, a cholesterol solvent, was infused into the biliary system of 11 patients. Twenty-eight (74%) of 38 total stones responded to monooctanoin: 16 (42%) decreased in size, and 12 (32%) dissolved completely. Ten stones (26%) did not change in size. We attribute this to inadequate drug-stone contact, which was...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.153.2.6484170
更新日期:1984-11-01 00:00:00
abstract:PURPOSE:To clarify the angiographic findings of the posterior circulation in patients with moyamoya disease. MATERIALS AND METHODS:Seventy-six patients with idiopathic moyamoya disease were studied with conventional angiography. The angiographic findings were reviewed for steno-occlusive lesions, collateral vessels, a...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.197.1.7568830
更新日期:1995-10-01 00:00:00
abstract::A case of methotrexate-induced brain damage is presented. Computed tomography (CT) demonstrated a high-density mass lesion with a low-density area in the white matter which pathologically represented a large area of acute necrotizing cerebritis. CT appearance was indistinguishable from brain abscess. ...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/122.2.377
更新日期:1977-02-01 00:00:00
abstract:PURPOSE:To determine objectively the current standard of reporting for studies of computer-aided detection (CAD) for computed tomographic (CT) colonography by systematically reviewing published articles. MATERIALS AND METHODS:MEDLINE was searched to identify study articles meeting the inclusion criteria for describing...
journal_title:Radiology
pub_type: 杂志文章,meta分析,评审
doi:10.1148/radiol.2461070121
更新日期:2008-02-01 00:00:00
abstract::Methyl glucamine sodium diatrizoate (Renografin 76) was directly infused into the isolated arteries to the sino-atrial and atrioventricular nodes of anesthetized dogs, causing a dose-related inhibition of sino-atrial nodal automaticity and atrioventricular nodal conductivity; these effects were not attenuated by auton...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/121.1.205
更新日期:1976-10-01 00:00:00
abstract::BackgroundMethylphenidate (MPH) is highly effective in treating attention-deficit/hyperactivity disorder (ADHD). However, not much is known about its effect on the development of human brain white matter (WM).PurposeTo determine whether MPH modulates WM microstructure in an age-dependent fashion in a randomized double...
journal_title:Radiology
pub_type: 杂志文章,随机对照试验
doi:10.1148/radiol.2019182528
更新日期:2019-10-01 00:00:00
abstract:PURPOSE:To determine whether the computed tomographic (CT) appearances of multiple pulmonary nodules in patients with acquired immunodeficiency syndrome (AIDS) can help differentiate the potential infectious and neoplastic causes. MATERIALS AND METHODS:The thoracic CT scans obtained in 60 patients with AIDS and multip...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.214.2.r00fe22427
更新日期:2000-02-01 00:00:00
abstract:PURPOSE:To retrospectively evaluate the long-term results of radiofrequency (RF) ablation combined with chemoembolization (combination therapy) as compared with hepatectomy for the treatment of early-stage hepatocellular carcinoma (HCC). MATERIALS AND METHODS:The study was approved by the institutional review board, a...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiol.2471070818
更新日期:2008-04-01 00:00:00
abstract::Metallic foreign bodies ingested by eight patients (seven children) were removed from the upper gastrointestinal tract by means of a magnet inserted into the end of an orogastric tube. No patient required hospitalization, anesthesia, surgery, or subsequent radiography, and all patients remained asymptomatic. In no cas...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.160.2.3726120
更新日期:1986-08-01 00:00:00
abstract::When fast, nondynamic scanning techniques are used in combination with adequate intravenous injection of contrast material, good-quality images of the pulmonary artery (PA) can be obtained with routine computed tomography (CT). The purpose of this study was to evaluate PA filling defects detected on these CT scans. Tw...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.188.3.8351360
更新日期:1993-09-01 00:00:00
abstract:PURPOSE:To determine the relationship between annual screening volume and radiologist performance in the Screening Mammography Program of British Columbia, Canada. MATERIALS AND METHODS:Standardized abnormal interpretation ratios and standardized cancer detection ratios were constructed for 35 readers with at least 3 ...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.215.2.r00ma42563
更新日期:2000-05-01 00:00:00
abstract::Kimray-Greenfield filters were inserted percutaneously into the inferior vena cava (IVC) in 57 patients. Thirty-six were placed from the right femoral vein, 14 from the left femoral vein, and seven from the right internal jugular vein. There were no deaths or major complications and only six minor complications. Infer...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.165.2.3659360
更新日期:1987-11-01 00:00:00
abstract::Background Trends in noninvasive diagnostic imaging (NDI) utilization rates have predominantly been reported in Medicare enrollees. To the authors' knowledge, there has been no prior direct comparison of utilization rates between Medicare and commercially insured patients. Purpose To analyze trends in NDI utilization ...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiol.2019191116
更新日期:2020-02-01 00:00:00
abstract:PURPOSE:To determine if the intradecidual sign at sonography is effective in the diagnosis of early intrauterine pregnancy. MATERIALS AND METHODS:In 102 pregnant patients, transvaginal sonography revealed an intrauterine fluid collection without a yolk sac or embryo. Four observers (experienced sonologist, body imagin...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.204.3.9280240
更新日期:1997-09-01 00:00:00
abstract:PURPOSE:To evaluate the repeatability of quantitative computed tomographic (CT) indexes of emphysema and the effect of spirometric gating of lung volume during CT in candidates for lung volume reduction surgery (LVRS). MATERIALS AND METHODS:Initial and same-day repeat routine inspiratory spiral chest CT studies were p...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.220.2.r01au46448
更新日期:2001-08-01 00:00:00