Abstract:
PURPOSE:To determine the variability of apparent diffusion coefficient (ADC) values in various anatomic regions in the upper abdomen measured with magnetic resonance (MR) systems from different vendors and with different field strengths. MATERIALS AND METHODS:Ten healthy men (mean age, 36.6 years ± 7.7 [standard deviation]) gave written informed consent to participate in this prospective ethics committee-approved study. Diffusion-weighted (DW) MR imaging was performed in each subject with 1.5- and 3.0-T MR systems from each of three vendors at two institutions. Two readers independently measured ADC values in seven upper abdominal regions (left and right liver lobe, gallbladder, pancreas, spleen, and renal cortex and medulla). ADC values were tested for interobserver differences, as well as for differences related to field strength and vendor, with repeated-measures analysis of variance; coefficients of variation (CVs) and variance components were calculated. RESULTS:Interreader agreement was excellent (intraclass coefficient, 0.876). ADC values were (77.5-88.8) ×10(-5) mm(2)/sec in the spleen and (250.6-278.5) ×10(-5) mm(2)/sec in the gallbladder. There were no significant differences between ADC values measured at 1.5 T and those measured at 3.0 T in any anatomic region (P >.10 for all). In two of seven regions at 1.5 T (left and right liver lobes, P < .023) and in four of seven regions at 3.0 T (left liver lobe, pancreas, and renal cortex and medulla, P < .008), intervendor differences were significant. CVs ranged from 7.0% to 27.1% depending on the anatomic location. CONCLUSION:Despite significant intervendor differences in ADC values of various anatomic regions of the upper abdomen, ADC values of the gallbladder, pancreas, spleen, and kidney may be comparable between MR systems from different vendors and between different field strengths.
journal_name
Radiologyjournal_title
Radiologyauthors
Donati OF,Chong D,Nanz D,Boss A,Froehlich JM,Andres E,Seifert B,Thoeny HCdoi
10.1148/radiol.13130819subject
Has Abstractpub_date
2014-02-01 00:00:00pages
454-63issue
2eissn
0033-8419issn
1527-1315journal_volume
270pub_type
杂志文章,多中心研究相关文献
RADIOLOGY文献大全abstract::Magnetic resonance (MR) imaging of the kidneys was performed in 14 patients with a severe form of hemorrhagic fever with renal syndrome (HFRS), a major public health problem in Far Eastern Asia. To the authors' knowledge, this is the first report of renal assessment with MR imaging in HFRS. Three MR imaging studies we...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.175.3.1971450
更新日期:1990-06-01 00:00:00
abstract:PURPOSE:To assess methods of standard uptake ratio (SUR) calculation with 2-deoxy-2-[fluorine-18]fluoro-D-glucose (FDG) positron emission tomography (PET) in indeterminate focal pulmonary abnormalities. MATERIALS AND METHODS:One hundred ninety-seven adult patients with indeterminate pulmonary abnormalities had complet...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.202.2.9015070
更新日期:1997-02-01 00:00:00
abstract:PURPOSE:To determine the radiation dose to radiologists who perform computed tomographic (CT) fluoroscopic interventional procedures by using a quick-check method and a low-milliampere technique. MATERIALS AND METHODS:Two hundred twenty CT fluoroscopy--guided interventional procedures were performed in 189 patients. P...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.220.1.r01jl29161
更新日期:2001-07-01 00:00:00
abstract::Forty-seven females with duplication of the uterus and cervix were retrospectively studied to obtain a better understanding of the reasons for failure of fusion of the müllerian ducts by analyzing the associated genitourinary malformations. Thirty-one of the 47 patients had major genitourinary malformations that corre...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.144.4.6213980
更新日期:1982-09-01 00:00:00
abstract::Pressure, or compressive, erosions of bone in various locations in patients with rheumatoid arthritis are described. Possible pathophysiologic mechanisms that account for the appearance and distribution of these erosions include osteopenia, soft-tissue laxity, soft-tissue pressure on bone, bone pressure on bone, and m...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.155.1.3975420
更新日期:1985-04-01 00:00:00
abstract::The rates of diabetes, obesity, and metabolic disease have reached epidemic proportions worldwide. In recent years there has been renewed interest in combating these diseases not only by modifying energy intake and lifestyle factors, but also by inducing endogenous energy expenditure. This approach has largely been st...
journal_title:Radiology
pub_type: 杂志文章,评审
doi:10.1148/radiol.2016150390
更新日期:2016-07-01 00:00:00
abstract::Renal uptake of 99mTc-sulfur colloid during liver and spleen imaging was observed in 4 patients; all had moderate to severe congestive heart failure. Four similar patients with this association have been reported. Although the exact mechanism of colloid uptake by the kidneys is not known, an association with congestiv...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/127.1.185
更新日期:1978-04-01 00:00:00
abstract::Purpose To evaluate the impact of accountable care organizations (ACOs) on use of screening mammography in the Medicare Shared Savings Program (MSSP), the largest value-based reimbursement program in U.S. HISTORY:Materials and Methods Institutional review board approval was waived, as the study used publicly availabl...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiol.2016160554
更新日期:2017-02-01 00:00:00
abstract::The Wiener spectra of five screen-film systems were studied as a function of monoenergetic x-ray energy. These spectra, in their low-frequency limits, were seen to depend linearly on x-ray energy. The Wiener spectra also decreased in magnitude as the incident x-ray energy exceeded that of the screen phosphor K absorpt...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.144.3.7100480
更新日期:1982-08-01 00:00:00
abstract::Twenty-seven patients presented with painful acute scrotal swelling. After a clinical impression was established, all patients underwent diagnostic imaging with color Doppler ultrasound (US). Seven patients underwent surgical exploration for testicular torsion diagnosed with color Doppler US (100% operative confirmati...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.176.2.2195590
更新日期:1990-08-01 00:00:00
abstract::Gated radionuclide imaging with 99mTc-labeled red blood cells was employed to assess changes in right atrial (RA) volume in 17 subjects. Studies were repeated within two hours in five of 12 normal subjects and at two and ten days after infarction in five patients. Time-activity curves were generated for the RA and rig...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.139.3.7232740
更新日期:1981-06-01 00:00:00
abstract:PURPOSE:To evaluate oxygen-enhanced T1-mapping magnetic resonance (MR) imaging as a noninvasive method for visualization and quantification of regional inflammation after segmental allergen challenge in asthmatic patients compared with control subjects. MATERIALS AND METHODS:After institutional review board approval, ...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiol.14132607
更新日期:2015-01-01 00:00:00
abstract::Irradiation of the orbit is often associated with substantial dose inhomogeneity resulting from the insertion of lens blocks. We postulated that such dose inhomogeneity, which often exceeds 40%, could be halved by the use of two pairs of wedged beams, one angled in the sagittal plane and the other in the commonly empl...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.156.3.4023250
更新日期:1985-09-01 00:00:00
abstract:PURPOSE:To comply with federal and state guidelines, a credentialing process was developed for nonradiologist medical users of fluoroscopy. MATERIALS AND METHODS:Seventy-three nonradiologist physicians participated in a program consisting of (a) an introductory 1-hour lecture; (b) a 10-page booklet providing basic inf...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.190.1.8259420
更新日期:1994-01-01 00:00:00
abstract::Using a method combining the velocity of ultrasound and photon absorptiometry in the human radius in vivo, the authors measured the speed of sound in bone (U) and bone mineral content (BMC). From these measurements and a "simple" bone model, they then computed the bone mineral density, compact bone density, and modulu...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.138.3.7465850
更新日期:1981-03-01 00:00:00
abstract::An anastomosis between the left renal and left ascending lumbar veins may appear as a mass on CT scans due to a varicosity where the veins separate. Intravenous injection of contrast material reveals the vascular nature of the mass. ...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.152.2.6739820
更新日期:1984-08-01 00:00:00
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-paramagn...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.172.2.2748820
更新日期:1989-08-01 00:00:00
abstract::Five cases of prolapsing ectopic ureterocele are described. All five patients were boys and all had duplex kidneys; in four cases this duplication was bilateral. There was significant obstructive uropathy in all of the cases. It is easy to overlook the diagnosis of prolapsing ectopic ureterocele or to misdiagnose the ...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.140.2.7255710
更新日期:1981-08-01 00:00:00
abstract::Failures and complications were analyzed retrospectively in 45 patients treated with embolotherapy or occlusion of pulmonary arterial circulation. Pulmonary arterial branches were occluded with steel coils in 19 patients with pulmonary arteriovenous malformations, 17 with hemoptysis of pulmonary artery (PA) origin, an...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.180.3.1871280
更新日期:1991-09-01 00:00:00
abstract:PURPOSE:To show that benign asymmetric breast tissue detected mammographically may increase over time. MATERIALS AND METHODS:Serial mammograms obtained in 21 women with negative physical examination results and mammographically detected developing asymmetric breast tissue were reviewed, and findings were correlated wi...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.211.1.r99ap42111
更新日期:1999-04-01 00:00:00
abstract:PURPOSE:To retrospectively assess endoleak shapes and locations within aneurysms to differentiate type II from type I and type III endoleaks. MATERIALS AND METHODS:The institutional review board granted an exemption for this HIPAA-compliant study; patient informed consent was not required. A retrospective review of ar...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiol.2403051013
更新日期:2006-09-01 00:00:00
abstract:PURPOSE:To prospectively determine whether dynamic contrast material-enhanced (DCE) magnetic resonance (MR) quantitative parameters correlate with fibrosis and microvascular density (MVD) in malignant and benign solid pancreatic focal lesions and nontumoral pancreatic tissue. MATERIALS AND METHODS:The institutional re...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiol.11103515
更新日期:2011-11-01 00:00:00
abstract:PURPOSE:To determine whether vascular, ischemic, and inflammatory causes of bowel wall thickening in children can be differentiated at gray-scale and color Doppler ultrasonography (US). MATERIALS AND METHODS:Thirty-seven children with acute bowel disease underwent graded compression US. Findings of bowel wall thicknes...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.203.3.9169680
更新日期:1997-06-01 00:00:00
abstract::The vlue of epinephrine enhanced angiography in the preoperative distinction of isolated hamartoma (angiomyolipoma without stigma of tuberous sclerosis) from hypernephroma has been largely discounted in the past. The authors performed this procedure in 6 patients (4 with isolated hamartoma and 2 with tuberous sclerosi...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/132.1.61
更新日期:1979-07-01 00:00:00
abstract::Sonographic analysis of the sciatic nerve was performed in vitro (anatomic specimen), in vivo (healthy volunteers), and in 16 patients with suspected peripheral sciatic nerve lesions. The ultrasound (US) examinations were performed with standard and high-resolution US equipment with linear-array configuration. The nor...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.181.2.1924780
更新日期:1991-11-01 00:00:00
abstract::Fifty-seven patients with hemorrhagic intracranial lesions were examined with magnetic resonance (MR) imaging at 1.5 T with use of both spin-echo (SE) and gradient-echo-acquisition (GEA) techniques to assess the clinical applications and limitations of GEA in evaluation of intracranial hemorrhage at high field strengt...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.168.3.3406410
更新日期:1988-09-01 00:00:00
abstract:PURPOSE:To develop criteria to identify thresholds for minimally acceptable physician performance in interpreting screening mammography studies and to profile the impact that implementing these criteria may have on the practice of radiology in the United States. MATERIALS AND METHODS:In an institutional review board-a...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiol.10091636
更新日期:2010-05-01 00:00:00
abstract::A prospective study of 582 pediatric cranial computed tomographic (CT) examinations was made in order to determine the efficacy and safety of two sedation regimens and general anesthesia. Two hundred seventy-nine outpatients were randomly given oral chloral hydrate (80 mg/kg) or an intramuscular preparation composed o...
journal_title:Radiology
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1148/radiology.143.2.7071350
更新日期:1982-05-01 00:00:00
abstract:PURPOSE:To compare the value of enhancement and pharmacokinetic parameters measured at dynamic gadoxetate-enhanced magnetic resonance (MR) imaging in determining hepatic organic anion transporter expression in control rats and rats with advanced liver fibrosis. MATERIALS AND METHODS:Institutional animal review board a...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiol.14140313
更新日期:2015-02-01 00:00:00
abstract::The importance of axillary node status in the prognosis of breast cancer led the authors to conduct a prospective study comparing the value of clinical examination with ultrasound (US) performed by a transpectoral approach. All 60 patients examined underwent axillary dissection. Sensitivity was 45.4% for clinical exam...
journal_title:Radiology
pub_type: 杂志文章
doi:10.1148/radiology.158.2.3510440
更新日期:1986-02-01 00:00:00