Radiology (RADIOLOGY)

Publisher: Radiological Society of North America; Radiological Society of North America. Scientific Assembly, Radiological Society of North America

Journal description

Published regularly since 1923, Radiology has long been recognized as the authoritative reference for the most current, clinically relevant, and highest quality research in the field of radiology. Each month the journal publishes 296 pages of peer-reviewed original research, authoritative reviews, well-balanced commentary on significant articles, and expert opinion on new techniques and technologies.

Current impact factor: 6.87

Impact Factor Rankings

2015 Impact Factor Available summer 2016
2014 Impact Factor 6.867
2013 Impact Factor 6.214
2012 Impact Factor 6.339
2011 Impact Factor 5.726
2010 Impact Factor 6.066
2009 Impact Factor 6.341
2008 Impact Factor 5.996
2007 Impact Factor 5.561
2006 Impact Factor 5.251
2005 Impact Factor 5.377
2004 Impact Factor 5.076
2003 Impact Factor 4.815
2002 Impact Factor 4.844
2001 Impact Factor 4.759
2000 Impact Factor 4.13
1999 Impact Factor 4.621
1998 Impact Factor 4.753
1997 Impact Factor 4.989
1996 Impact Factor 4.698
1995 Impact Factor 3.899
1994 Impact Factor 3.8
1993 Impact Factor 3.317
1992 Impact Factor 3.307

Impact factor over time

Impact factor

Additional details

5-year impact 7.26
Cited half-life >10.0
Immediacy index 0.94
Eigenfactor 0.08
Article influence 2.55
Website Radiology website
Other titles Radiology, RSNA index to imaging literature., RSNA-SCVIR special series
ISSN 0033-8419
OCLC 1763380
Material type Periodical, Internet resource
Document type Journal / Magazine / Newspaper, Internet Resource

Publisher details

Radiological Society of North America

  • Pre-print
    • Author cannot archive a pre-print version
  • Post-print
    • Author cannot archive a post-print version
  • Conditions
    • On PubMed Central only
    • Publisher will deposit final published version of NIH author's article in PubMed Central
    • Publisher's version/PDF must be used
    • Publisher last contacted on 19/08/2015
  • Classification
    ​ white

Publications in this journal

  • [Show abstract] [Hide abstract]
    ABSTRACT: Purpose To determine associations of metabolite levels derived from magnetic resonance (MR) spectroscopic imaging (ie, hydrogen 1 [(1)H] MR spectroscopic imaging) and apparent diffusion coefficients (ADCs) from diffusion-weighted imaging with prostate tissue composition assessed by digital image analysis of histologic sections. Materials and Methods Institutional ethical review board approved this retrospective study and waived informed consent. Fifty-seven prostate cancer patients underwent an MR examination followed by prostatectomy. One hematoxylin and eosin-stained section of the resected prostate per patient was digitized and computationally segmented into nuclei, lumen, and combination of epithelial cytoplasm and stroma. On each stained section, regions of interest (ROIs) were chosen and matched to the corresponding ADC map and (1)H MR spectroscopic imaging voxels. ADC and two metabolite ratios (citrate [Cit], spermine [Spm], and creatine [Cr] to choline [Cho] and Cho to Cr plus Spm) were correlated with percentage areas of nuclei, lumen, and cytoplasm and stroma for peripheral zone (PZ), transition zone (TZ), and tumor tissue in both zones of the prostate by using a linear mixed-effect model and Spearman correlation coefficient (ρ). Results ADC and (Cit + Spm + Cr)/Cho ratio showed positive correlation with percentage area of lumen (ρ = 0.43 and 0.50, respectively) and negative correlation with percentage area of nuclei (ρ = -0.29 and -0.26, respectively). The Cho/(Cr + Spm) ratio showed negative association with percentage area of lumen (ρ = -0.40) and positive association with area of nuclei (ρ = 0.26). Percentage areas of lumen and nuclei, (Cit + Spm + Cr)/Cho ratio, and ADC were significantly different (P < .001) between benign PZ (23.7 and 7.7, 8.83, and 1.58 × 10(-3) mm(2)/sec, respectively) and tumor PZ tissue (11.4 and 12.5, 5.13, and 1.20 × 10(-3) mm(2)/sec, respectively). These parameters were also significantly different between benign TZ (20.0 and 8.2, 6.50, and 1.26 × 10(-3) mm(2)/sec, respectively) and tumor TZ tissue (9.8 and 11.2, 4.36, and 1.03 × 10(-3) mm(2)/sec, respectively). Conclusion The observed correlation of (Cit + Spm + Cr)/Cho ratio and ADC of the prostate with its tissue composition indicates that components of this composition, such as percentage luminal area, contribute to the value of these MR parameters. (©) RSNA, 2015.
    Radiology 09/2015; DOI:10.1148/radiol.2015142889
  • Article: Case 223
    Radiology 07/2015; 276(1):302-303. DOI:10.1148/radiol.2015140144
  • Radiology 06/2015;
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    ABSTRACT: Purpose To investigate the technical feasibility of hybrid simultaneous fluoroscopic and nuclear imaging. Materials and Methods An x-ray tube, an x-ray detector, and a gamma camera were positioned in one line, enabling imaging of the same field of view. Since a straightforward combination of these elements would block the lines of view, a gamma camera setup was developed to be able to view around the x-ray tube. A prototype was built by using a mobile C-arm and a gamma camera with a four-pinhole collimator. By using the prototype, test images were acquired and sensitivity, resolution, and coregistration error were analyzed. Results Nuclear images (two frames per second) were acquired simultaneously with fluoroscopic images. Depending on the distance from point source to detector, the system resolution was 1.5-1.9-cm full width at half maximum, the sensitivity was (0.6-1.5) × 10(-5) counts per decay, and the coregistration error was -0.13 to 0.15 cm. With good spatial and temporal alignment of both modalities throughout the field of view, fluoroscopic images can be shown in grayscale and corresponding nuclear images in color overlay. Conclusion Measurements obtained with the hybrid imaging prototype device that combines simultaneous fluoroscopic and nuclear imaging of the same field of view have demonstrated the feasibility of real-time simultaneous hybrid imaging in the intervention room. (©) RSNA, 2015 Online supplemental material is available for this article.
    Radiology 06/2015; DOI:10.1148/radiol.2015142749
  • Article: Case 222
    Radiology 06/2015; 275(3):920-922. DOI:10.1148/radiol.2015131417
  • Article: Case 221
    Radiology 05/2015; 275(2):609-612. DOI:10.1148/radiol.2015132797
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    ABSTRACT: Purpose: To investigate the hypothesis that the clinically observed decrease in apparent diffusion coefficient (ADC) at diffusion weighted magnetic resonance imaging with increasing prostate cancer Gleason grade can be attributed to an increasing volume of low-diffusivity epithelial cells and corresponding decreasing volumes of higher-diffusivity stroma and lumen space rather than to increased cell density. Materials and Methods: Tissue samples were acquired after Institutional Ethics Review Committee approval and informed consent from patients were obtained. Nuclear count, nuclear area, and gland component volumes (epithelium, stroma, lumen space) were measured in tissue from 14 patients. Gland component volumes and cellularity metrics were correlated with Gleason pattern (Spearman rank correlation coeffi cient) and measured ADC (Pearson correlation coefficient) in six prostates ex vivo. Differences between metrics for cancerous tissue and those for normal tissue were assessed by using a two-tailed two-sample t test. Linear mixed models with a post-hoc Fisher least significant difference test were used to assess differences between gland component volumes and cellularity metrics for multiple groups. To adjust for a clustering effect due to repeated measures, the organ mean value of the measured metric for each tissue type was used in the analysis. Results: There were significant differences between Gleason patterns for gland component volumes (P < .05) but not nuclear count (P = .100) or area (P = .141). There was a stronger correlation of Gleason pattern with gland component volumes (n = 553) of epithelium (Spearman r = 0.898, P < .001), stroma (r = -0.651, P < .001), and lumen space (r = -0.912, P = .007) than with the cellularity metrics (n = 288) nuclear area (r = 0.422, P = .133) or nuclear count (r = 0.082, P = .780). There was a stronger correlation between measured ADC and lumen volume (r = 0.688, P , .001) and epithelium volume (r = -0.647, P < .001) than between ADC and nuclear count (r = -0.598, P < .001) or nuclear area (r = -0.569, P < .001) (n = 57). Conclusion: Differences in the gland compartment volumes of prostate tissue having distinct diffusivities, rather than changes in the conventionally cited “cellularity” metrics, are likely to be the major contributor to clinically observed variations of ADC in prostate tissue.
    Radiology 04/2015; DOI:10.1148/radiol.2015142414
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    ABSTRACT: Purpose To retrospectively investigate whether parenchymal enhancement in dynamic contrast material–enhanced magnetic resonance (MR) imaging of the contralateral breast in patients with unilateral invasive breast cancer is associated with therapy outcome. Materials and Methods After obtaining approval of the institutional review board and patients’ written informed consent, 531 women with unilateral invasive breast cancer underwent dynamic contrast-enhanced MR imaging between 2000 and 2008. The contralateral parenchyma was segmented automatically, in which the mean of the top 10% late enhancement was calculated. Cox regression was used to test associations between parenchymal enhancement, patient and tumor characteristics, and overall survival and invasive disease–free survival. Subset analyses were performed and stratified according to immunohistochemical subtypes and type of adjuvant treatment received. Results Median follow-up was 86 months. Age (P < .001) and immunohistochemical subtype (P = .042) retained significance in multivariate analysis for overall survival. In patients with estrogen receptor–positive and human epidermal growth factor receptor 2 (HER2)–negative breast cancer (n = 398), age (P < .001), largest diameter on MR images (P = .049), and parenchymal enhancement (P = .011) were significant. In patients who underwent endocrine therapy (n = 174), parenchymal enhancement was the only significant covariate for overall survival and invasive disease–free survival (P < .001). Conclusion Results suggest that parenchymal enhancement in the contralateral breast of patients with invasive unilateral breast cancer is significantly associated with long-term outcome, particularly in patients with estrogen receptor–positive, human epidermal growth factor receptor 2–negative breast cancer. Lower value of the mean top 10% enhancement of the parenchyma shows potential as a predictive biomarker for relatively poor outcome in patients who undergo endocrine therapy. These results should, however, be validated in a larger study.
    Radiology 03/2015; 276(3):-. DOI:10.1148/radiol.15142192
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    ABSTRACT: Purpose To assess lung magnetic resonance (MR) imaging with a respiratory-gated pointwise encoding time reduction with radial acquisition (PETRA) sequence at 1.5 T and compare it with imaging with a standard volumetric interpolated breath-hold examination (VIBE) sequence, with extra focus on the visibility of bronchi and the signal intensity of lung parenchyma. Materials and Methods The study was approved by the local ethics committee, and all subjects gave written informed consent. Twelve healthy volunteers were imaged with PETRA and VIBE sequences. Image quality was evaluated by using visual scoring, numbering of visible bronchi, and quantitative measurement of the apparent contrast-to-noise ratio (CNR) and signal-to-noise ratio (SNR). For preliminary clinical assessment, three young patients with cystic fibrosis underwent both MR imaging and computed tomography (CT). Comparisons were made by using the Wilcoxon signed-rank test for means and the McNemar test for ratios. Agreement between CT and MR imaging disease scores was assessed by using the κ test. Results PETRA imaging was performed with a voxel size of 0.86 mm3. Overall image quality was good, with little motion artifact. Bronchi were visible consistently up to the fourth generation and in some cases up to the sixth generation. Mean CNR and SNR with PETRA were 32.4% ± 7.6 (standard deviation) and 322.2% ± 37.9, respectively, higher than those with VIBE (P < .001). Good agreement was found between CT and PETRA cystic fibrosis scores (κ = 1.0). Conclusion PETRA enables silent, free-breathing, isotropic, and submillimeter imaging of the bronchi and lung parenchyma with high CNR and SNR and may be an alternative to CT for patients with cystic fibrosis. © RSNA, 2015 Online supplemental material is available for this article.
    Radiology 03/2015;
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    ABSTRACT: Purpose: To use magnetic resonance (MR) imaging to document the appearance of perianal infection in patients with a hematologic malignancy (HM) compared with that in immunocompetent control patients. Materials and methods: After an ethical waiver was obtained, 38 patients with an HM were matched by age and sex to 38 control patients with no history of immunocompromise or Crohn disease. Both groups had undergone MR imaging for perianal symptoms and/or systemic sepsis. Two radiologists who were blinded to the diagnosis independently reviewed the MR images and recorded the size and distribution of abscesses and/or fistula tracts, the extent of perianal edema, and the likely diagnosis. Groups were compared by using the Mann-Whitney-Wilcoxon, χ(2), or Fisher exact test. Receiver operating characteristic (ROC) curves were constructed to estimate the ability of MR imaging to help distinguish patients with an HM from control patients. Results: Patients with an HM had significantly greater perianal edema than did control patients (mean arc angle of anal canal involved, 220° vs 60°; P < .001). However, they had significantly lower rates of fistula (15 [39.5%] vs 35 [92.1%] of 38; P < .001). Abscesses were similar in frequency (10 [26.3%] vs 17 [44.7%] of 38; P = .15) and were unrelated to the degree of neutropenia (P = .71) or the use of chemotherapy (P = .10). Surgical treatment was rarely required in patients with an HM, either during the acute illness (four [10.5%] of 38) or thereafter (three [7.9%] of 38). MR imaging had an excellent ability to help discriminate patients with HM from immunocompetent patients (areas under the ROC curve, 0.91 and 0.97). Conclusion: Perianal infection in patients with an HM is more likely to cause diffuse perianal edema and is less likely to cause fistulas than in immunocompetent patients. MR imaging can help distinguish patients with an HM from those without immunocompromise.
    Radiology 03/2015; 276(1). DOI:10.1148/radiol.15141662
  • Radiology 02/2015;
  • Radiology 02/2015;
  • Radiology 01/2015; 274(1):307-307. DOI:10.1148/radiol.14144043
  • Radiology 01/2015; 274(1):7-8. DOI:10.1148/radiol.14142273