Image artifacts on prostate diffusion-weighted magnetic resonance imaging: Trade-offs at 1.5 Tesla and 3.0 Tesla Journal Article

   


Authors: Mazaheri, Y.; Vargas, H. A.; Nyman, G.; Akin, O.; Hricak, H.
Article Title: Image artifacts on prostate diffusion-weighted magnetic resonance imaging: Trade-offs at 1.5 Tesla and 3.0 Tesla
Abstract: Rationale and Objectives: To identify the presence and extent of artifacts in prostate diffusion-weighted magnetic resonance imaging (DW-MRI) and discuss tradeoffs between imaging at 1.5T (1.5T) and 3.0T (3.0T). In addition, we aim to provide quantitative estimates of signal-to-noise ratios (SNRs) at both field strengths. Materials and Methods: The institutional review board waived informed consent for this Health Insurance Portability and Accountability Act-compliant, retrospective study of 53 consecutive men who underwent 3.0T endorectal DW-MRI and 53 consecutive men who underwent 1.5T endorectal DW-MRI between October and December 2010. One radiologist and one physicist, blinded to patient characteristics, image acquisition parameters, and field strength, scored DW-MRI artifacts. On b = 0 images, SNR was measured as the ratio of the mean signal from a region of interest (ROI) at the level of the verumontanum (the "reference region") to the standard deviation from the mean signal in an artifact-free ROI in the rectum. Results: Both readers found geometric distortion and signal graininess significantly more often at 3.0T than at 1.5T (P < .0001, all comparisons). Reader 2 (but not reader 1) found ghosting artifacts more often at 3.0T (P = .001) and blurring more often at 1.5T (P=006). Mean SNR at the urethra (87.92 ± 27.76) at 3.0T was 1.43 times higher than at 1.5T (64.51 ± 14.96) (P < .0001). Conclusions: At 3.0T (as compared to 1.5T), increased SNR on prostate DW-MRI comes at the expense of geometric distortion and canalso lead to more pronounced ghosting artifacts. Therefore, to take full advantage of the benefits of 3.0T, further improvements in acquisition techniques are needed to address DW-MRI artifacts corresponding to higher field strengths. © 2013.
Keywords: adult; controlled study; aged; aged, 80 and over; middle aged; major clinical study; sensitivity and specificity; reproducibility of results; image interpretation, computer-assisted; signal noise ratio; retrospective study; algorithms; prostate cancer; prostatic neoplasms; prostate; image enhancement; geometry; artifact; diffusion weighted imaging; diffusion magnetic resonance imaging; artifacts; strength; mri; nuclear magnetic resonance scanner; diffusion-weighted imaging; magnetic field
Journal Title: Academic Radiology
Volume: 20
Issue: 8
ISSN: 1076-6332
Publisher: Elsevier Science, Inc.  
Date Published: 2013-08-01
Start Page: 1041
End Page: 1047
Language: English
DOI: 10.1016/j.acra.2013.04.005
PROVIDER: scopus
PUBMED: 23830610
PMCID: PMC4721569
DOI/URL:

http://www.scopus.com/inward/record.url?eid=2-s2.0-84880019476&partnerID=40&md5=e1f198da1d07078968ef6af752ddb979
Notes: "Export Date: 1 August 2013" - "CODEN: ARADF" - "Source: Scopus"
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MSK Authors
  1. Hedvig Hricak
    420 Hricak
  2. Yousef Mazaheri Tehrani
    71 Mazaheri Tehrani
  3. Hebert Alberto Vargas Alvarez
    267 Vargas Alvarez
  4. Oguz Akin
    264 Akin
  5. Charles Nyman
    6 Nyman
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