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Image artifacts on prostate diffusion-weighted magnetic resonance imaging: trade-offs at 1.5 Tesla and 3.0 Tesla
Yousef Mazaheri1, H Alberto Vargas, Gregory Nyman
1Department of Medical Physics, Memorial Sloan-Kettering Cancer Center, 1275 York Avenue, New York, NY, USA. mazahery@mskcc.org
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 1.5 T (1.5 T) and 3.0 T (3.0 T). 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 3.0 T endorectal DW-MRI and 53 consecutive men who underwent 1.5 T 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 3.0 T than at 1.5 T (P < .0001, all comparisons). Reader 2 (but not reader 1) found ghosting artifacts more often at 3.0 T (P = .001) and blurring more often at 1.5 T (P = .006). Mean SNR at the urethra (87.92 ± 27.76) at 3.0 T was 1.43 times higher than at 1.5 T (64.51 ± 14.96) (P < .0001).
Conclusions:
At 3.0 T (as compared to 1.5 T), increased SNR on prostate DW-MRI comes at the expense of geometric distortion and can also lead to more pronounced ghosting artifacts. Therefore, to take full advantage of the benefits of 3.0 T, further improvements in acquisition techniques are needed to address DW-MRI artifacts corresponding to higher field strengths.
Insights
Higher magnetic field strength (3.0 T) in prostate diffusion-weighted MRI (DW-MRI) increases signal-to-noise ratio but also introduces more artifacts like geometric distortion and ghosting compared to 1.5 T. Further technique improvements are needed for optimal 3.0 T imaging.
Area of Science:
- Radiology
- Medical Imaging
- Physics
Background:
- Prostate diffusion-weighted magnetic resonance imaging (DW-MRI) is crucial for cancer detection.
- Comparing imaging artifact prevalence and signal-to-noise ratios (SNRs) between 1.5 T and 3.0 T systems is essential for optimizing diagnostic quality.
Purpose of the Study:
- To identify and quantify artifacts in prostate DW-MRI at 1.5 T and 3.0 T.
- To compare the tradeoffs between these two field strengths.
- To provide quantitative SNR estimates for both field strengths.
Main Methods:
- Retrospective analysis of 106 endorectal DW-MRI scans (53 at 1.5 T, 53 at 3.0 T).
- Two blinded readers assessed artifacts including geometric distortion, signal graininess, ghosting, and blurring.
- SNR was measured on b=0 images using a reference region at the verumontanum.
Main Results:
- Significantly more geometric distortion and signal graininess were observed at 3.0 T compared to 1.5 T (P < .0001).
- Reader 2 noted more ghosting at 3.0 T (P = .001) and blurring at 1.5 T (P = .006).
- Mean SNR at the urethra was 1.43 times higher at 3.0 T (87.92 ± 27.76) than at 1.5 T (64.51 ± 14.96) (P < .0001).
Conclusions:
- Increased SNR at 3.0 T for prostate DW-MRI is accompanied by increased geometric distortion and potential for more ghosting artifacts.
- To leverage the benefits of 3.0 T, advancements in acquisition techniques are necessary to mitigate artifacts associated with higher field strengths.
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