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.
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.
Authors: Caroline M A Hoeks; Jelle O Barentsz; Thomas Hambrock; Derya Yakar; Diederik M Somford; Stijn W T P J Heijmink; Tom W J Scheenen; Pieter C Vos; Henkjan Huisman; Inge M van Oort; J Alfred Witjes; Arend Heerschap; Jurgen J Fütterer Journal: Radiology Date: 2011-10 Impact factor: 11.105
Authors: J J Brown; J R Duncan; J P Heiken; D M Balfe; A P Corr; S A Mirowitz; S S Eilenberg; J K Lee Journal: Radiology Date: 1991-11 Impact factor: 11.105
Authors: J H Gillard; N G Papadakis; K Martin; C J Price; E A Warburton; N M Antoun; C L Huang; T A Carpenter; J D Pickard Journal: Br J Radiol Date: 2001-07 Impact factor: 3.039
Authors: Elena A Kaye; Emily A Aherne; Cihan Duzgol; Ida Häggström; Erich Kobler; Yousef Mazaheri; Maggie M Fung; Zhigang Zhang; Ricardo Otazo; Hebert A Vargas; Oguz Akin Journal: Radiol Artif Intell Date: 2020-08-26
Authors: Pelin Aksit Ciris; Jr-Yuan George Chiou; Daniel I Glazer; Tzu-Cheng Chao; Clare M Tempany-Afdhal; Bruno Madore; Stephan E Maier Journal: Invest Radiol Date: 2019-04 Impact factor: 6.016
Authors: Jianmin Yuan; Yuxin Hu; Anne Menini; Christopher M Sandino; Jesse Sandberg; Vipul Sheth; Catherine J Moran; Marcus Alley; Michael Lustig; Brian Hargreaves; Shreyas Vasanawala Journal: Magn Reson Med Date: 2019-11-29 Impact factor: 4.668
Authors: Sidsel Damkjær; Jakob B Thomsen; Svetlana I Petersen; Jens Peter Bangsgaard; Peter M Petersen; Ivan R Vogelius; Marianne C Aznar Journal: Acta Oncol Date: 2017-03-15 Impact factor: 4.089
Authors: Mehmet Coskun; Sherif Mehralivand; Joanna H Shih; Maria J Merino; Bradford J Wood; Peter A Pinto; Tristan Barrett; Peter L Choyke; Baris Turkbey Journal: Abdom Radiol (NY) Date: 2020-12