Investigative radiology
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Investigative radiology · Jun 2007
Comparative StudyLung MRI at 1.5 and 3 Tesla: observer preference study and lesion contrast using five different pulse sequences.
To compare the image quality and lesion contrast of lung MRI using 5 different pulse sequences at 1.5 T and 3 T. ⋯ The imaging characteristics of different pulse sequences used for lung MRI do not substantially differ between 1.5 T and 3 T. A higher lesion contrast can be expected at 3 T.
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Investigative radiology · Jun 2007
Hyperpolarized 3He ventilation defects and apparent diffusion coefficients in chronic obstructive pulmonary disease: preliminary results at 3.0 Tesla.
Hyperpolarized 3He magnetic resonance imaging (3He MRI) at 3.0 Tesla of healthy volunteers and chronic obstructive pulmonary disease (COPD) patients was performed for quantitative evaluation of ventilation defects and apparent diffusion coefficients (ADC) and for comparison to published results acquired at 1.5 Tesla. The reproducibility of 3He ADC and ventilation defects was also assessed in subjects scanned 3 times, twice within 10 minutes, and again within 7 +/- 2 days of the first MRI visit. ⋯ ADC values for emphysematous lungs were significantly increased compared with healthy lungs in age-matched subjects, and all values were comparable to those reported previously at 1.5 Tesla. Ventilation defect score and ventilation defect volume results were also comparable to results previously reported in COPD subjects Reproducibility of ADC for same-day scan-rescan and 7-day rescan was high and similar to previously reported results.
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Investigative radiology · Jun 2007
Comparative StudyIntraindividual comparison of MR-renal perfusion imaging at 1.5 T and 3.0 T.
The purpose of this study was to intraindividually compare fast gradient-echo semiquantitative renal perfusion measurements at 1.5 Tesla (T) and 3.0 Tesla. ⋯ Renal perfusion measurements at 3.0 T are feasible and directly benefit from the inherently higher SNR at 3.0 T. The higher SNR also translates into an increased SMax, whereas MTT and TTP are independent of the field strength.
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Investigative radiology · Jun 2007
Reproducibility of quantitative cerebral T2 relaxometry, diffusion tensor imaging, and 1H magnetic resonance spectroscopy at 3.0 Tesla.
The reproducibility of quantitative cerebral T2 relaxometry, diffusion tensor imaging, and H magnetic resonance (MR) spectroscopic imaging was assessed on a clinical 3.0 T MR system. ⋯ The reproducibility of quantitative brain MRI at 3.0 T is better than or at least comparable to the reproducibility at 1.5 T.
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Investigative radiology · Jun 2007
High-resolution magnetic resonance imaging of the temporomandibular joint: image quality at 1.5 and 3.0 Tesla in volunteers.
To assess the image quality of a high-resolution imaging protocol for the temporomandibular joint (TMJ) at 3.0 T and to compare it with our standard 1.5 T protocol. ⋯ Depiction of the normal anatomy of the TMJ benefits significantly when investing the higher SNR at 3.0 T into better spatial resolution. We anticipate that this advantage of 3.0 T MRI will also permit a more detailed analysis of capsular and disk pathology.