Fat Suppressed Contrast-Enhanced T1-Weighted Dynamic Magnetic Resonance Imaging at 3T: Comparison of Image Quality Between Spectrally Adiabatic Iversion Recovery and the Multiecho Dixon Technique in Imaging of the Prostate

Iyama, Yuji; Nakaura, Takeshi; Kidoh, Masafumi; Katahira, Kentaro; Namimoto, Tomohiro; Morishita, Shoji; Yamashita, Yasuyuki

doi:10.1097/rct.0000000000000540

Cited by 4 publications

(2 citation statements)

References 33 publications

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“…Our reported SNR for all methods are within the reported and recommended values of >15 for Dixon images, >10 for T2 relaxation times and > 20 for diffusion . Possible bias of the parameters at these SNR levels was estimated by simulations and is minimal (see the supporting information for data).…”

Section: Discussionsupporting

confidence: 76%

Multi‐center evaluation of stability and reproducibility of quantitative MRI measures in healthy calf muscles

et al. 2019

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The purpose of this study was to evaluate temporal stability, multi‐center reproducibility and the influence of covariates on a multimodal MR protocol for quantitative muscle imaging and to facilitate its use as a standardized protocol for evaluation of pathology in skeletal muscle. Quantitative T2, quantitative diffusion and four‐point Dixon acquisitions of the calf muscles of both legs were repeated within one hour. Sixty‐five healthy volunteers (31 females) were included in one of eight 3‐T MR systems. Five traveling subjects were examined in six MR scanners. Average values over all slices of water‐T2 relaxation time, proton density fat fraction (PDFF) and diffusion metrics were determined for seven muscles. Temporal stability was tested with repeated measured ANOVA and two‐way random intraclass correlation coefficient (ICC). Multi‐center reproducibility of traveling volunteers was assessed by a two‐way mixed ICC. The factors age, body mass index, gender and muscle were tested for covariance. ICCs of temporal stability were between 0.963 and 0.999 for all parameters. Water‐T2 relaxation decreased significantly (P < 10−3) within one hour by ~ 1 ms. Multi‐center reproducibility showed ICCs within 0.879–0.917 with the lowest ICC for mean diffusivity. Different muscles showed the highest covariance, explaining 20–40% of variance for observed parameters. Standardized acquisition and processing of quantitative muscle MRI data resulted in high comparability among centers. The imaging protocol exhibited high temporal stability over one hour except for water T2 relaxation times. These results show that data pooling is feasible and enables assembling data from patients with neuromuscular diseases, paving the way towards larger studies of rare muscle disorders.

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Section: Discussionsupporting

confidence: 76%

Multi‐center evaluation of stability and reproducibility of quantitative MRI measures in healthy calf muscles

et al. 2019

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“…Commonly employed fat suppression techniques encompass the Short T1 Inversion Recovery Sequence (STIR), Spectral Presaturation with Inversion Recovery (SPIR), and Dixon’s technique (Phase Contrast Method, Water-Fat Separation Imaging). Notably, the multipoint Dixon technique offers superior image quality and uniform fat suppression within a shorter scan duration when compared to STIR and spectral presaturation with inversion recovery gadolinium-T1WI techniques ( 25 , 26 ). Flex technology represents a refined iteration of fat-suppressed imaging, building upon Dixon’s water-lipid separation methodology.…”

Section: Discussionmentioning

confidence: 99%

The application value of LAVA-flex sequences in enhanced MRI scans of nasopharyngeal carcinoma: comparison with T1WI-IDEAL

Peng,

Chen,

et al. 2024

Front. Oncol.

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IntroductionMagnetic resonance imaging (MRI) staging scans are critical for the diagnosis and treatment of patients with nasopharyngeal cancer (NPC). We aimed to evaluate the application value of LAVA-Flex and T1WI-IDEAL sequences in MRI staging scans.MethodsEighty-four newly diagnosed NPC patients underwent both LAVA-Flex and T1WI-IDEAL sequences during MRI examinations. Two radiologists independently scored the acquisitions of image quality, fat suppression quality, artifacts, vascular and nerve display. The obtained scores were compared using the Wilcoxon signed rank test. According to the signal intensity (SI) measurements, the uniformity of fat suppression, contrast between tumor lesions and subcutaneous fat tissue, and signal-to-noise ratio (SNR) were compared by the paired t-test.ResultsCompared to the T1WI-IDEAL sequence, LAVA-Flex exhibited fewer artifacts (P<0.05), better visualization of nerves and vessels (P<0.05), and performed superior in the fat contrast ratio of the primary lesion and metastatic lymph nodes (0.80 vs. 0.52, 0.81 vs. 0.56, separately, P<0.001). There was no statistically significant difference in overall image quality, tumor signal-to-noise ratio (SNR), muscle SNR, and the detection rate of lesions between the two sequences (P>0.05). T1WI-IDEAL was superior to LAVA-Flex in the evaluation of fat suppression uniformity (P<0.05).DiscussionLAVA-Flex sequence provides satisfactory image quality and better visualization of nerves and vessels for NPC with shorter scanning times.

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Prostate MRI quality: a critical review of the last 5 years and the role of the PI-QUAL score

Giganti

Kasivisvanathan

Kirkham

et al. 2021

The British Journal of Radiology

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There is increasing interest in the use of multiparametric magnetic resonance imaging (mpMRI) in the prostate cancer pathway. The European Association of Urology (EAU) and the British Association of Urological Surgeons (BAUS) now advise mpMRI prior to biopsy, and the Prostate Imaging Reporting and Data System (PI-RADS) recommendations set out the minimal technical requirements for the acquisition of mpMRI of the prostate. The widespread and swift adoption of this technique has led to variability in image quality. Suboptimal image acquisition reduces the sensitivity and specificity of mpMRI for the detection and staging of clinically significant prostate cancer. This critical review outlines the studies aimed at improving prostate MR quality that have been published over the last 5 years. These span from the use of specific MR sequences, magnets and coils to patient preparation. The rates of adherence of prostate mpMRI to technical standards in different cohorts across the world are also discussed. Finally, we discuss the first standardised scoring system (i.e., Prostate Imaging Quality, PI-QUAL) that has been created to evaluate image quality, although further iterations of this score are expected in the future.

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Fat Suppressed Contrast-Enhanced T1-Weighted Dynamic Magnetic Resonance Imaging at 3T: Comparison of Image Quality Between Spectrally Adiabatic Iversion Recovery and the Multiecho Dixon Technique in Imaging of the Prostate

Cited by 4 publications

References 33 publications

Multi‐center evaluation of stability and reproducibility of quantitative MRI measures in healthy calf muscles

Multi‐center evaluation of stability and reproducibility of quantitative MRI measures in healthy calf muscles

The application value of LAVA-flex sequences in enhanced MRI scans of nasopharyngeal carcinoma: comparison with T1WI-IDEAL

Prostate MRI quality: a critical review of the last 5 years and the role of the PI-QUAL score

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