scholarly journals Conspicuity of Peripheral Zone Prostate Cancer on Computed Diffusion-Weighted Imaging: Comparison of cDWI1500, cDWI2000, and cDWI3000

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Metin Vural ◽  
Gökhan Ertaş ◽  
Aslıhan Onay ◽  
Ömer Acar ◽  
Tarık Esen ◽  
...  
Keyword(s):  
Diffusion Weighted Imaging ◽  
Contrast Ratio ◽  
Peripheral Zone ◽  
Lesion Detection ◽  
Prostate Tissue ◽  
Detection Rates ◽  
Diffusion Weighted ◽  
Image Set ◽  
Average Contrast ◽  
Lesion Conspicuity

Introduction and Objective. Disadvantages associated with direct highb-value measurements may be avoided with use of computed diffusion-weighted imaging (cDWI). The purpose of this study is to assess the diagnostic performance of cDWI image sets calculated for highb-values of 1500, 2000, and 3000 s/mm2.Materials and Methods. Twenty-eight patients who underwent multiparametric MRI of the prostate and radical prostatectomy consecutively were enrolled in this retrospective study. Using a software developed at our institute, cDWI1500, cDWI2000, and cDWI3000image sets were generated by fitting a monoexponential model. Index lesions on cDWI image sets were scored by two radiologists in consensus considering lesion conspicuity, suppression of background prostate tissue, distortion, image set preferability, and contrast ratio measurements were performed.Results. Lesion detection rates are the same for computedb-values of 2000 and 3000 s/mm2and are better thanb-values of 1500 s/mm2. Best lesion conspicuity and best background prostate tissue suppression are provided by cDWI3000image set. cDWI2000image set provides the best zonal anatomical delineation and less distortion and was chosen as the most preferred image set. Average contrast ratio measured on these image sets shows almost a linear relation with theb-values. Conclusion. cDWI2000image set with similar conspicuity and the same lesion detection rate, but better zonal anatomical delineation, and less distortion, was chosen as the preferable image set.

Diffusion-weighted MRI of ischemic stroke at 3T: Value of synthetic b-values

2021 ◽  
Vol 94 (1121) ◽  
pp. 20200869
Author(s):  
Thomas Sartoretti ◽  
Elisabeth Sartoretti ◽  
Michael Wyss ◽  
Manoj Mannil ◽  
Luuk van Smoorenburg ◽  
...  
Keyword(s):  
Ischemic Stroke ◽  
Image Quality ◽  
Detection Rate ◽  
Contrast Ratio ◽  
B Value ◽  
Lesion Detection ◽  
B Values ◽  
Diffusion Weighted ◽  
Synthetic Images ◽  
Lesion Conspicuity

Objectives: Diffusion-weighted imaging (DWI) plays a crucial role in the diagnosis of ischemic stroke. We assessed the value of computed and acquired high b-value DWI in comparison with conventional b = 1000 s mm−2 DWI for ischemic stroke at 3T. Methods: We included 36 patients with acute ischemic stroke who presented with diffusion abnormalities on DWI performed within 24 h of symptom onset. B-values of 0, 500, 1000 and 2000 s mm−2 were acquired. Synthetic images with b-values of 1000, 1500, 2000 and 2500 s mm−2 were computed. Two readers compared synthetic (syn) and acquired (acq) b = 2000 s mm−2 images with acquired b = 1000 s mm−2 images in terms of lesion detection rate, image quality, presence of uncertain hyperintensities and lesion conspicuity. Readers also selected their preferred b-value. Contrast ratio (CR) measurements were performed. Non-parametrical statistical tests and weighted Cohens’ κ tests were computed. Results: Syn1000 and syn1500 matched acq1000 images in terms of lesion detection rate, image quality and presence of uncertain hyperintensities but presented with significantly improved lesion conspicuity (p < 0.01) and were frequently selected as preferred b-values. Acq2000 images exhibited a similar lesion detection rate and improved lesion conspicuity (p < 0.01) but worse image quality (p < 0.01) than acq1000 images. Syn2000 and syn2500 images performed significantly worse (p < 0.01) than acq1000 images in most or all categories. CR significantly increased with increasing b-values. Conclusion: Synthetic images at b = 1000 and 1500 s mm−2 and acquired DWI images at b = 2000 s mm−2 may be of clinical value due to improved lesion conspicuity. Advances in knowledge: Synthetic b-values enable improved lesion conspicuity for DWI of ischemic stroke.

scholarly journals Evaluation of fitting models for prostate tissue characterization using extended‐range b‐factor diffusion‐weighted imaging

2017 ◽  
Vol 79 (4) ◽  
pp. 2346-2358 ◽  
Author(s):  
Fredrik Langkilde ◽  
Thiele Kobus ◽  
Andriy Fedorov ◽  
Ruth Dunne ◽  
Clare Tempany ◽  
...  
Keyword(s):  
Diffusion Weighted Imaging ◽  
Tissue Characterization ◽  
Prostate Tissue ◽  
Diffusion Weighted ◽  
Extended Range

scholarly journals Diffusion-weighted imaging of normal and malignant prostate tissue at 3.0T

2006 ◽  
Vol 23 (2) ◽  
pp. 130-134 ◽  
Author(s):  
Martin D. Pickles ◽  
Peter Gibbs ◽  
Muthyala Sreenivas ◽  
Lindsay W. Turnbull
Keyword(s):  
Diffusion Weighted Imaging ◽  
Prostate Tissue ◽  
Diffusion Weighted ◽  
Malignant Prostate

Hidden Infarcts Detected by a High b-Value Diffusion-Weighted Imaging: A Parameter-Optimized Study

2019 ◽  
Vol 9 (2) ◽  
pp. 308-313
Author(s):  
Xiubao Song ◽  
Xi Xu ◽  
Yufeng Ye ◽  
Jianye Liang ◽  
Mengjie Ma ◽  
...  
Keyword(s):  
Cerebral Infarction ◽  
Diffusion Weighted Imaging ◽  
Contrast Ratio ◽  
B Value ◽  
Acute Cerebral Infarction ◽  
Matrix Size ◽  
Diffusion Weighted ◽  
The Matrix ◽  
Adc Values ◽  
Noise Ratio

Objective: Small infarcts are easily missed on conventional sequences or a standard b-value diffusion-weighted imaging (DWI). This study aims to investigate the signal characteristics of DWI with different b-values and matrixes in acute cerebral infarction, and evaluate the feasibility of high b-values used in DWI. Methods: Twenty-nine cases of clinically diagnosed acute cerebral infarction were included prospectively in this study. The patients underwent MRI examinations, including routine T1WI, T2WI, T2 Flair, and different b-value DWIs (b = 1000, 1500, and 2000 s/mm2 with matrix 160 × 160. In addition, b = 1000 DWI was divided into two groups with different matrixes of 128 × 128 and 160 × 160. The differences of the signal-to-noise ratio (SNR), contrast-to-noise ratio (CNR), contrast ratio (CR), and apparent diffusion coefficient (ADC) values between the different b-values and matrixes DWI were compared. Results: Visually, b =1500 and b = 2000 DWI showed more scattering and micro-lesions than a standard DWI. The lesions shown in the high b-value DWI were more conspicuous and brighter. Quantitatively, with the increase in b-values, the SNR, CNR, and ADC values decreased gradually, but the CR increased gradually. With a reduction in the matrix size, the SNR and CNR improved (all the results were statistically significant with good inter-observer reliability). Conclusions: A high b-value for DWI is beneficial for the detection of micro- and hyperacute infarction, but the image quality declines. However, reducing the matrix size appropriately could make up for this deficiency.

Sign in / Sign up

Export Citation Format

Share Document