b value mri

Materials and Methods Thirty-four consecutive patients with vertebral compression fractures underwent sagittal diffusion-weighted imaging DWI with different b values. Objective The objective was to explore the optimal b value in diffusion-weighted imaging DWI of MRI for differential diagnosis of benign and malignant vertebral fractures.

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Depending on the organ being imaged b-values typically range from 50-1000smm 2.

. Forty-two consecutive patients underwent multi b-value 16 evenly spaced b-values between 0 and 2000 smm 2 DWI along with multi-parametric MRI MP-MRI of the prostate at 3 Tesla followed by trans-rectal ultrasoundMRI fusion guided targeted biopsy of suspicious lesions detected at MP-MRI. In general approximately 1000 smm 2 is the maximal b value for DWI 5 11. The b factor summarizes the influence of the gradients on the diffusion weighted images.

Lesions were analyzed for benignitymalignity using apparent diffusion coefficient ADC values with 10 b-value combinations and by measuring the lesionnormal parenchyma ADC ratio. Studies have reported that the use of b values higher than 1000 smm 2 and 2000 smm 2 improves tumor localization and the contrast between benign and malignant lesions in the prostate and the breasts 12 14. The use of b values more than 1000 smm 2 would offer better contrast but was more liable to suffer susceptibility artifact.

Thus image sequences from low to high b-values must be read side by side in order to establish the precise anatomic location of the suspected tumor. B value measures the degree of diffusion weighting applied thereby indicating the amplitude G time of applied gradients δ and duration between the paired gradients Δ and is calculated as. The degree of diffusion weight in g correlates with the strength of the diffusion gradients characterized b y the b - value which is a function of the gradient related parameters.

The reason is readily apparent from the images below. Computed DWI images up to a simulated b-value of. Mike Notohamiprodjo Die Radiologie Munich Germany Optimization and Longterm Monitoring in Radiology Departments 14.

Some recent studies have proposed that imaging with very high b-values. Mean ADC values were approximately 13 1-15 higher in. Numerous studies have shown that restricted diffusion is the single most reliable predictor of cancer on multi-parametric MRI.

Large b factors should be chosen for more precise evaluation of ADC values of the tumor. Using lower b-values such as 0 and 50 together with higher b-values 600 smm2 was beneficial Az0928 and 0927. Vikas Gulani University of Michigan Ann Arbor MI USA Improving Productivity in MRI Clinical Experience in a Multi-site Outpatient Practice Setting 1.

There is no consensus on the optimal b-value. Either of these conditions lead to a higher signal loss for a given rate of diffusion in a region in the body. Suppose we acquire two images - one without applying these GMFs b 0 and then another with a certain b value eg b 1000.

The Value of MR Imaging. A b value of 8001000 smm 2 would provide an excellent spatial resolution and an adequate signalnoise ratio for lesion evaluation. Certa in illnesses show restrictions of diffusion for example demyel in ization and cytotoxic edema.

A baseline b-value of 50 smm² is often used in liver diffusion-weighted imaging instead of b 0. Generally the larger the b values used the lower the ADC values owing to the contribution of perfusion. At b 3000 smm 2 points from 1 to 3 were assigned to tumor signals the same as those observed at b 1000 smm 2 but 4 points were assigned to hyperintense signals between those of the normal subcortical white matter and the corticospinal tract and 5 to markedly hyperintense signals that were equal to or higher than that of the normal.

Modern scanners usually allow a range of 0-4000smm 2. Our purpose was to evaluate the appearance of the normal brain on DW MR images as the diffusion gradient strength b value is increased from 1000 to 3000 smm2. MRI Resources MR Myelography - Diffusion Weighted Imaging - DICOM - Calculation - Universities - Contrast Agents B-Value The b-value is a factor of diffusion weighted sequences.

As MR scanner hardware has improved allowing for increased gradient strengths we are able to generate higher b values for diffusion-weighted DW imaging. Routine abdominal MRI and DWI were performed using seven b-values 0 50 200 400 600 800 1000 smm 2. Mean ADC values were significantly different between malignant and benign lesions for all b-value combinations P0000.

The higher the value b the stronger the diffusion weighting. Therefore a larger b value is achieved by increasing the gradient amplitude and duration and by widening the interval between paired gradient pulses. The best b-value combination was 0 and 800 Az0935.

Diffusion-weighted images are obtained by acquiring T2-weighted images with the addition of diffusion weighting gradient known as the b value. With b 0 bright signals are noted in multiple veins due to the high T2 of blood coupled with sluggish flow. Strength duration and the period b etween diffusion gradients.

A higher b value would mean that the GMFs are either applied for longer or that their magnitude is higher.

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