BWerte

bWerte, also written b-Werte or b-values in German-language sources, is a term used to denote a set of parameter values labeled with the letter b. There is no single universal definition; the precise meaning depends on the field and notation. In general, b-values are scalar quantities that parameterize a model or measurement and help distinguish weighting, effect sizes, or baselines.

In diffusion-weighted magnetic resonance imaging (diffusion MRI), the b-value quantifies diffusion weighting. It is expressed in s/mm^2. A b=0 image (b0) has no diffusion weighting. Common values include 500–1000 and 1500–3000 s/mm^2, with higher values providing stronger diffusion contrast. Diffusion metrics such as the apparent diffusion coefficient (ADC) rely on data acquired at multiple b-values.

In statistical modeling, b-values often denote regression coefficients or slopes for predictors. They reflect the magnitude of a predictor’s effect on the outcome and are estimated from data; they differ from standardized coefficients (beta) in scaling and interpretation.

In metrology and quality control, b-values may denote thresholds, baselines, or acceptance limits used to classify measurements, set calibration points, or determine pass/fail criteria. Their exact definition depends on the standard or protocol being applied.

Because the term is generic, researchers should consult the specific field’s notation to interpret a given b-value. Clear context is essential to avoid ambiguity when encountering bWerte in technical literature.