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Available radiologic glossaries include the following: ▪ Thoracic radiology: “Glossary of Terms for Thoracic Radiology” ▪ Computed tomography of the lung: “Glossary of Terms for CT of the Lungs” ▪ Breast imaging: BI-RADS Atlas ▪ Magnetic resonance: ACR Glossary of MRI Terms, Glossary of Magnetic Resonance Terms ▪ Ultrasonography: Recommended Ultrasound Terminology ▪ General, for laypersons and nonspecialists: RadiologyInfo In addition to the terminology explained in this section, see , Correct and Preferred Usage of Common Words and Phrases, for terms such as radiography, radiology, radiograph, and film; , Abbreviations, Radioactive Isotopes, and , Isotopes; and , Units of Measure, Less

The following terms are commonly used in radiology. b value The b factor or b value is associated with diffusion-weighted magnetic resonance imaging (diffusion-weighted MRI or DWI). It measures “strength (intensity and timing) of the diffusion gradient”; units are seconds per square millimeter.maximum b value of 1221 s/mm2 Four gradient strengths were applied, resulting in b values of 0 and 1000 s/mm2 applied sequentially in the X, Y, and Z gradient directions. Doppler See , Cardiology, Echocardiography. echo train A sequence of echoes. “Echo train is not a unit of measure” but is expressed as in these examples: echo train Less