Preoperative Grading of Astrocytic Supratentorial Brain Tumors with Diffusion-Weighted Magnetic Resonance Imaging and Apparent Diffusion Coefficient.

Background: Diffusion-weighted imaging (DWI) is a form of magnetic resonance imaging (MRI) based on measuring the random Brownian motion of water molecules within the biological tissues and is particularly useful in tumor characterization.

Objectives: The purpose of this study was to evaluate the diagnostic value of DW MRI and the apparent diffusion coefficient (ADC) for preoperative grading of astrocytic supratentorial brain tumors.

Patients And Methods: Twenty-three patients (14 females, 9 males, mean age 43 years) with astrocytic supratentorial brain tumors underwent preoperative conventional MR imaging and DW MRI.

Development of radiology in Iran.

Historically, stratification in medical profession has followed certain patterns pertinent to the nature of the work and the organ of interest. Evolution of radiology was, however, different insofar as it followed an accidental discovery toward the end of the 19th century. The physical properties of the discovered rays were to set the initial direction for future expansion of the discipline.