The influence of diffusion- and relaxation-related factors on signal intensity: an introductive guide to magnetic resonance diffusion-weighted imaging studies.
In magnetic resonance diffusion-weighted imaging, signal intensity is influenced simultaneously by temperature, diffusivity, b value, pseudodiffusion, macroscopic motion, and T2-weighted intensity value. The purpose of this pictorial essay is to discuss and exemplify the influence that such factors and the related modifications have on signal intensity. Apparent diffusion coefficient, shine-through and pseudodiffusion will also be examined to show how T2-weighted signal intensity value and nondiffusional intravoxel incoherent motion can affect the diffusion-weighted imaging.
Department of Clinical Physiopathology, Section of Radiodiagnostics, University of Florence, Azienda Ospedaliero-Universitaria Careggi, Viale Morgagni 85, Florence, Italy. stefano.colagrande@unifi.it
Stefano
S
Colagrande
Giacomo
G
Belli
Letterio Salvatore
LS
Politi
Lorenzo
L
Mannelli
Filippo
F
Pasquinelli
Natale
N
Villari
D000368:Aged; D000369:Aged, 80 and over; D004058:Diffusion; D038524:Diffusion Magnetic Resonance Imaging; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged