Whole body MRI: improved lesion detection and characterization with diffusion weighted techniques.
Bottom Line: Theory, b-value selection, common artifacts and target to background for optimized viewing will be reviewed for applications in the neck, chest, abdomen, and pelvis.DWI, when used in conjunction with routine imaging, can assist in detecting hemorrhagic degradation products, infection/abscess, and inflammation in colitis, while aiding with discrimination of free fluid and empyema, while limiting the need for intravenous contrast.DWI in conjunction with routine anatomic images provides a platform to improve lesion detection and characterization with findings rivaling other combined anatomic and functional imaging techniques, with the added benefit of no ionizing radiation.
Affiliation: AIM Medical Imaging, Vancouver, BC, Canada. firstname.lastname@example.orgShow MeSH
Related in: MedlinePlus
Mentions: Like all free-breathing techniques, whole-body DWIBS suffers near the diaphragm, particularly in the left lobe of the liver where cardiac pulsation results in signal loss as shown in Figure 9. This loss of signal can be minimized by cardiac and/or respiratory gating, and lower b-values. However, for whole-body DWIBS, quiet breathing is preferred to gating techniques to minimize scan time thus maximizing patient comfort. This free-breathing technique has been shown by Takahara et al to result in minimal signal loss 12.
Affiliation: AIM Medical Imaging, Vancouver, BC, Canada. email@example.com