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Whole body MRI: improved lesion detection and characterization with diffusion weighted techniques.

Attariwala R, Picker W - J Magn Reson Imaging (2013)

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.

View Article: PubMed Central - PubMed

Affiliation: AIM Medical Imaging, Vancouver, BC, Canada. attariwala@gmail.com

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Axial b-500 image (a) demonstrates loss of signal within the left aspect of the liver from cardiac pulsation. The anatomy is not obscured on the axial T2 (b) image. This loss of signal is less problematic at low b-values and can be practically minimized by increasing the number of averages for DWI, or cardiac gating.
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fig09: Axial b-500 image (a) demonstrates loss of signal within the left aspect of the liver from cardiac pulsation. The anatomy is not obscured on the axial T2 (b) image. This loss of signal is less problematic at low b-values and can be practically minimized by increasing the number of averages for DWI, or cardiac gating.

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.


Whole body MRI: improved lesion detection and characterization with diffusion weighted techniques.

Attariwala R, Picker W - J Magn Reson Imaging (2013)

Axial b-500 image (a) demonstrates loss of signal within the left aspect of the liver from cardiac pulsation. The anatomy is not obscured on the axial T2 (b) image. This loss of signal is less problematic at low b-values and can be practically minimized by increasing the number of averages for DWI, or cardiac gating.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3795449&req=5

fig09: Axial b-500 image (a) demonstrates loss of signal within the left aspect of the liver from cardiac pulsation. The anatomy is not obscured on the axial T2 (b) image. This loss of signal is less problematic at low b-values and can be practically minimized by increasing the number of averages for DWI, or cardiac gating.
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.

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.

View Article: PubMed Central - PubMed

Affiliation: AIM Medical Imaging, Vancouver, BC, Canada. attariwala@gmail.com

Show MeSH
Related in: MedlinePlus