Abstract
MRI is an attractive imaging modality in oncology owing to its lack of ionising radiation and exquisite soft tissue contrast. While conventional MRI provides invaluable morphological information, it gives little functional information. Diffusion-weighted MRI (DW-MRI) derives its contrast from the movement of water molecules in the tissue microenvironment and thus provides an insight into tissue cellularity and architecture.
Einstein formalised the mathematical description of Brownian motion in 1905, but it was not until 1965 that water diffusion in nuclear magnetic resonance (NMR) was studied and described by Stejskal and Tanner. It took another 20 years for DW-MRI to be employed clinically. Among the first clinical application, DW-MRI was used to evaluate ischaemic stroke. Its utility soon broadened to include brain tumours, and the technological advances in the last decade have enabled its use in extracranial malignancies. DW-MRI is quick to perform and non-invasive and can be applied for lesion detection, disease characterisation and assessment of treatment response. Quantitative measurements derived from DW-MRI are potential imaging biomarkers to predict likelihood of treatment response and prognosis in oncology.
In this chapter, we will review the principles of DW-MR imaging, its technical considerations, image interpretation and its broad application in oncology. Discussions related to DW-MRI in specific diseases will be reviewed in subsequent chapters.
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Abbreviations
- ADC:
-
Apparent diffusion coefficient
- AP:
-
Anterior-posterior
- CT:
-
Computed tomography
- D :
-
Tissue diffusivity
- D*:
-
Pseudodiffusion coefficient
- DDC:
-
Distributed diffusion coefficient
- DWIBS:
-
Diffusion weighted imaging with body signal suppression
- DW-MRI:
-
Diffusion weighted MRI
- EPI:
-
Echo-planar imaging
- 18F:
-
18Fluorine
- FDG:
-
Fluoro-2-deoxy-d-glucose
- fDM:
-
Functional diffusion map
- f V :
-
Fractional volume of flowing water molecules within the capillaries
- GRAPPA:
-
Generalized Autocalibrating Partially Parallel Acquisition
- IR:
-
Inversion recovery
- IVIM:
-
Intravoxel incoherent motion
- MPG:
-
Motion probing gradients
- PET:
-
Positron emission tomography
- ROI:
-
Region of interest
- SENSE:
-
Sensitivity encoding
- SNR:
-
Signal-to-noise ratio
- SPAIR:
-
Spectral attenuated inversion recovery
- TR:
-
Repetition time
- α :
-
Stretching parameter
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Acknowledgements
The authors would like to thank Mr. David J. Collins (Institute of Cancer Research, London) for his insight and helpful comments on the physics and technical aspect of this chapter.
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Tam, H.H., Koh, DM. (2014). Diffusion-Weighted MR Imaging. In: Luna, A., Vilanova, J., Hygino da Cruz Jr., L., Rossi, S. (eds) Functional Imaging in Oncology. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-40412-2_14
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