Functional magnetic resonance of human breast tumors: diffusion and perfusion imaging
1Department of Radiological Sciences, University of California at Los Angeles, 90015-1721, USA. ssinha@mednet.ucla.edu
Abstract:
This review is focused on two relatively new developments in magnetic resonance imaging (MRI) and their application to breast lesion characterization: diffusion and perfusion MRI. Diffusion MRI measures the mobility of the water protons and thus provides a window to tissue microstructure. Perfusion MRI measures the rate at which blood is delivered to tissue and thus provides information about microvasculature. Because both tissue structure and vasculature are likely to change in disease states, measurement of diffusion and perfusion may have direct physiologic relevance. This review covers topics related to the imaging sequences, image analysis, and clinical studies for diffusion and perfusion breast MRI. Preliminary studies show that the apparent diffusion coefficient (ADC) is a marker of cell density and can distinguish malignant from benign lesions. Perfusion MR also shows promise for breast tumor characterization: malignant tumors have consistently higher relative tissue blood volumes (rTBV) than normal and benign tumors. Additional research is required with large patient cohorts to establish these two techniques on a clinical footing.
Insights
Diffusion and perfusion MRI are new techniques for breast lesion characterization. These methods show promise in distinguishing malignant from benign tumors by assessing tissue microstructure and blood flow.
Area of Science:
- Radiology
- Medical Imaging
- Oncology
Background:
- Magnetic Resonance Imaging (MRI) is a key diagnostic tool.
- Diffusion MRI assesses water proton mobility, reflecting tissue microstructure.
- Perfusion MRI evaluates blood delivery rate, indicating microvasculature status.
Purpose of the Study:
- To review diffusion and perfusion MRI techniques for breast lesion characterization.
- To explore their application in distinguishing malignant from benign breast tumors.
- To summarize imaging sequences, analysis methods, and clinical findings.
Main Methods:
- Review of current literature on diffusion and perfusion breast MRI.
- Analysis of imaging sequences and data processing techniques.
- Evaluation of clinical studies investigating lesion characterization.
Main Results:
- Diffusion MRI's apparent diffusion coefficient (ADC) correlates with cell density, aiding differentiation of malignant from benign lesions.
- Perfusion MRI reveals higher relative tissue blood volumes (rTBV) in malignant tumors compared to benign ones.
- Both techniques show potential for non-invasive breast tumor assessment.
Conclusions:
- Diffusion and perfusion MRI are promising advanced techniques for breast lesion characterization.
- Further large-scale clinical studies are needed to establish these methods for routine clinical use.
- These MRI techniques offer insights into tissue physiology relevant to disease states.
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