Practical medical applications of quantitative MR relaxometry

Area of Science:

• Medical Imaging
• Biophysics
• Radiology

Background:

• Conventional MRI lacks quantitative metrics, hindering cross-subject and longitudinal comparisons.
• Signal intensity in standard MR images is influenced by hardware and software, limiting absolute interpretation.
• A need exists for quantitative MRI methods independent of scanner parameters.

Purpose of the Study:

• To provide an overview of quantitative relaxometry applications in clinical settings.
• To describe methods and challenges in acquiring accurate quantitative MR maps.
• To highlight the potential of quantitative relaxometry as a noninvasive diagnostic tool.

Main Methods:

• Quantitative relaxometry isolates individual MR contrast mechanisms (T1, T2, T2*).
• This process generates MR maps with physical interpretations, often in absolute units.
• Methods focus on acquiring precise and accurate quantitative MR maps.

Main Results:

• Quantitative relaxometry provides unbiased metrics for comparing MR scans.
• MR maps derived from quantitative relaxometry correlate with physiological parameters.
• Case studies demonstrate applications in multiple sclerosis, liver iron quantification, and acute myocardial infarction.

Conclusions:

• Quantitative relaxometry offers a standardized, hardware-independent approach to MRI analysis.
• It serves as a noninvasive surrogate for biopsy and histology by linking MR maps to physiology.
• This technique holds significant promise for advancing diagnostic capabilities in various clinical fields.