Design of a breast phantom for quantitative MRI

Area of Science:

• Medical Imaging
• Biophysics
• Biomaterials

Background:

• Quantitative magnetic resonance imaging (MRI) measurements of breast tissue properties like T1 relaxation time and apparent diffusion coefficient (ADC) require reliable phantoms for calibration and quality control.
• Standardization of these measurements is crucial for accurate diagnosis and monitoring of breast conditions.

Purpose of the Study:

• To develop and validate a novel breast phantom capable of quantitative assessment of T1 relaxation time and ADC values.
• To ensure the phantom's compatibility with clinical MRI systems and various breast coils.
• To establish a tool for long-term quality control in quantitative breast MRI.

Main Methods:

• A modular breast phantom was constructed with interchangeable units for T1/T2 relaxation and diffusion measurements.
• The T1 unit mimicked fibroglandular and fatty tissues using corn syrup and grapeseed oil.
• The diffusion unit utilized polyvinylpyrrolidone (PVP) solutions to modulate ADC values.
• The phantom was imaged on 1.5T and 3.0T MRI scanners with different breast coils.

Main Results:

• The fibroglandular mimic achieved target T1 values across different temperatures and field strengths.
• PVP solutions successfully mimicked a wide range of ADC values, from normal tissue to malignant tumors.
• Interchangeable units demonstrated consistent performance, allowing for assessment of variations.

Conclusions:

• The developed breast phantom effectively enables accurate T1 and ADC measurements.
• The phantom is compatible with various clinical breast coils, serving as a valuable quality control tool.
• This phantom facilitates the standardization of quantitative measurements in breast MRI.