On the effect of reference and sample volume on magnetic particle imaging quantification

Area of Science:

• Biomedical imaging
• Medical physics
• Nanotechnology

Background:

• Magnetic particle imaging (MPI) quantifies superparamagnetic iron oxide nanoparticle (SPION) tracers non-invasively.
• Concerns exist regarding MPI quantification accuracy influenced by tracer distribution volume.

Purpose of the Study:

• To evaluate the impact of relative reference and object sample volumes on MPI quantification accuracy.
• To investigate the influence of tracer concentration and partial volume effects on MPI measurements.

Main Methods:

• A constant mass dilution series of Ferucarbotran tracer was used.
• MPI images were acquired under various scan modes and segmented using two methods.
• Iron mass was quantified relative to reference samples of differing volumes.

Main Results:

• Tracer concentration affected signal distribution and iron estimation accuracy.
• Reference samples with volumes similar to the region of interest yielded the most accurate quantification.
• Partial volume effects, due to finite MPI resolution, were identified as a key factor.

Conclusions:

• Careful selection of reference sample volume relative to test sample volume is critical for accurate quantitative MPI.
• Understanding partial volume effects is essential for improving MPI quantification in biomedical applications.